89 lines
2.0 KiB
C
89 lines
2.0 KiB
C
#ifndef _IPXE_SHA256_H
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#define _IPXE_SHA256_H
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/** @file
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*
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* SHA-256 algorithm
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <stdint.h>
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#include <ipxe/crypto.h>
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/** SHA-256 number of rounds */
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#define SHA256_ROUNDS 64
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/** An SHA-256 digest */
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struct sha256_digest {
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/** Hash output */
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uint32_t h[8];
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};
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/** An SHA-256 data block */
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union sha256_block {
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/** Raw bytes */
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uint8_t byte[64];
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/** Raw dwords */
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uint32_t dword[16];
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/** Final block structure */
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struct {
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/** Padding */
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uint8_t pad[56];
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/** Length in bits */
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uint64_t len;
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} final;
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};
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/** SHA-256 digest and data block
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*
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* The order of fields within this structure is designed to minimise
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* code size.
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*/
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struct sha256_digest_data {
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/** Digest of data already processed */
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struct sha256_digest digest;
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/** Accumulated data */
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union sha256_block data;
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} __attribute__ (( packed ));
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/** SHA-256 digest and data block */
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union sha256_digest_data_dwords {
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/** Digest and data block */
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struct sha256_digest_data dd;
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/** Raw dwords */
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uint32_t dword[ sizeof ( struct sha256_digest_data ) /
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sizeof ( uint32_t ) ];
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};
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/** An SHA-256 context */
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struct sha256_context {
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/** Amount of accumulated data */
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size_t len;
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/** Digest size */
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size_t digestsize;
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/** Digest and accumulated data */
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union sha256_digest_data_dwords ddd;
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} __attribute__ (( packed ));
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/** SHA-256 context size */
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#define SHA256_CTX_SIZE sizeof ( struct sha256_context )
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/** SHA-256 digest size */
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#define SHA256_DIGEST_SIZE sizeof ( struct sha256_digest )
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/** SHA-224 digest size */
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#define SHA224_DIGEST_SIZE ( SHA256_DIGEST_SIZE * 224 / 256 )
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extern void sha256_family_init ( struct sha256_context *context,
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const struct sha256_digest *init,
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size_t digestsize );
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extern void sha256_update ( void *ctx, const void *data, size_t len );
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extern void sha256_final ( void *ctx, void *out );
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extern struct digest_algorithm sha256_algorithm;
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extern struct digest_algorithm sha224_algorithm;
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#endif /* _IPXE_SHA256_H */
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