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#ifndef _IPXE_HMAC_H
#define _IPXE_HMAC_H
/** @file
*
* Keyed-Hashing for Message Authentication
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <ipxe/crypto.h>
/** HMAC context type */
#define hmac_context_t( digest ) struct { \
/** Digest context */ \
uint8_t ctx[ digest->ctxsize ]; \
/** HMAC input/output padding */ \
uint8_t pad[ digest->blocksize ]; \
} __attribute__ (( packed ))
/**
* Calculate HMAC context size
*
* @v digest Digest algorithm to use
* @ret len HMAC context size
*/
static inline __attribute__ (( always_inline )) size_t
hmac_ctxsize ( struct digest_algorithm *digest ) {
hmac_context_t ( digest ) *hctx;
return sizeof ( *hctx );
}
/**
* Update HMAC
*
* @v digest Digest algorithm to use
* @v ctx HMAC context
* @v data Data
* @v len Length of data
*/
static inline void hmac_update ( struct digest_algorithm *digest, void *ctx,
const void *data, size_t len ) {
hmac_context_t ( digest ) *hctx = ctx;
digest_update ( digest, hctx->ctx, data, len );
}
extern void hmac_init ( struct digest_algorithm *digest, void *ctx,
const void *key, size_t key_len );
extern void hmac_final ( struct digest_algorithm *digest, void *ctx,
void *hmac );
#endif /* _IPXE_HMAC_H */
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