56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
#include "config.h"
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#include <bitcoin/privkey.h>
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#include <ccan/array_size/array_size.h>
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#include <ccan/mem/mem.h>
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#include <common/hmac.h>
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#include <wire/wire.h>
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void hmac_start(crypto_auth_hmacsha256_state *state,
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const void *key, size_t klen)
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{
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crypto_auth_hmacsha256_init(state, memcheck(key, klen), klen);
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}
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void hmac_update(crypto_auth_hmacsha256_state *state,
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const void *src, size_t slen)
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{
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crypto_auth_hmacsha256_update(state, memcheck(src, slen), slen);
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}
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void hmac_done(crypto_auth_hmacsha256_state *state,
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struct hmac *hmac)
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{
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crypto_auth_hmacsha256_final(state, hmac->bytes);
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}
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void hmac(const void *src, size_t slen,
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const void *key, size_t klen,
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struct hmac *hmac)
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{
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crypto_auth_hmacsha256_state state;
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hmac_start(&state, key, klen);
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hmac_update(&state, src, slen);
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hmac_done(&state, hmac);
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}
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void subkey_from_hmac(const char *prefix,
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const struct secret *base,
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struct secret *key)
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{
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struct hmac h;
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hmac(base->data, sizeof(base->data), prefix, strlen(prefix), &h);
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BUILD_ASSERT(sizeof(h.bytes) == sizeof(key->data));
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memcpy(key->data, h.bytes, sizeof(key->data));
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}
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void towire_hmac(u8 **pptr, const struct hmac *hmac)
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{
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towire_u8_array(pptr, hmac->bytes, ARRAY_SIZE(hmac->bytes));
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}
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void fromwire_hmac(const u8 **ptr, size_t *max, struct hmac *hmac)
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{
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fromwire_u8_array(ptr, max, hmac->bytes, ARRAY_SIZE(hmac->bytes));
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}
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