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