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- #ifndef _IPXE_SHA256_H
- #define _IPXE_SHA256_H
-
- /** @file
- *
- * SHA-256 algorithm
- *
- */
-
- FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
-
- #include <stdint.h>
- #include <ipxe/crypto.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 digest and data block */
- union sha256_digest_data_dwords {
- /** Digest and data block */
- struct sha256_digest_data dd;
- /** Raw dwords */
- uint32_t dword[ sizeof ( struct sha256_digest_data ) /
- sizeof ( uint32_t ) ];
- };
-
- /** An SHA-256 context */
- struct sha256_context {
- /** Amount of accumulated data */
- size_t len;
- /** Digest size */
- size_t digestsize;
- /** Digest and accumulated data */
- union sha256_digest_data_dwords ddd;
- } __attribute__ (( packed ));
-
- /** SHA-256 context size */
- #define SHA256_CTX_SIZE sizeof ( struct sha256_context )
-
- /** 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_family_init ( struct sha256_context *context,
- const struct sha256_digest *init,
- size_t digestsize );
- extern void sha256_update ( void *ctx, const void *data, size_t len );
- extern void sha256_final ( void *ctx, void *out );
-
- extern struct digest_algorithm sha256_algorithm;
- extern struct digest_algorithm sha224_algorithm;
-
- #endif /* _IPXE_SHA256_H */
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