The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/kern/md5c.c

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    1 /*
    2  * MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
    3  *
    4  * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
    5  * rights reserved.
    6  *
    7  * License to copy and use this software is granted provided that it
    8  * is identified as the "RSA Data Security, Inc. MD5 Message-Digest
    9  * Algorithm" in all material mentioning or referencing this software
   10  * or this function.
   11  *
   12  * License is also granted to make and use derivative works provided
   13  * that such works are identified as "derived from the RSA Data
   14  * Security, Inc. MD5 Message-Digest Algorithm" in all material
   15  * mentioning or referencing the derived work.
   16  *
   17  * RSA Data Security, Inc. makes no representations concerning either
   18  * the merchantability of this software or the suitability of this
   19  * software for any particular purpose. It is provided "as is"
   20  * without express or implied warranty of any kind.
   21  *
   22  * These notices must be retained in any copies of any part of this
   23  * documentation and/or software.
   24  *
   25  * $FreeBSD: src/sys/kern/md5c.c,v 1.15.2.1 1999/08/29 16:26:05 peter Exp $
   26  *
   27  * This code is the same as the code published by RSA Inc.  It has been
   28  * edited for clarity and style only.
   29  */
   30 
   31 #include <sys/types.h>
   32 
   33 #ifdef KERNEL
   34 #include <sys/systm.h>
   35 #else
   36 #include <string.h>
   37 #endif
   38 
   39 #include <sys/md5.h>
   40 
   41 
   42 #ifdef KERNEL
   43 #define memset(x,y,z)   bzero(x,z);
   44 #define memcpy(x,y,z)   bcopy(y, x, z)
   45 #endif
   46 
   47 #if defined(__i386__) || defined(__alpha__)
   48 #define Encode memcpy
   49 #define Decode memcpy
   50 #else /* __i386__ */
   51 
   52 /*
   53  * Encodes input (u_int32_t) into output (unsigned char). Assumes len is
   54  * a multiple of 4.
   55  */
   56 
   57 /* XXX not prototyped, and not compatible with memcpy(). */
   58 static void
   59 Encode (output, input, len)
   60         unsigned char *output;
   61         u_int32_t *input;
   62         unsigned int len;
   63 {
   64         unsigned int i, j;
   65 
   66         for (i = 0, j = 0; j < len; i++, j += 4) {
   67                 output[j] = (unsigned char)(input[i] & 0xff);
   68                 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
   69                 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
   70                 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
   71         }
   72 }
   73 
   74 /*
   75  * Decodes input (unsigned char) into output (u_int32_t). Assumes len is
   76  * a multiple of 4.
   77  */
   78 
   79 static void
   80 Decode (output, input, len)
   81         u_int32_t *output;
   82         const unsigned char *input;
   83         unsigned int len;
   84 {
   85         unsigned int i, j;
   86 
   87         for (i = 0, j = 0; j < len; i++, j += 4)
   88                 output[i] = ((u_int32_t)input[j]) | (((u_int32_t)input[j+1]) << 8) |
   89                     (((u_int32_t)input[j+2]) << 16) | (((u_int32_t)input[j+3]) << 24);
   90 }
   91 #endif /* i386 */
   92 
   93 static unsigned char PADDING[64] = {
   94   0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
   95   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
   96   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
   97 };
   98 
   99 /* F, G, H and I are basic MD5 functions. */
  100 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
  101 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
  102 #define H(x, y, z) ((x) ^ (y) ^ (z))
  103 #define I(x, y, z) ((y) ^ ((x) | (~z)))
  104 
  105 /* ROTATE_LEFT rotates x left n bits. */
  106 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
  107 
  108 /*
  109  * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
  110  * Rotation is separate from addition to prevent recomputation.
  111  */
  112 #define FF(a, b, c, d, x, s, ac) { \
  113         (a) += F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
  114         (a) = ROTATE_LEFT ((a), (s)); \
  115         (a) += (b); \
  116         }
  117 #define GG(a, b, c, d, x, s, ac) { \
  118         (a) += G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
  119         (a) = ROTATE_LEFT ((a), (s)); \
  120         (a) += (b); \
  121         }
  122 #define HH(a, b, c, d, x, s, ac) { \
  123         (a) += H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
  124         (a) = ROTATE_LEFT ((a), (s)); \
  125         (a) += (b); \
  126         }
  127 #define II(a, b, c, d, x, s, ac) { \
  128         (a) += I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
  129         (a) = ROTATE_LEFT ((a), (s)); \
  130         (a) += (b); \
  131         }
  132 
  133 /* MD5 initialization. Begins an MD5 operation, writing a new context. */
  134 
  135 void
  136 MD5Init (context)
  137         MD5_CTX *context;
  138 {
  139 
  140         context->count[0] = context->count[1] = 0;
  141 
  142         /* Load magic initialization constants.  */
  143         context->state[0] = 0x67452301;
  144         context->state[1] = 0xefcdab89;
  145         context->state[2] = 0x98badcfe;
  146         context->state[3] = 0x10325476;
  147 }
  148 
  149 /* 
  150  * MD5 block update operation. Continues an MD5 message-digest
  151  * operation, processing another message block, and updating the
  152  * context.
  153  */
  154 
  155 void
  156 MD5Update (context, input, inputLen)
  157         MD5_CTX *context;
  158         const unsigned char *input;
  159         unsigned int inputLen;
  160 {
  161         unsigned int i, index, partLen;
  162 
  163         /* Compute number of bytes mod 64 */
  164         index = (unsigned int)((context->count[0] >> 3) & 0x3F);
  165 
  166         /* Update number of bits */
  167         if ((context->count[0] += ((u_int32_t)inputLen << 3))
  168             < ((u_int32_t)inputLen << 3))
  169                 context->count[1]++;
  170         context->count[1] += ((u_int32_t)inputLen >> 29);
  171 
  172         partLen = 64 - index;
  173 
  174         /* Transform as many times as possible. */
  175         if (inputLen >= partLen) {
  176                 memcpy((void *)&context->buffer[index], (const void *)input,
  177                     partLen);
  178                 MD5Transform (context->state, context->buffer);
  179 
  180                 for (i = partLen; i + 63 < inputLen; i += 64)
  181                         MD5Transform (context->state, &input[i]);
  182 
  183                 index = 0;
  184         }
  185         else
  186                 i = 0;
  187 
  188         /* Buffer remaining input */
  189         memcpy ((void *)&context->buffer[index], (const void *)&input[i],
  190             inputLen-i);
  191 }
  192 
  193 /*
  194  * MD5 padding. Adds padding followed by original length.
  195  */
  196 
  197 void
  198 MD5Pad (context)
  199         MD5_CTX *context;
  200 {
  201         unsigned char bits[8];
  202         unsigned int index, padLen;
  203 
  204         /* Save number of bits */
  205         Encode (bits, context->count, 8);
  206 
  207         /* Pad out to 56 mod 64. */
  208         index = (unsigned int)((context->count[0] >> 3) & 0x3f);
  209         padLen = (index < 56) ? (56 - index) : (120 - index);
  210         MD5Update (context, PADDING, padLen);
  211 
  212         /* Append length (before padding) */
  213         MD5Update (context, bits, 8);
  214 }
  215 
  216 /*
  217  * MD5 finalization. Ends an MD5 message-digest operation, writing the
  218  * the message digest and zeroizing the context.
  219  */
  220 
  221 void
  222 MD5Final (digest, context)
  223         unsigned char digest[16];
  224         MD5_CTX *context;
  225 {
  226         /* Do padding. */
  227         MD5Pad (context);
  228 
  229         /* Store state in digest */
  230         Encode (digest, context->state, 16);
  231 
  232         /* Zeroize sensitive information. */
  233         memset ((void *)context, 0, sizeof (*context));
  234 }
  235 
  236 /* MD5 basic transformation. Transforms state based on block. */
  237 
  238 void
  239 MD5Transform (state, block)
  240         u_int32_t state[4];
  241         const unsigned char block[64];
  242 {
  243         u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
  244 
  245         Decode (x, block, 64);
  246 
  247         /* Round 1 */
  248 #define S11 7
  249 #define S12 12
  250 #define S13 17
  251 #define S14 22
  252         FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
  253         FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
  254         FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
  255         FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
  256         FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
  257         FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
  258         FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
  259         FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
  260         FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
  261         FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
  262         FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
  263         FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
  264         FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
  265         FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
  266         FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
  267         FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
  268 
  269         /* Round 2 */
  270 #define S21 5
  271 #define S22 9
  272 #define S23 14
  273 #define S24 20
  274         GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
  275         GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
  276         GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
  277         GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
  278         GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
  279         GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
  280         GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
  281         GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
  282         GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
  283         GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
  284         GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
  285         GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
  286         GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
  287         GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
  288         GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
  289         GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
  290 
  291         /* Round 3 */
  292 #define S31 4
  293 #define S32 11
  294 #define S33 16
  295 #define S34 23
  296         HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
  297         HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
  298         HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
  299         HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
  300         HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
  301         HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
  302         HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
  303         HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
  304         HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
  305         HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
  306         HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
  307         HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
  308         HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
  309         HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
  310         HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
  311         HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
  312 
  313         /* Round 4 */
  314 #define S41 6
  315 #define S42 10
  316 #define S43 15
  317 #define S44 21
  318         II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
  319         II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
  320         II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
  321         II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
  322         II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
  323         II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
  324         II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
  325         II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
  326         II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
  327         II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
  328         II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
  329         II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
  330         II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
  331         II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
  332         II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
  333         II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
  334 
  335         state[0] += a;
  336         state[1] += b;
  337         state[2] += c;
  338         state[3] += d;
  339 
  340         /* Zeroize sensitive information. */
  341         memset ((void *)x, 0, sizeof (x));
  342 }

Cache object: ebedb2148aed3747ceaf4eb3b8c90e02


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