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git://jb55.com/damus
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dbe1260b54
We'll need this for our lightning invoice view Signed-off-by: William Casarin <jb55@jb55.com>
49 lines
1.0 KiB
C
49 lines
1.0 KiB
C
#include "config.h"
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#include "endian.h"
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#include "hash_u5.h"
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#include <string.h>
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void hash_u5_init(struct hash_u5 *hu5, const char *hrp)
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{
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hu5->buf = 0;
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hu5->num_bits = 0;
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sha256_init(&hu5->hash);
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sha256_update(&hu5->hash, hrp, strlen(hrp));
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}
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void hash_u5(struct hash_u5 *hu5, const u8 *u5, size_t len)
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{
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size_t bits = len * 5;
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while (bits) {
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size_t n = 5;
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if (bits < n)
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n = bits;
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hu5->buf <<= n;
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hu5->buf |= (*u5 >> (5-n));
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bits -= n;
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hu5->num_bits += n;
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if (n == 5)
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u5++;
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if (hu5->num_bits >= 32) {
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be32 be32 = cpu_to_be32(hu5->buf >> (hu5->num_bits-32));
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sha256_update(&hu5->hash, &be32, sizeof(be32));
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hu5->num_bits -= 32;
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}
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}
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}
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void hash_u5_done(struct hash_u5 *hu5, struct sha256 *res)
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{
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if (hu5->num_bits) {
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be32 be32 = cpu_to_be32(hu5->buf << (32 - hu5->num_bits));
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sha256_update(&hu5->hash, &be32, (hu5->num_bits + 7) / 8);
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}
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sha256_done(&hu5->hash, res);
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}
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