wimboot_bios/sha1.h at master · grub4dos/wimboot_bios · GitHub

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#ifndef _SHA1_H
#define _SHA1_H

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

#include <stdint.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 digest size */
#define SHA1_DIGEST_SIZE sizeof ( struct sha1_digest )

extern void sha1_init (void *ctx);
extern void sha1_update (void *ctx, const void *data, size_t len);
extern void sha1_final (void *ctx, void *out);

#endif /* _SHA1_H */