40 lines
1.0 KiB
C
40 lines
1.0 KiB
C
#ifndef LIGHTNING_COMMON_HMAC_H
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#define LIGHTNING_COMMON_HMAC_H
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#include "config.h"
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#include <ccan/short_types/short_types.h>
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#include <ccan/structeq/structeq.h>
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#include <sodium/crypto_auth_hmacsha256.h>
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struct secret;
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/* HMAC used by Sphinx: SHA256 */
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struct hmac {
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u8 bytes[crypto_auth_hmacsha256_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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void hmac_start(crypto_auth_hmacsha256_state *state,
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const void *key, size_t klen);
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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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void hmac_done(crypto_auth_hmacsha256_state *state,
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struct hmac *hmac);
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/* Common style: hmac to derive key using fixed string prefix. */
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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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void towire_hmac(u8 **pptr, const struct hmac *hmac);
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void fromwire_hmac(const u8 **ptr, size_t *max, struct hmac *hmac);
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/* Define hmac_eq. */
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STRUCTEQ_DEF(hmac, 0, bytes);
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#endif /* LIGHTNING_COMMON_HMAC_H */
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