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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(const void *src, size_t slen,
const void *key, size_t klen,
struct hmac *hmac)
{
crypto_auth_hmacsha256_state state;
crypto_auth_hmacsha256_init(&state, memcheck(key, klen), klen);
crypto_auth_hmacsha256_update(&state, memcheck(src, slen), slen);
crypto_auth_hmacsha256_final(&state, hmac->bytes);
}
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));
}