mirror of
git://jb55.com/damus
synced 2024-09-05 21:03:51 +00:00
Since we can't mutate NdbNotes, let's update the existing codebase to generate and sign ids on NostrEvent constructions. This will allow us to match NdbNote's constructor
910 lines
42 KiB
C
910 lines
42 KiB
C
#ifndef SECP256K1_H
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#define SECP256K1_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stddef.h>
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/** Unless explicitly stated all pointer arguments must not be NULL.
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*
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* The following rules specify the order of arguments in API calls:
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*
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* 1. Context pointers go first, followed by output arguments, combined
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* output/input arguments, and finally input-only arguments.
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* 2. Array lengths always immediately follow the argument whose length
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* they describe, even if this violates rule 1.
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* 3. Within the OUT/OUTIN/IN groups, pointers to data that is typically generated
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* later go first. This means: signatures, public nonces, secret nonces,
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* messages, public keys, secret keys, tweaks.
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* 4. Arguments that are not data pointers go last, from more complex to less
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* complex: function pointers, algorithm names, messages, void pointers,
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* counts, flags, booleans.
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* 5. Opaque data pointers follow the function pointer they are to be passed to.
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*/
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/** Opaque data structure that holds context information
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*
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* The primary purpose of context objects is to store randomization data for
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* enhanced protection against side-channel leakage. This protection is only
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* effective if the context is randomized after its creation. See
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* secp256k1_context_create for creation of contexts and
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* secp256k1_context_randomize for randomization.
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*
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* A secondary purpose of context objects is to store pointers to callback
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* functions that the library will call when certain error states arise. See
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* secp256k1_context_set_error_callback as well as
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* secp256k1_context_set_illegal_callback for details. Future library versions
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* may use context objects for additional purposes.
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*
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* A constructed context can safely be used from multiple threads
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* simultaneously, but API calls that take a non-const pointer to a context
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* need exclusive access to it. In particular this is the case for
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* secp256k1_context_destroy, secp256k1_context_preallocated_destroy,
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* and secp256k1_context_randomize.
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*
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* Regarding randomization, either do it once at creation time (in which case
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* you do not need any locking for the other calls), or use a read-write lock.
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*/
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typedef struct secp256k1_context_struct secp256k1_context;
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/** Opaque data structure that holds rewritable "scratch space"
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*
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* The purpose of this structure is to replace dynamic memory allocations,
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* because we target architectures where this may not be available. It is
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* essentially a resizable (within specified parameters) block of bytes,
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* which is initially created either by memory allocation or TODO as a pointer
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* into some fixed rewritable space.
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*
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* Unlike the context object, this cannot safely be shared between threads
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* without additional synchronization logic.
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*/
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typedef struct secp256k1_scratch_space_struct secp256k1_scratch_space;
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/** Opaque data structure that holds a parsed and valid public key.
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*
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* The exact representation of data inside is implementation defined and not
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* guaranteed to be portable between different platforms or versions. It is
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* however guaranteed to be 64 bytes in size, and can be safely copied/moved.
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* If you need to convert to a format suitable for storage or transmission,
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* use secp256k1_ec_pubkey_serialize and secp256k1_ec_pubkey_parse. To
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* compare keys, use secp256k1_ec_pubkey_cmp.
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*/
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typedef struct {
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unsigned char data[64];
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} secp256k1_pubkey;
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/** Opaque data structured that holds a parsed ECDSA signature.
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*
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* The exact representation of data inside is implementation defined and not
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* guaranteed to be portable between different platforms or versions. It is
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* however guaranteed to be 64 bytes in size, and can be safely copied/moved.
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* If you need to convert to a format suitable for storage, transmission, or
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* comparison, use the secp256k1_ecdsa_signature_serialize_* and
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* secp256k1_ecdsa_signature_parse_* functions.
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*/
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typedef struct {
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unsigned char data[64];
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} secp256k1_ecdsa_signature;
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/** A pointer to a function to deterministically generate a nonce.
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*
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* Returns: 1 if a nonce was successfully generated. 0 will cause signing to fail.
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* Out: nonce32: pointer to a 32-byte array to be filled by the function.
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* In: msg32: the 32-byte message hash being verified (will not be NULL)
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* key32: pointer to a 32-byte secret key (will not be NULL)
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* algo16: pointer to a 16-byte array describing the signature
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* algorithm (will be NULL for ECDSA for compatibility).
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* data: Arbitrary data pointer that is passed through.
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* attempt: how many iterations we have tried to find a nonce.
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* This will almost always be 0, but different attempt values
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* are required to result in a different nonce.
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*
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* Except for test cases, this function should compute some cryptographic hash of
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* the message, the algorithm, the key and the attempt.
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*/
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typedef int (*secp256k1_nonce_function)(
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unsigned char *nonce32,
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const unsigned char *msg32,
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const unsigned char *key32,
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const unsigned char *algo16,
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void *data,
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unsigned int attempt
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);
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# if !defined(SECP256K1_GNUC_PREREQ)
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# if defined(__GNUC__)&&defined(__GNUC_MINOR__)
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# define SECP256K1_GNUC_PREREQ(_maj,_min) \
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((__GNUC__<<16)+__GNUC_MINOR__>=((_maj)<<16)+(_min))
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# else
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# define SECP256K1_GNUC_PREREQ(_maj,_min) 0
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# endif
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# endif
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/* When this header is used at build-time the SECP256K1_BUILD define needs to be set
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* to correctly setup export attributes and nullness checks. This is normally done
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* by secp256k1.c but to guard against this header being included before secp256k1.c
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* has had a chance to set the define (e.g. via test harnesses that just includes
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* secp256k1.c) we set SECP256K1_NO_BUILD when this header is processed without the
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* BUILD define so this condition can be caught.
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*/
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#ifndef SECP256K1_BUILD
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# define SECP256K1_NO_BUILD
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#endif
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/* Symbol visibility. */
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#if defined(_WIN32)
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/* GCC for Windows (e.g., MinGW) accepts the __declspec syntax
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* for MSVC compatibility. A __declspec declaration implies (but is not
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* exactly equivalent to) __attribute__ ((visibility("default"))), and so we
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* actually want __declspec even on GCC, see "Microsoft Windows Function
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* Attributes" in the GCC manual and the recommendations in
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* https://gcc.gnu.org/wiki/Visibility. */
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# if defined(SECP256K1_BUILD)
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# if defined(DLL_EXPORT) || defined(SECP256K1_DLL_EXPORT)
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/* Building libsecp256k1 as a DLL.
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* 1. If using Libtool, it defines DLL_EXPORT automatically.
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* 2. In other cases, SECP256K1_DLL_EXPORT must be defined. */
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# define SECP256K1_API extern __declspec (dllexport)
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# endif
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/* The user must define SECP256K1_STATIC when consuming libsecp256k1 as a static
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* library on Windows. */
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# elif !defined(SECP256K1_STATIC)
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/* Consuming libsecp256k1 as a DLL. */
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# define SECP256K1_API extern __declspec (dllimport)
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# endif
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#endif
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#ifndef SECP256K1_API
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# if defined(__GNUC__) && (__GNUC__ >= 4) && defined(SECP256K1_BUILD)
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/* Building libsecp256k1 on non-Windows using GCC or compatible. */
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# define SECP256K1_API extern __attribute__ ((visibility ("default")))
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# else
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/* All cases not captured above. */
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# define SECP256K1_API extern
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# endif
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#endif
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/* Warning attributes
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* NONNULL is not used if SECP256K1_BUILD is set to avoid the compiler optimizing out
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* some paranoid null checks. */
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# if defined(__GNUC__) && SECP256K1_GNUC_PREREQ(3, 4)
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# define SECP256K1_WARN_UNUSED_RESULT __attribute__ ((__warn_unused_result__))
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# else
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# define SECP256K1_WARN_UNUSED_RESULT
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# endif
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# if !defined(SECP256K1_BUILD) && defined(__GNUC__) && SECP256K1_GNUC_PREREQ(3, 4)
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# define SECP256K1_ARG_NONNULL(_x) __attribute__ ((__nonnull__(_x)))
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# else
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# define SECP256K1_ARG_NONNULL(_x)
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# endif
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/* Attribute for marking functions, types, and variables as deprecated */
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#if !defined(SECP256K1_BUILD) && defined(__has_attribute)
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# if __has_attribute(__deprecated__)
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# define SECP256K1_DEPRECATED(_msg) __attribute__ ((__deprecated__(_msg)))
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# else
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# define SECP256K1_DEPRECATED(_msg)
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# endif
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#else
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# define SECP256K1_DEPRECATED(_msg)
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#endif
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/* All flags' lower 8 bits indicate what they're for. Do not use directly. */
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#define SECP256K1_FLAGS_TYPE_MASK ((1 << 8) - 1)
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#define SECP256K1_FLAGS_TYPE_CONTEXT (1 << 0)
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#define SECP256K1_FLAGS_TYPE_COMPRESSION (1 << 1)
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/* The higher bits contain the actual data. Do not use directly. */
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#define SECP256K1_FLAGS_BIT_CONTEXT_VERIFY (1 << 8)
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#define SECP256K1_FLAGS_BIT_CONTEXT_SIGN (1 << 9)
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#define SECP256K1_FLAGS_BIT_CONTEXT_DECLASSIFY (1 << 10)
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#define SECP256K1_FLAGS_BIT_COMPRESSION (1 << 8)
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/** Context flags to pass to secp256k1_context_create, secp256k1_context_preallocated_size, and
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* secp256k1_context_preallocated_create. */
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#define SECP256K1_CONTEXT_NONE (SECP256K1_FLAGS_TYPE_CONTEXT)
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/** Deprecated context flags. These flags are treated equivalent to SECP256K1_CONTEXT_NONE. */
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#define SECP256K1_CONTEXT_VERIFY (SECP256K1_FLAGS_TYPE_CONTEXT | SECP256K1_FLAGS_BIT_CONTEXT_VERIFY)
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#define SECP256K1_CONTEXT_SIGN (SECP256K1_FLAGS_TYPE_CONTEXT | SECP256K1_FLAGS_BIT_CONTEXT_SIGN)
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/* Testing flag. Do not use. */
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#define SECP256K1_CONTEXT_DECLASSIFY (SECP256K1_FLAGS_TYPE_CONTEXT | SECP256K1_FLAGS_BIT_CONTEXT_DECLASSIFY)
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/** Flag to pass to secp256k1_ec_pubkey_serialize. */
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#define SECP256K1_EC_COMPRESSED (SECP256K1_FLAGS_TYPE_COMPRESSION | SECP256K1_FLAGS_BIT_COMPRESSION)
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#define SECP256K1_EC_UNCOMPRESSED (SECP256K1_FLAGS_TYPE_COMPRESSION)
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/** Prefix byte used to tag various encoded curvepoints for specific purposes */
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#define SECP256K1_TAG_PUBKEY_EVEN 0x02
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#define SECP256K1_TAG_PUBKEY_ODD 0x03
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#define SECP256K1_TAG_PUBKEY_UNCOMPRESSED 0x04
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#define SECP256K1_TAG_PUBKEY_HYBRID_EVEN 0x06
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#define SECP256K1_TAG_PUBKEY_HYBRID_ODD 0x07
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/** A built-in constant secp256k1 context object with static storage duration, to be
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* used in conjunction with secp256k1_selftest.
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*
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* This context object offers *only limited functionality* , i.e., it cannot be used
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* for API functions that perform computations involving secret keys, e.g., signing
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* and public key generation. If this restriction applies to a specific API function,
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* it is mentioned in its documentation. See secp256k1_context_create if you need a
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* full context object that supports all functionality offered by the library.
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*
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* It is highly recommended to call secp256k1_selftest before using this context.
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*/
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SECP256K1_API const secp256k1_context *secp256k1_context_static;
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/** Deprecated alias for secp256k1_context_static. */
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SECP256K1_API const secp256k1_context *secp256k1_context_no_precomp
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SECP256K1_DEPRECATED("Use secp256k1_context_static instead");
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/** Perform basic self tests (to be used in conjunction with secp256k1_context_static)
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*
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* This function performs self tests that detect some serious usage errors and
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* similar conditions, e.g., when the library is compiled for the wrong endianness.
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* This is a last resort measure to be used in production. The performed tests are
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* very rudimentary and are not intended as a replacement for running the test
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* binaries.
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*
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* It is highly recommended to call this before using secp256k1_context_static.
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* It is not necessary to call this function before using a context created with
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* secp256k1_context_create (or secp256k1_context_preallocated_create), which will
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* take care of performing the self tests.
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*
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* If the tests fail, this function will call the default error handler to abort the
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* program (see secp256k1_context_set_error_callback).
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*/
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SECP256K1_API void secp256k1_selftest(void);
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/** Create a secp256k1 context object (in dynamically allocated memory).
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*
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* This function uses malloc to allocate memory. It is guaranteed that malloc is
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* called at most once for every call of this function. If you need to avoid dynamic
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* memory allocation entirely, see secp256k1_context_static and the functions in
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* secp256k1_preallocated.h.
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*
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* Returns: a newly created context object.
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* In: flags: Always set to SECP256K1_CONTEXT_NONE (see below).
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*
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* The only valid non-deprecated flag in recent library versions is
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* SECP256K1_CONTEXT_NONE, which will create a context sufficient for all functionality
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* offered by the library. All other (deprecated) flags will be treated as equivalent
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* to the SECP256K1_CONTEXT_NONE flag. Though the flags parameter primarily exists for
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* historical reasons, future versions of the library may introduce new flags.
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*
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* If the context is intended to be used for API functions that perform computations
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* involving secret keys, e.g., signing and public key generation, then it is highly
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* recommended to call secp256k1_context_randomize on the context before calling
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* those API functions. This will provide enhanced protection against side-channel
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* leakage, see secp256k1_context_randomize for details.
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*
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* Do not create a new context object for each operation, as construction and
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* randomization can take non-negligible time.
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*/
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SECP256K1_API secp256k1_context *secp256k1_context_create(
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unsigned int flags
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) SECP256K1_WARN_UNUSED_RESULT;
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/** Copy a secp256k1 context object (into dynamically allocated memory).
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*
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* This function uses malloc to allocate memory. It is guaranteed that malloc is
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* called at most once for every call of this function. If you need to avoid dynamic
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* memory allocation entirely, see the functions in secp256k1_preallocated.h.
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*
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* Cloning secp256k1_context_static is not possible, and should not be emulated by
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* the caller (e.g., using memcpy). Create a new context instead.
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*
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* Returns: a newly created context object.
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* Args: ctx: an existing context to copy (not secp256k1_context_static)
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*/
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SECP256K1_API secp256k1_context *secp256k1_context_clone(
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const secp256k1_context *ctx
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) SECP256K1_ARG_NONNULL(1) SECP256K1_WARN_UNUSED_RESULT;
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/** Destroy a secp256k1 context object (created in dynamically allocated memory).
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*
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* The context pointer may not be used afterwards.
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*
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* The context to destroy must have been created using secp256k1_context_create
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* or secp256k1_context_clone. If the context has instead been created using
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* secp256k1_context_preallocated_create or secp256k1_context_preallocated_clone, the
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* behaviour is undefined. In that case, secp256k1_context_preallocated_destroy must
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* be used instead.
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*
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* Args: ctx: an existing context to destroy, constructed using
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* secp256k1_context_create or secp256k1_context_clone
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* (i.e., not secp256k1_context_static).
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*/
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SECP256K1_API void secp256k1_context_destroy(
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secp256k1_context *ctx
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) SECP256K1_ARG_NONNULL(1);
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/** Set a callback function to be called when an illegal argument is passed to
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* an API call. It will only trigger for violations that are mentioned
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* explicitly in the header.
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*
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* The philosophy is that these shouldn't be dealt with through a
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* specific return value, as calling code should not have branches to deal with
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* the case that this code itself is broken.
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*
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* On the other hand, during debug stage, one would want to be informed about
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* such mistakes, and the default (crashing) may be inadvisable.
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* When this callback is triggered, the API function called is guaranteed not
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* to cause a crash, though its return value and output arguments are
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* undefined.
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*
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* When this function has not been called (or called with fn==NULL), then the
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* default handler will be used. The library provides a default handler which
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* writes the message to stderr and calls abort. This default handler can be
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* replaced at link time if the preprocessor macro
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* USE_EXTERNAL_DEFAULT_CALLBACKS is defined, which is the case if the build
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* has been configured with --enable-external-default-callbacks. Then the
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* following two symbols must be provided to link against:
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* - void secp256k1_default_illegal_callback_fn(const char *message, void *data);
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* - void secp256k1_default_error_callback_fn(const char *message, void *data);
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* The library can call these default handlers even before a proper callback data
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* pointer could have been set using secp256k1_context_set_illegal_callback or
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* secp256k1_context_set_error_callback, e.g., when the creation of a context
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* fails. In this case, the corresponding default handler will be called with
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* the data pointer argument set to NULL.
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*
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* Args: ctx: an existing context object.
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* In: fun: a pointer to a function to call when an illegal argument is
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* passed to the API, taking a message and an opaque pointer.
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* (NULL restores the default handler.)
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* data: the opaque pointer to pass to fun above, must be NULL for the default handler.
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*
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* See also secp256k1_context_set_error_callback.
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*/
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SECP256K1_API void secp256k1_context_set_illegal_callback(
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secp256k1_context *ctx,
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void (*fun)(const char *message, void *data),
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const void *data
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) SECP256K1_ARG_NONNULL(1);
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/** Set a callback function to be called when an internal consistency check
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* fails.
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*
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* The default callback writes an error message to stderr and calls abort
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* to abort the program.
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*
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* This can only trigger in case of a hardware failure, miscompilation,
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* memory corruption, serious bug in the library, or other error would can
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* otherwise result in undefined behaviour. It will not trigger due to mere
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* incorrect usage of the API (see secp256k1_context_set_illegal_callback
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* for that). After this callback returns, anything may happen, including
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* crashing.
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*
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* Args: ctx: an existing context object.
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* In: fun: a pointer to a function to call when an internal error occurs,
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* taking a message and an opaque pointer (NULL restores the
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* default handler, see secp256k1_context_set_illegal_callback
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* for details).
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* data: the opaque pointer to pass to fun above, must be NULL for the default handler.
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*
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* See also secp256k1_context_set_illegal_callback.
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*/
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SECP256K1_API void secp256k1_context_set_error_callback(
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secp256k1_context *ctx,
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void (*fun)(const char *message, void *data),
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const void *data
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) SECP256K1_ARG_NONNULL(1);
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/** Create a secp256k1 scratch space object.
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*
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* Returns: a newly created scratch space.
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* Args: ctx: an existing context object.
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* In: size: amount of memory to be available as scratch space. Some extra
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* (<100 bytes) will be allocated for extra accounting.
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*/
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SECP256K1_API SECP256K1_WARN_UNUSED_RESULT secp256k1_scratch_space *secp256k1_scratch_space_create(
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const secp256k1_context *ctx,
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|
size_t size
|
|
) SECP256K1_ARG_NONNULL(1);
|
|
|
|
/** Destroy a secp256k1 scratch space.
|
|
*
|
|
* The pointer may not be used afterwards.
|
|
* Args: ctx: a secp256k1 context object.
|
|
* scratch: space to destroy
|
|
*/
|
|
SECP256K1_API void secp256k1_scratch_space_destroy(
|
|
const secp256k1_context *ctx,
|
|
secp256k1_scratch_space *scratch
|
|
) SECP256K1_ARG_NONNULL(1);
|
|
|
|
/** Parse a variable-length public key into the pubkey object.
|
|
*
|
|
* Returns: 1 if the public key was fully valid.
|
|
* 0 if the public key could not be parsed or is invalid.
|
|
* Args: ctx: a secp256k1 context object.
|
|
* Out: pubkey: pointer to a pubkey object. If 1 is returned, it is set to a
|
|
* parsed version of input. If not, its value is undefined.
|
|
* In: input: pointer to a serialized public key
|
|
* inputlen: length of the array pointed to by input
|
|
*
|
|
* This function supports parsing compressed (33 bytes, header byte 0x02 or
|
|
* 0x03), uncompressed (65 bytes, header byte 0x04), or hybrid (65 bytes, header
|
|
* byte 0x06 or 0x07) format public keys.
|
|
*/
|
|
SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_parse(
|
|
const secp256k1_context *ctx,
|
|
secp256k1_pubkey *pubkey,
|
|
const unsigned char *input,
|
|
size_t inputlen
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
|
|
|
|
/** Serialize a pubkey object into a serialized byte sequence.
|
|
*
|
|
* Returns: 1 always.
|
|
* Args: ctx: a secp256k1 context object.
|
|
* Out: output: a pointer to a 65-byte (if compressed==0) or 33-byte (if
|
|
* compressed==1) byte array to place the serialized key
|
|
* in.
|
|
* In/Out: outputlen: a pointer to an integer which is initially set to the
|
|
* size of output, and is overwritten with the written
|
|
* size.
|
|
* In: pubkey: a pointer to a secp256k1_pubkey containing an
|
|
* initialized public key.
|
|
* flags: SECP256K1_EC_COMPRESSED if serialization should be in
|
|
* compressed format, otherwise SECP256K1_EC_UNCOMPRESSED.
|
|
*/
|
|
SECP256K1_API int secp256k1_ec_pubkey_serialize(
|
|
const secp256k1_context *ctx,
|
|
unsigned char *output,
|
|
size_t *outputlen,
|
|
const secp256k1_pubkey *pubkey,
|
|
unsigned int flags
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
|
|
|
|
/** Compare two public keys using lexicographic (of compressed serialization) order
|
|
*
|
|
* Returns: <0 if the first public key is less than the second
|
|
* >0 if the first public key is greater than the second
|
|
* 0 if the two public keys are equal
|
|
* Args: ctx: a secp256k1 context object.
|
|
* In: pubkey1: first public key to compare
|
|
* pubkey2: second public key to compare
|
|
*/
|
|
SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_cmp(
|
|
const secp256k1_context *ctx,
|
|
const secp256k1_pubkey *pubkey1,
|
|
const secp256k1_pubkey *pubkey2
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
|
|
|
|
/** Parse an ECDSA signature in compact (64 bytes) format.
|
|
*
|
|
* Returns: 1 when the signature could be parsed, 0 otherwise.
|
|
* Args: ctx: a secp256k1 context object
|
|
* Out: sig: a pointer to a signature object
|
|
* In: input64: a pointer to the 64-byte array to parse
|
|
*
|
|
* The signature must consist of a 32-byte big endian R value, followed by a
|
|
* 32-byte big endian S value. If R or S fall outside of [0..order-1], the
|
|
* encoding is invalid. R and S with value 0 are allowed in the encoding.
|
|
*
|
|
* After the call, sig will always be initialized. If parsing failed or R or
|
|
* S are zero, the resulting sig value is guaranteed to fail verification for
|
|
* any message and public key.
|
|
*/
|
|
SECP256K1_API int secp256k1_ecdsa_signature_parse_compact(
|
|
const secp256k1_context *ctx,
|
|
secp256k1_ecdsa_signature *sig,
|
|
const unsigned char *input64
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
|
|
|
|
/** Parse a DER ECDSA signature.
|
|
*
|
|
* Returns: 1 when the signature could be parsed, 0 otherwise.
|
|
* Args: ctx: a secp256k1 context object
|
|
* Out: sig: a pointer to a signature object
|
|
* In: input: a pointer to the signature to be parsed
|
|
* inputlen: the length of the array pointed to be input
|
|
*
|
|
* This function will accept any valid DER encoded signature, even if the
|
|
* encoded numbers are out of range.
|
|
*
|
|
* After the call, sig will always be initialized. If parsing failed or the
|
|
* encoded numbers are out of range, signature verification with it is
|
|
* guaranteed to fail for every message and public key.
|
|
*/
|
|
SECP256K1_API int secp256k1_ecdsa_signature_parse_der(
|
|
const secp256k1_context *ctx,
|
|
secp256k1_ecdsa_signature *sig,
|
|
const unsigned char *input,
|
|
size_t inputlen
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
|
|
|
|
/** Serialize an ECDSA signature in DER format.
|
|
*
|
|
* Returns: 1 if enough space was available to serialize, 0 otherwise
|
|
* Args: ctx: a secp256k1 context object
|
|
* Out: output: a pointer to an array to store the DER serialization
|
|
* In/Out: outputlen: a pointer to a length integer. Initially, this integer
|
|
* should be set to the length of output. After the call
|
|
* it will be set to the length of the serialization (even
|
|
* if 0 was returned).
|
|
* In: sig: a pointer to an initialized signature object
|
|
*/
|
|
SECP256K1_API int secp256k1_ecdsa_signature_serialize_der(
|
|
const secp256k1_context *ctx,
|
|
unsigned char *output,
|
|
size_t *outputlen,
|
|
const secp256k1_ecdsa_signature *sig
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
|
|
|
|
/** Serialize an ECDSA signature in compact (64 byte) format.
|
|
*
|
|
* Returns: 1
|
|
* Args: ctx: a secp256k1 context object
|
|
* Out: output64: a pointer to a 64-byte array to store the compact serialization
|
|
* In: sig: a pointer to an initialized signature object
|
|
*
|
|
* See secp256k1_ecdsa_signature_parse_compact for details about the encoding.
|
|
*/
|
|
SECP256K1_API int secp256k1_ecdsa_signature_serialize_compact(
|
|
const secp256k1_context *ctx,
|
|
unsigned char *output64,
|
|
const secp256k1_ecdsa_signature *sig
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
|
|
|
|
/** Verify an ECDSA signature.
|
|
*
|
|
* Returns: 1: correct signature
|
|
* 0: incorrect or unparseable signature
|
|
* Args: ctx: a secp256k1 context object.
|
|
* In: sig: the signature being verified.
|
|
* msghash32: the 32-byte message hash being verified.
|
|
* The verifier must make sure to apply a cryptographic
|
|
* hash function to the message by itself and not accept an
|
|
* msghash32 value directly. Otherwise, it would be easy to
|
|
* create a "valid" signature without knowledge of the
|
|
* secret key. See also
|
|
* https://bitcoin.stackexchange.com/a/81116/35586 for more
|
|
* background on this topic.
|
|
* pubkey: pointer to an initialized public key to verify with.
|
|
*
|
|
* To avoid accepting malleable signatures, only ECDSA signatures in lower-S
|
|
* form are accepted.
|
|
*
|
|
* If you need to accept ECDSA signatures from sources that do not obey this
|
|
* rule, apply secp256k1_ecdsa_signature_normalize to the signature prior to
|
|
* verification, but be aware that doing so results in malleable signatures.
|
|
*
|
|
* For details, see the comments for that function.
|
|
*/
|
|
SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ecdsa_verify(
|
|
const secp256k1_context *ctx,
|
|
const secp256k1_ecdsa_signature *sig,
|
|
const unsigned char *msghash32,
|
|
const secp256k1_pubkey *pubkey
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
|
|
|
|
/** Convert a signature to a normalized lower-S form.
|
|
*
|
|
* Returns: 1 if sigin was not normalized, 0 if it already was.
|
|
* Args: ctx: a secp256k1 context object
|
|
* Out: sigout: a pointer to a signature to fill with the normalized form,
|
|
* or copy if the input was already normalized. (can be NULL if
|
|
* you're only interested in whether the input was already
|
|
* normalized).
|
|
* In: sigin: a pointer to a signature to check/normalize (can be identical to sigout)
|
|
*
|
|
* With ECDSA a third-party can forge a second distinct signature of the same
|
|
* message, given a single initial signature, but without knowing the key. This
|
|
* is done by negating the S value modulo the order of the curve, 'flipping'
|
|
* the sign of the random point R which is not included in the signature.
|
|
*
|
|
* Forgery of the same message isn't universally problematic, but in systems
|
|
* where message malleability or uniqueness of signatures is important this can
|
|
* cause issues. This forgery can be blocked by all verifiers forcing signers
|
|
* to use a normalized form.
|
|
*
|
|
* The lower-S form reduces the size of signatures slightly on average when
|
|
* variable length encodings (such as DER) are used and is cheap to verify,
|
|
* making it a good choice. Security of always using lower-S is assured because
|
|
* anyone can trivially modify a signature after the fact to enforce this
|
|
* property anyway.
|
|
*
|
|
* The lower S value is always between 0x1 and
|
|
* 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0,
|
|
* inclusive.
|
|
*
|
|
* No other forms of ECDSA malleability are known and none seem likely, but
|
|
* there is no formal proof that ECDSA, even with this additional restriction,
|
|
* is free of other malleability. Commonly used serialization schemes will also
|
|
* accept various non-unique encodings, so care should be taken when this
|
|
* property is required for an application.
|
|
*
|
|
* The secp256k1_ecdsa_sign function will by default create signatures in the
|
|
* lower-S form, and secp256k1_ecdsa_verify will not accept others. In case
|
|
* signatures come from a system that cannot enforce this property,
|
|
* secp256k1_ecdsa_signature_normalize must be called before verification.
|
|
*/
|
|
SECP256K1_API int secp256k1_ecdsa_signature_normalize(
|
|
const secp256k1_context *ctx,
|
|
secp256k1_ecdsa_signature *sigout,
|
|
const secp256k1_ecdsa_signature *sigin
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(3);
|
|
|
|
/** An implementation of RFC6979 (using HMAC-SHA256) as nonce generation function.
|
|
* If a data pointer is passed, it is assumed to be a pointer to 32 bytes of
|
|
* extra entropy.
|
|
*/
|
|
SECP256K1_API const secp256k1_nonce_function secp256k1_nonce_function_rfc6979;
|
|
|
|
/** A default safe nonce generation function (currently equal to secp256k1_nonce_function_rfc6979). */
|
|
SECP256K1_API const secp256k1_nonce_function secp256k1_nonce_function_default;
|
|
|
|
/** Create an ECDSA signature.
|
|
*
|
|
* Returns: 1: signature created
|
|
* 0: the nonce generation function failed, or the secret key was invalid.
|
|
* Args: ctx: pointer to a context object (not secp256k1_context_static).
|
|
* Out: sig: pointer to an array where the signature will be placed.
|
|
* In: msghash32: the 32-byte message hash being signed.
|
|
* seckey: pointer to a 32-byte secret key.
|
|
* noncefp: pointer to a nonce generation function. If NULL,
|
|
* secp256k1_nonce_function_default is used.
|
|
* ndata: pointer to arbitrary data used by the nonce generation function
|
|
* (can be NULL). If it is non-NULL and
|
|
* secp256k1_nonce_function_default is used, then ndata must be a
|
|
* pointer to 32-bytes of additional data.
|
|
*
|
|
* The created signature is always in lower-S form. See
|
|
* secp256k1_ecdsa_signature_normalize for more details.
|
|
*/
|
|
SECP256K1_API int secp256k1_ecdsa_sign(
|
|
const secp256k1_context *ctx,
|
|
secp256k1_ecdsa_signature *sig,
|
|
const unsigned char *msghash32,
|
|
const unsigned char *seckey,
|
|
secp256k1_nonce_function noncefp,
|
|
const void *ndata
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
|
|
|
|
/** Verify an ECDSA secret key.
|
|
*
|
|
* A secret key is valid if it is not 0 and less than the secp256k1 curve order
|
|
* when interpreted as an integer (most significant byte first). The
|
|
* probability of choosing a 32-byte string uniformly at random which is an
|
|
* invalid secret key is negligible.
|
|
*
|
|
* Returns: 1: secret key is valid
|
|
* 0: secret key is invalid
|
|
* Args: ctx: pointer to a context object.
|
|
* In: seckey: pointer to a 32-byte secret key.
|
|
*/
|
|
SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_seckey_verify(
|
|
const secp256k1_context *ctx,
|
|
const unsigned char *seckey
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2);
|
|
|
|
/** Compute the public key for a secret key.
|
|
*
|
|
* Returns: 1: secret was valid, public key stores.
|
|
* 0: secret was invalid, try again.
|
|
* Args: ctx: pointer to a context object (not secp256k1_context_static).
|
|
* Out: pubkey: pointer to the created public key.
|
|
* In: seckey: pointer to a 32-byte secret key.
|
|
*/
|
|
SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_create(
|
|
const secp256k1_context *ctx,
|
|
secp256k1_pubkey *pubkey,
|
|
const unsigned char *seckey
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
|
|
|
|
/** Negates a secret key in place.
|
|
*
|
|
* Returns: 0 if the given secret key is invalid according to
|
|
* secp256k1_ec_seckey_verify. 1 otherwise
|
|
* Args: ctx: pointer to a context object
|
|
* In/Out: seckey: pointer to the 32-byte secret key to be negated. If the
|
|
* secret key is invalid according to
|
|
* secp256k1_ec_seckey_verify, this function returns 0 and
|
|
* seckey will be set to some unspecified value.
|
|
*/
|
|
SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_seckey_negate(
|
|
const secp256k1_context *ctx,
|
|
unsigned char *seckey
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2);
|
|
|
|
/** Same as secp256k1_ec_seckey_negate, but DEPRECATED. Will be removed in
|
|
* future versions. */
|
|
SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_privkey_negate(
|
|
const secp256k1_context *ctx,
|
|
unsigned char *seckey
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2)
|
|
SECP256K1_DEPRECATED("Use secp256k1_ec_seckey_negate instead");
|
|
|
|
/** Negates a public key in place.
|
|
*
|
|
* Returns: 1 always
|
|
* Args: ctx: pointer to a context object
|
|
* In/Out: pubkey: pointer to the public key to be negated.
|
|
*/
|
|
SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_negate(
|
|
const secp256k1_context *ctx,
|
|
secp256k1_pubkey *pubkey
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2);
|
|
|
|
/** Tweak a secret key by adding tweak to it.
|
|
*
|
|
* Returns: 0 if the arguments are invalid or the resulting secret key would be
|
|
* invalid (only when the tweak is the negation of the secret key). 1
|
|
* otherwise.
|
|
* Args: ctx: pointer to a context object.
|
|
* In/Out: seckey: pointer to a 32-byte secret key. If the secret key is
|
|
* invalid according to secp256k1_ec_seckey_verify, this
|
|
* function returns 0. seckey will be set to some unspecified
|
|
* value if this function returns 0.
|
|
* In: tweak32: pointer to a 32-byte tweak, which must be valid according to
|
|
* secp256k1_ec_seckey_verify or 32 zero bytes. For uniformly
|
|
* random 32-byte tweaks, the chance of being invalid is
|
|
* negligible (around 1 in 2^128).
|
|
*/
|
|
SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_seckey_tweak_add(
|
|
const secp256k1_context *ctx,
|
|
unsigned char *seckey,
|
|
const unsigned char *tweak32
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
|
|
|
|
/** Same as secp256k1_ec_seckey_tweak_add, but DEPRECATED. Will be removed in
|
|
* future versions. */
|
|
SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_privkey_tweak_add(
|
|
const secp256k1_context *ctx,
|
|
unsigned char *seckey,
|
|
const unsigned char *tweak32
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3)
|
|
SECP256K1_DEPRECATED("Use secp256k1_ec_seckey_tweak_add instead");
|
|
|
|
/** Tweak a public key by adding tweak times the generator to it.
|
|
*
|
|
* Returns: 0 if the arguments are invalid or the resulting public key would be
|
|
* invalid (only when the tweak is the negation of the corresponding
|
|
* secret key). 1 otherwise.
|
|
* Args: ctx: pointer to a context object.
|
|
* In/Out: pubkey: pointer to a public key object. pubkey will be set to an
|
|
* invalid value if this function returns 0.
|
|
* In: tweak32: pointer to a 32-byte tweak, which must be valid according to
|
|
* secp256k1_ec_seckey_verify or 32 zero bytes. For uniformly
|
|
* random 32-byte tweaks, the chance of being invalid is
|
|
* negligible (around 1 in 2^128).
|
|
*/
|
|
SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_tweak_add(
|
|
const secp256k1_context *ctx,
|
|
secp256k1_pubkey *pubkey,
|
|
const unsigned char *tweak32
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
|
|
|
|
/** Tweak a secret key by multiplying it by a tweak.
|
|
*
|
|
* Returns: 0 if the arguments are invalid. 1 otherwise.
|
|
* Args: ctx: pointer to a context object.
|
|
* In/Out: seckey: pointer to a 32-byte secret key. If the secret key is
|
|
* invalid according to secp256k1_ec_seckey_verify, this
|
|
* function returns 0. seckey will be set to some unspecified
|
|
* value if this function returns 0.
|
|
* In: tweak32: pointer to a 32-byte tweak. If the tweak is invalid according to
|
|
* secp256k1_ec_seckey_verify, this function returns 0. For
|
|
* uniformly random 32-byte arrays the chance of being invalid
|
|
* is negligible (around 1 in 2^128).
|
|
*/
|
|
SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_seckey_tweak_mul(
|
|
const secp256k1_context *ctx,
|
|
unsigned char *seckey,
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|
const unsigned char *tweak32
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
|
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/** Same as secp256k1_ec_seckey_tweak_mul, but DEPRECATED. Will be removed in
|
|
* future versions. */
|
|
SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_privkey_tweak_mul(
|
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const secp256k1_context *ctx,
|
|
unsigned char *seckey,
|
|
const unsigned char *tweak32
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3)
|
|
SECP256K1_DEPRECATED("Use secp256k1_ec_seckey_tweak_mul instead");
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|
|
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/** Tweak a public key by multiplying it by a tweak value.
|
|
*
|
|
* Returns: 0 if the arguments are invalid. 1 otherwise.
|
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* Args: ctx: pointer to a context object.
|
|
* In/Out: pubkey: pointer to a public key object. pubkey will be set to an
|
|
* invalid value if this function returns 0.
|
|
* In: tweak32: pointer to a 32-byte tweak. If the tweak is invalid according to
|
|
* secp256k1_ec_seckey_verify, this function returns 0. For
|
|
* uniformly random 32-byte arrays the chance of being invalid
|
|
* is negligible (around 1 in 2^128).
|
|
*/
|
|
SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_tweak_mul(
|
|
const secp256k1_context *ctx,
|
|
secp256k1_pubkey *pubkey,
|
|
const unsigned char *tweak32
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
|
|
|
|
/** Randomizes the context to provide enhanced protection against side-channel leakage.
|
|
*
|
|
* Returns: 1: randomization successful
|
|
* 0: error
|
|
* Args: ctx: pointer to a context object (not secp256k1_context_static).
|
|
* In: seed32: pointer to a 32-byte random seed (NULL resets to initial state).
|
|
*
|
|
* While secp256k1 code is written and tested to be constant-time no matter what
|
|
* secret values are, it is possible that a compiler may output code which is not,
|
|
* and also that the CPU may not emit the same radio frequencies or draw the same
|
|
* amount of power for all values. Randomization of the context shields against
|
|
* side-channel observations which aim to exploit secret-dependent behaviour in
|
|
* certain computations which involve secret keys.
|
|
*
|
|
* It is highly recommended to call this function on contexts returned from
|
|
* secp256k1_context_create or secp256k1_context_clone (or from the corresponding
|
|
* functions in secp256k1_preallocated.h) before using these contexts to call API
|
|
* functions that perform computations involving secret keys, e.g., signing and
|
|
* public key generation. It is possible to call this function more than once on
|
|
* the same context, and doing so before every few computations involving secret
|
|
* keys is recommended as a defense-in-depth measure. Randomization of the static
|
|
* context secp256k1_context_static is not supported.
|
|
*
|
|
* Currently, the random seed is mainly used for blinding multiplications of a
|
|
* secret scalar with the elliptic curve base point. Multiplications of this
|
|
* kind are performed by exactly those API functions which are documented to
|
|
* require a context that is not secp256k1_context_static. As a rule of thumb,
|
|
* these are all functions which take a secret key (or a keypair) as an input.
|
|
* A notable exception to that rule is the ECDH module, which relies on a different
|
|
* kind of elliptic curve point multiplication and thus does not benefit from
|
|
* enhanced protection against side-channel leakage currently.
|
|
*/
|
|
SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_context_randomize(
|
|
secp256k1_context *ctx,
|
|
const unsigned char *seed32
|
|
) SECP256K1_ARG_NONNULL(1);
|
|
|
|
/** Add a number of public keys together.
|
|
*
|
|
* Returns: 1: the sum of the public keys is valid.
|
|
* 0: the sum of the public keys is not valid.
|
|
* Args: ctx: pointer to a context object.
|
|
* Out: out: pointer to a public key object for placing the resulting public key.
|
|
* In: ins: pointer to array of pointers to public keys.
|
|
* n: the number of public keys to add together (must be at least 1).
|
|
*/
|
|
SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_combine(
|
|
const secp256k1_context *ctx,
|
|
secp256k1_pubkey *out,
|
|
const secp256k1_pubkey * const *ins,
|
|
size_t n
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
|
|
|
|
/** Compute a tagged hash as defined in BIP-340.
|
|
*
|
|
* This is useful for creating a message hash and achieving domain separation
|
|
* through an application-specific tag. This function returns
|
|
* SHA256(SHA256(tag)||SHA256(tag)||msg). Therefore, tagged hash
|
|
* implementations optimized for a specific tag can precompute the SHA256 state
|
|
* after hashing the tag hashes.
|
|
*
|
|
* Returns: 1 always.
|
|
* Args: ctx: pointer to a context object
|
|
* Out: hash32: pointer to a 32-byte array to store the resulting hash
|
|
* In: tag: pointer to an array containing the tag
|
|
* taglen: length of the tag array
|
|
* msg: pointer to an array containing the message
|
|
* msglen: length of the message array
|
|
*/
|
|
SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_tagged_sha256(
|
|
const secp256k1_context *ctx,
|
|
unsigned char *hash32,
|
|
const unsigned char *tag,
|
|
size_t taglen,
|
|
const unsigned char *msg,
|
|
size_t msglen
|
|
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(5);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* SECP256K1_H */
|