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Needed for creating/verifying signatures on bolt11 invoices. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>ppa-0.6.1
Rusty Russell
7 years ago
3 changed files with 70 additions and 1 deletions
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#include <ccan/endian/endian.h> |
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#include <common/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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/* bech32 (thus bolt11) deal in 5-bit values */ |
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#ifndef LIGHTNING_COMMON_HASH_U5_H |
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#define LIGHTNING_COMMON_HASH_U5_H |
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#include "config.h" |
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#include <ccan/crypto/sha256/sha256.h> |
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#include <ccan/short_types/short_types.h> |
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/* Type to annotate a 5 bit value. */ |
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typedef unsigned char u5; |
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struct hash_u5 { |
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u64 buf; |
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unsigned int num_bits; |
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struct sha256_ctx hash; |
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}; |
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void hash_u5_init(struct hash_u5 *hu5, const char *hrp); |
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void hash_u5(struct hash_u5 *hu5, const u5 *u5, size_t len); |
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void hash_u5_done(struct hash_u5 *hu5, struct sha256 *res); |
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#endif /* LIGHTNING_COMMON_HASH_U5_H */ |
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