crypto/apr_md4.c

   1 /* Licensed to the Apache Software Foundation (ASF) under one or more
   2  * contributor license agreements.  See the NOTICE file distributed with
   3  * this work for additional information regarding copyright ownership.
   4  * The ASF licenses this file to You under the Apache License, Version 2.0
   5  * (the "License"); you may not use this file except in compliance with
   6  * the License.  You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  *
  16  * This is derived from material copyright RSA Data Security, Inc.
  17  * Their notice is reproduced below in its entirety.
  18  *
  19  * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
  20  * rights reserved.
  21  *
  22  * License to copy and use this software is granted provided that it
  23  * is identified as the "RSA Data Security, Inc. MD4 Message-Digest
  24  * Algorithm" in all material mentioning or referencing this software
  25  * or this function.
  26  *
  27  * License is also granted to make and use derivative works provided
  28  * that such works are identified as "derived from the RSA Data
  29  * Security, Inc. MD4 Message-Digest Algorithm" in all material
  30  * mentioning or referencing the derived work.
  31  *
  32  * RSA Data Security, Inc. makes no representations concerning either
  33  * the merchantability of this software or the suitability of this
  34  * software for any particular purpose. It is provided "as is"
  35  * without express or implied warranty of any kind.
  36  *
  37  * These notices must be retained in any copies of any part of this
  38  * documentation and/or software.
  39  */
  40
  41 #include "apr_strings.h"
  42 #include "apr_md4.h"
  43 #include "apr_lib.h"
  44
  45 #if APR_HAVE_STRING_H
  46 #include <string.h>
  47 #endif
  48 #if APR_HAVE_UNISTD_H
  49 #include <unistd.h>
  50 #endif
  51
  52 /* Constants for MD4Transform routine.
  53  */
  54
  55 #define S11 3
  56 #define S12 7
  57 #define S13 11
  58 #define S14 19
  59 #define S21 3
  60 #define S22 5
  61 #define S23 9
  62 #define S24 13
  63 #define S31 3
  64 #define S32 9
  65 #define S33 11
  66 #define S34 15
  67
  68 static void MD4Transform(apr_uint32_t state[4], const unsigned char block[64]);
  69 static void Encode(unsigned char *output, const apr_uint32_t *input,
  70                    unsigned int len);
  71 static void Decode(apr_uint32_t *output, const unsigned char *input,
  72                    unsigned int len);
  73
  74 static unsigned char PADDING[64] =
  75 {
  76     0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  77     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  78     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  79 };
  80
  81 #if APR_CHARSET_EBCDIC
  82 static apr_xlate_t *xlate_ebcdic_to_ascii; /* used in apr_md4_encode() */
  83 #endif
  84
  85 /* F, G and I are basic MD4 functions.
  86  */
  87 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
  88 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
  89 #define H(x, y, z) ((x) ^ (y) ^ (z))
  90
  91 /* ROTATE_LEFT rotates x left n bits.
  92  */
  93 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
  94
  95 /* FF, GG and HH are transformations for rounds 1, 2 and 3 */
  96 /* Rotation is separate from addition to prevent recomputation */
  97
  98 #define FF(a, b, c, d, x, s) { \
  99   (a) += F ((b), (c), (d)) + (x); \
 100   (a) = ROTATE_LEFT ((a), (s)); \
 101   }
 102 #define GG(a, b, c, d, x, s) { \
 103   (a) += G ((b), (c), (d)) + (x) + (apr_uint32_t)0x5a827999; \
 104   (a) = ROTATE_LEFT ((a), (s)); \
 105   }
 106 #define HH(a, b, c, d, x, s) { \
 107   (a) += H ((b), (c), (d)) + (x) + (apr_uint32_t)0x6ed9eba1; \
 108   (a) = ROTATE_LEFT ((a), (s)); \
 109   }
 110
 111 /* MD4 initialization. Begins an MD4 operation, writing a new context.
 112  */
 113 APU_DECLARE(apr_status_t) apr_md4_init(apr_md4_ctx_t *context)
 114 {
 115     context->count[0] = context->count[1] = 0;
 116
 117     /* Load magic initialization constants. */
 118     context->state[0] = 0x67452301;
 119     context->state[1] = 0xefcdab89;
 120     context->state[2] = 0x98badcfe;
 121     context->state[3] = 0x10325476;
 122
 123 #if APR_HAS_XLATE
 124     context->xlate = NULL;
 125 #endif
 126
 127     return APR_SUCCESS;
 128 }
 129
 130 #if APR_HAS_XLATE
 131 /* MD4 translation setup.  Provides the APR translation handle
 132  * to be used for translating the content before calculating the
 133  * digest.
 134  */
 135 APU_DECLARE(apr_status_t) apr_md4_set_xlate(apr_md4_ctx_t *context,
 136                                             apr_xlate_t *xlate)
 137 {
 138     apr_status_t rv;
 139     int is_sb;
 140
 141     /* TODO: remove the single-byte-only restriction from this code
 142      */
 143     rv = apr_xlate_sb_get(xlate, &is_sb);
 144     if (rv != APR_SUCCESS) {
 145         return rv;
 146     }
 147     if (!is_sb) {
 148         return APR_EINVAL;
 149     }
 150     context->xlate = xlate;
 151     return APR_SUCCESS;
 152 }
 153 #endif /* APR_HAS_XLATE */
 154
 155 /* MD4 block update operation. Continues an MD4 message-digest
 156  * operation, processing another message block, and updating the
 157  * context.
 158  */
 159 APU_DECLARE(apr_status_t) apr_md4_update(apr_md4_ctx_t *context,
 160                                          const unsigned char *input,
 161                                          apr_size_t inputLen)
 162 {
 163     unsigned int i, idx, partLen;
 164 #if APR_HAS_XLATE
 165     apr_size_t inbytes_left, outbytes_left;
 166 #endif
 167
 168     /* Compute number of bytes mod 64 */
 169     idx = (unsigned int)((context->count[0] >> 3) & 0x3F);
 170
 171     /* Update number of bits */
 172     if ((context->count[0] += ((apr_uint32_t)inputLen << 3))
 173             < ((apr_uint32_t)inputLen << 3))
 174         context->count[1]++;
 175     context->count[1] += (apr_uint32_t)inputLen >> 29;
 176
 177     partLen = 64 - idx;
 178
 179     /* Transform as many times as possible. */
 180 #if !APR_HAS_XLATE
 181     if (inputLen >= partLen) {
 182         memcpy(&context->buffer[idx], input, partLen);
 183         MD4Transform(context->state, context->buffer);
 184
 185         for (i = partLen; i + 63 < inputLen; i += 64)
 186             MD4Transform(context->state, &input[i]);
 187
 188         idx = 0;
 189     }
 190     else
 191         i = 0;
 192
 193     /* Buffer remaining input */
 194     memcpy(&context->buffer[idx], &input[i], inputLen - i);
 195 #else /*APR_HAS_XLATE*/
 196     if (inputLen >= partLen) {
 197         if (context->xlate) {
 198             inbytes_left = outbytes_left = partLen;
 199             apr_xlate_conv_buffer(context->xlate, (const char *)input,
 200                                   &inbytes_left,
 201                                   (char *)&context->buffer[idx],
 202                                   &outbytes_left);
 203         }
 204         else {
 205             memcpy(&context->buffer[idx], input, partLen);
 206         }
 207         MD4Transform(context->state, context->buffer);
 208
 209         for (i = partLen; i + 63 < inputLen; i += 64) {
 210             if (context->xlate) {
 211                 unsigned char inp_tmp[64];
 212                 inbytes_left = outbytes_left = 64;
 213                 apr_xlate_conv_buffer(context->xlate, (const char *)&input[i],
 214                                       &inbytes_left,
 215                                       (char *)inp_tmp, &outbytes_left);
 216                 MD4Transform(context->state, inp_tmp);
 217             }
 218             else {
 219                 MD4Transform(context->state, &input[i]);
 220             }
 221         }
 222
 223         idx = 0;
 224     }
 225     else
 226         i = 0;
 227
 228     /* Buffer remaining input */
 229     if (context->xlate) {
 230         inbytes_left = outbytes_left = inputLen - i;
 231         apr_xlate_conv_buffer(context->xlate, (const char *)&input[i],
 232                               &inbytes_left, (char *)&context->buffer[idx],
 233                               &outbytes_left);
 234     }
 235     else {
 236         memcpy(&context->buffer[idx], &input[i], inputLen - i);
 237     }
 238 #endif /*APR_HAS_XLATE*/
 239     return APR_SUCCESS;
 240 }
 241
 242 /* MD4 finalization. Ends an MD4 message-digest operation, writing the
 243  * the message digest and zeroizing the context.
 244  */
 245 APU_DECLARE(apr_status_t) apr_md4_final(
 246                                     unsigned char digest[APR_MD4_DIGESTSIZE],
 247                                     apr_md4_ctx_t *context)
 248 {
 249     unsigned char bits[8];
 250     unsigned int idx, padLen;
 251
 252     /* Save number of bits */
 253     Encode(bits, context->count, 8);
 254
 255 #if APR_HAS_XLATE
 256     /* apr_md4_update() should not translate for this final round. */
 257     context->xlate = NULL;
 258 #endif /*APR_HAS_XLATE*/
 259
 260     /* Pad out to 56 mod 64. */
 261     idx = (unsigned int) ((context->count[0] >> 3) & 0x3f);
 262     padLen = (idx < 56) ? (56 - idx) : (120 - idx);
 263     apr_md4_update(context, PADDING, padLen);
 264
 265     /* Append length (before padding) */
 266     apr_md4_update(context, bits, 8);
 267
 268     /* Store state in digest */
 269     Encode(digest, context->state, APR_MD4_DIGESTSIZE);
 270
 271     /* Zeroize sensitive information. */
 272     memset(context, 0, sizeof(*context));
 273
 274     return APR_SUCCESS;
 275 }
 276
 277 /* MD4 computation in one step (init, update, final)
 278  */
 279 APU_DECLARE(apr_status_t) apr_md4(unsigned char digest[APR_MD4_DIGESTSIZE],
 280                                   const unsigned char *input,
 281                                   apr_size_t inputLen)
 282 {
 283     apr_md4_ctx_t ctx;
 284     apr_status_t rv;
 285
 286     apr_md4_init(&ctx);
 287
 288     if ((rv = apr_md4_update(&ctx, input, inputLen)) != APR_SUCCESS)
 289         return rv;
 290
 291     return apr_md4_final(digest, &ctx);
 292 }
 293
 294 /* MD4 basic transformation. Transforms state based on block. */
 295 static void MD4Transform(apr_uint32_t state[4], const unsigned char block[64])
 296 {
 297     apr_uint32_t a = state[0], b = state[1], c = state[2], d = state[3],
 298                  x[APR_MD4_DIGESTSIZE];
 299
 300     Decode(x, block, 64);
 301
 302     /* Round 1 */
 303     FF (a, b, c, d, x[ 0], S11); /* 1 */
 304     FF (d, a, b, c, x[ 1], S12); /* 2 */
 305     FF (c, d, a, b, x[ 2], S13); /* 3 */
 306     FF (b, c, d, a, x[ 3], S14); /* 4 */
 307     FF (a, b, c, d, x[ 4], S11); /* 5 */
 308     FF (d, a, b, c, x[ 5], S12); /* 6 */
 309     FF (c, d, a, b, x[ 6], S13); /* 7 */
 310     FF (b, c, d, a, x[ 7], S14); /* 8 */
 311     FF (a, b, c, d, x[ 8], S11); /* 9 */
 312     FF (d, a, b, c, x[ 9], S12); /* 10 */
 313     FF (c, d, a, b, x[10], S13); /* 11 */
 314     FF (b, c, d, a, x[11], S14); /* 12 */
 315     FF (a, b, c, d, x[12], S11); /* 13 */
 316     FF (d, a, b, c, x[13], S12); /* 14 */
 317     FF (c, d, a, b, x[14], S13); /* 15 */
 318     FF (b, c, d, a, x[15], S14); /* 16 */
 319
 320     /* Round 2 */
 321     GG (a, b, c, d, x[ 0], S21); /* 17 */
 322     GG (d, a, b, c, x[ 4], S22); /* 18 */
 323     GG (c, d, a, b, x[ 8], S23); /* 19 */
 324     GG (b, c, d, a, x[12], S24); /* 20 */
 325     GG (a, b, c, d, x[ 1], S21); /* 21 */
 326     GG (d, a, b, c, x[ 5], S22); /* 22 */
 327     GG (c, d, a, b, x[ 9], S23); /* 23 */
 328     GG (b, c, d, a, x[13], S24); /* 24 */
 329     GG (a, b, c, d, x[ 2], S21); /* 25 */
 330     GG (d, a, b, c, x[ 6], S22); /* 26 */
 331     GG (c, d, a, b, x[10], S23); /* 27 */
 332     GG (b, c, d, a, x[14], S24); /* 28 */
 333     GG (a, b, c, d, x[ 3], S21); /* 29 */
 334     GG (d, a, b, c, x[ 7], S22); /* 30 */
 335     GG (c, d, a, b, x[11], S23); /* 31 */
 336     GG (b, c, d, a, x[15], S24); /* 32 */
 337
 338     /* Round 3 */
 339     HH (a, b, c, d, x[ 0], S31); /* 33 */
 340     HH (d, a, b, c, x[ 8], S32); /* 34 */
 341     HH (c, d, a, b, x[ 4], S33); /* 35 */
 342     HH (b, c, d, a, x[12], S34); /* 36 */
 343     HH (a, b, c, d, x[ 2], S31); /* 37 */
 344     HH (d, a, b, c, x[10], S32); /* 38 */
 345     HH (c, d, a, b, x[ 6], S33); /* 39 */
 346     HH (b, c, d, a, x[14], S34); /* 40 */
 347     HH (a, b, c, d, x[ 1], S31); /* 41 */
 348     HH (d, a, b, c, x[ 9], S32); /* 42 */
 349     HH (c, d, a, b, x[ 5], S33); /* 43 */
 350     HH (b, c, d, a, x[13], S34); /* 44 */
 351     HH (a, b, c, d, x[ 3], S31); /* 45 */
 352     HH (d, a, b, c, x[11], S32); /* 46 */
 353     HH (c, d, a, b, x[ 7], S33); /* 47 */
 354     HH (b, c, d, a, x[15], S34); /* 48 */
 355
 356     state[0] += a;
 357     state[1] += b;
 358     state[2] += c;
 359     state[3] += d;
 360
 361     /* Zeroize sensitive information. */
 362     memset(x, 0, sizeof(x));
 363 }
 364
 365 /* Encodes input (apr_uint32_t) into output (unsigned char). Assumes len is
 366  * a multiple of 4.
 367  */
 368 static void Encode(unsigned char *output, const apr_uint32_t *input,
 369                    unsigned int len)
 370 {
 371     unsigned int i, j;
 372     apr_uint32_t k;
 373
 374     for (i = 0, j = 0; j < len; i++, j += 4) {
 375         k = input[i];
 376         output[j]     = (unsigned char)(k & 0xff);
 377         output[j + 1] = (unsigned char)((k >> 8)  & 0xff);
 378         output[j + 2] = (unsigned char)((k >> 16) & 0xff);
 379         output[j + 3] = (unsigned char)((k >> 24) & 0xff);
 380     }
 381 }
 382
 383 /* Decodes input (unsigned char) into output (apr_uint32_t). Assumes len is
 384  * a multiple of 4.
 385  */
 386 static void Decode(apr_uint32_t *output, const unsigned char *input,
 387                    unsigned int len)
 388 {
 389     unsigned int i, j;
 390
 391     for (i = 0, j = 0; j < len; i++, j += 4)
 392         output[i] = ((apr_uint32_t)input[j])             |
 393                     (((apr_uint32_t)input[j + 1]) << 8)  |
 394                     (((apr_uint32_t)input[j + 2]) << 16) |
 395                     (((apr_uint32_t)input[j + 3]) << 24);
 396 }
 397
 398 #if APR_CHARSET_EBCDIC
 399 APU_DECLARE(apr_status_t) apr_MD4InitEBCDIC(apr_xlate_t *xlate)
 400 {
 401     xlate_ebcdic_to_ascii = xlate;
 402     return APR_SUCCESS;
 403 }
 404 #endif