sha1.h

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#ifndef _IPXE_SHA1_H
#define _IPXE_SHA1_H

/** @file
 *
 * SHA-1 algorithm
 *
 */

FILE_LICENCE ( GPL2_OR_LATER );

#include <stdint.h>
#include <ipxe/crypto.h>

/** An SHA-1 digest */
struct sha1_digest {
        /** Hash output */
        uint32_t h[5];
};

/** An SHA-1 data block */
union sha1_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-1 digest and data block
 *
 * The order of fields within this structure is designed to minimise
 * code size.
 */
struct sha1_digest_data {
        /** Digest of data already processed */
        struct sha1_digest digest;
        /** Accumulated data */
        union sha1_block data;
} __attribute__ (( packed ));

/** SHA-1 digest and data block */
union sha1_digest_data_dwords {
        /** Digest and data block */
        struct sha1_digest_data dd;
        /** Raw dwords */
        uint32_t dword[ sizeof ( struct sha1_digest_data ) /
                        sizeof ( uint32_t ) ];
};

/** An SHA-1 context */
struct sha1_context {
        /** Amount of accumulated data */
        size_t len;
        /** Digest and accumulated data */
        union sha1_digest_data_dwords ddd;
} __attribute__ (( packed ));

/** SHA-1 context size */
#define SHA1_CTX_SIZE sizeof ( struct sha1_context )

/** SHA-1 block size */
#define SHA1_BLOCK_SIZE sizeof ( union sha1_block )

/** SHA-1 digest size */
#define SHA1_DIGEST_SIZE sizeof ( struct sha1_digest )

extern struct digest_algorithm sha1_algorithm;

extern void prf_sha1 ( const void *key, size_t key_len, const char *label,
                       const void *data, size_t data_len, void *prf,
                       size_t prf_len );
extern void pbkdf2_sha1 ( const void *passphrase, size_t pass_len,
                          const void *salt, size_t salt_len,
                          int iterations, void *key, size_t key_len );

#endif /* _IPXE_SHA1_H */