sha256.h

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#ifndef _IPXE_SHA256_H
#define _IPXE_SHA256_H
 
/** @file
 *
 * SHA-256 algorithm
 *
 */
 
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
FILE_SECBOOT ( PERMITTED );
 
#include <stdint.h>
#include <endian.h>
#include <ipxe/crypto.h>
#include <ipxe/mdhash.h>
 
/** SHA-256 number of rounds */
#define SHA256_ROUNDS 64
 
/** An SHA-256 digest */
struct sha256_digest {
        /** Hash output */
        uint32_t h[8];
};
 
/** An SHA-256 data block */
union sha256_block {
        /** Raw bytes */
        uint8_t byte[64];
        /** Raw dwords */
        uint32_t dword[16];
        /** Final block structure */
        struct {
                /** Padding */
                uint8_t pad[56];
                /** Length in bits */
                uint64_t len;
        } final;
};
 
/** SHA-256 digest and data block
 *
 * The order of fields within this structure is designed to minimise
 * code size.
 */
struct sha256_digest_data {
        /** Digest of data already processed */
        struct sha256_digest digest;
        /** Accumulated data */
        union sha256_block data;
} __attribute__ (( packed ));
 
/** SHA-256 context size */
#define SHA256_CTX_SIZE MDHASH_CTX_SIZE ( struct sha256_digest_data )
 
/** SHA-256 block size */
#define SHA256_BLOCK_SIZE sizeof ( union sha256_block )
 
/** SHA-256 digest size */
#define SHA256_DIGEST_SIZE sizeof ( struct sha256_digest )
 
/** SHA-224 digest size */
#define SHA224_DIGEST_SIZE ( SHA256_DIGEST_SIZE * 224 / 256 )
 
extern void sha256_compress ( struct sha256_digest_data *dd,
                              const struct sha256_digest *digest );
 
/** Define a SHA-256 family digest algorithm */
#define SHA256_ALGORITHM( _name, _digest, _init, _digestsize )          \
        MDHASH_ALGORITHM( _name, _digest, sha256_compress,              \
                          __BIG_ENDIAN, struct sha256_digest_data,      \
                          _init, _digestsize )
 
extern struct digest_algorithm sha256_algorithm;
extern struct digest_algorithm sha224_algorithm;
 
#endif /* _IPXE_SHA256_H */