apt-pkg/contrib/sha2_internal.cc

   1 /*
   2  * FILE:        sha2.c
   3  * AUTHOR:      Aaron D. Gifford - http://www.aarongifford.com/
   4  *
   5  * Copyright (c) 2000-2001, Aaron D. Gifford
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the copyright holder nor the names of contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTOR(S) ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTOR(S) BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $Id: sha2.c,v 1.1 2001/11/08 00:01:51 adg Exp adg $
  33  */
  34 #include <config.h>
  35
  36 #include <string.h>     /* memcpy()/memset() or bcopy()/bzero() */
  37 #include <assert.h>     /* assert() */
  38 #include "sha2_internal.h"
  39
  40 /*
  41  * ASSERT NOTE:
  42  * Some sanity checking code is included using assert().  On my FreeBSD
  43  * system, this additional code can be removed by compiling with NDEBUG
  44  * defined.  Check your own systems manpage on assert() to see how to
  45  * compile WITHOUT the sanity checking code on your system.
  46  *
  47  * UNROLLED TRANSFORM LOOP NOTE:
  48  * You can define SHA2_UNROLL_TRANSFORM to use the unrolled transform
  49  * loop version for the hash transform rounds (defined using macros
  50  * later in this file).  Either define on the command line, for example:
  51  *
  52  *   cc -DSHA2_UNROLL_TRANSFORM -o sha2 sha2.c sha2prog.c
  53  *
  54  * or define below:
  55  *
  56  *   #define SHA2_UNROLL_TRANSFORM
  57  *
  58  */
  59
  60
  61 /*** SHA-256/384/512 Machine Architecture Definitions *****************/
  62 /*
  63  * BYTE_ORDER NOTE:
  64  *
  65  * Please make sure that your system defines BYTE_ORDER.  If your
  66  * architecture is little-endian, make sure it also defines
  67  * LITTLE_ENDIAN and that the two (BYTE_ORDER and LITTLE_ENDIAN) are
  68  * equivilent.
  69  *
  70  * If your system does not define the above, then you can do so by
  71  * hand like this:
  72  *
  73  *   #define LITTLE_ENDIAN 1234
  74  *   #define BIG_ENDIAN    4321
  75  *
  76  * And for little-endian machines, add:
  77  *
  78  *   #define BYTE_ORDER LITTLE_ENDIAN
  79  *
  80  * Or for big-endian machines:
  81  *
  82  *   #define BYTE_ORDER BIG_ENDIAN
  83  *
  84  * The FreeBSD machine this was written on defines BYTE_ORDER
  85  * appropriately by including <sys/types.h> (which in turn includes
  86  * <machine/endian.h> where the appropriate definitions are actually
  87  * made).
  88  */
  89 #if !defined(BYTE_ORDER) || (BYTE_ORDER != LITTLE_ENDIAN && BYTE_ORDER != BIG_ENDIAN)
  90 #error Define BYTE_ORDER to be equal to either LITTLE_ENDIAN or BIG_ENDIAN
  91 #endif
  92
  93 /*
  94  * Define the followingsha2_* types to types of the correct length on
  95  * the native archtecture.   Most BSD systems and Linux define u_intXX_t
  96  * types.  Machines with very recent ANSI C headers, can use the
  97  * uintXX_t definintions from inttypes.h by defining SHA2_USE_INTTYPES_H
  98  * during compile or in the sha.h header file.
  99  *
 100  * Machines that support neither u_intXX_t nor inttypes.h's uintXX_t
 101  * will need to define these three typedefs below (and the appropriate
 102  * ones in sha.h too) by hand according to their system architecture.
 103  *
 104  * Thank you, Jun-ichiro itojun Hagino, for suggesting using u_intXX_t
 105  * types and pointing out recent ANSI C support for uintXX_t in inttypes.h.
 106  */
 107 #ifdef SHA2_USE_INTTYPES_H
 108
 109 typedef uint8_t  sha2_byte;     /* Exactly 1 byte */
 110 typedef uint32_t sha2_word32;   /* Exactly 4 bytes */
 111 typedef uint64_t sha2_word64;   /* Exactly 8 bytes */
 112
 113 #else /* SHA2_USE_INTTYPES_H */
 114
 115 typedef u_int8_t  sha2_byte;    /* Exactly 1 byte */
 116 typedef u_int32_t sha2_word32;  /* Exactly 4 bytes */
 117 typedef u_int64_t sha2_word64;  /* Exactly 8 bytes */
 118
 119 #endif /* SHA2_USE_INTTYPES_H */
 120
 121
 122 /*** SHA-256/384/512 Various Length Definitions ***********************/
 123 /* NOTE: Most of these are in sha2.h */
 124 #define SHA256_SHORT_BLOCK_LENGTH       (SHA256_BLOCK_LENGTH - 8)
 125 #define SHA384_SHORT_BLOCK_LENGTH       (SHA384_BLOCK_LENGTH - 16)
 126 #define SHA512_SHORT_BLOCK_LENGTH       (SHA512_BLOCK_LENGTH - 16)
 127
 128
 129 /*** ENDIAN REVERSAL MACROS *******************************************/
 130 #if BYTE_ORDER == LITTLE_ENDIAN
 131 #define REVERSE32(w,x)  { \
 132         sha2_word32 tmp = (w); \
 133         tmp = (tmp >> 16) | (tmp << 16); \
 134         (x) = ((tmp & 0xff00ff00UL) >> 8) | ((tmp & 0x00ff00ffUL) << 8); \
 135 }
 136 #define REVERSE64(w,x)  { \
 137         sha2_word64 tmp = (w); \
 138         tmp = (tmp >> 32) | (tmp << 32); \
 139         tmp = ((tmp & 0xff00ff00ff00ff00ULL) >> 8) | \
 140               ((tmp & 0x00ff00ff00ff00ffULL) << 8); \
 141         (x) = ((tmp & 0xffff0000ffff0000ULL) >> 16) | \
 142               ((tmp & 0x0000ffff0000ffffULL) << 16); \
 143 }
 144 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
 145
 146 /*
 147  * Macro for incrementally adding the unsigned 64-bit integer n to the
 148  * unsigned 128-bit integer (represented using a two-element array of
 149  * 64-bit words):
 150  */
 151 #define ADDINC128(w,n)  { \
 152         (w)[0] += (sha2_word64)(n); \
 153         if ((w)[0] < (n)) { \
 154                 (w)[1]++; \
 155         } \
 156 }
 157
 158 /*
 159  * Macros for copying blocks of memory and for zeroing out ranges
 160  * of memory.  Using these macros makes it easy to switch from
 161  * using memset()/memcpy() and using bzero()/bcopy().
 162  *
 163  * Please define either SHA2_USE_MEMSET_MEMCPY or define
 164  * SHA2_USE_BZERO_BCOPY depending on which function set you
 165  * choose to use:
 166  */
 167 #if !defined(SHA2_USE_MEMSET_MEMCPY) && !defined(SHA2_USE_BZERO_BCOPY)
 168 /* Default to memset()/memcpy() if no option is specified */
 169 #define SHA2_USE_MEMSET_MEMCPY  1
 170 #endif
 171 #if defined(SHA2_USE_MEMSET_MEMCPY) && defined(SHA2_USE_BZERO_BCOPY)
 172 /* Abort with an error if BOTH options are defined */
 173 #error Define either SHA2_USE_MEMSET_MEMCPY or SHA2_USE_BZERO_BCOPY, not both!
 174 #endif
 175
 176 #ifdef SHA2_USE_MEMSET_MEMCPY
 177 #define MEMSET_BZERO(p,l)       memset((p), 0, (l))
 178 #define MEMCPY_BCOPY(d,s,l)     memcpy((d), (s), (l))
 179 #endif
 180 #ifdef SHA2_USE_BZERO_BCOPY
 181 #define MEMSET_BZERO(p,l)       bzero((p), (l))
 182 #define MEMCPY_BCOPY(d,s,l)     bcopy((s), (d), (l))
 183 #endif
 184
 185
 186 /*** THE SIX LOGICAL FUNCTIONS ****************************************/
 187 /*
 188  * Bit shifting and rotation (used by the six SHA-XYZ logical functions:
 189  *
 190  *   NOTE:  The naming of R and S appears backwards here (R is a SHIFT and
 191  *   S is a ROTATION) because the SHA-256/384/512 description document
 192  *   (see http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf) uses this
 193  *   same "backwards" definition.
 194  */
 195 /* Shift-right (used in SHA-256, SHA-384, and SHA-512): */
 196 #define R(b,x)          ((x) >> (b))
 197 /* 32-bit Rotate-right (used in SHA-256): */
 198 #define S32(b,x)        (((x) >> (b)) | ((x) << (32 - (b))))
 199 /* 64-bit Rotate-right (used in SHA-384 and SHA-512): */
 200 #define S64(b,x)        (((x) >> (b)) | ((x) << (64 - (b))))
 201
 202 /* Two of six logical functions used in SHA-256, SHA-384, and SHA-512: */
 203 #define Ch(x,y,z)       (((x) & (y)) ^ ((~(x)) & (z)))
 204 #define Maj(x,y,z)      (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
 205
 206 /* Four of six logical functions used in SHA-256: */
 207 #define Sigma0_256(x)   (S32(2,  (x)) ^ S32(13, (x)) ^ S32(22, (x)))
 208 #define Sigma1_256(x)   (S32(6,  (x)) ^ S32(11, (x)) ^ S32(25, (x)))
 209 #define sigma0_256(x)   (S32(7,  (x)) ^ S32(18, (x)) ^ R(3 ,   (x)))
 210 #define sigma1_256(x)   (S32(17, (x)) ^ S32(19, (x)) ^ R(10,   (x)))
 211
 212 /* Four of six logical functions used in SHA-384 and SHA-512: */
 213 #define Sigma0_512(x)   (S64(28, (x)) ^ S64(34, (x)) ^ S64(39, (x)))
 214 #define Sigma1_512(x)   (S64(14, (x)) ^ S64(18, (x)) ^ S64(41, (x)))
 215 #define sigma0_512(x)   (S64( 1, (x)) ^ S64( 8, (x)) ^ R( 7,   (x)))
 216 #define sigma1_512(x)   (S64(19, (x)) ^ S64(61, (x)) ^ R( 6,   (x)))
 217
 218 /*** INTERNAL FUNCTION PROTOTYPES *************************************/
 219 /* NOTE: These should not be accessed directly from outside this
 220  * library -- they are intended for private internal visibility/use
 221  * only.
 222  */
 223 static void SHA512_Last(SHA512_CTX*);
 224 static void SHA256_Transform(SHA256_CTX*, const sha2_word32*);
 225 static void SHA512_Transform(SHA512_CTX*, const sha2_word64*);
 226
 227
 228 /*** SHA-XYZ INITIAL HASH VALUES AND CONSTANTS ************************/
 229 /* Hash constant words K for SHA-256: */
 230 const static sha2_word32 K256[64] = {
 231         0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL,
 232         0x3956c25bUL, 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL,
 233         0xd807aa98UL, 0x12835b01UL, 0x243185beUL, 0x550c7dc3UL,
 234         0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL, 0xc19bf174UL,
 235         0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
 236         0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL,
 237         0x983e5152UL, 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL,
 238         0xc6e00bf3UL, 0xd5a79147UL, 0x06ca6351UL, 0x14292967UL,
 239         0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL, 0x53380d13UL,
 240         0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
 241         0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL,
 242         0xd192e819UL, 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL,
 243         0x19a4c116UL, 0x1e376c08UL, 0x2748774cUL, 0x34b0bcb5UL,
 244         0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL, 0x682e6ff3UL,
 245         0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
 246         0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL
 247 };
 248
 249 /* Initial hash value H for SHA-256: */
 250 const static sha2_word32 sha256_initial_hash_value[8] = {
 251         0x6a09e667UL,
 252         0xbb67ae85UL,
 253         0x3c6ef372UL,
 254         0xa54ff53aUL,
 255         0x510e527fUL,
 256         0x9b05688cUL,
 257         0x1f83d9abUL,
 258         0x5be0cd19UL
 259 };
 260
 261 /* Hash constant words K for SHA-384 and SHA-512: */
 262 const static sha2_word64 K512[80] = {
 263         0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL,
 264         0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL,
 265         0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
 266         0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL,
 267         0xd807aa98a3030242ULL, 0x12835b0145706fbeULL,
 268         0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
 269         0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL,
 270         0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL,
 271         0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
 272         0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL,
 273         0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL,
 274         0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
 275         0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL,
 276         0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL,
 277         0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
 278         0x06ca6351e003826fULL, 0x142929670a0e6e70ULL,
 279         0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL,
 280         0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
 281         0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL,
 282         0x81c2c92e47edaee6ULL, 0x92722c851482353bULL,
 283         0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
 284         0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL,
 285         0xd192e819d6ef5218ULL, 0xd69906245565a910ULL,
 286         0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
 287         0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL,
 288         0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL,
 289         0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
 290         0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL,
 291         0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL,
 292         0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
 293         0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL,
 294         0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL,
 295         0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
 296         0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL,
 297         0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL,
 298         0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
 299         0x28db77f523047d84ULL, 0x32caab7b40c72493ULL,
 300         0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL,
 301         0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
 302         0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL
 303 };
 304
 305 /* Initial hash value H for SHA-384 */
 306 const static sha2_word64 sha384_initial_hash_value[8] = {
 307         0xcbbb9d5dc1059ed8ULL,
 308         0x629a292a367cd507ULL,
 309         0x9159015a3070dd17ULL,
 310         0x152fecd8f70e5939ULL,
 311         0x67332667ffc00b31ULL,
 312         0x8eb44a8768581511ULL,
 313         0xdb0c2e0d64f98fa7ULL,
 314         0x47b5481dbefa4fa4ULL
 315 };
 316
 317 /* Initial hash value H for SHA-512 */
 318 const static sha2_word64 sha512_initial_hash_value[8] = {
 319         0x6a09e667f3bcc908ULL,
 320         0xbb67ae8584caa73bULL,
 321         0x3c6ef372fe94f82bULL,
 322         0xa54ff53a5f1d36f1ULL,
 323         0x510e527fade682d1ULL,
 324         0x9b05688c2b3e6c1fULL,
 325         0x1f83d9abfb41bd6bULL,
 326         0x5be0cd19137e2179ULL
 327 };
 328
 329 /*
 330  * Constant used by SHA256/384/512_End() functions for converting the
 331  * digest to a readable hexadecimal character string:
 332  */
 333 static const char *sha2_hex_digits = "0123456789abcdef";
 334
 335
 336 /*** SHA-256: *********************************************************/
 337 void SHA256_Init(SHA256_CTX* context) {
 338         if (context == (SHA256_CTX*)0) {
 339                 return;
 340         }
 341         MEMCPY_BCOPY(context->state, sha256_initial_hash_value, SHA256_DIGEST_LENGTH);
 342         MEMSET_BZERO(context->buffer, SHA256_BLOCK_LENGTH);
 343         context->bitcount = 0;
 344 }
 345
 346 #ifdef SHA2_UNROLL_TRANSFORM
 347
 348 /* Unrolled SHA-256 round macros: */
 349
 350 #if BYTE_ORDER == LITTLE_ENDIAN
 351
 352 #define ROUND256_0_TO_15(a,b,c,d,e,f,g,h)       \
 353         REVERSE32(*data++, W256[j]); \
 354         T1 = (h) + Sigma1_256(e) + Ch((e), (f), (g)) + \
 355              K256[j] + W256[j]; \
 356         (d) += T1; \
 357         (h) = T1 + Sigma0_256(a) + Maj((a), (b), (c)); \
 358         j++
 359
 360
 361 #else /* BYTE_ORDER == LITTLE_ENDIAN */
 362
 363 #define ROUND256_0_TO_15(a,b,c,d,e,f,g,h)       \
 364         T1 = (h) + Sigma1_256(e) + Ch((e), (f), (g)) + \
 365              K256[j] + (W256[j] = *data++); \
 366         (d) += T1; \
 367         (h) = T1 + Sigma0_256(a) + Maj((a), (b), (c)); \
 368         j++
 369
 370 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
 371
 372 #define ROUND256(a,b,c,d,e,f,g,h)       \
 373         s0 = W256[(j+1)&0x0f]; \
 374         s0 = sigma0_256(s0); \
 375         s1 = W256[(j+14)&0x0f]; \
 376         s1 = sigma1_256(s1); \
 377         T1 = (h) + Sigma1_256(e) + Ch((e), (f), (g)) + K256[j] + \
 378              (W256[j&0x0f] += s1 + W256[(j+9)&0x0f] + s0); \
 379         (d) += T1; \
 380         (h) = T1 + Sigma0_256(a) + Maj((a), (b), (c)); \
 381         j++
 382
 383 static void SHA256_Transform(SHA256_CTX* context, const sha2_word32* data) {
 384         sha2_word32     a, b, c, d, e, f, g, h, s0, s1;
 385         sha2_word32     T1, *W256;
 386         int             j;
 387
 388         W256 = (sha2_word32*)context->buffer;
 389
 390         /* Initialize registers with the prev. intermediate value */
 391         a = context->state[0];
 392         b = context->state[1];
 393         c = context->state[2];
 394         d = context->state[3];
 395         e = context->state[4];
 396         f = context->state[5];
 397         g = context->state[6];
 398         h = context->state[7];
 399
 400         j = 0;
 401         do {
 402                 /* Rounds 0 to 15 (unrolled): */
 403                 ROUND256_0_TO_15(a,b,c,d,e,f,g,h);
 404                 ROUND256_0_TO_15(h,a,b,c,d,e,f,g);
 405                 ROUND256_0_TO_15(g,h,a,b,c,d,e,f);
 406                 ROUND256_0_TO_15(f,g,h,a,b,c,d,e);
 407                 ROUND256_0_TO_15(e,f,g,h,a,b,c,d);
 408                 ROUND256_0_TO_15(d,e,f,g,h,a,b,c);
 409                 ROUND256_0_TO_15(c,d,e,f,g,h,a,b);
 410                 ROUND256_0_TO_15(b,c,d,e,f,g,h,a);
 411         } while (j < 16);
 412
 413         /* Now for the remaining rounds to 64: */
 414         do {
 415                 ROUND256(a,b,c,d,e,f,g,h);
 416                 ROUND256(h,a,b,c,d,e,f,g);
 417                 ROUND256(g,h,a,b,c,d,e,f);
 418                 ROUND256(f,g,h,a,b,c,d,e);
 419                 ROUND256(e,f,g,h,a,b,c,d);
 420                 ROUND256(d,e,f,g,h,a,b,c);
 421                 ROUND256(c,d,e,f,g,h,a,b);
 422                 ROUND256(b,c,d,e,f,g,h,a);
 423         } while (j < 64);
 424
 425         /* Compute the current intermediate hash value */
 426         context->state[0] += a;
 427         context->state[1] += b;
 428         context->state[2] += c;
 429         context->state[3] += d;
 430         context->state[4] += e;
 431         context->state[5] += f;
 432         context->state[6] += g;
 433         context->state[7] += h;
 434
 435         /* Clean up */
 436         a = b = c = d = e = f = g = h = T1 = 0;
 437 }
 438
 439 #else /* SHA2_UNROLL_TRANSFORM */
 440
 441 static void SHA256_Transform(SHA256_CTX* context, const sha2_word32* data) {
 442         sha2_word32     a, b, c, d, e, f, g, h, s0, s1;
 443         sha2_word32     T1, T2, *W256;
 444         int             j;
 445
 446         W256 = (sha2_word32*)context->buffer;
 447
 448         /* Initialize registers with the prev. intermediate value */
 449         a = context->state[0];
 450         b = context->state[1];
 451         c = context->state[2];
 452         d = context->state[3];
 453         e = context->state[4];
 454         f = context->state[5];
 455         g = context->state[6];
 456         h = context->state[7];
 457
 458         j = 0;
 459         do {
 460 #if BYTE_ORDER == LITTLE_ENDIAN
 461                 /* Copy data while converting to host byte order */
 462                 REVERSE32(*data++,W256[j]);
 463                 /* Apply the SHA-256 compression function to update a..h */
 464                 T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] + W256[j];
 465 #else /* BYTE_ORDER == LITTLE_ENDIAN */
 466                 /* Apply the SHA-256 compression function to update a..h with copy */
 467                 T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] + (W256[j] = *data++);
 468 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
 469                 T2 = Sigma0_256(a) + Maj(a, b, c);
 470                 h = g;
 471                 g = f;
 472                 f = e;
 473                 e = d + T1;
 474                 d = c;
 475                 c = b;
 476                 b = a;
 477                 a = T1 + T2;
 478
 479                 j++;
 480         } while (j < 16);
 481
 482         do {
 483                 /* Part of the message block expansion: */
 484                 s0 = W256[(j+1)&0x0f];
 485                 s0 = sigma0_256(s0);
 486                 s1 = W256[(j+14)&0x0f];
 487                 s1 = sigma1_256(s1);
 488
 489                 /* Apply the SHA-256 compression function to update a..h */
 490                 T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] +
 491                      (W256[j&0x0f] += s1 + W256[(j+9)&0x0f] + s0);
 492                 T2 = Sigma0_256(a) + Maj(a, b, c);
 493                 h = g;
 494                 g = f;
 495                 f = e;
 496                 e = d + T1;
 497                 d = c;
 498                 c = b;
 499                 b = a;
 500                 a = T1 + T2;
 501
 502                 j++;
 503         } while (j < 64);
 504
 505         /* Compute the current intermediate hash value */
 506         context->state[0] += a;
 507         context->state[1] += b;
 508         context->state[2] += c;
 509         context->state[3] += d;
 510         context->state[4] += e;
 511         context->state[5] += f;
 512         context->state[6] += g;
 513         context->state[7] += h;
 514
 515         /* Clean up */
 516         a = b = c = d = e = f = g = h = T1 = T2 = 0;
 517 }
 518
 519 #endif /* SHA2_UNROLL_TRANSFORM */
 520
 521 void SHA256_Update(SHA256_CTX* context, const sha2_byte *data, size_t len) {
 522         unsigned int    freespace, usedspace;
 523
 524         if (len == 0) {
 525                 /* Calling with no data is valid - we do nothing */
 526                 return;
 527         }
 528
 529         /* Sanity check: */
 530         assert(context != (SHA256_CTX*)0 && data != (sha2_byte*)0);
 531
 532         usedspace = (context->bitcount >> 3) % SHA256_BLOCK_LENGTH;
 533         if (usedspace > 0) {
 534                 /* Calculate how much free space is available in the buffer */
 535                 freespace = SHA256_BLOCK_LENGTH - usedspace;
 536
 537                 if (len >= freespace) {
 538                         /* Fill the buffer completely and process it */
 539                         MEMCPY_BCOPY(&context->buffer[usedspace], data, freespace);
 540                         context->bitcount += freespace << 3;
 541                         len -= freespace;
 542                         data += freespace;
 543                         SHA256_Transform(context, (sha2_word32*)context->buffer);
 544                 } else {
 545                         /* The buffer is not yet full */
 546                         MEMCPY_BCOPY(&context->buffer[usedspace], data, len);
 547                         context->bitcount += len << 3;
 548                         /* Clean up: */
 549                         usedspace = freespace = 0;
 550                         return;
 551                 }
 552         }
 553         while (len >= SHA256_BLOCK_LENGTH) {
 554                 /* Process as many complete blocks as we can */
 555                 sha2_byte buffer[SHA256_BLOCK_LENGTH];
 556                 MEMCPY_BCOPY(buffer, data, SHA256_BLOCK_LENGTH);
 557                 SHA256_Transform(context, (sha2_word32*)buffer);
 558                 context->bitcount += SHA256_BLOCK_LENGTH << 3;
 559                 len -= SHA256_BLOCK_LENGTH;
 560                 data += SHA256_BLOCK_LENGTH;
 561         }
 562         if (len > 0) {
 563                 /* There's left-overs, so save 'em */
 564                 MEMCPY_BCOPY(context->buffer, data, len);
 565                 context->bitcount += len << 3;
 566         }
 567         /* Clean up: */
 568         usedspace = freespace = 0;
 569 }
 570
 571 void SHA256_Final(sha2_byte digest[], SHA256_CTX* context) {
 572         sha2_word32     *d = (sha2_word32*)digest;
 573         unsigned int    usedspace;
 574
 575         /* Sanity check: */
 576         assert(context != (SHA256_CTX*)0);
 577
 578         /* If no digest buffer is passed, we don't bother doing this: */
 579         if (digest != (sha2_byte*)0) {
 580                 usedspace = (context->bitcount >> 3) % SHA256_BLOCK_LENGTH;
 581 #if BYTE_ORDER == LITTLE_ENDIAN
 582                 /* Convert FROM host byte order */
 583                 REVERSE64(context->bitcount,context->bitcount);
 584 #endif
 585                 if (usedspace > 0) {
 586                         /* Begin padding with a 1 bit: */
 587                         context->buffer[usedspace++] = 0x80;
 588
 589                         if (usedspace <= SHA256_SHORT_BLOCK_LENGTH) {
 590                                 /* Set-up for the last transform: */
 591                                 MEMSET_BZERO(&context->buffer[usedspace], SHA256_SHORT_BLOCK_LENGTH - usedspace);
 592                         } else {
 593                                 if (usedspace < SHA256_BLOCK_LENGTH) {
 594                                         MEMSET_BZERO(&context->buffer[usedspace], SHA256_BLOCK_LENGTH - usedspace);
 595                                 }
 596                                 /* Do second-to-last transform: */
 597                                 SHA256_Transform(context, (sha2_word32*)context->buffer);
 598
 599                                 /* And set-up for the last transform: */
 600                                 MEMSET_BZERO(context->buffer, SHA256_SHORT_BLOCK_LENGTH);
 601                         }
 602                 } else {
 603                         /* Set-up for the last transform: */
 604                         MEMSET_BZERO(context->buffer, SHA256_SHORT_BLOCK_LENGTH);
 605
 606                         /* Begin padding with a 1 bit: */
 607                         *context->buffer = 0x80;
 608                 }
 609                 /* Set the bit count: */
 610                 union {
 611                         sha2_byte* c;
 612                         sha2_word64* l;
 613                 } bitcount;
 614                 bitcount.c = &context->buffer[SHA256_SHORT_BLOCK_LENGTH];
 615                 *(bitcount.l) = context->bitcount;
 616
 617                 /* Final transform: */
 618                 SHA256_Transform(context, (sha2_word32*)context->buffer);
 619
 620 #if BYTE_ORDER == LITTLE_ENDIAN
 621                 {
 622                         /* Convert TO host byte order */
 623                         int     j;
 624                         for (j = 0; j < 8; j++) {
 625                                 REVERSE32(context->state[j],context->state[j]);
 626                                 *d++ = context->state[j];
 627                         }
 628                 }
 629 #else
 630                 MEMCPY_BCOPY(d, context->state, SHA256_DIGEST_LENGTH);
 631 #endif
 632         }
 633
 634         /* Clean up state data: */
 635         MEMSET_BZERO(context, sizeof(*context));
 636         usedspace = 0;
 637 }
 638
 639 char *SHA256_End(SHA256_CTX* context, char buffer[]) {
 640         sha2_byte       digest[SHA256_DIGEST_LENGTH], *d = digest;
 641         int             i;
 642
 643         /* Sanity check: */
 644         assert(context != (SHA256_CTX*)0);
 645
 646         if (buffer != (char*)0) {
 647                 SHA256_Final(digest, context);
 648
 649                 for (i = 0; i < SHA256_DIGEST_LENGTH; i++) {
 650                         *buffer++ = sha2_hex_digits[(*d & 0xf0) >> 4];
 651                         *buffer++ = sha2_hex_digits[*d & 0x0f];
 652                         d++;
 653                 }
 654                 *buffer = (char)0;
 655         } else {
 656                 MEMSET_BZERO(context, sizeof(*context));
 657         }
 658         MEMSET_BZERO(digest, SHA256_DIGEST_LENGTH);
 659         return buffer;
 660 }
 661
 662 char* SHA256_Data(const sha2_byte* data, size_t len, char digest[SHA256_DIGEST_STRING_LENGTH]) {
 663         SHA256_CTX      context;
 664
 665         SHA256_Init(&context);
 666         SHA256_Update(&context, data, len);
 667         return SHA256_End(&context, digest);
 668 }
 669
 670
 671 /*** SHA-512: *********************************************************/
 672 void SHA512_Init(SHA512_CTX* context) {
 673         if (context == (SHA512_CTX*)0) {
 674                 return;
 675         }
 676         MEMCPY_BCOPY(context->state, sha512_initial_hash_value, SHA512_DIGEST_LENGTH);
 677         MEMSET_BZERO(context->buffer, SHA512_BLOCK_LENGTH);
 678         context->bitcount[0] = context->bitcount[1] =  0;
 679 }
 680
 681 #ifdef SHA2_UNROLL_TRANSFORM
 682
 683 /* Unrolled SHA-512 round macros: */
 684 #if BYTE_ORDER == LITTLE_ENDIAN
 685
 686 #define ROUND512_0_TO_15(a,b,c,d,e,f,g,h)       \
 687         REVERSE64(*data++, W512[j]); \
 688         T1 = (h) + Sigma1_512(e) + Ch((e), (f), (g)) + \
 689              K512[j] + W512[j]; \
 690         (d) += T1, \
 691         (h) = T1 + Sigma0_512(a) + Maj((a), (b), (c)), \
 692         j++
 693
 694
 695 #else /* BYTE_ORDER == LITTLE_ENDIAN */
 696
 697 #define ROUND512_0_TO_15(a,b,c,d,e,f,g,h)       \
 698         T1 = (h) + Sigma1_512(e) + Ch((e), (f), (g)) + \
 699              K512[j] + (W512[j] = *data++); \
 700         (d) += T1; \
 701         (h) = T1 + Sigma0_512(a) + Maj((a), (b), (c)); \
 702         j++
 703
 704 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
 705
 706 #define ROUND512(a,b,c,d,e,f,g,h)       \
 707         s0 = W512[(j+1)&0x0f]; \
 708         s0 = sigma0_512(s0); \
 709         s1 = W512[(j+14)&0x0f]; \
 710         s1 = sigma1_512(s1); \
 711         T1 = (h) + Sigma1_512(e) + Ch((e), (f), (g)) + K512[j] + \
 712              (W512[j&0x0f] += s1 + W512[(j+9)&0x0f] + s0); \
 713         (d) += T1; \
 714         (h) = T1 + Sigma0_512(a) + Maj((a), (b), (c)); \
 715         j++
 716
 717 static void SHA512_Transform(SHA512_CTX* context, const sha2_word64* data) {
 718         sha2_word64     a, b, c, d, e, f, g, h, s0, s1;
 719         sha2_word64     T1, *W512 = (sha2_word64*)context->buffer;
 720         int             j;
 721
 722         /* Initialize registers with the prev. intermediate value */
 723         a = context->state[0];
 724         b = context->state[1];
 725         c = context->state[2];
 726         d = context->state[3];
 727         e = context->state[4];
 728         f = context->state[5];
 729         g = context->state[6];
 730         h = context->state[7];
 731
 732         j = 0;
 733         do {
 734                 ROUND512_0_TO_15(a,b,c,d,e,f,g,h);
 735                 ROUND512_0_TO_15(h,a,b,c,d,e,f,g);
 736                 ROUND512_0_TO_15(g,h,a,b,c,d,e,f);
 737                 ROUND512_0_TO_15(f,g,h,a,b,c,d,e);
 738                 ROUND512_0_TO_15(e,f,g,h,a,b,c,d);
 739                 ROUND512_0_TO_15(d,e,f,g,h,a,b,c);
 740                 ROUND512_0_TO_15(c,d,e,f,g,h,a,b);
 741                 ROUND512_0_TO_15(b,c,d,e,f,g,h,a);
 742         } while (j < 16);
 743
 744         /* Now for the remaining rounds up to 79: */
 745         do {
 746                 ROUND512(a,b,c,d,e,f,g,h);
 747                 ROUND512(h,a,b,c,d,e,f,g);
 748                 ROUND512(g,h,a,b,c,d,e,f);
 749                 ROUND512(f,g,h,a,b,c,d,e);
 750                 ROUND512(e,f,g,h,a,b,c,d);
 751                 ROUND512(d,e,f,g,h,a,b,c);
 752                 ROUND512(c,d,e,f,g,h,a,b);
 753                 ROUND512(b,c,d,e,f,g,h,a);
 754         } while (j < 80);
 755
 756         /* Compute the current intermediate hash value */
 757         context->state[0] += a;
 758         context->state[1] += b;
 759         context->state[2] += c;
 760         context->state[3] += d;
 761         context->state[4] += e;
 762         context->state[5] += f;
 763         context->state[6] += g;
 764         context->state[7] += h;
 765
 766         /* Clean up */
 767         a = b = c = d = e = f = g = h = T1 = 0;
 768 }
 769
 770 #else /* SHA2_UNROLL_TRANSFORM */
 771
 772 static void SHA512_Transform(SHA512_CTX* context, const sha2_word64* data) {
 773         sha2_word64     a, b, c, d, e, f, g, h, s0, s1;
 774         sha2_word64     T1, T2, *W512 = (sha2_word64*)context->buffer;
 775         int             j;
 776
 777         /* Initialize registers with the prev. intermediate value */
 778         a = context->state[0];
 779         b = context->state[1];
 780         c = context->state[2];
 781         d = context->state[3];
 782         e = context->state[4];
 783         f = context->state[5];
 784         g = context->state[6];
 785         h = context->state[7];
 786
 787         j = 0;
 788         do {
 789 #if BYTE_ORDER == LITTLE_ENDIAN
 790                 /* Convert TO host byte order */
 791                 REVERSE64(*data++, W512[j]);
 792                 /* Apply the SHA-512 compression function to update a..h */
 793                 T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] + W512[j];
 794 #else /* BYTE_ORDER == LITTLE_ENDIAN */
 795                 /* Apply the SHA-512 compression function to update a..h with copy */
 796                 T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] + (W512[j] = *data++);
 797 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
 798                 T2 = Sigma0_512(a) + Maj(a, b, c);
 799                 h = g;
 800                 g = f;
 801                 f = e;
 802                 e = d + T1;
 803                 d = c;
 804                 c = b;
 805                 b = a;
 806                 a = T1 + T2;
 807
 808                 j++;
 809         } while (j < 16);
 810
 811         do {
 812                 /* Part of the message block expansion: */
 813                 s0 = W512[(j+1)&0x0f];
 814                 s0 = sigma0_512(s0);
 815                 s1 = W512[(j+14)&0x0f];
 816                 s1 =  sigma1_512(s1);
 817
 818                 /* Apply the SHA-512 compression function to update a..h */
 819                 T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] +
 820                      (W512[j&0x0f] += s1 + W512[(j+9)&0x0f] + s0);
 821                 T2 = Sigma0_512(a) + Maj(a, b, c);
 822                 h = g;
 823                 g = f;
 824                 f = e;
 825                 e = d + T1;
 826                 d = c;
 827                 c = b;
 828                 b = a;
 829                 a = T1 + T2;
 830
 831                 j++;
 832         } while (j < 80);
 833
 834         /* Compute the current intermediate hash value */
 835         context->state[0] += a;
 836         context->state[1] += b;
 837         context->state[2] += c;
 838         context->state[3] += d;
 839         context->state[4] += e;
 840         context->state[5] += f;
 841         context->state[6] += g;
 842         context->state[7] += h;
 843
 844         /* Clean up */
 845         a = b = c = d = e = f = g = h = T1 = T2 = 0;
 846 }
 847
 848 #endif /* SHA2_UNROLL_TRANSFORM */
 849
 850 void SHA512_Update(SHA512_CTX* context, const sha2_byte *data, size_t len) {
 851         unsigned int    freespace, usedspace;
 852
 853         if (len == 0) {
 854                 /* Calling with no data is valid - we do nothing */
 855                 return;
 856         }
 857
 858         /* Sanity check: */
 859         assert(context != (SHA512_CTX*)0 && data != (sha2_byte*)0);
 860
 861         usedspace = (context->bitcount[0] >> 3) % SHA512_BLOCK_LENGTH;
 862         if (usedspace > 0) {
 863                 /* Calculate how much free space is available in the buffer */
 864                 freespace = SHA512_BLOCK_LENGTH - usedspace;
 865
 866                 if (len >= freespace) {
 867                         /* Fill the buffer completely and process it */
 868                         MEMCPY_BCOPY(&context->buffer[usedspace], data, freespace);
 869                         ADDINC128(context->bitcount, freespace << 3);
 870                         len -= freespace;
 871                         data += freespace;
 872                         SHA512_Transform(context, (sha2_word64*)context->buffer);
 873                 } else {
 874                         /* The buffer is not yet full */
 875                         MEMCPY_BCOPY(&context->buffer[usedspace], data, len);
 876                         ADDINC128(context->bitcount, len << 3);
 877                         /* Clean up: */
 878                         usedspace = freespace = 0;
 879                         return;
 880                 }
 881         }
 882         while (len >= SHA512_BLOCK_LENGTH) {
 883                 /* Process as many complete blocks as we can */
 884                 sha2_byte buffer[SHA512_BLOCK_LENGTH];
 885                 MEMCPY_BCOPY(buffer, data, SHA512_BLOCK_LENGTH);
 886                 SHA512_Transform(context, (sha2_word64*)buffer);
 887                 ADDINC128(context->bitcount, SHA512_BLOCK_LENGTH << 3);
 888                 len -= SHA512_BLOCK_LENGTH;
 889                 data += SHA512_BLOCK_LENGTH;
 890         }
 891         if (len > 0) {
 892                 /* There's left-overs, so save 'em */
 893                 MEMCPY_BCOPY(context->buffer, data, len);
 894                 ADDINC128(context->bitcount, len << 3);
 895         }
 896         /* Clean up: */
 897         usedspace = freespace = 0;
 898 }
 899
 900 static void SHA512_Last(SHA512_CTX* context) {
 901         unsigned int    usedspace;
 902
 903         usedspace = (context->bitcount[0] >> 3) % SHA512_BLOCK_LENGTH;
 904 #if BYTE_ORDER == LITTLE_ENDIAN
 905         /* Convert FROM host byte order */
 906         REVERSE64(context->bitcount[0],context->bitcount[0]);
 907         REVERSE64(context->bitcount[1],context->bitcount[1]);
 908 #endif
 909         if (usedspace > 0) {
 910                 /* Begin padding with a 1 bit: */
 911                 context->buffer[usedspace++] = 0x80;
 912
 913                 if (usedspace <= SHA512_SHORT_BLOCK_LENGTH) {
 914                         /* Set-up for the last transform: */
 915                         MEMSET_BZERO(&context->buffer[usedspace], SHA512_SHORT_BLOCK_LENGTH - usedspace);
 916                 } else {
 917                         if (usedspace < SHA512_BLOCK_LENGTH) {
 918                                 MEMSET_BZERO(&context->buffer[usedspace], SHA512_BLOCK_LENGTH - usedspace);
 919                         }
 920                         /* Do second-to-last transform: */
 921                         SHA512_Transform(context, (sha2_word64*)context->buffer);
 922
 923                         /* And set-up for the last transform: */
 924                         MEMSET_BZERO(context->buffer, SHA512_BLOCK_LENGTH - 2);
 925                 }
 926         } else {
 927                 /* Prepare for final transform: */
 928                 MEMSET_BZERO(context->buffer, SHA512_SHORT_BLOCK_LENGTH);
 929
 930                 /* Begin padding with a 1 bit: */
 931                 *context->buffer = 0x80;
 932         }
 933         /* Store the length of input data (in bits): */
 934         union {
 935                 sha2_byte* c;
 936                 sha2_word64* l;
 937         } bitcount;
 938         bitcount.c = &context->buffer[SHA512_SHORT_BLOCK_LENGTH];
 939         bitcount.l[0] = context->bitcount[1];
 940         bitcount.l[1] = context->bitcount[0];
 941
 942         /* Final transform: */
 943         SHA512_Transform(context, (sha2_word64*)context->buffer);
 944 }
 945
 946 void SHA512_Final(sha2_byte digest[], SHA512_CTX* context) {
 947         sha2_word64     *d = (sha2_word64*)digest;
 948
 949         /* Sanity check: */
 950         assert(context != (SHA512_CTX*)0);
 951
 952         /* If no digest buffer is passed, we don't bother doing this: */
 953         if (digest != (sha2_byte*)0) {
 954                 SHA512_Last(context);
 955
 956                 /* Save the hash data for output: */
 957 #if BYTE_ORDER == LITTLE_ENDIAN
 958                 {
 959                         /* Convert TO host byte order */
 960                         int     j;
 961                         for (j = 0; j < 8; j++) {
 962                                 REVERSE64(context->state[j],context->state[j]);
 963                                 *d++ = context->state[j];
 964                         }
 965                 }
 966 #else
 967                 MEMCPY_BCOPY(d, context->state, SHA512_DIGEST_LENGTH);
 968 #endif
 969         }
 970
 971         /* Zero out state data */
 972         MEMSET_BZERO(context, sizeof(*context));
 973 }
 974
 975 char *SHA512_End(SHA512_CTX* context, char buffer[]) {
 976         sha2_byte       digest[SHA512_DIGEST_LENGTH], *d = digest;
 977         int             i;
 978
 979         /* Sanity check: */
 980         assert(context != (SHA512_CTX*)0);
 981
 982         if (buffer != (char*)0) {
 983                 SHA512_Final(digest, context);
 984
 985                 for (i = 0; i < SHA512_DIGEST_LENGTH; i++) {
 986                         *buffer++ = sha2_hex_digits[(*d & 0xf0) >> 4];
 987                         *buffer++ = sha2_hex_digits[*d & 0x0f];
 988                         d++;
 989                 }
 990                 *buffer = (char)0;
 991         } else {
 992                 MEMSET_BZERO(context, sizeof(*context));
 993         }
 994         MEMSET_BZERO(digest, SHA512_DIGEST_LENGTH);
 995         return buffer;
 996 }
 997
 998 char* SHA512_Data(const sha2_byte* data, size_t len, char digest[SHA512_DIGEST_STRING_LENGTH]) {
 999         SHA512_CTX      context;
1000
1001         SHA512_Init(&context);
1002         SHA512_Update(&context, data, len);
1003         return SHA512_End(&context, digest);
1004 }
1005
1006
1007 /*** SHA-384: *********************************************************/
1008 void SHA384_Init(SHA384_CTX* context) {
1009         if (context == (SHA384_CTX*)0) {
1010                 return;
1011         }
1012         MEMCPY_BCOPY(context->state, sha384_initial_hash_value, SHA512_DIGEST_LENGTH);
1013         MEMSET_BZERO(context->buffer, SHA384_BLOCK_LENGTH);
1014         context->bitcount[0] = context->bitcount[1] = 0;
1015 }
1016
1017 void SHA384_Update(SHA384_CTX* context, const sha2_byte* data, size_t len) {
1018         SHA512_Update((SHA512_CTX*)context, data, len);
1019 }
1020
1021 void SHA384_Final(sha2_byte digest[], SHA384_CTX* context) {
1022         sha2_word64     *d = (sha2_word64*)digest;
1023
1024         /* Sanity check: */
1025         assert(context != (SHA384_CTX*)0);
1026
1027         /* If no digest buffer is passed, we don't bother doing this: */
1028         if (digest != (sha2_byte*)0) {
1029                 SHA512_Last((SHA512_CTX*)context);
1030
1031                 /* Save the hash data for output: */
1032 #if BYTE_ORDER == LITTLE_ENDIAN
1033                 {
1034                         /* Convert TO host byte order */
1035                         int     j;
1036                         for (j = 0; j < 6; j++) {
1037                                 REVERSE64(context->state[j],context->state[j]);
1038                                 *d++ = context->state[j];
1039                         }
1040                 }
1041 #else
1042                 MEMCPY_BCOPY(d, context->state, SHA384_DIGEST_LENGTH);
1043 #endif
1044         }
1045
1046         /* Zero out state data */
1047         MEMSET_BZERO(context, sizeof(*context));
1048 }
1049
1050 char *SHA384_End(SHA384_CTX* context, char buffer[]) {
1051         sha2_byte       digest[SHA384_DIGEST_LENGTH], *d = digest;
1052         int             i;
1053
1054         /* Sanity check: */
1055         assert(context != (SHA384_CTX*)0);
1056
1057         if (buffer != (char*)0) {
1058                 SHA384_Final(digest, context);
1059
1060                 for (i = 0; i < SHA384_DIGEST_LENGTH; i++) {
1061                         *buffer++ = sha2_hex_digits[(*d & 0xf0) >> 4];
1062                         *buffer++ = sha2_hex_digits[*d & 0x0f];
1063                         d++;
1064                 }
1065                 *buffer = (char)0;
1066         } else {
1067                 MEMSET_BZERO(context, sizeof(*context));
1068         }
1069         MEMSET_BZERO(digest, SHA384_DIGEST_LENGTH);
1070         return buffer;
1071 }
1072
1073 char* SHA384_Data(const sha2_byte* data, size_t len, char digest[SHA384_DIGEST_STRING_LENGTH]) {
1074         SHA384_CTX      context;
1075
1076         SHA384_Init(&context);
1077         SHA384_Update(&context, data, len);
1078         return SHA384_End(&context, digest);
1079 }
1080