kc3-lang/libmd/src/sha2.c

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• Hash : 4c5931f5
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  Date : 2023-04-06T20:37:41
  

  Sync SHA2 changes from OpenBSD This adds support for SHA224 and SHA512-256.

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• src/sha2.c

• /*	$OpenBSD: sha2.c,v 1.28 2019/07/23 12:35:22 dtucker Exp $	*/
  
  /*
   * FILE:	sha2.c
   * AUTHOR:	Aaron D. Gifford <me@aarongifford.com>
   * 
   * Copyright (c) 2000-2001, Aaron D. Gifford
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the copyright holder nor the names of contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   * 
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTOR(S) ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTOR(S) BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   * $From: sha2.c,v 1.1 2001/11/08 00:01:51 adg Exp adg $
   */
  
  #include <config.h>
  #include "local-link.h"
  
  #include <sys/types.h>
  
  #include <string.h>
  #include <sha2.h>
  
  /*
   * UNROLLED TRANSFORM LOOP NOTE:
   * You can define SHA2_UNROLL_TRANSFORM to use the unrolled transform
   * loop version for the hash transform rounds (defined using macros
   * later in this file).  Either define on the command line, for example:
   *
   *   cc -DSHA2_UNROLL_TRANSFORM -o sha2 sha2.c sha2prog.c
   *
   * or define below:
   *
   *   #define SHA2_UNROLL_TRANSFORM
   *
   */
  #ifndef SHA2_SMALL
  #if defined(__amd64__) || defined(__i386__)
  #define SHA2_UNROLL_TRANSFORM
  #endif
  #endif
  
  /*** SHA-224/256/384/512 Various Length Definitions ***********************/
  /* NOTE: Most of these are in sha2.h */
  #define SHA224_SHORT_BLOCK_LENGTH	(SHA224_BLOCK_LENGTH - 8)
  #define SHA256_SHORT_BLOCK_LENGTH	(SHA256_BLOCK_LENGTH - 8)
  #define SHA384_SHORT_BLOCK_LENGTH	(SHA384_BLOCK_LENGTH - 16)
  #define SHA512_SHORT_BLOCK_LENGTH	(SHA512_BLOCK_LENGTH - 16)
  
  /*** ENDIAN SPECIFIC COPY MACROS **************************************/
  #define BE_8_TO_32(dst, cp) do {					\
  	(dst) = (uint32_t)(cp)[3] | ((uint32_t)(cp)[2] << 8) |		\
  	    ((uint32_t)(cp)[1] << 16) | ((uint32_t)(cp)[0] << 24);	\
  } while(0)
  
  #define BE_8_TO_64(dst, cp) do {					\
  	(dst) = (uint64_t)(cp)[7] | ((uint64_t)(cp)[6] << 8) |		\
  	    ((uint64_t)(cp)[5] << 16) | ((uint64_t)(cp)[4] << 24) |	\
  	    ((uint64_t)(cp)[3] << 32) | ((uint64_t)(cp)[2] << 40) |	\
  	    ((uint64_t)(cp)[1] << 48) | ((uint64_t)(cp)[0] << 56);	\
  } while (0)
  
  #define BE_64_TO_8(cp, src) do {					\
  	(cp)[0] = (src) >> 56;						\
          (cp)[1] = (src) >> 48;						\
  	(cp)[2] = (src) >> 40;						\
  	(cp)[3] = (src) >> 32;						\
  	(cp)[4] = (src) >> 24;						\
  	(cp)[5] = (src) >> 16;						\
  	(cp)[6] = (src) >> 8;						\
  	(cp)[7] = (src);						\
  } while (0)
  
  #define BE_32_TO_8(cp, src) do {					\
  	(cp)[0] = (src) >> 24;						\
  	(cp)[1] = (src) >> 16;						\
  	(cp)[2] = (src) >> 8;						\
  	(cp)[3] = (src);						\
  } while (0)
  
  /*
   * Macro for incrementally adding the unsigned 64-bit integer n to the
   * unsigned 128-bit integer (represented using a two-element array of
   * 64-bit words):
   */
  #define ADDINC128(w,n) do {						\
  	(w)[0] += (uint64_t)(n);					\
  	if ((w)[0] < (n)) {						\
  		(w)[1]++;						\
  	}								\
  } while (0)
  
  /*** THE SIX LOGICAL FUNCTIONS ****************************************/
  /*
   * Bit shifting and rotation (used by the six SHA-XYZ logical functions:
   *
   *   NOTE:  The naming of R and S appears backwards here (R is a SHIFT and
   *   S is a ROTATION) because the SHA-224/256/384/512 description document
   *   (see http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf) uses this
   *   same "backwards" definition.
   */
  /* Shift-right (used in SHA-224, SHA-256, SHA-384, and SHA-512): */
  #define R(b,x) 		((x) >> (b))
  /* 32-bit Rotate-right (used in SHA-224 and SHA-256): */
  #define S32(b,x)	(((x) >> (b)) | ((x) << (32 - (b))))
  /* 64-bit Rotate-right (used in SHA-384 and SHA-512): */
  #define S64(b,x)	(((x) >> (b)) | ((x) << (64 - (b))))
  
  /* Two of six logical functions used in SHA-224, SHA-256, SHA-384, and SHA-512: */
  #define Ch(x,y,z)	(((x) & (y)) ^ ((~(x)) & (z)))
  #define Maj(x,y,z)	(((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
  
  /* Four of six logical functions used in SHA-224 and SHA-256: */
  #define Sigma0_256(x)	(S32(2,  (x)) ^ S32(13, (x)) ^ S32(22, (x)))
  #define Sigma1_256(x)	(S32(6,  (x)) ^ S32(11, (x)) ^ S32(25, (x)))
  #define sigma0_256(x)	(S32(7,  (x)) ^ S32(18, (x)) ^ R(3 ,   (x)))
  #define sigma1_256(x)	(S32(17, (x)) ^ S32(19, (x)) ^ R(10,   (x)))
  
  /* Four of six logical functions used in SHA-384 and SHA-512: */
  #define Sigma0_512(x)	(S64(28, (x)) ^ S64(34, (x)) ^ S64(39, (x)))
  #define Sigma1_512(x)	(S64(14, (x)) ^ S64(18, (x)) ^ S64(41, (x)))
  #define sigma0_512(x)	(S64( 1, (x)) ^ S64( 8, (x)) ^ R( 7,   (x)))
  #define sigma1_512(x)	(S64(19, (x)) ^ S64(61, (x)) ^ R( 6,   (x)))
  
  
  /*** SHA-XYZ INITIAL HASH VALUES AND CONSTANTS ************************/
  /* Hash constant words K for SHA-224 and SHA-256: */
  static const uint32_t K256[64] = {
  	0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL,
  	0x3956c25bUL, 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL,
  	0xd807aa98UL, 0x12835b01UL, 0x243185beUL, 0x550c7dc3UL,
  	0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL, 0xc19bf174UL,
  	0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
  	0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL,
  	0x983e5152UL, 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL,
  	0xc6e00bf3UL, 0xd5a79147UL, 0x06ca6351UL, 0x14292967UL,
  	0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL, 0x53380d13UL,
  	0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
  	0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL,
  	0xd192e819UL, 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL,
  	0x19a4c116UL, 0x1e376c08UL, 0x2748774cUL, 0x34b0bcb5UL,
  	0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL, 0x682e6ff3UL,
  	0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
  	0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL
  };
  
  /* Initial hash value H for SHA-256: */
  static const uint32_t sha256_initial_hash_value[8] = {
  	0x6a09e667UL,
  	0xbb67ae85UL,
  	0x3c6ef372UL,
  	0xa54ff53aUL,
  	0x510e527fUL,
  	0x9b05688cUL,
  	0x1f83d9abUL,
  	0x5be0cd19UL
  };
  
  /* Hash constant words K for SHA-384 and SHA-512: */
  static const uint64_t K512[80] = {
  	0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL,
  	0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL,
  	0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
  	0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL,
  	0xd807aa98a3030242ULL, 0x12835b0145706fbeULL,
  	0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
  	0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL,
  	0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL,
  	0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
  	0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL,
  	0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL,
  	0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
  	0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL,
  	0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL,
  	0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
  	0x06ca6351e003826fULL, 0x142929670a0e6e70ULL,
  	0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL,
  	0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
  	0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL,
  	0x81c2c92e47edaee6ULL, 0x92722c851482353bULL,
  	0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
  	0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL,
  	0xd192e819d6ef5218ULL, 0xd69906245565a910ULL,
  	0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
  	0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL,
  	0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL,
  	0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
  	0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL,
  	0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL,
  	0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
  	0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL,
  	0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL,
  	0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
  	0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL,
  	0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL,
  	0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
  	0x28db77f523047d84ULL, 0x32caab7b40c72493ULL,
  	0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL,
  	0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
  	0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL
  };
  
  /* Initial hash value H for SHA-512 */
  static const uint64_t sha512_initial_hash_value[8] = {
  	0x6a09e667f3bcc908ULL,
  	0xbb67ae8584caa73bULL,
  	0x3c6ef372fe94f82bULL,
  	0xa54ff53a5f1d36f1ULL,
  	0x510e527fade682d1ULL,
  	0x9b05688c2b3e6c1fULL,
  	0x1f83d9abfb41bd6bULL,
  	0x5be0cd19137e2179ULL
  };
  
  #if !defined(SHA2_SMALL)
  /* Initial hash value H for SHA-224: */
  static const uint32_t sha224_initial_hash_value[8] = {
  	0xc1059ed8UL,
  	0x367cd507UL,
  	0x3070dd17UL,
  	0xf70e5939UL,
  	0xffc00b31UL,
  	0x68581511UL,
  	0x64f98fa7UL,
  	0xbefa4fa4UL
  };
  
  /* Initial hash value H for SHA-384 */
  static const uint64_t sha384_initial_hash_value[8] = {
  	0xcbbb9d5dc1059ed8ULL,
  	0x629a292a367cd507ULL,
  	0x9159015a3070dd17ULL,
  	0x152fecd8f70e5939ULL,
  	0x67332667ffc00b31ULL,
  	0x8eb44a8768581511ULL,
  	0xdb0c2e0d64f98fa7ULL,
  	0x47b5481dbefa4fa4ULL
  };
  
  /* Initial hash value H for SHA-512-256 */
  static const uint64_t sha512_256_initial_hash_value[8] = {
  	0x22312194fc2bf72cULL,
  	0x9f555fa3c84c64c2ULL,
  	0x2393b86b6f53b151ULL,
  	0x963877195940eabdULL,
  	0x96283ee2a88effe3ULL,
  	0xbe5e1e2553863992ULL,
  	0x2b0199fc2c85b8aaULL,
  	0x0eb72ddc81c52ca2ULL
  };
  
  /*** SHA-224: *********************************************************/
  void
  SHA224Init(SHA2_CTX *context)
  {
  	memcpy(context->state.st32, sha224_initial_hash_value,
  	    sizeof(sha224_initial_hash_value));
  	memset(context->buffer, 0, sizeof(context->buffer));
  	context->bitcount[0] = 0;
  }
  
  #ifdef libmd_strong_alias
  libmd_strong_alias(SHA224Transform, SHA256Transform);
  libmd_strong_alias(SHA224Update, SHA256Update);
  libmd_strong_alias(SHA224Pad, SHA256Pad);
  #else
  void
  SHA224Transform(uint64_t state[8], const uint8_t data[SHA256_BLOCK_LENGTH])
  {
  	SHA256Transform(state, data);
  }
  
  void
  SHA224Update(SHA2_CTX *context, const uint8_t *data, size_t len)
  {
  	SHA256Update(context, data, len);
  }
  
  void
  SHA224Pad(SHA2_CTX *context)
  {
  	SHA256Pad(context);
  }
  #endif
  
  void
  SHA224Final(uint8_t digest[SHA224_DIGEST_LENGTH], SHA2_CTX *context)
  {
  #ifndef WORDS_BIGENDIAN
  	int	i;
  #endif
  
  	SHA224Pad(context);
  
  #ifndef WORDS_BIGENDIAN
  	/* Convert TO host byte order */
  	for (i = 0; i < 7; i++)
  		BE_32_TO_8(digest + i * 4, context->state.st32[i]);
  #else
  	memcpy(digest, context->state.st32, SHA224_DIGEST_LENGTH);
  #endif
  	memset(context, 0, sizeof(*context));
  }
  #endif /* !defined(SHA2_SMALL) */
  
  /*** SHA-256: *********************************************************/
  void
  SHA256Init(SHA2_CTX *context)
  {
  	memcpy(context->state.st32, sha256_initial_hash_value,
  	    sizeof(sha256_initial_hash_value));
  	memset(context->buffer, 0, sizeof(context->buffer));
  	context->bitcount[0] = 0;
  }
  
  #ifdef SHA2_UNROLL_TRANSFORM
  
  /* Unrolled SHA-256 round macros: */
  
  #define ROUND256_0_TO_15(a,b,c,d,e,f,g,h) do {				    \
  	BE_8_TO_32(W256[j], data);					    \
  	data += 4;							    \
  	T1 = (h) + Sigma1_256((e)) + Ch((e), (f), (g)) + K256[j] + W256[j]; \
  	(d) += T1;							    \
  	(h) = T1 + Sigma0_256((a)) + Maj((a), (b), (c));		    \
  	j++;								    \
  } while(0)
  
  #define ROUND256(a,b,c,d,e,f,g,h) do {					    \
  	s0 = W256[(j+1)&0x0f];						    \
  	s0 = sigma0_256(s0);						    \
  	s1 = W256[(j+14)&0x0f];						    \
  	s1 = sigma1_256(s1);						    \
  	T1 = (h) + Sigma1_256((e)) + Ch((e), (f), (g)) + K256[j] +	    \
  	     (W256[j&0x0f] += s1 + W256[(j+9)&0x0f] + s0);		    \
  	(d) += T1;							    \
  	(h) = T1 + Sigma0_256((a)) + Maj((a), (b), (c));		    \
  	j++;								    \
  } while(0)
  
  void
  SHA256Transform(uint32_t state[8], const uint8_t data[SHA256_BLOCK_LENGTH])
  {
  	uint32_t	a, b, c, d, e, f, g, h, s0, s1;
  	uint32_t	T1, W256[16];
  	int		j;
  
  	/* Initialize registers with the prev. intermediate value */
  	a = state[0];
  	b = state[1];
  	c = state[2];
  	d = state[3];
  	e = state[4];
  	f = state[5];
  	g = state[6];
  	h = state[7];
  
  	j = 0;
  	do {
  		/* Rounds 0 to 15 (unrolled): */
  		ROUND256_0_TO_15(a,b,c,d,e,f,g,h);
  		ROUND256_0_TO_15(h,a,b,c,d,e,f,g);
  		ROUND256_0_TO_15(g,h,a,b,c,d,e,f);
  		ROUND256_0_TO_15(f,g,h,a,b,c,d,e);
  		ROUND256_0_TO_15(e,f,g,h,a,b,c,d);
  		ROUND256_0_TO_15(d,e,f,g,h,a,b,c);
  		ROUND256_0_TO_15(c,d,e,f,g,h,a,b);
  		ROUND256_0_TO_15(b,c,d,e,f,g,h,a);
  	} while (j < 16);
  
  	/* Now for the remaining rounds up to 63: */
  	do {
  		ROUND256(a,b,c,d,e,f,g,h);
  		ROUND256(h,a,b,c,d,e,f,g);
  		ROUND256(g,h,a,b,c,d,e,f);
  		ROUND256(f,g,h,a,b,c,d,e);
  		ROUND256(e,f,g,h,a,b,c,d);
  		ROUND256(d,e,f,g,h,a,b,c);
  		ROUND256(c,d,e,f,g,h,a,b);
  		ROUND256(b,c,d,e,f,g,h,a);
  	} while (j < 64);
  
  	/* Compute the current intermediate hash value */
  	state[0] += a;
  	state[1] += b;
  	state[2] += c;
  	state[3] += d;
  	state[4] += e;
  	state[5] += f;
  	state[6] += g;
  	state[7] += h;
  
  	/* Clean up */
  	a = b = c = d = e = f = g = h = T1 = 0;
  }
  
  #else /* SHA2_UNROLL_TRANSFORM */
  
  void
  SHA256Transform(uint32_t state[8], const uint8_t data[SHA256_BLOCK_LENGTH])
  {
  	uint32_t	a, b, c, d, e, f, g, h, s0, s1;
  	uint32_t	T1, T2, W256[16];
  	int		j;
  
  	/* Initialize registers with the prev. intermediate value */
  	a = state[0];
  	b = state[1];
  	c = state[2];
  	d = state[3];
  	e = state[4];
  	f = state[5];
  	g = state[6];
  	h = state[7];
  
  	j = 0;
  	do {
  		BE_8_TO_32(W256[j], data);
  		data += 4;
  		/* Apply the SHA-256 compression function to update a..h */
  		T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] + W256[j];
  		T2 = Sigma0_256(a) + Maj(a, b, c);
  		h = g;
  		g = f;
  		f = e;
  		e = d + T1;
  		d = c;
  		c = b;
  		b = a;
  		a = T1 + T2;
  
  		j++;
  	} while (j < 16);
  
  	do {
  		/* Part of the message block expansion: */
  		s0 = W256[(j+1)&0x0f];
  		s0 = sigma0_256(s0);
  		s1 = W256[(j+14)&0x0f];	
  		s1 = sigma1_256(s1);
  
  		/* Apply the SHA-256 compression function to update a..h */
  		T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] + 
  		     (W256[j&0x0f] += s1 + W256[(j+9)&0x0f] + s0);
  		T2 = Sigma0_256(a) + Maj(a, b, c);
  		h = g;
  		g = f;
  		f = e;
  		e = d + T1;
  		d = c;
  		c = b;
  		b = a;
  		a = T1 + T2;
  
  		j++;
  	} while (j < 64);
  
  	/* Compute the current intermediate hash value */
  	state[0] += a;
  	state[1] += b;
  	state[2] += c;
  	state[3] += d;
  	state[4] += e;
  	state[5] += f;
  	state[6] += g;
  	state[7] += h;
  
  	/* Clean up */
  	a = b = c = d = e = f = g = h = T1 = T2 = 0;
  }
  
  #endif /* SHA2_UNROLL_TRANSFORM */
  
  void
  SHA256Update(SHA2_CTX *context, const uint8_t *data, size_t len)
  {
  	size_t	freespace, usedspace;
  
  	/* Calling with no data is valid (we do nothing) */
  	if (len == 0)
  		return;
  
  	usedspace = (context->bitcount[0] >> 3) % SHA256_BLOCK_LENGTH;
  	if (usedspace > 0) {
  		/* Calculate how much free space is available in the buffer */
  		freespace = SHA256_BLOCK_LENGTH - usedspace;
  
  		if (len >= freespace) {
  			/* Fill the buffer completely and process it */
  			memcpy(&context->buffer[usedspace], data, freespace);
  			context->bitcount[0] += freespace << 3;
  			len -= freespace;
  			data += freespace;
  			SHA256Transform(context->state.st32, context->buffer);
  		} else {
  			/* The buffer is not yet full */
  			memcpy(&context->buffer[usedspace], data, len);
  			context->bitcount[0] += (uint64_t)len << 3;
  			/* Clean up: */
  			usedspace = freespace = 0;
  			return;
  		}
  	}
  	while (len >= SHA256_BLOCK_LENGTH) {
  		/* Process as many complete blocks as we can */
  		SHA256Transform(context->state.st32, data);
  		context->bitcount[0] += SHA256_BLOCK_LENGTH << 3;
  		len -= SHA256_BLOCK_LENGTH;
  		data += SHA256_BLOCK_LENGTH;
  	}
  	if (len > 0) {
  		/* There's left-overs, so save 'em */
  		memcpy(context->buffer, data, len);
  		context->bitcount[0] += len << 3;
  	}
  	/* Clean up: */
  	usedspace = freespace = 0;
  }
  
  void
  SHA256Pad(SHA2_CTX *context)
  {
  	unsigned int	usedspace;
  
  	usedspace = (context->bitcount[0] >> 3) % SHA256_BLOCK_LENGTH;
  	if (usedspace > 0) {
  		/* Begin padding with a 1 bit: */
  		context->buffer[usedspace++] = 0x80;
  
  		if (usedspace <= SHA256_SHORT_BLOCK_LENGTH) {
  			/* Set-up for the last transform: */
  			memset(&context->buffer[usedspace], 0,
  			    SHA256_SHORT_BLOCK_LENGTH - usedspace);
  		} else {
  			if (usedspace < SHA256_BLOCK_LENGTH) {
  				memset(&context->buffer[usedspace], 0,
  				    SHA256_BLOCK_LENGTH - usedspace);
  			}
  			/* Do second-to-last transform: */
  			SHA256Transform(context->state.st32, context->buffer);
  
  			/* Prepare for last transform: */
  			memset(context->buffer, 0, SHA256_SHORT_BLOCK_LENGTH);
  		}
  	} else {
  		/* Set-up for the last transform: */
  		memset(context->buffer, 0, SHA256_SHORT_BLOCK_LENGTH);
  
  		/* Begin padding with a 1 bit: */
  		*context->buffer = 0x80;
  	}
  	/* Store the length of input data (in bits) in big endian format: */
  	BE_64_TO_8(&context->buffer[SHA256_SHORT_BLOCK_LENGTH],
  	    context->bitcount[0]);
  
  	/* Final transform: */
  	SHA256Transform(context->state.st32, context->buffer);
  
  	/* Clean up: */
  	usedspace = 0;
  }
  
  void
  SHA256Final(uint8_t digest[SHA256_DIGEST_LENGTH], SHA2_CTX *context)
  {
  #ifndef WORDS_BIGENDIAN
  	int	i;
  #endif
  
  	SHA256Pad(context);
  
  #ifndef WORDS_BIGENDIAN
  	/* Convert TO host byte order */
  	for (i = 0; i < 8; i++)
  		BE_32_TO_8(digest + i * 4, context->state.st32[i]);
  #else
  	memcpy(digest, context->state.st32, SHA256_DIGEST_LENGTH);
  #endif
  	memset(context, 0, sizeof(*context));
  }
  
  
  /*** SHA-512: *********************************************************/
  void
  SHA512Init(SHA2_CTX *context)
  {
  	memcpy(context->state.st64, sha512_initial_hash_value,
  	    sizeof(sha512_initial_hash_value));
  	memset(context->buffer, 0, sizeof(context->buffer));
  	context->bitcount[0] = context->bitcount[1] =  0;
  }
  
  #ifdef SHA2_UNROLL_TRANSFORM
  
  /* Unrolled SHA-512 round macros: */
  
  #define ROUND512_0_TO_15(a,b,c,d,e,f,g,h) do {				    \
  	BE_8_TO_64(W512[j], data);					    \
  	data += 8;							    \
  	T1 = (h) + Sigma1_512((e)) + Ch((e), (f), (g)) + K512[j] + W512[j]; \
  	(d) += T1;							    \
  	(h) = T1 + Sigma0_512((a)) + Maj((a), (b), (c));		    \
  	j++;								    \
  } while(0)
  
  
  #define ROUND512(a,b,c,d,e,f,g,h) do {					    \
  	s0 = W512[(j+1)&0x0f];						    \
  	s0 = sigma0_512(s0);						    \
  	s1 = W512[(j+14)&0x0f];						    \
  	s1 = sigma1_512(s1);						    \
  	T1 = (h) + Sigma1_512((e)) + Ch((e), (f), (g)) + K512[j] +	    \
               (W512[j&0x0f] += s1 + W512[(j+9)&0x0f] + s0);		    \
  	(d) += T1;							    \
  	(h) = T1 + Sigma0_512((a)) + Maj((a), (b), (c));		    \
  	j++;								    \
  } while(0)
  
  void
  SHA512Transform(uint64_t state[8], const uint8_t data[SHA512_BLOCK_LENGTH])
  {
  	uint64_t	a, b, c, d, e, f, g, h, s0, s1;
  	uint64_t	T1, W512[16];
  	int		j;
  
  	/* Initialize registers with the prev. intermediate value */
  	a = state[0];
  	b = state[1];
  	c = state[2];
  	d = state[3];
  	e = state[4];
  	f = state[5];
  	g = state[6];
  	h = state[7];
  
  	j = 0;
  	do {
  		/* Rounds 0 to 15 (unrolled): */
  		ROUND512_0_TO_15(a,b,c,d,e,f,g,h);
  		ROUND512_0_TO_15(h,a,b,c,d,e,f,g);
  		ROUND512_0_TO_15(g,h,a,b,c,d,e,f);
  		ROUND512_0_TO_15(f,g,h,a,b,c,d,e);
  		ROUND512_0_TO_15(e,f,g,h,a,b,c,d);
  		ROUND512_0_TO_15(d,e,f,g,h,a,b,c);
  		ROUND512_0_TO_15(c,d,e,f,g,h,a,b);
  		ROUND512_0_TO_15(b,c,d,e,f,g,h,a);
  	} while (j < 16);
  
  	/* Now for the remaining rounds up to 79: */
  	do {
  		ROUND512(a,b,c,d,e,f,g,h);
  		ROUND512(h,a,b,c,d,e,f,g);
  		ROUND512(g,h,a,b,c,d,e,f);
  		ROUND512(f,g,h,a,b,c,d,e);
  		ROUND512(e,f,g,h,a,b,c,d);
  		ROUND512(d,e,f,g,h,a,b,c);
  		ROUND512(c,d,e,f,g,h,a,b);
  		ROUND512(b,c,d,e,f,g,h,a);
  	} while (j < 80);
  
  	/* Compute the current intermediate hash value */
  	state[0] += a;
  	state[1] += b;
  	state[2] += c;
  	state[3] += d;
  	state[4] += e;
  	state[5] += f;
  	state[6] += g;
  	state[7] += h;
  
  	/* Clean up */
  	a = b = c = d = e = f = g = h = T1 = 0;
  }
  
  #else /* SHA2_UNROLL_TRANSFORM */
  
  void
  SHA512Transform(uint64_t state[8], const uint8_t data[SHA512_BLOCK_LENGTH])
  {
  	uint64_t	a, b, c, d, e, f, g, h, s0, s1;
  	uint64_t	T1, T2, W512[16];
  	int		j;
  
  	/* Initialize registers with the prev. intermediate value */
  	a = state[0];
  	b = state[1];
  	c = state[2];
  	d = state[3];
  	e = state[4];
  	f = state[5];
  	g = state[6];
  	h = state[7];
  
  	j = 0;
  	do {
  		BE_8_TO_64(W512[j], data);
  		data += 8;
  		/* Apply the SHA-512 compression function to update a..h */
  		T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] + W512[j];
  		T2 = Sigma0_512(a) + Maj(a, b, c);
  		h = g;
  		g = f;
  		f = e;
  		e = d + T1;
  		d = c;
  		c = b;
  		b = a;
  		a = T1 + T2;
  
  		j++;
  	} while (j < 16);
  
  	do {
  		/* Part of the message block expansion: */
  		s0 = W512[(j+1)&0x0f];
  		s0 = sigma0_512(s0);
  		s1 = W512[(j+14)&0x0f];
  		s1 =  sigma1_512(s1);
  
  		/* Apply the SHA-512 compression function to update a..h */
  		T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] +
  		     (W512[j&0x0f] += s1 + W512[(j+9)&0x0f] + s0);
  		T2 = Sigma0_512(a) + Maj(a, b, c);
  		h = g;
  		g = f;
  		f = e;
  		e = d + T1;
  		d = c;
  		c = b;
  		b = a;
  		a = T1 + T2;
  
  		j++;
  	} while (j < 80);
  
  	/* Compute the current intermediate hash value */
  	state[0] += a;
  	state[1] += b;
  	state[2] += c;
  	state[3] += d;
  	state[4] += e;
  	state[5] += f;
  	state[6] += g;
  	state[7] += h;
  
  	/* Clean up */
  	a = b = c = d = e = f = g = h = T1 = T2 = 0;
  }
  
  #endif /* SHA2_UNROLL_TRANSFORM */
  
  void
  SHA512Update(SHA2_CTX *context, const uint8_t *data, size_t len)
  {
  	size_t	freespace, usedspace;
  
  	/* Calling with no data is valid (we do nothing) */
  	if (len == 0)
  		return;
  
  	usedspace = (context->bitcount[0] >> 3) % SHA512_BLOCK_LENGTH;
  	if (usedspace > 0) {
  		/* Calculate how much free space is available in the buffer */
  		freespace = SHA512_BLOCK_LENGTH - usedspace;
  
  		if (len >= freespace) {
  			/* Fill the buffer completely and process it */
  			memcpy(&context->buffer[usedspace], data, freespace);
  			ADDINC128(context->bitcount, freespace << 3);
  			len -= freespace;
  			data += freespace;
  			SHA512Transform(context->state.st64, context->buffer);
  		} else {
  			/* The buffer is not yet full */
  			memcpy(&context->buffer[usedspace], data, len);
  			ADDINC128(context->bitcount, len << 3);
  			/* Clean up: */
  			usedspace = freespace = 0;
  			return;
  		}
  	}
  	while (len >= SHA512_BLOCK_LENGTH) {
  		/* Process as many complete blocks as we can */
  		SHA512Transform(context->state.st64, data);
  		ADDINC128(context->bitcount, SHA512_BLOCK_LENGTH << 3);
  		len -= SHA512_BLOCK_LENGTH;
  		data += SHA512_BLOCK_LENGTH;
  	}
  	if (len > 0) {
  		/* There's left-overs, so save 'em */
  		memcpy(context->buffer, data, len);
  		ADDINC128(context->bitcount, len << 3);
  	}
  	/* Clean up: */
  	usedspace = freespace = 0;
  }
  
  void
  SHA512Pad(SHA2_CTX *context)
  {
  	unsigned int	usedspace;
  
  	usedspace = (context->bitcount[0] >> 3) % SHA512_BLOCK_LENGTH;
  	if (usedspace > 0) {
  		/* Begin padding with a 1 bit: */
  		context->buffer[usedspace++] = 0x80;
  
  		if (usedspace <= SHA512_SHORT_BLOCK_LENGTH) {
  			/* Set-up for the last transform: */
  			memset(&context->buffer[usedspace], 0, SHA512_SHORT_BLOCK_LENGTH - usedspace);
  		} else {
  			if (usedspace < SHA512_BLOCK_LENGTH) {
  				memset(&context->buffer[usedspace], 0, SHA512_BLOCK_LENGTH - usedspace);
  			}
  			/* Do second-to-last transform: */
  			SHA512Transform(context->state.st64, context->buffer);
  
  			/* And set-up for the last transform: */
  			memset(context->buffer, 0, SHA512_BLOCK_LENGTH - 2);
  		}
  	} else {
  		/* Prepare for final transform: */
  		memset(context->buffer, 0, SHA512_SHORT_BLOCK_LENGTH);
  
  		/* Begin padding with a 1 bit: */
  		*context->buffer = 0x80;
  	}
  	/* Store the length of input data (in bits) in big endian format: */
  	BE_64_TO_8(&context->buffer[SHA512_SHORT_BLOCK_LENGTH],
  	    context->bitcount[1]);
  	BE_64_TO_8(&context->buffer[SHA512_SHORT_BLOCK_LENGTH + 8],
  	    context->bitcount[0]);
  
  	/* Final transform: */
  	SHA512Transform(context->state.st64, context->buffer);
  
  	/* Clean up: */
  	usedspace = 0;
  }
  
  void
  SHA512Final(uint8_t digest[SHA512_DIGEST_LENGTH], SHA2_CTX *context)
  {
  #ifndef WORDS_BIGENDIAN
  	int	i;
  #endif
  
  	SHA512Pad(context);
  
  #ifndef WORDS_BIGENDIAN
  	/* Convert TO host byte order */
  	for (i = 0; i < 8; i++)
  		BE_64_TO_8(digest + i * 8, context->state.st64[i]);
  #else
  	memcpy(digest, context->state.st64, SHA512_DIGEST_LENGTH);
  #endif
  	memset(context, 0, sizeof(*context));
  }
  
  #if !defined(SHA2_SMALL)
  
  /*** SHA-384: *********************************************************/
  void
  SHA384Init(SHA2_CTX *context)
  {
  	memcpy(context->state.st64, sha384_initial_hash_value,
  	    sizeof(sha384_initial_hash_value));
  	memset(context->buffer, 0, sizeof(context->buffer));
  	context->bitcount[0] = context->bitcount[1] = 0;
  }
  
  #ifdef libmd_strong_alias
  libmd_strong_alias(SHA384Transform, SHA512Transform);
  libmd_strong_alias(SHA384Update, SHA512Update);
  libmd_strong_alias(SHA384Pad, SHA512Pad);
  #else
  void
  SHA384Transform(uint64_t state[8], const uint8_t data[SHA512_BLOCK_LENGTH])
  {
  	SHA512Transform(state, data);
  }
  
  void
  SHA384Update(SHA2_CTX *context, const uint8_t *data, size_t len)
  {
  	SHA512Update(context, data, len);
  }
  
  void
  SHA384Pad(SHA2_CTX *context)
  {
  	SHA512Pad(context);
  }
  #endif
  
  void
  SHA384Final(uint8_t digest[SHA384_DIGEST_LENGTH], SHA2_CTX *context)
  {
  #ifndef WORDS_BIGENDIAN
  	int	i;
  #endif
  
  	SHA384Pad(context);
  
  #ifndef WORDS_BIGENDIAN
  	/* Convert TO host byte order */
  	for (i = 0; i < 6; i++)
  		BE_64_TO_8(digest + i * 8, context->state.st64[i]);
  #else
  	memcpy(digest, context->state.st64, SHA384_DIGEST_LENGTH);
  #endif
  	/* Zero out state data */
  	memset(context, 0, sizeof(*context));
  }
  
  /*** SHA-512/256: *********************************************************/
  void
  SHA512_256Init(SHA2_CTX *context)
  {
  	memcpy(context->state.st64, sha512_256_initial_hash_value,
  	    sizeof(sha512_256_initial_hash_value));
  	memset(context->buffer, 0, sizeof(context->buffer));
  	context->bitcount[0] = context->bitcount[1] = 0;
  }
  
  #ifdef libmd_strong_alias
  libmd_strong_alias(SHA512_256Transform, SHA512Transform);
  libmd_strong_alias(SHA512_256Update, SHA512Update);
  libmd_strong_alias(SHA512_256Pad, SHA512Pad);
  #else
  void
  SHA512_256Transform(uint64_t state[8], const uint8_t data[SHA512_256_BLOCK_LENGTH])
  {
  	SHA512Transform(state, data);
  }
  
  void
  SHA512_256Update(SHA2_CTX *context, const uint8_t *data, size_t len)
  {
  	SHA512Update(context, data, len);
  }
  
  void
  SHA512_256Pad(SHA2_CTX *context)
  {
  	SHA512Pad(context);
  }
  #endif
  
  void
  SHA512_256Final(uint8_t digest[SHA512_256_DIGEST_LENGTH], SHA2_CTX *context)
  {
  #ifndef WORDS_BIGENDIAN
  	int	i;
  #endif
  
  	SHA512_256Pad(context);
  
  #ifndef WORDS_BIGENDIAN
  	/* Convert TO host byte order */
  	for (i = 0; i < 4; i++)
  		BE_64_TO_8(digest + i * 8, context->state.st64[i]);
  #else
  	memcpy(digest, context->state.st64, SHA512_256_DIGEST_LENGTH);
  #endif
  	/* Zero out state data */
  	memset(context, 0, sizeof(*context));
  }
  #endif /* !defined(SHA2_SMALL) */
  

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