FreeBSD/Linux Kernel Cross Reference
sys/crypto/sha2/sha2.c

     /*      $KAME: sha2.c,v 1.8 2001/11/08 01:07:52 itojun 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 <sys/cdefs.h>
    __FBSDID("$FreeBSD: src/sys/crypto/sha2/sha2.c,v 1.7 2003/09/08 18:32:33 phk Exp $");
    
    #include <sys/types.h>
    #include <sys/time.h>
    #ifdef _KERNEL
    #include <sys/systm.h>
    #else
    #include <string.h>
    #endif
    #include <machine/endian.h>
    #include <crypto/sha2/sha2.h>
    
    /*
     * 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
     *
     */
    
    #if defined(__bsdi__) || defined(__FreeBSD__)
    #define assert(x)
    #endif
    
    
    /*** 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: */
   static const 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: */
   static const 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: */
   static const 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 */
   static const sha2_word64 sha384_initial_hash_value[8] = {
           0xcbbb9d5dc1059ed8ULL,
           0x629a292a367cd507ULL,
           0x9159015a3070dd17ULL,
           0x152fecd8f70e5939ULL,
           0x67332667ffc00b31ULL,
           0x8eb44a8768581511ULL,
           0xdb0c2e0d64f98fa7ULL,
           0x47b5481dbefa4fa4ULL
   };
   
   /* Initial hash value H for SHA-512 */
   static const 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);
  }
  

Cache object: 07b04d4a0e71b4f0e6bc837e35f7c8e8