contrib/bind-9.5.2/lib/isc/sha2.c

   1 /*
   2  * Copyright (C) 2005-2007, 2009  Internet Systems Consortium, Inc. ("ISC")
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
   9  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  10  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  11  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  12  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  13  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  14  * PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 /* $Id: sha2.c,v 1.13.128.2 2009/01/19 23:47:03 tbox Exp $ */
  18
  19 /*      $FreeBSD: src/sys/crypto/sha2/sha2.c,v 1.2.2.2 2002/03/05 08:36:47 ume Exp $    */
  20 /*      $KAME: sha2.c,v 1.8 2001/11/08 01:07:52 itojun Exp $    */
  21
  22 /*
  23  * sha2.c
  24  *
  25  * Version 1.0.0beta1
  26  *
  27  * Written by Aaron D. Gifford <me@aarongifford.com>
  28  *
  29  * Copyright 2000 Aaron D. Gifford.  All rights reserved.
  30  *
  31  * Redistribution and use in source and binary forms, with or without
  32  * modification, are permitted provided that the following conditions
  33  * are met:
  34  * 1. Redistributions of source code must retain the above copyright
  35  *    notice, this list of conditions and the following disclaimer.
  36  * 2. Redistributions in binary form must reproduce the above copyright
  37  *    notice, this list of conditions and the following disclaimer in the
  38  *    documentation and/or other materials provided with the distribution.
  39  * 3. Neither the name of the copyright holder nor the names of contributors
  40  *    may be used to endorse or promote products derived from this software
  41  *    without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) AND CONTRIBUTOR(S) ``AS IS'' AND
  44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR(S) OR CONTRIBUTOR(S) BE LIABLE
  47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  53  * SUCH DAMAGE.
  54  *
  55  */
  56
  57
  58 #include <config.h>
  59
  60 #include <isc/assertions.h>
  61 #include <isc/sha2.h>
  62 #include <isc/string.h>
  63 #include <isc/util.h>
  64
  65 /*
  66  * UNROLLED TRANSFORM LOOP NOTE:
  67  * You can define SHA2_UNROLL_TRANSFORM to use the unrolled transform
  68  * loop version for the hash transform rounds (defined using macros
  69  * later in this file).  Either define on the command line, for example:
  70  *
  71  *   cc -DISC_SHA2_UNROLL_TRANSFORM -o sha2 sha2.c sha2prog.c
  72  *
  73  * or define below:
  74  *
  75  *   \#define ISC_SHA2_UNROLL_TRANSFORM
  76  *
  77  */
  78
  79 /*** SHA-256/384/512 Machine Architecture Definitions *****************/
  80 /*
  81  * BYTE_ORDER NOTE:
  82  *
  83  * Please make sure that your system defines BYTE_ORDER.  If your
  84  * architecture is little-endian, make sure it also defines
  85  * LITTLE_ENDIAN and that the two (BYTE_ORDER and LITTLE_ENDIAN) are
  86  * equivalent.
  87  *
  88  * If your system does not define the above, then you can do so by
  89  * hand like this:
  90  *
  91  *   \#define LITTLE_ENDIAN 1234
  92  *   \#define BIG_ENDIAN    4321
  93  *
  94  * And for little-endian machines, add:
  95  *
  96  *   \#define BYTE_ORDER LITTLE_ENDIAN
  97  *
  98  * Or for big-endian machines:
  99  *
 100  *   \#define BYTE_ORDER BIG_ENDIAN
 101  *
 102  * The FreeBSD machine this was written on defines BYTE_ORDER
 103  * appropriately by including <sys/types.h> (which in turn includes
 104  * <machine/endian.h> where the appropriate definitions are actually
 105  * made).
 106  */
 107 #if !defined(BYTE_ORDER) || (BYTE_ORDER != LITTLE_ENDIAN && BYTE_ORDER != BIG_ENDIAN)
 108 #ifndef BYTE_ORDER
 109 #ifndef BIG_ENDIAN
 110 #define BIG_ENDIAN 4321
 111 #endif
 112 #ifndef LITTLE_ENDIAN
 113 #define LITTLE_ENDIAN 1234
 114 #endif
 115 #ifdef WORDS_BIGENDIAN
 116 #define BYTE_ORDER BIG_ENDIAN
 117 #else
 118 #define BYTE_ORDER LITTLE_ENDIAN
 119 #endif
 120 #else
 121 #error Define BYTE_ORDER to be equal to either LITTLE_ENDIAN or BIG_ENDIAN
 122 #endif
 123 #endif
 124
 125 /*** SHA-256/384/512 Various Length Definitions ***********************/
 126 /* NOTE: Most of these are in sha2.h */
 127 #define ISC_SHA256_SHORT_BLOCK_LENGTH   (ISC_SHA256_BLOCK_LENGTH - 8)
 128 #define ISC_SHA384_SHORT_BLOCK_LENGTH   (ISC_SHA384_BLOCK_LENGTH - 16)
 129 #define ISC_SHA512_SHORT_BLOCK_LENGTH   (ISC_SHA512_BLOCK_LENGTH - 16)
 130
 131
 132 /*** ENDIAN REVERSAL MACROS *******************************************/
 133 #if BYTE_ORDER == LITTLE_ENDIAN
 134 #define REVERSE32(w,x)  { \
 135         isc_uint32_t tmp = (w); \
 136         tmp = (tmp >> 16) | (tmp << 16); \
 137         (x) = ((tmp & 0xff00ff00UL) >> 8) | ((tmp & 0x00ff00ffUL) << 8); \
 138 }
 139 #ifdef WIN32
 140 #define REVERSE64(w,x)  { \
 141         isc_uint64_t tmp = (w); \
 142         tmp = (tmp >> 32) | (tmp << 32); \
 143         tmp = ((tmp & 0xff00ff00ff00ff00UL) >> 8) | \
 144               ((tmp & 0x00ff00ff00ff00ffUL) << 8); \
 145         (x) = ((tmp & 0xffff0000ffff0000UL) >> 16) | \
 146               ((tmp & 0x0000ffff0000ffffUL) << 16); \
 147 }
 148 #else
 149 #define REVERSE64(w,x)  { \
 150         isc_uint64_t tmp = (w); \
 151         tmp = (tmp >> 32) | (tmp << 32); \
 152         tmp = ((tmp & 0xff00ff00ff00ff00ULL) >> 8) | \
 153               ((tmp & 0x00ff00ff00ff00ffULL) << 8); \
 154         (x) = ((tmp & 0xffff0000ffff0000ULL) >> 16) | \
 155               ((tmp & 0x0000ffff0000ffffULL) << 16); \
 156 }
 157 #endif
 158 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
 159
 160 /*
 161  * Macro for incrementally adding the unsigned 64-bit integer n to the
 162  * unsigned 128-bit integer (represented using a two-element array of
 163  * 64-bit words):
 164  */
 165 #define ADDINC128(w,n)  { \
 166         (w)[0] += (isc_uint64_t)(n); \
 167         if ((w)[0] < (n)) { \
 168                 (w)[1]++; \
 169         } \
 170 }
 171
 172 /*** THE SIX LOGICAL FUNCTIONS ****************************************/
 173 /*
 174  * Bit shifting and rotation (used by the six SHA-XYZ logical functions:
 175  *
 176  *   NOTE:  The naming of R and S appears backwards here (R is a SHIFT and
 177  *   S is a ROTATION) because the SHA-256/384/512 description document
 178  *   (see http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf) uses this
 179  *   same "backwards" definition.
 180  */
 181 /* Shift-right (used in SHA-256, SHA-384, and SHA-512): */
 182 #define R(b,x)          ((x) >> (b))
 183 /* 32-bit Rotate-right (used in SHA-256): */
 184 #define S32(b,x)        (((x) >> (b)) | ((x) << (32 - (b))))
 185 /* 64-bit Rotate-right (used in SHA-384 and SHA-512): */
 186 #define S64(b,x)        (((x) >> (b)) | ((x) << (64 - (b))))
 187
 188 /* Two of six logical functions used in SHA-256, SHA-384, and SHA-512: */
 189 #define Ch(x,y,z)       (((x) & (y)) ^ ((~(x)) & (z)))
 190 #define Maj(x,y,z)      (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
 191
 192 /* Four of six logical functions used in SHA-256: */
 193 #define Sigma0_256(x)   (S32(2,  (x)) ^ S32(13, (x)) ^ S32(22, (x)))
 194 #define Sigma1_256(x)   (S32(6,  (x)) ^ S32(11, (x)) ^ S32(25, (x)))
 195 #define sigma0_256(x)   (S32(7,  (x)) ^ S32(18, (x)) ^ R(3 ,   (x)))
 196 #define sigma1_256(x)   (S32(17, (x)) ^ S32(19, (x)) ^ R(10,   (x)))
 197
 198 /* Four of six logical functions used in SHA-384 and SHA-512: */
 199 #define Sigma0_512(x)   (S64(28, (x)) ^ S64(34, (x)) ^ S64(39, (x)))
 200 #define Sigma1_512(x)   (S64(14, (x)) ^ S64(18, (x)) ^ S64(41, (x)))
 201 #define sigma0_512(x)   (S64( 1, (x)) ^ S64( 8, (x)) ^ R( 7,   (x)))
 202 #define sigma1_512(x)   (S64(19, (x)) ^ S64(61, (x)) ^ R( 6,   (x)))
 203
 204 /*** INTERNAL FUNCTION PROTOTYPES *************************************/
 205 /* NOTE: These should not be accessed directly from outside this
 206  * library -- they are intended for private internal visibility/use
 207  * only.
 208  */
 209 void isc_sha512_last(isc_sha512_t *);
 210 void isc_sha256_transform(isc_sha256_t *, const isc_uint32_t*);
 211 void isc_sha512_transform(isc_sha512_t *, const isc_uint64_t*);
 212
 213
 214 /*** SHA-XYZ INITIAL HASH VALUES AND CONSTANTS ************************/
 215 /* Hash constant words K for SHA-224 and SHA-256: */
 216 static const isc_uint32_t K256[64] = {
 217         0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL,
 218         0x3956c25bUL, 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL,
 219         0xd807aa98UL, 0x12835b01UL, 0x243185beUL, 0x550c7dc3UL,
 220         0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL, 0xc19bf174UL,
 221         0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
 222         0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL,
 223         0x983e5152UL, 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL,
 224         0xc6e00bf3UL, 0xd5a79147UL, 0x06ca6351UL, 0x14292967UL,
 225         0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL, 0x53380d13UL,
 226         0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
 227         0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL,
 228         0xd192e819UL, 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL,
 229         0x19a4c116UL, 0x1e376c08UL, 0x2748774cUL, 0x34b0bcb5UL,
 230         0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL, 0x682e6ff3UL,
 231         0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
 232         0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL
 233 };
 234
 235 /* Initial hash value H for SHA-224: */
 236 static const isc_uint32_t sha224_initial_hash_value[8] = {
 237         0xc1059ed8UL,
 238         0x367cd507UL,
 239         0x3070dd17UL,
 240         0xf70e5939UL,
 241         0xffc00b31UL,
 242         0x68581511UL,
 243         0x64f98fa7UL,
 244         0xbefa4fa4UL
 245 };
 246
 247 /* Initial hash value H for SHA-256: */
 248 static const isc_uint32_t sha256_initial_hash_value[8] = {
 249         0x6a09e667UL,
 250         0xbb67ae85UL,
 251         0x3c6ef372UL,
 252         0xa54ff53aUL,
 253         0x510e527fUL,
 254         0x9b05688cUL,
 255         0x1f83d9abUL,
 256         0x5be0cd19UL
 257 };
 258
 259 #ifdef WIN32
 260 /* Hash constant words K for SHA-384 and SHA-512: */
 261 static const isc_uint64_t K512[80] = {
 262         0x428a2f98d728ae22UL, 0x7137449123ef65cdUL,
 263         0xb5c0fbcfec4d3b2fUL, 0xe9b5dba58189dbbcUL,
 264         0x3956c25bf348b538UL, 0x59f111f1b605d019UL,
 265         0x923f82a4af194f9bUL, 0xab1c5ed5da6d8118UL,
 266         0xd807aa98a3030242UL, 0x12835b0145706fbeUL,
 267         0x243185be4ee4b28cUL, 0x550c7dc3d5ffb4e2UL,
 268         0x72be5d74f27b896fUL, 0x80deb1fe3b1696b1UL,
 269         0x9bdc06a725c71235UL, 0xc19bf174cf692694UL,
 270         0xe49b69c19ef14ad2UL, 0xefbe4786384f25e3UL,
 271         0x0fc19dc68b8cd5b5UL, 0x240ca1cc77ac9c65UL,
 272         0x2de92c6f592b0275UL, 0x4a7484aa6ea6e483UL,
 273         0x5cb0a9dcbd41fbd4UL, 0x76f988da831153b5UL,
 274         0x983e5152ee66dfabUL, 0xa831c66d2db43210UL,
 275         0xb00327c898fb213fUL, 0xbf597fc7beef0ee4UL,
 276         0xc6e00bf33da88fc2UL, 0xd5a79147930aa725UL,
 277         0x06ca6351e003826fUL, 0x142929670a0e6e70UL,
 278         0x27b70a8546d22ffcUL, 0x2e1b21385c26c926UL,
 279         0x4d2c6dfc5ac42aedUL, 0x53380d139d95b3dfUL,
 280         0x650a73548baf63deUL, 0x766a0abb3c77b2a8UL,
 281         0x81c2c92e47edaee6UL, 0x92722c851482353bUL,
 282         0xa2bfe8a14cf10364UL, 0xa81a664bbc423001UL,
 283         0xc24b8b70d0f89791UL, 0xc76c51a30654be30UL,
 284         0xd192e819d6ef5218UL, 0xd69906245565a910UL,
 285         0xf40e35855771202aUL, 0x106aa07032bbd1b8UL,
 286         0x19a4c116b8d2d0c8UL, 0x1e376c085141ab53UL,
 287         0x2748774cdf8eeb99UL, 0x34b0bcb5e19b48a8UL,
 288         0x391c0cb3c5c95a63UL, 0x4ed8aa4ae3418acbUL,
 289         0x5b9cca4f7763e373UL, 0x682e6ff3d6b2b8a3UL,
 290         0x748f82ee5defb2fcUL, 0x78a5636f43172f60UL,
 291         0x84c87814a1f0ab72UL, 0x8cc702081a6439ecUL,
 292         0x90befffa23631e28UL, 0xa4506cebde82bde9UL,
 293         0xbef9a3f7b2c67915UL, 0xc67178f2e372532bUL,
 294         0xca273eceea26619cUL, 0xd186b8c721c0c207UL,
 295         0xeada7dd6cde0eb1eUL, 0xf57d4f7fee6ed178UL,
 296         0x06f067aa72176fbaUL, 0x0a637dc5a2c898a6UL,
 297         0x113f9804bef90daeUL, 0x1b710b35131c471bUL,
 298         0x28db77f523047d84UL, 0x32caab7b40c72493UL,
 299         0x3c9ebe0a15c9bebcUL, 0x431d67c49c100d4cUL,
 300         0x4cc5d4becb3e42b6UL, 0x597f299cfc657e2aUL,
 301         0x5fcb6fab3ad6faecUL, 0x6c44198c4a475817UL
 302 };
 303
 304 /* Initial hash value H for SHA-384: */
 305 static const isc_uint64_t sha384_initial_hash_value[8] = {
 306         0xcbbb9d5dc1059ed8UL,
 307         0x629a292a367cd507UL,
 308         0x9159015a3070dd17UL,
 309         0x152fecd8f70e5939UL,
 310         0x67332667ffc00b31UL,
 311         0x8eb44a8768581511UL,
 312         0xdb0c2e0d64f98fa7UL,
 313         0x47b5481dbefa4fa4UL
 314 };
 315
 316 /* Initial hash value H for SHA-512: */
 317 static const isc_uint64_t sha512_initial_hash_value[8] = {
 318         0x6a09e667f3bcc908U,
 319         0xbb67ae8584caa73bUL,
 320         0x3c6ef372fe94f82bUL,
 321         0xa54ff53a5f1d36f1UL,
 322         0x510e527fade682d1UL,
 323         0x9b05688c2b3e6c1fUL,
 324         0x1f83d9abfb41bd6bUL,
 325         0x5be0cd19137e2179UL
 326 };
 327 #else
 328 /* Hash constant words K for SHA-384 and SHA-512: */
 329 static const isc_uint64_t K512[80] = {
 330         0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL,
 331         0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL,
 332         0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
 333         0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL,
 334         0xd807aa98a3030242ULL, 0x12835b0145706fbeULL,
 335         0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
 336         0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL,
 337         0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL,
 338         0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
 339         0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL,
 340         0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL,
 341         0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
 342         0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL,
 343         0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL,
 344         0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
 345         0x06ca6351e003826fULL, 0x142929670a0e6e70ULL,
 346         0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL,
 347         0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
 348         0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL,
 349         0x81c2c92e47edaee6ULL, 0x92722c851482353bULL,
 350         0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
 351         0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL,
 352         0xd192e819d6ef5218ULL, 0xd69906245565a910ULL,
 353         0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
 354         0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL,
 355         0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL,
 356         0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
 357         0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL,
 358         0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL,
 359         0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
 360         0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL,
 361         0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL,
 362         0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
 363         0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL,
 364         0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL,
 365         0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
 366         0x28db77f523047d84ULL, 0x32caab7b40c72493ULL,
 367         0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL,
 368         0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
 369         0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL
 370 };
 371
 372 /* Initial hash value H for SHA-384: */
 373 static const isc_uint64_t sha384_initial_hash_value[8] = {
 374         0xcbbb9d5dc1059ed8ULL,
 375         0x629a292a367cd507ULL,
 376         0x9159015a3070dd17ULL,
 377         0x152fecd8f70e5939ULL,
 378         0x67332667ffc00b31ULL,
 379         0x8eb44a8768581511ULL,
 380         0xdb0c2e0d64f98fa7ULL,
 381         0x47b5481dbefa4fa4ULL
 382 };
 383
 384 /* Initial hash value H for SHA-512: */
 385 static const isc_uint64_t sha512_initial_hash_value[8] = {
 386         0x6a09e667f3bcc908ULL,
 387         0xbb67ae8584caa73bULL,
 388         0x3c6ef372fe94f82bULL,
 389         0xa54ff53a5f1d36f1ULL,
 390         0x510e527fade682d1ULL,
 391         0x9b05688c2b3e6c1fULL,
 392         0x1f83d9abfb41bd6bULL,
 393         0x5be0cd19137e2179ULL
 394 };
 395 #endif
 396
 397 /*
 398  * Constant used by SHA256/384/512_End() functions for converting the
 399  * digest to a readable hexadecimal character string:
 400  */
 401 static const char *sha2_hex_digits = "0123456789abcdef";
 402
 403
 404
 405 /*** SHA-224: *********************************************************/
 406 void
 407 isc_sha224_init(isc_sha224_t *context) {
 408         if (context == (isc_sha256_t *)0) {
 409                 return;
 410         }
 411         memcpy(context->state, sha224_initial_hash_value,
 412                ISC_SHA256_DIGESTLENGTH);
 413         memset(context->buffer, 0, ISC_SHA256_BLOCK_LENGTH);
 414         context->bitcount = 0;
 415 }
 416
 417 void
 418 isc_sha224_update(isc_sha224_t *context, const isc_uint8_t* data, size_t len) {
 419         isc_sha256_update((isc_sha256_t *)context, data, len);
 420 }
 421
 422 void
 423 isc_sha224_final(isc_uint8_t digest[], isc_sha224_t *context) {
 424         isc_uint8_t sha256_digest[ISC_SHA256_DIGESTLENGTH];
 425         isc_sha256_final(sha256_digest, (isc_sha256_t *)context);
 426         memcpy(digest, sha256_digest, ISC_SHA224_DIGESTLENGTH);
 427         memset(sha256_digest, 0, ISC_SHA256_DIGESTLENGTH);
 428 }
 429
 430 char *
 431 isc_sha224_end(isc_sha224_t *context, char buffer[]) {
 432         isc_uint8_t     digest[ISC_SHA224_DIGESTLENGTH], *d = digest;
 433         unsigned int    i;
 434
 435         /* Sanity check: */
 436         REQUIRE(context != (isc_sha224_t *)0);
 437
 438         if (buffer != (char*)0) {
 439                 isc_sha224_final(digest, context);
 440
 441                 for (i = 0; i < ISC_SHA224_DIGESTLENGTH; i++) {
 442                         *buffer++ = sha2_hex_digits[(*d & 0xf0) >> 4];
 443                         *buffer++ = sha2_hex_digits[*d & 0x0f];
 444                         d++;
 445                 }
 446                 *buffer = (char)0;
 447         } else {
 448                 memset(context, 0, sizeof(context));
 449         }
 450         memset(digest, 0, ISC_SHA224_DIGESTLENGTH);
 451         return buffer;
 452 }
 453
 454 char*
 455 isc_sha224_data(const isc_uint8_t *data, size_t len,
 456                 char digest[ISC_SHA224_DIGESTSTRINGLENGTH])
 457 {
 458         isc_sha224_t context;
 459
 460         isc_sha224_init(&context);
 461         isc_sha224_update(&context, data, len);
 462         return (isc_sha224_end(&context, digest));
 463 }
 464
 465 /*** SHA-256: *********************************************************/
 466 void
 467 isc_sha256_init(isc_sha256_t *context) {
 468         if (context == (isc_sha256_t *)0) {
 469                 return;
 470         }
 471         memcpy(context->state, sha256_initial_hash_value,
 472                ISC_SHA256_DIGESTLENGTH);
 473         memset(context->buffer, 0, ISC_SHA256_BLOCK_LENGTH);
 474         context->bitcount = 0;
 475 }
 476
 477 #ifdef ISC_SHA2_UNROLL_TRANSFORM
 478
 479 /* Unrolled SHA-256 round macros: */
 480
 481 #if BYTE_ORDER == LITTLE_ENDIAN
 482
 483 #define ROUND256_0_TO_15(a,b,c,d,e,f,g,h)       \
 484         REVERSE32(*data++, W256[j]); \
 485         T1 = (h) + Sigma1_256(e) + Ch((e), (f), (g)) + \
 486              K256[j] + W256[j]; \
 487         (d) += T1; \
 488         (h) = T1 + Sigma0_256(a) + Maj((a), (b), (c)); \
 489         j++
 490
 491
 492 #else /* BYTE_ORDER == LITTLE_ENDIAN */
 493
 494 #define ROUND256_0_TO_15(a,b,c,d,e,f,g,h)       \
 495         T1 = (h) + Sigma1_256(e) + Ch((e), (f), (g)) + \
 496              K256[j] + (W256[j] = *data++); \
 497         (d) += T1; \
 498         (h) = T1 + Sigma0_256(a) + Maj((a), (b), (c)); \
 499         j++
 500
 501 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
 502
 503 #define ROUND256(a,b,c,d,e,f,g,h)       \
 504         s0 = W256[(j+1)&0x0f]; \
 505         s0 = sigma0_256(s0); \
 506         s1 = W256[(j+14)&0x0f]; \
 507         s1 = sigma1_256(s1); \
 508         T1 = (h) + Sigma1_256(e) + Ch((e), (f), (g)) + K256[j] + \
 509              (W256[j&0x0f] += s1 + W256[(j+9)&0x0f] + s0); \
 510         (d) += T1; \
 511         (h) = T1 + Sigma0_256(a) + Maj((a), (b), (c)); \
 512         j++
 513
 514 void isc_sha256_transform(isc_sha256_t *context, const isc_uint32_t* data) {
 515         isc_uint32_t    a, b, c, d, e, f, g, h, s0, s1;
 516         isc_uint32_t    T1, *W256;
 517         int             j;
 518
 519         W256 = (isc_uint32_t*)context->buffer;
 520
 521         /* Initialize registers with the prev. intermediate value */
 522         a = context->state[0];
 523         b = context->state[1];
 524         c = context->state[2];
 525         d = context->state[3];
 526         e = context->state[4];
 527         f = context->state[5];
 528         g = context->state[6];
 529         h = context->state[7];
 530
 531         j = 0;
 532         do {
 533                 /* Rounds 0 to 15 (unrolled): */
 534                 ROUND256_0_TO_15(a,b,c,d,e,f,g,h);
 535                 ROUND256_0_TO_15(h,a,b,c,d,e,f,g);
 536                 ROUND256_0_TO_15(g,h,a,b,c,d,e,f);
 537                 ROUND256_0_TO_15(f,g,h,a,b,c,d,e);
 538                 ROUND256_0_TO_15(e,f,g,h,a,b,c,d);
 539                 ROUND256_0_TO_15(d,e,f,g,h,a,b,c);
 540                 ROUND256_0_TO_15(c,d,e,f,g,h,a,b);
 541                 ROUND256_0_TO_15(b,c,d,e,f,g,h,a);
 542         } while (j < 16);
 543
 544         /* Now for the remaining rounds to 64: */
 545         do {
 546                 ROUND256(a,b,c,d,e,f,g,h);
 547                 ROUND256(h,a,b,c,d,e,f,g);
 548                 ROUND256(g,h,a,b,c,d,e,f);
 549                 ROUND256(f,g,h,a,b,c,d,e);
 550                 ROUND256(e,f,g,h,a,b,c,d);
 551                 ROUND256(d,e,f,g,h,a,b,c);
 552                 ROUND256(c,d,e,f,g,h,a,b);
 553                 ROUND256(b,c,d,e,f,g,h,a);
 554         } while (j < 64);
 555
 556         /* Compute the current intermediate hash value */
 557         context->state[0] += a;
 558         context->state[1] += b;
 559         context->state[2] += c;
 560         context->state[3] += d;
 561         context->state[4] += e;
 562         context->state[5] += f;
 563         context->state[6] += g;
 564         context->state[7] += h;
 565
 566         /* Clean up */
 567         a = b = c = d = e = f = g = h = T1 = 0;
 568 }
 569
 570 #else /* ISC_SHA2_UNROLL_TRANSFORM */
 571
 572 void
 573 isc_sha256_transform(isc_sha256_t *context, const isc_uint32_t* data) {
 574         isc_uint32_t    a, b, c, d, e, f, g, h, s0, s1;
 575         isc_uint32_t    T1, T2, *W256;
 576         int             j;
 577
 578         W256 = (isc_uint32_t*)context->buffer;
 579
 580         /* Initialize registers with the prev. intermediate value */
 581         a = context->state[0];
 582         b = context->state[1];
 583         c = context->state[2];
 584         d = context->state[3];
 585         e = context->state[4];
 586         f = context->state[5];
 587         g = context->state[6];
 588         h = context->state[7];
 589
 590         j = 0;
 591         do {
 592 #if BYTE_ORDER == LITTLE_ENDIAN
 593                 /* Copy data while converting to host byte order */
 594                 REVERSE32(*data++,W256[j]);
 595                 /* Apply the SHA-256 compression function to update a..h */
 596                 T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] + W256[j];
 597 #else /* BYTE_ORDER == LITTLE_ENDIAN */
 598                 /* Apply the SHA-256 compression function to update a..h with copy */
 599                 T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] + (W256[j] = *data++);
 600 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
 601                 T2 = Sigma0_256(a) + Maj(a, b, c);
 602                 h = g;
 603                 g = f;
 604                 f = e;
 605                 e = d + T1;
 606                 d = c;
 607                 c = b;
 608                 b = a;
 609                 a = T1 + T2;
 610
 611                 j++;
 612         } while (j < 16);
 613
 614         do {
 615                 /* Part of the message block expansion: */
 616                 s0 = W256[(j+1)&0x0f];
 617                 s0 = sigma0_256(s0);
 618                 s1 = W256[(j+14)&0x0f];
 619                 s1 = sigma1_256(s1);
 620
 621                 /* Apply the SHA-256 compression function to update a..h */
 622                 T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] +
 623                      (W256[j&0x0f] += s1 + W256[(j+9)&0x0f] + s0);
 624                 T2 = Sigma0_256(a) + Maj(a, b, c);
 625                 h = g;
 626                 g = f;
 627                 f = e;
 628                 e = d + T1;
 629                 d = c;
 630                 c = b;
 631                 b = a;
 632                 a = T1 + T2;
 633
 634                 j++;
 635         } while (j < 64);
 636
 637         /* Compute the current intermediate hash value */
 638         context->state[0] += a;
 639         context->state[1] += b;
 640         context->state[2] += c;
 641         context->state[3] += d;
 642         context->state[4] += e;
 643         context->state[5] += f;
 644         context->state[6] += g;
 645         context->state[7] += h;
 646
 647         /* Clean up */
 648         a = b = c = d = e = f = g = h = T1 = T2 = 0;
 649 }
 650
 651 #endif /* ISC_SHA2_UNROLL_TRANSFORM */
 652
 653 void
 654 isc_sha256_update(isc_sha256_t *context, const isc_uint8_t *data, size_t len) {
 655         unsigned int    freespace, usedspace;
 656
 657         if (len == 0U) {
 658                 /* Calling with no data is valid - we do nothing */
 659                 return;
 660         }
 661
 662         /* Sanity check: */
 663         REQUIRE(context != (isc_sha256_t *)0 && data != (isc_uint8_t*)0);
 664
 665         usedspace = (unsigned int)((context->bitcount >> 3) %
 666                                    ISC_SHA256_BLOCK_LENGTH);
 667         if (usedspace > 0) {
 668                 /* Calculate how much free space is available in the buffer */
 669                 freespace = ISC_SHA256_BLOCK_LENGTH - usedspace;
 670
 671                 if (len >= freespace) {
 672                         /* Fill the buffer completely and process it */
 673                         memcpy(&context->buffer[usedspace], data, freespace);
 674                         context->bitcount += freespace << 3;
 675                         len -= freespace;
 676                         data += freespace;
 677                         isc_sha256_transform(context,
 678                                              (isc_uint32_t*)context->buffer);
 679                 } else {
 680                         /* The buffer is not yet full */
 681                         memcpy(&context->buffer[usedspace], data, len);
 682                         context->bitcount += len << 3;
 683                         /* Clean up: */
 684                         usedspace = freespace = 0;
 685                         return;
 686                 }
 687         }
 688         while (len >= ISC_SHA256_BLOCK_LENGTH) {
 689                 /* Process as many complete blocks as we can */
 690                 memcpy(context->buffer, data, ISC_SHA256_BLOCK_LENGTH);
 691                 isc_sha256_transform(context, (isc_uint32_t*)context->buffer);
 692                 context->bitcount += ISC_SHA256_BLOCK_LENGTH << 3;
 693                 len -= ISC_SHA256_BLOCK_LENGTH;
 694                 data += ISC_SHA256_BLOCK_LENGTH;
 695         }
 696         if (len > 0U) {
 697                 /* There's left-overs, so save 'em */
 698                 memcpy(context->buffer, data, len);
 699                 context->bitcount += len << 3;
 700         }
 701         /* Clean up: */
 702         usedspace = freespace = 0;
 703 }
 704
 705 void
 706 isc_sha256_final(isc_uint8_t digest[], isc_sha256_t *context) {
 707         isc_uint32_t    *d = (isc_uint32_t*)digest;
 708         unsigned int    usedspace;
 709
 710         /* Sanity check: */
 711         REQUIRE(context != (isc_sha256_t *)0);
 712
 713         /* If no digest buffer is passed, we don't bother doing this: */
 714         if (digest != (isc_uint8_t*)0) {
 715                 usedspace = (unsigned int)((context->bitcount >> 3) %
 716                                            ISC_SHA256_BLOCK_LENGTH);
 717 #if BYTE_ORDER == LITTLE_ENDIAN
 718                 /* Convert FROM host byte order */
 719                 REVERSE64(context->bitcount,context->bitcount);
 720 #endif
 721                 if (usedspace > 0) {
 722                         /* Begin padding with a 1 bit: */
 723                         context->buffer[usedspace++] = 0x80;
 724
 725                         if (usedspace <= ISC_SHA256_SHORT_BLOCK_LENGTH) {
 726                                 /* Set-up for the last transform: */
 727                                 memset(&context->buffer[usedspace], 0,
 728                                        ISC_SHA256_SHORT_BLOCK_LENGTH - usedspace);
 729                         } else {
 730                                 if (usedspace < ISC_SHA256_BLOCK_LENGTH) {
 731                                         memset(&context->buffer[usedspace], 0,
 732                                                ISC_SHA256_BLOCK_LENGTH -
 733                                                usedspace);
 734                                 }
 735                                 /* Do second-to-last transform: */
 736                                 isc_sha256_transform(context,
 737                                                (isc_uint32_t*)context->buffer);
 738
 739                                 /* And set-up for the last transform: */
 740                                 memset(context->buffer, 0,
 741                                        ISC_SHA256_SHORT_BLOCK_LENGTH);
 742                         }
 743                 } else {
 744                         /* Set-up for the last transform: */
 745                         memset(context->buffer, 0, ISC_SHA256_SHORT_BLOCK_LENGTH);
 746
 747                         /* Begin padding with a 1 bit: */
 748                         *context->buffer = 0x80;
 749                 }
 750                 /* Set the bit count: */
 751                 *(isc_uint64_t*)&context->buffer[ISC_SHA256_SHORT_BLOCK_LENGTH] = context->bitcount;
 752
 753                 /* Final transform: */
 754                 isc_sha256_transform(context, (isc_uint32_t*)context->buffer);
 755
 756 #if BYTE_ORDER == LITTLE_ENDIAN
 757                 {
 758                         /* Convert TO host byte order */
 759                         int     j;
 760                         for (j = 0; j < 8; j++) {
 761                                 REVERSE32(context->state[j],context->state[j]);
 762                                 *d++ = context->state[j];
 763                         }
 764                 }
 765 #else
 766                 memcpy(d, context->state, ISC_SHA256_DIGESTLENGTH);
 767 #endif
 768         }
 769
 770         /* Clean up state data: */
 771         memset(context, 0, sizeof(context));
 772         usedspace = 0;
 773 }
 774
 775 char *
 776 isc_sha256_end(isc_sha256_t *context, char buffer[]) {
 777         isc_uint8_t     digest[ISC_SHA256_DIGESTLENGTH], *d = digest;
 778         unsigned int    i;
 779
 780         /* Sanity check: */
 781         REQUIRE(context != (isc_sha256_t *)0);
 782
 783         if (buffer != (char*)0) {
 784                 isc_sha256_final(digest, context);
 785
 786                 for (i = 0; i < ISC_SHA256_DIGESTLENGTH; i++) {
 787                         *buffer++ = sha2_hex_digits[(*d & 0xf0) >> 4];
 788                         *buffer++ = sha2_hex_digits[*d & 0x0f];
 789                         d++;
 790                 }
 791                 *buffer = (char)0;
 792         } else {
 793                 memset(context, 0, sizeof(context));
 794         }
 795         memset(digest, 0, ISC_SHA256_DIGESTLENGTH);
 796         return buffer;
 797 }
 798
 799 char *
 800 isc_sha256_data(const isc_uint8_t* data, size_t len,
 801                 char digest[ISC_SHA256_DIGESTSTRINGLENGTH])
 802 {
 803         isc_sha256_t context;
 804
 805         isc_sha256_init(&context);
 806         isc_sha256_update(&context, data, len);
 807         return (isc_sha256_end(&context, digest));
 808 }
 809
 810
 811 /*** SHA-512: *********************************************************/
 812 void
 813 isc_sha512_init(isc_sha512_t *context) {
 814         if (context == (isc_sha512_t *)0) {
 815                 return;
 816         }
 817         memcpy(context->state, sha512_initial_hash_value,
 818                ISC_SHA512_DIGESTLENGTH);
 819         memset(context->buffer, 0, ISC_SHA512_BLOCK_LENGTH);
 820         context->bitcount[0] = context->bitcount[1] =  0;
 821 }
 822
 823 #ifdef ISC_SHA2_UNROLL_TRANSFORM
 824
 825 /* Unrolled SHA-512 round macros: */
 826 #if BYTE_ORDER == LITTLE_ENDIAN
 827
 828 #define ROUND512_0_TO_15(a,b,c,d,e,f,g,h)       \
 829         REVERSE64(*data++, W512[j]); \
 830         T1 = (h) + Sigma1_512(e) + Ch((e), (f), (g)) + \
 831              K512[j] + W512[j]; \
 832         (d) += T1, \
 833         (h) = T1 + Sigma0_512(a) + Maj((a), (b), (c)), \
 834         j++
 835
 836
 837 #else /* BYTE_ORDER == LITTLE_ENDIAN */
 838
 839 #define ROUND512_0_TO_15(a,b,c,d,e,f,g,h)       \
 840         T1 = (h) + Sigma1_512(e) + Ch((e), (f), (g)) + \
 841              K512[j] + (W512[j] = *data++); \
 842         (d) += T1; \
 843         (h) = T1 + Sigma0_512(a) + Maj((a), (b), (c)); \
 844         j++
 845
 846 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
 847
 848 #define ROUND512(a,b,c,d,e,f,g,h)       \
 849         s0 = W512[(j+1)&0x0f]; \
 850         s0 = sigma0_512(s0); \
 851         s1 = W512[(j+14)&0x0f]; \
 852         s1 = sigma1_512(s1); \
 853         T1 = (h) + Sigma1_512(e) + Ch((e), (f), (g)) + K512[j] + \
 854              (W512[j&0x0f] += s1 + W512[(j+9)&0x0f] + s0); \
 855         (d) += T1; \
 856         (h) = T1 + Sigma0_512(a) + Maj((a), (b), (c)); \
 857         j++
 858
 859 void isc_sha512_transform(isc_sha512_t *context, const isc_uint64_t* data) {
 860         isc_uint64_t    a, b, c, d, e, f, g, h, s0, s1;
 861         isc_uint64_t    T1, *W512 = (isc_uint64_t*)context->buffer;
 862         int             j;
 863
 864         /* Initialize registers with the prev. intermediate value */
 865         a = context->state[0];
 866         b = context->state[1];
 867         c = context->state[2];
 868         d = context->state[3];
 869         e = context->state[4];
 870         f = context->state[5];
 871         g = context->state[6];
 872         h = context->state[7];
 873
 874         j = 0;
 875         do {
 876                 ROUND512_0_TO_15(a,b,c,d,e,f,g,h);
 877                 ROUND512_0_TO_15(h,a,b,c,d,e,f,g);
 878                 ROUND512_0_TO_15(g,h,a,b,c,d,e,f);
 879                 ROUND512_0_TO_15(f,g,h,a,b,c,d,e);
 880                 ROUND512_0_TO_15(e,f,g,h,a,b,c,d);
 881                 ROUND512_0_TO_15(d,e,f,g,h,a,b,c);
 882                 ROUND512_0_TO_15(c,d,e,f,g,h,a,b);
 883                 ROUND512_0_TO_15(b,c,d,e,f,g,h,a);
 884         } while (j < 16);
 885
 886         /* Now for the remaining rounds up to 79: */
 887         do {
 888                 ROUND512(a,b,c,d,e,f,g,h);
 889                 ROUND512(h,a,b,c,d,e,f,g);
 890                 ROUND512(g,h,a,b,c,d,e,f);
 891                 ROUND512(f,g,h,a,b,c,d,e);
 892                 ROUND512(e,f,g,h,a,b,c,d);
 893                 ROUND512(d,e,f,g,h,a,b,c);
 894                 ROUND512(c,d,e,f,g,h,a,b);
 895                 ROUND512(b,c,d,e,f,g,h,a);
 896         } while (j < 80);
 897
 898         /* Compute the current intermediate hash value */
 899         context->state[0] += a;
 900         context->state[1] += b;
 901         context->state[2] += c;
 902         context->state[3] += d;
 903         context->state[4] += e;
 904         context->state[5] += f;
 905         context->state[6] += g;
 906         context->state[7] += h;
 907
 908         /* Clean up */
 909         a = b = c = d = e = f = g = h = T1 = 0;
 910 }
 911
 912 #else /* ISC_SHA2_UNROLL_TRANSFORM */
 913
 914 void
 915 isc_sha512_transform(isc_sha512_t *context, const isc_uint64_t* data) {
 916         isc_uint64_t    a, b, c, d, e, f, g, h, s0, s1;
 917         isc_uint64_t    T1, T2, *W512 = (isc_uint64_t*)context->buffer;
 918         int             j;
 919
 920         /* Initialize registers with the prev. intermediate value */
 921         a = context->state[0];
 922         b = context->state[1];
 923         c = context->state[2];
 924         d = context->state[3];
 925         e = context->state[4];
 926         f = context->state[5];
 927         g = context->state[6];
 928         h = context->state[7];
 929
 930         j = 0;
 931         do {
 932 #if BYTE_ORDER == LITTLE_ENDIAN
 933                 /* Convert TO host byte order */
 934                 REVERSE64(*data++, W512[j]);
 935                 /* Apply the SHA-512 compression function to update a..h */
 936                 T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] + W512[j];
 937 #else /* BYTE_ORDER == LITTLE_ENDIAN */
 938                 /* Apply the SHA-512 compression function to update a..h with copy */
 939                 T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] + (W512[j] = *data++);
 940 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
 941                 T2 = Sigma0_512(a) + Maj(a, b, c);
 942                 h = g;
 943                 g = f;
 944                 f = e;
 945                 e = d + T1;
 946                 d = c;
 947                 c = b;
 948                 b = a;
 949                 a = T1 + T2;
 950
 951                 j++;
 952         } while (j < 16);
 953
 954         do {
 955                 /* Part of the message block expansion: */
 956                 s0 = W512[(j+1)&0x0f];
 957                 s0 = sigma0_512(s0);
 958                 s1 = W512[(j+14)&0x0f];
 959                 s1 =  sigma1_512(s1);
 960
 961                 /* Apply the SHA-512 compression function to update a..h */
 962                 T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] +
 963                      (W512[j&0x0f] += s1 + W512[(j+9)&0x0f] + s0);
 964                 T2 = Sigma0_512(a) + Maj(a, b, c);
 965                 h = g;
 966                 g = f;
 967                 f = e;
 968                 e = d + T1;
 969                 d = c;
 970                 c = b;
 971                 b = a;
 972                 a = T1 + T2;
 973
 974                 j++;
 975         } while (j < 80);
 976
 977         /* Compute the current intermediate hash value */
 978         context->state[0] += a;
 979         context->state[1] += b;
 980         context->state[2] += c;
 981         context->state[3] += d;
 982         context->state[4] += e;
 983         context->state[5] += f;
 984         context->state[6] += g;
 985         context->state[7] += h;
 986
 987         /* Clean up */
 988         a = b = c = d = e = f = g = h = T1 = T2 = 0;
 989 }
 990
 991 #endif /* ISC_SHA2_UNROLL_TRANSFORM */
 992
 993 void isc_sha512_update(isc_sha512_t *context, const isc_uint8_t *data, size_t len) {
 994         unsigned int    freespace, usedspace;
 995
 996         if (len == 0U) {
 997                 /* Calling with no data is valid - we do nothing */
 998                 return;
 999         }
1000
1001         /* Sanity check: */
1002         REQUIRE(context != (isc_sha512_t *)0 && data != (isc_uint8_t*)0);
1003
1004         usedspace = (unsigned int)((context->bitcount[0] >> 3) %
1005                                    ISC_SHA512_BLOCK_LENGTH);
1006         if (usedspace > 0) {
1007                 /* Calculate how much free space is available in the buffer */
1008                 freespace = ISC_SHA512_BLOCK_LENGTH - usedspace;
1009
1010                 if (len >= freespace) {
1011                         /* Fill the buffer completely and process it */
1012                         memcpy(&context->buffer[usedspace], data, freespace);
1013                         ADDINC128(context->bitcount, freespace << 3);
1014                         len -= freespace;
1015                         data += freespace;
1016                         isc_sha512_transform(context,
1017                                              (isc_uint64_t*)context->buffer);
1018                 } else {
1019                         /* The buffer is not yet full */
1020                         memcpy(&context->buffer[usedspace], data, len);
1021                         ADDINC128(context->bitcount, len << 3);
1022                         /* Clean up: */
1023                         usedspace = freespace = 0;
1024                         return;
1025                 }
1026         }
1027         while (len >= ISC_SHA512_BLOCK_LENGTH) {
1028                 /* Process as many complete blocks as we can */
1029                 memcpy(context->buffer, data, ISC_SHA512_BLOCK_LENGTH);
1030                 isc_sha512_transform(context, (isc_uint64_t*)context->buffer);
1031                 ADDINC128(context->bitcount, ISC_SHA512_BLOCK_LENGTH << 3);
1032                 len -= ISC_SHA512_BLOCK_LENGTH;
1033                 data += ISC_SHA512_BLOCK_LENGTH;
1034         }
1035         if (len > 0U) {
1036                 /* There's left-overs, so save 'em */
1037                 memcpy(context->buffer, data, len);
1038                 ADDINC128(context->bitcount, len << 3);
1039         }
1040         /* Clean up: */
1041         usedspace = freespace = 0;
1042 }
1043
1044 void isc_sha512_last(isc_sha512_t *context) {
1045         unsigned int    usedspace;
1046
1047         usedspace = (unsigned int)((context->bitcount[0] >> 3) %
1048                                     ISC_SHA512_BLOCK_LENGTH);
1049 #if BYTE_ORDER == LITTLE_ENDIAN
1050         /* Convert FROM host byte order */
1051         REVERSE64(context->bitcount[0],context->bitcount[0]);
1052         REVERSE64(context->bitcount[1],context->bitcount[1]);
1053 #endif
1054         if (usedspace > 0) {
1055                 /* Begin padding with a 1 bit: */
1056                 context->buffer[usedspace++] = 0x80;
1057
1058                 if (usedspace <= ISC_SHA512_SHORT_BLOCK_LENGTH) {
1059                         /* Set-up for the last transform: */
1060                         memset(&context->buffer[usedspace], 0,
1061                                ISC_SHA512_SHORT_BLOCK_LENGTH - usedspace);
1062                 } else {
1063                         if (usedspace < ISC_SHA512_BLOCK_LENGTH) {
1064                                 memset(&context->buffer[usedspace], 0,
1065                                        ISC_SHA512_BLOCK_LENGTH - usedspace);
1066                         }
1067                         /* Do second-to-last transform: */
1068                         isc_sha512_transform(context,
1069                                             (isc_uint64_t*)context->buffer);
1070
1071                         /* And set-up for the last transform: */
1072                         memset(context->buffer, 0, ISC_SHA512_BLOCK_LENGTH - 2);
1073                 }
1074         } else {
1075                 /* Prepare for final transform: */
1076                 memset(context->buffer, 0, ISC_SHA512_SHORT_BLOCK_LENGTH);
1077
1078                 /* Begin padding with a 1 bit: */
1079                 *context->buffer = 0x80;
1080         }
1081         /* Store the length of input data (in bits): */
1082         *(isc_uint64_t*)&context->buffer[ISC_SHA512_SHORT_BLOCK_LENGTH] = context->bitcount[1];
1083         *(isc_uint64_t*)&context->buffer[ISC_SHA512_SHORT_BLOCK_LENGTH+8] = context->bitcount[0];
1084
1085         /* Final transform: */
1086         isc_sha512_transform(context, (isc_uint64_t*)context->buffer);
1087 }
1088
1089 void isc_sha512_final(isc_uint8_t digest[], isc_sha512_t *context) {
1090         isc_uint64_t    *d = (isc_uint64_t*)digest;
1091
1092         /* Sanity check: */
1093         REQUIRE(context != (isc_sha512_t *)0);
1094
1095         /* If no digest buffer is passed, we don't bother doing this: */
1096         if (digest != (isc_uint8_t*)0) {
1097                 isc_sha512_last(context);
1098
1099                 /* Save the hash data for output: */
1100 #if BYTE_ORDER == LITTLE_ENDIAN
1101                 {
1102                         /* Convert TO host byte order */
1103                         int     j;
1104                         for (j = 0; j < 8; j++) {
1105                                 REVERSE64(context->state[j],context->state[j]);
1106                                 *d++ = context->state[j];
1107                         }
1108                 }
1109 #else
1110                 memcpy(d, context->state, ISC_SHA512_DIGESTLENGTH);
1111 #endif
1112         }
1113
1114         /* Zero out state data */
1115         memset(context, 0, sizeof(context));
1116 }
1117
1118 char *
1119 isc_sha512_end(isc_sha512_t *context, char buffer[]) {
1120         isc_uint8_t     digest[ISC_SHA512_DIGESTLENGTH], *d = digest;
1121         unsigned int    i;
1122
1123         /* Sanity check: */
1124         REQUIRE(context != (isc_sha512_t *)0);
1125
1126         if (buffer != (char*)0) {
1127                 isc_sha512_final(digest, context);
1128
1129                 for (i = 0; i < ISC_SHA512_DIGESTLENGTH; i++) {
1130                         *buffer++ = sha2_hex_digits[(*d & 0xf0) >> 4];
1131                         *buffer++ = sha2_hex_digits[*d & 0x0f];
1132                         d++;
1133                 }
1134                 *buffer = (char)0;
1135         } else {
1136                 memset(context, 0, sizeof(context));
1137         }
1138         memset(digest, 0, ISC_SHA512_DIGESTLENGTH);
1139         return buffer;
1140 }
1141
1142 char *
1143 isc_sha512_data(const isc_uint8_t *data, size_t len,
1144                 char digest[ISC_SHA512_DIGESTSTRINGLENGTH])
1145 {
1146         isc_sha512_t    context;
1147
1148         isc_sha512_init(&context);
1149         isc_sha512_update(&context, data, len);
1150         return (isc_sha512_end(&context, digest));
1151 }
1152
1153
1154 /*** SHA-384: *********************************************************/
1155 void
1156 isc_sha384_init(isc_sha384_t *context) {
1157         if (context == (isc_sha384_t *)0) {
1158                 return;
1159         }
1160         memcpy(context->state, sha384_initial_hash_value,
1161                ISC_SHA512_DIGESTLENGTH);
1162         memset(context->buffer, 0, ISC_SHA384_BLOCK_LENGTH);
1163         context->bitcount[0] = context->bitcount[1] = 0;
1164 }
1165
1166 void
1167 isc_sha384_update(isc_sha384_t *context, const isc_uint8_t* data, size_t len) {
1168         isc_sha512_update((isc_sha512_t *)context, data, len);
1169 }
1170
1171 void
1172 isc_sha384_final(isc_uint8_t digest[], isc_sha384_t *context) {
1173         isc_uint64_t    *d = (isc_uint64_t*)digest;
1174
1175         /* Sanity check: */
1176         REQUIRE(context != (isc_sha384_t *)0);
1177
1178         /* If no digest buffer is passed, we don't bother doing this: */
1179         if (digest != (isc_uint8_t*)0) {
1180                 isc_sha512_last((isc_sha512_t *)context);
1181
1182                 /* Save the hash data for output: */
1183 #if BYTE_ORDER == LITTLE_ENDIAN
1184                 {
1185                         /* Convert TO host byte order */
1186                         int     j;
1187                         for (j = 0; j < 6; j++) {
1188                                 REVERSE64(context->state[j],context->state[j]);
1189                                 *d++ = context->state[j];
1190                         }
1191                 }
1192 #else
1193                 memcpy(d, context->state, ISC_SHA384_DIGESTLENGTH);
1194 #endif
1195         }
1196
1197         /* Zero out state data */
1198         memset(context, 0, sizeof(context));
1199 }
1200
1201 char *
1202 isc_sha384_end(isc_sha384_t *context, char buffer[]) {
1203         isc_uint8_t     digest[ISC_SHA384_DIGESTLENGTH], *d = digest;
1204         unsigned int    i;
1205
1206         /* Sanity check: */
1207         REQUIRE(context != (isc_sha384_t *)0);
1208
1209         if (buffer != (char*)0) {
1210                 isc_sha384_final(digest, context);
1211
1212                 for (i = 0; i < ISC_SHA384_DIGESTLENGTH; i++) {
1213                         *buffer++ = sha2_hex_digits[(*d & 0xf0) >> 4];
1214                         *buffer++ = sha2_hex_digits[*d & 0x0f];
1215                         d++;
1216                 }
1217                 *buffer = (char)0;
1218         } else {
1219                 memset(context, 0, sizeof(context));
1220         }
1221         memset(digest, 0, ISC_SHA384_DIGESTLENGTH);
1222         return buffer;
1223 }
1224
1225 char*
1226 isc_sha384_data(const isc_uint8_t *data, size_t len,
1227                 char digest[ISC_SHA384_DIGESTSTRINGLENGTH])
1228 {
1229         isc_sha384_t context;
1230
1231         isc_sha384_init(&context);
1232         isc_sha384_update(&context, data, len);
1233         return (isc_sha384_end(&context, digest));
1234 }