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sha2.c

/* $Id: sha2.c,v 1.6 2004/09/21 14:35:25 ludvigm Exp $ */

/*
 * sha2.c
 *
 * Version 1.0.0beta1
 *
 * Written by Aaron D. Gifford <me@aarongifford.com>
 *
 * Copyright 2000 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(S) 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(S) 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.
 *
 */

#include "config.h"

#include <sys/types.h>
#include <sys/time.h>
#ifndef __linux__
#include <machine/endian.h>
#endif
#include <crypto/sha2/sha2.h>
#include <openssl/evp.h>

/* get openssl/ssleay version number */
#include <openssl/opensslv.h>

#include <err.h>
#include <string.h>
#define bcopy(a, b, c) memcpy((b), (a), (c))
#define bzero(a, b) memset((a), 0, (b))
#define panic(a) err(1, (a))

#if OPENSSL_VERSION_NUMBER >= 0x00907000L
#define HAVE_EVP_097
#endif

/*
 * ASSERT NOTE:
 * Some sanity checking code is included using assert().  On my FreeBSD
 * system, this additional code can be removed by compiling with NDEBUG
 * defined.  Check your own systems manpage on assert() to see how to
 * compile WITHOUT the sanity checking code on your system.
 *
 * 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
 *
 */

#define assert(x)


/*** SHA-256/384/512 Machine Architecture Definitions *****************/
/*
 * BYTE_ORDER NOTE:
 *
 * Please make sure that your system defines BYTE_ORDER.  If your
 * architecture is little-endian, make sure it also defines
 * LITTLE_ENDIAN and that the two (BYTE_ORDER and LITTLE_ENDIAN) are
 * equivilent.
 *
 * If your system does not define the above, then you can do so by
 * hand like this:
 *
 *   #define LITTLE_ENDIAN 1234
 *   #define BIG_ENDIAN    4321
 *
 * And for little-endian machines, add:
 *
 *   #define BYTE_ORDER LITTLE_ENDIAN 
 *
 * Or for big-endian machines:
 *
 *   #define BYTE_ORDER BIG_ENDIAN
 *
 * The FreeBSD machine this was written on defines BYTE_ORDER
 * appropriately by including <sys/types.h> (which in turn includes
 * <machine/endian.h> where the appropriate definitions are actually
 * made).
 */
#if !defined(BYTE_ORDER) || (BYTE_ORDER != LITTLE_ENDIAN && BYTE_ORDER != BIG_ENDIAN)
#error Define BYTE_ORDER to be equal to either LITTLE_ENDIAN or BIG_ENDIAN
#endif

/*
 * Define the followingsha2_* types to types of the correct length on
 * the native archtecture.   Most BSD systems and Linux define u_intXX_t
 * types.  Machines with very recent ANSI C headers, can use the
 * uintXX_t definintions from inttypes.h by defining SHA2_USE_INTTYPES_H
 * during compile or in the sha.h header file.
 *
 * Machines that support neither u_intXX_t nor inttypes.h's uintXX_t
 * will need to define these three typedefs below (and the appropriate
 * ones in sha.h too) by hand according to their system architecture.
 *
 * Thank you, Jun-ichiro itojun Hagino, for suggesting using u_intXX_t
 * types and pointing out recent ANSI C support for uintXX_t in inttypes.h.
 */
#if 0 /*def SHA2_USE_INTTYPES_H*/

typedef uint8_t  sha2_byte;   /* Exactly 1 byte */
typedef uint32_t sha2_word32; /* Exactly 4 bytes */
typedef uint64_t sha2_word64; /* Exactly 8 bytes */

#else /* SHA2_USE_INTTYPES_H */

typedef u_int8_t  sha2_byte;  /* Exactly 1 byte */
typedef u_int32_t sha2_word32;      /* Exactly 4 bytes */
typedef u_int64_t sha2_word64;      /* Exactly 8 bytes */

#endif /* SHA2_USE_INTTYPES_H */


/*** SHA-256/384/512 Various Length Definitions ***********************/
/* NOTE: Most of these are in sha2.h */
#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 REVERSAL MACROS *******************************************/
#if BYTE_ORDER == LITTLE_ENDIAN
#define REVERSE32(w,x)  { \
      sha2_word32 tmp = (w); \
      tmp = (tmp >> 16) | (tmp << 16); \
      (x) = ((tmp & 0xff00ff00UL) >> 8) | ((tmp & 0x00ff00ffUL) << 8); \
}
#define REVERSE64(w,x)  { \
      sha2_word64 tmp = (w); \
      tmp = (tmp >> 32) | (tmp << 32); \
      tmp = ((tmp & 0xff00ff00ff00ff00ULL) >> 8) | \
            ((tmp & 0x00ff00ff00ff00ffULL) << 8); \
      (x) = ((tmp & 0xffff0000ffff0000ULL) >> 16) | \
            ((tmp & 0x0000ffff0000ffffULL) << 16); \
}
#endif /* BYTE_ORDER == LITTLE_ENDIAN */

/*
 * 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)  { \
      (w)[0] += (sha2_word64)(n); \
      if ((w)[0] < (n)) { \
            (w)[1]++; \
      } \
}

/*** 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-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-256, SHA-384, and SHA-512): */
#define R(b,x)          ((x) >> (b))
/* 32-bit Rotate-right (used in 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-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-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)))

/*** INTERNAL FUNCTION PROTOTYPES *************************************/
/* NOTE: These should not be accessed directly from outside this
 * library -- they are intended for private internal visibility/use
 * only.
 */
void SHA512_Last(SHA512_CTX*);
void SHA256_Transform(SHA256_CTX*, const sha2_word32*);
void SHA512_Transform(SHA512_CTX*, const sha2_word64*);


/*** SHA-XYZ INITIAL HASH VALUES AND CONSTANTS ************************/
/* Hash constant words K for SHA-256: */
const static sha2_word32 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: */
const static sha2_word32 sha256_initial_hash_value[8] = {
      0x6a09e667UL,
      0xbb67ae85UL,
      0x3c6ef372UL,
      0xa54ff53aUL,
      0x510e527fUL,
      0x9b05688cUL,
      0x1f83d9abUL,
      0x5be0cd19UL
};

/* Hash constant words K for SHA-384 and SHA-512: */
const static sha2_word64 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-384 */
const static sha2_word64 sha384_initial_hash_value[8] = {
      0xcbbb9d5dc1059ed8ULL,
      0x629a292a367cd507ULL,
      0x9159015a3070dd17ULL,
      0x152fecd8f70e5939ULL,
      0x67332667ffc00b31ULL,
      0x8eb44a8768581511ULL,
      0xdb0c2e0d64f98fa7ULL,
      0x47b5481dbefa4fa4ULL
};

/* Initial hash value H for SHA-512 */
const static sha2_word64 sha512_initial_hash_value[8] = {
      0x6a09e667f3bcc908ULL,
      0xbb67ae8584caa73bULL,
      0x3c6ef372fe94f82bULL,
      0xa54ff53a5f1d36f1ULL,
      0x510e527fade682d1ULL,
      0x9b05688c2b3e6c1fULL,
      0x1f83d9abfb41bd6bULL,
      0x5be0cd19137e2179ULL
};

/*
 * Constant used by SHA256/384/512_End() functions for converting the
 * digest to a readable hexadecimal character string:
 */
static const char *sha2_hex_digits = "0123456789abcdef";


/*** SHA-256: *********************************************************/
void SHA256_Init(SHA256_CTX* context) {
      if (context == (SHA256_CTX*)0) {
            return;
      }
      bcopy(sha256_initial_hash_value, context->state, SHA256_DIGEST_LENGTH);
      bzero(context->buffer, SHA256_BLOCK_LENGTH);
      context->bitcount = 0;
}

#ifdef SHA2_UNROLL_TRANSFORM

/* Unrolled SHA-256 round macros: */

#if BYTE_ORDER == LITTLE_ENDIAN

#define ROUND256_0_TO_15(a,b,c,d,e,f,g,h) \
      REVERSE32(*data++, W256[j]); \
      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++


#else /* BYTE_ORDER == LITTLE_ENDIAN */

#define ROUND256_0_TO_15(a,b,c,d,e,f,g,h) \
      T1 = (h) + Sigma1_256(e) + Ch((e), (f), (g)) + \
           K256[j] + (W256[j] = *data++); \
      (d) += T1; \
      (h) = T1 + Sigma0_256(a) + Maj((a), (b), (c)); \
      j++

#endif /* BYTE_ORDER == LITTLE_ENDIAN */

#define ROUND256(a,b,c,d,e,f,g,h)   \
      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++

void SHA256_Transform(SHA256_CTX* context, const sha2_word32* data) {
      sha2_word32 a, b, c, d, e, f, g, h, s0, s1;
      sha2_word32 T1, *W256;
      int         j;

      W256 = (sha2_word32*)context->buffer;

      /* Initialize registers with the prev. intermediate value */
      a = context->state[0];
      b = context->state[1];
      c = context->state[2];
      d = context->state[3];
      e = context->state[4];
      f = context->state[5];
      g = context->state[6];
      h = context->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 to 64: */
      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 */
      context->state[0] += a;
      context->state[1] += b;
      context->state[2] += c;
      context->state[3] += d;
      context->state[4] += e;
      context->state[5] += f;
      context->state[6] += g;
      context->state[7] += h;

      /* Clean up */
      a = b = c = d = e = f = g = h = T1 = 0;
}

#else /* SHA2_UNROLL_TRANSFORM */

void SHA256_Transform(SHA256_CTX* context, const sha2_word32* data) {
      sha2_word32 a, b, c, d, e, f, g, h, s0, s1;
      sha2_word32 T1, T2, *W256;
      int         j;

      W256 = (sha2_word32*)context->buffer;

      /* Initialize registers with the prev. intermediate value */
      a = context->state[0];
      b = context->state[1];
      c = context->state[2];
      d = context->state[3];
      e = context->state[4];
      f = context->state[5];
      g = context->state[6];
      h = context->state[7];

      j = 0;
      do {
#if BYTE_ORDER == LITTLE_ENDIAN
            /* Copy data while converting to host byte order */
            REVERSE32(*data++,W256[j]);
            /* Apply the SHA-256 compression function to update a..h */
            T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] + W256[j];
#else /* BYTE_ORDER == LITTLE_ENDIAN */
            /* Apply the SHA-256 compression function to update a..h with copy */
            T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] + (W256[j] = *data++);
#endif /* BYTE_ORDER == LITTLE_ENDIAN */
            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 */
      context->state[0] += a;
      context->state[1] += b;
      context->state[2] += c;
      context->state[3] += d;
      context->state[4] += e;
      context->state[5] += f;
      context->state[6] += g;
      context->state[7] += h;

      /* Clean up */
      a = b = c = d = e = f = g = h = T1 = T2 = 0;
}

#endif /* SHA2_UNROLL_TRANSFORM */

void SHA256_Update(SHA256_CTX* context, const sha2_byte *data, size_t len) {
      unsigned int      freespace, usedspace;

      if (len == 0) {
            /* Calling with no data is valid - we do nothing */
            return;
      }

      /* Sanity check: */
      assert(context != (SHA256_CTX*)0 && data != (sha2_byte*)0);

      usedspace = (context->bitcount >> 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 */
                  bcopy(data, &context->buffer[usedspace], freespace);
                  context->bitcount += freespace << 3;
                  len -= freespace;
                  data += freespace;
                  SHA256_Transform(context, (sha2_word32*)context->buffer);
            } else {
                  /* The buffer is not yet full */
                  bcopy(data, &context->buffer[usedspace], len);
                  context->bitcount += len << 3;
                  /* Clean up: */
                  usedspace = freespace = 0;
                  return;
            }
      }
      while (len >= SHA256_BLOCK_LENGTH) {
            /* Process as many complete blocks as we can */
            SHA256_Transform(context, (const sha2_word32*)data);
            context->bitcount += SHA256_BLOCK_LENGTH << 3;
            len -= SHA256_BLOCK_LENGTH;
            data += SHA256_BLOCK_LENGTH;
      }
      if (len > 0) {
            /* There's left-overs, so save 'em */
            bcopy(data, context->buffer, len);
            context->bitcount += len << 3;
      }
      /* Clean up: */
      usedspace = freespace = 0;
}

void SHA256_Final(sha2_byte digest[], SHA256_CTX* context) {
      sha2_word32 *d = (sha2_word32*)digest;
      unsigned int      usedspace;

      /* Sanity check: */
      assert(context != (SHA256_CTX*)0);

      /* If no digest buffer is passed, we don't bother doing this: */
      if (digest != (sha2_byte*)0) {
            usedspace = (context->bitcount >> 3) % SHA256_BLOCK_LENGTH;
#if BYTE_ORDER == LITTLE_ENDIAN
            /* Convert FROM host byte order */
            REVERSE64(context->bitcount,context->bitcount);
#endif
            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: */
                        bzero(&context->buffer[usedspace], SHA256_SHORT_BLOCK_LENGTH - usedspace);
                  } else {
                        if (usedspace < SHA256_BLOCK_LENGTH) {
                              bzero(&context->buffer[usedspace], SHA256_BLOCK_LENGTH - usedspace);
                        }
                        /* Do second-to-last transform: */
                        SHA256_Transform(context, (sha2_word32*)context->buffer);

                        /* And set-up for the last transform: */
                        bzero(context->buffer, SHA256_SHORT_BLOCK_LENGTH);
                  }
            } else {
                  /* Set-up for the last transform: */
                  bzero(context->buffer, SHA256_SHORT_BLOCK_LENGTH);

                  /* Begin padding with a 1 bit: */
                  *context->buffer = 0x80;
            }
            /* Set the bit count: */
            *(sha2_word64*)&context->buffer[SHA256_SHORT_BLOCK_LENGTH] = context->bitcount;

            /* Final transform: */
            SHA256_Transform(context, (sha2_word32*)context->buffer);

#if BYTE_ORDER == LITTLE_ENDIAN
            {
                  /* Convert TO host byte order */
                  int   j;
                  for (j = 0; j < 8; j++) {
                        REVERSE32(context->state[j],context->state[j]);
                        *d++ = context->state[j];
                  }
            }
#else
            bcopy(context->state, d, SHA256_DIGEST_LENGTH);
#endif
      }

      /* Clean up state data: */
      bzero(context, sizeof(*context));
      usedspace = 0;
}

char *SHA256_End(SHA256_CTX* context, char buffer[]) {
      sha2_byte   digest[SHA256_DIGEST_LENGTH], *d = digest;
      int         i;

      /* Sanity check: */
      assert(context != (SHA256_CTX*)0);

      if (buffer != (char*)0) {
            SHA256_Final(digest, context);

            for (i = 0; i < SHA256_DIGEST_LENGTH; i++) {
                  *buffer++ = sha2_hex_digits[(*d & 0xf0) >> 4];
                  *buffer++ = sha2_hex_digits[*d & 0x0f];
                  d++;
            }
            *buffer = (char)0;
      } else {
            bzero(context, sizeof(*context));
      }
      bzero(digest, SHA256_DIGEST_LENGTH);
      return buffer;
}

char* SHA256_Data(const sha2_byte* data, size_t len, char digest[SHA256_DIGEST_STRING_LENGTH]) {
      SHA256_CTX  context;

      SHA256_Init(&context);
      SHA256_Update(&context, data, len);
      return SHA256_End(&context, digest);
}


/*** SHA-512: *********************************************************/
void SHA512_Init(SHA512_CTX* context) {
      if (context == (SHA512_CTX*)0) {
            return;
      }
      bcopy(sha512_initial_hash_value, context->state, SHA512_DIGEST_LENGTH);
      bzero(context->buffer, SHA512_BLOCK_LENGTH);
      context->bitcount[0] = context->bitcount[1] =  0;
}

#ifdef SHA2_UNROLL_TRANSFORM

/* Unrolled SHA-512 round macros: */
#if BYTE_ORDER == LITTLE_ENDIAN

#define ROUND512_0_TO_15(a,b,c,d,e,f,g,h) \
      REVERSE64(*data++, W512[j]); \
      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++


#else /* BYTE_ORDER == LITTLE_ENDIAN */

#define ROUND512_0_TO_15(a,b,c,d,e,f,g,h) \
      T1 = (h) + Sigma1_512(e) + Ch((e), (f), (g)) + \
             K512[j] + (W512[j] = *data++); \
      (d) += T1; \
      (h) = T1 + Sigma0_512(a) + Maj((a), (b), (c)); \
      j++

#endif /* BYTE_ORDER == LITTLE_ENDIAN */

#define ROUND512(a,b,c,d,e,f,g,h)   \
      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++

void SHA512_Transform(SHA512_CTX* context, const sha2_word64* data) {
      sha2_word64 a, b, c, d, e, f, g, h, s0, s1;
      sha2_word64 T1, *W512 = (sha2_word64*)context->buffer;
      int         j;

      /* Initialize registers with the prev. intermediate value */
      a = context->state[0];
      b = context->state[1];
      c = context->state[2];
      d = context->state[3];
      e = context->state[4];
      f = context->state[5];
      g = context->state[6];
      h = context->state[7];

      j = 0;
      do {
            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 */
      context->state[0] += a;
      context->state[1] += b;
      context->state[2] += c;
      context->state[3] += d;
      context->state[4] += e;
      context->state[5] += f;
      context->state[6] += g;
      context->state[7] += h;

      /* Clean up */
      a = b = c = d = e = f = g = h = T1 = 0;
}

#else /* SHA2_UNROLL_TRANSFORM */

void SHA512_Transform(SHA512_CTX* context, const sha2_word64* data) {
      sha2_word64 a, b, c, d, e, f, g, h, s0, s1;
      sha2_word64 T1, T2, *W512 = (sha2_word64*)context->buffer;
      int         j;

      /* Initialize registers with the prev. intermediate value */
      a = context->state[0];
      b = context->state[1];
      c = context->state[2];
      d = context->state[3];
      e = context->state[4];
      f = context->state[5];
      g = context->state[6];
      h = context->state[7];

      j = 0;
      do {
#if BYTE_ORDER == LITTLE_ENDIAN
            /* Convert TO host byte order */
            REVERSE64(*data++, W512[j]);
            /* Apply the SHA-512 compression function to update a..h */
            T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] + W512[j];
#else /* BYTE_ORDER == LITTLE_ENDIAN */
            /* Apply the SHA-512 compression function to update a..h with copy */
            T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] + (W512[j] = *data++);
#endif /* BYTE_ORDER == LITTLE_ENDIAN */
            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 */
      context->state[0] += a;
      context->state[1] += b;
      context->state[2] += c;
      context->state[3] += d;
      context->state[4] += e;
      context->state[5] += f;
      context->state[6] += g;
      context->state[7] += h;

      /* Clean up */
      a = b = c = d = e = f = g = h = T1 = T2 = 0;
}

#endif /* SHA2_UNROLL_TRANSFORM */

void SHA512_Update(SHA512_CTX* context, const sha2_byte *data, size_t len) {
      unsigned int      freespace, usedspace;

      if (len == 0) {
            /* Calling with no data is valid - we do nothing */
            return;
      }

      /* Sanity check: */
      assert(context != (SHA512_CTX*)0 && data != (sha2_byte*)0);

      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 */
                  bcopy(data, &context->buffer[usedspace], freespace);
                  ADDINC128(context->bitcount, freespace << 3);
                  len -= freespace;
                  data += freespace;
                  SHA512_Transform(context, (sha2_word64*)context->buffer);
            } else {
                  /* The buffer is not yet full */
                  bcopy(data, &context->buffer[usedspace], 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 */
            SHA512_Transform(context, (const sha2_word64*)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 */
            bcopy(data, context->buffer, len);
            ADDINC128(context->bitcount, len << 3);
      }
      /* Clean up: */
      usedspace = freespace = 0;
}

void SHA512_Last(SHA512_CTX* context) {
      unsigned int      usedspace;

      usedspace = (context->bitcount[0] >> 3) % SHA512_BLOCK_LENGTH;
#if BYTE_ORDER == LITTLE_ENDIAN
      /* Convert FROM host byte order */
      REVERSE64(context->bitcount[0],context->bitcount[0]);
      REVERSE64(context->bitcount[1],context->bitcount[1]);
#endif
      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: */
                  bzero(&context->buffer[usedspace], SHA512_SHORT_BLOCK_LENGTH - usedspace);
            } else {
                  if (usedspace < SHA512_BLOCK_LENGTH) {
                        bzero(&context->buffer[usedspace], SHA512_BLOCK_LENGTH - usedspace);
                  }
                  /* Do second-to-last transform: */
                  SHA512_Transform(context, (sha2_word64*)context->buffer);

                  /* And set-up for the last transform: */
                  bzero(context->buffer, SHA512_BLOCK_LENGTH - 2);
            }
      } else {
            /* Prepare for final transform: */
            bzero(context->buffer, SHA512_SHORT_BLOCK_LENGTH);

            /* Begin padding with a 1 bit: */
            *context->buffer = 0x80;
      }
      /* Store the length of input data (in bits): */
      *(sha2_word64*)&context->buffer[SHA512_SHORT_BLOCK_LENGTH] = context->bitcount[1];
      *(sha2_word64*)&context->buffer[SHA512_SHORT_BLOCK_LENGTH+8] = context->bitcount[0];

      /* Final transform: */
      SHA512_Transform(context, (sha2_word64*)context->buffer);
}

void SHA512_Final(sha2_byte digest[], SHA512_CTX* context) {
      sha2_word64 *d = (sha2_word64*)digest;

      /* Sanity check: */
      assert(context != (SHA512_CTX*)0);

      /* If no digest buffer is passed, we don't bother doing this: */
      if (digest != (sha2_byte*)0) {
            SHA512_Last(context);

            /* Save the hash data for output: */
#if BYTE_ORDER == LITTLE_ENDIAN
            {
                  /* Convert TO host byte order */
                  int   j;
                  for (j = 0; j < 8; j++) {
                        REVERSE64(context->state[j],context->state[j]);
                        *d++ = context->state[j];
                  }
            }
#else
            bcopy(context->state, d, SHA512_DIGEST_LENGTH);
#endif
      }

      /* Zero out state data */
      bzero(context, sizeof(*context));
}

char *SHA512_End(SHA512_CTX* context, char buffer[]) {
      sha2_byte   digest[SHA512_DIGEST_LENGTH], *d = digest;
      int         i;

      /* Sanity check: */
      assert(context != (SHA512_CTX*)0);

      if (buffer != (char*)0) {
            SHA512_Final(digest, context);

            for (i = 0; i < SHA512_DIGEST_LENGTH; i++) {
                  *buffer++ = sha2_hex_digits[(*d & 0xf0) >> 4];
                  *buffer++ = sha2_hex_digits[*d & 0x0f];
                  d++;
            }
            *buffer = (char)0;
      } else {
            bzero(context, sizeof(*context));
      }
      bzero(digest, SHA512_DIGEST_LENGTH);
      return buffer;
}

char* SHA512_Data(const sha2_byte* data, size_t len, char digest[SHA512_DIGEST_STRING_LENGTH]) {
      SHA512_CTX  context;

      SHA512_Init(&context);
      SHA512_Update(&context, data, len);
      return SHA512_End(&context, digest);
}


/*** SHA-384: *********************************************************/
void SHA384_Init(SHA384_CTX* context) {
      if (context == (SHA384_CTX*)0) {
            return;
      }
      bcopy(sha384_initial_hash_value, context->state, SHA512_DIGEST_LENGTH);
      bzero(context->buffer, SHA384_BLOCK_LENGTH);
      context->bitcount[0] = context->bitcount[1] = 0;
}

void SHA384_Update(SHA384_CTX* context, const sha2_byte* data, size_t len) {
      SHA512_Update((SHA512_CTX*)context, data, len);
}

void SHA384_Final(sha2_byte digest[], SHA384_CTX* context) {
      sha2_word64 *d = (sha2_word64*)digest;

      /* Sanity check: */
      assert(context != (SHA384_CTX*)0);

      /* If no digest buffer is passed, we don't bother doing this: */
      if (digest != (sha2_byte*)0) {
            SHA512_Last((SHA512_CTX*)context);

            /* Save the hash data for output: */
#if BYTE_ORDER == LITTLE_ENDIAN
            {
                  /* Convert TO host byte order */
                  int   j;
                  for (j = 0; j < 6; j++) {
                        REVERSE64(context->state[j],context->state[j]);
                        *d++ = context->state[j];
                  }
            }
#else
            bcopy(context->state, d, SHA384_DIGEST_LENGTH);
#endif
      }

      /* Zero out state data */
      bzero(context, sizeof(*context));
}

char *SHA384_End(SHA384_CTX* context, char buffer[]) {
      sha2_byte   digest[SHA384_DIGEST_LENGTH], *d = digest;
      int         i;

      /* Sanity check: */
      assert(context != (SHA384_CTX*)0);

      if (buffer != (char*)0) {
            SHA384_Final(digest, context);

            for (i = 0; i < SHA384_DIGEST_LENGTH; i++) {
                  *buffer++ = sha2_hex_digits[(*d & 0xf0) >> 4];
                  *buffer++ = sha2_hex_digits[*d & 0x0f];
                  d++;
            }
            *buffer = (char)0;
      } else {
            bzero(context, sizeof(*context));
      }
      bzero(digest, SHA384_DIGEST_LENGTH);
      return buffer;
}

char* SHA384_Data(const sha2_byte* data, size_t len, char digest[SHA384_DIGEST_STRING_LENGTH]) {
      SHA384_CTX  context;

      SHA384_Init(&context);
      SHA384_Update(&context, data, len);
      return SHA384_End(&context, digest);
}

/*glue*/
#ifdef HAVE_EVP_097

/* SHA256 */
#define data(ctx) ((SHA256_CTX *)(ctx)->md_data)
static int sha256_init(EVP_MD_CTX *ctx)
{
  SHA256_Init(data(ctx));
  return 1;
}
static int sha256_update(EVP_MD_CTX *ctx, const void *data, unsigned long count)
{
  SHA256_Update(data(ctx), data, count);
  return 1;
}
static int sha256_final(EVP_MD_CTX *ctx, unsigned char *md)
{
  SHA256_Final(md, data(ctx));
  return 1;
}
#undef data

/* SHA384 */
#define data(ctx) ((SHA384_CTX *)(ctx)->md_data)
static int sha384_init(EVP_MD_CTX *ctx)
{
  SHA384_Init(data(ctx));
  return 1;
}
static int sha384_update(EVP_MD_CTX *ctx, const void *data, unsigned long count)
{
  SHA384_Update(data(ctx), data, count);
  return 1;
}
static int sha384_final(EVP_MD_CTX *ctx, unsigned char *md)
{
  SHA384_Final(md, data(ctx));
  return 1;
}
#undef data

/* SHA512 */
#define data(ctx) ((SHA512_CTX *)(ctx)->md_data)
static int sha512_init(EVP_MD_CTX *ctx)
{
  SHA512_Init(data(ctx));
  return 1;
}
static int sha512_update(EVP_MD_CTX *ctx, const void *data, unsigned long count)
{
  SHA512_Update(data(ctx), data, count);
  return 1;
}
static int sha512_final(EVP_MD_CTX *ctx, unsigned char *md)
{
  SHA512_Final(md, data(ctx));
  return 1;
}
#undef data
#endif

static struct env_md_st sha2_256_md = {
      0, /*NID_sha1*/
      0, /*NID_sha1WithRSAEncryption*/
      SHA256_DIGEST_LENGTH,
#ifdef HAVE_EVP_097
      0,                /* flags */
      sha256_init,
      sha256_update,
      sha256_final,
      NULL,             /* copy */
      NULL,             /* cleanup */
#else
      SHA256_Init,
      SHA256_Update,
      SHA256_Final,
#endif
      NULL, NULL, {0, 0, 0, 0},
      SHA256_BLOCK_LENGTH,
      sizeof(struct env_md_st *) + sizeof(SHA256_CTX),
};

struct env_md_st *EVP_sha2_256(void)
{
      return(&sha2_256_md);
}

static struct env_md_st sha2_384_md = {
      0, /*NID_sha1*/
      0, /*NID_sha1WithRSAEncryption*/
      SHA384_DIGEST_LENGTH,
#ifdef HAVE_EVP_097
      0,                /* flags */
      sha384_init,
      sha384_update,
      sha384_final,
      NULL,             /* copy */
      NULL,             /* cleanup */
#else
      SHA384_Init,
      SHA384_Update,
      SHA384_Final,
#endif
      NULL, NULL, {0, 0, 0, 0},
      SHA384_BLOCK_LENGTH,
      sizeof(struct env_md_st *) + sizeof(SHA384_CTX),
};

struct env_md_st *EVP_sha2_384(void)
{
      return(&sha2_384_md);
}

static struct env_md_st sha2_512_md = {
      0, /*NID_sha1*/
      0, /*NID_sha1WithRSAEncryption*/
      SHA512_DIGEST_LENGTH,
#ifdef HAVE_EVP_097
      0,                /* flags */
      sha512_init,
      sha512_update,
      sha512_final,
      NULL,             /* copy */
      NULL,             /* cleanup */
#else
      SHA512_Init,
      SHA512_Update,
      SHA512_Final,
#endif
      NULL, NULL, {0, 0, 0, 0}, /*EVP_PKEY_RSA_method*/
      SHA512_BLOCK_LENGTH,
      sizeof(struct env_md_st *) + sizeof(SHA512_CTX),
};

struct env_md_st *EVP_sha2_512(void)
{
      return(&sha2_512_md);
}

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