FreeBSD/Linux Kernel Cross Reference
sys/lib/libkern/md5c.c

     /*      $NetBSD: md5c.c,v 1.10 2003/12/04 12:42:54 keihan Exp $ */
     
     /*
      * This file is derived from the RSA Data Security, Inc. MD5 Message-Digest
      * Algorithm and has been modifed by Jason R. Thorpe <thorpej@NetBSD.org>
      * for portability and formatting.
      */
     
     /*
     * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
     * rights reserved.
     *
     * License to copy and use this software is granted provided that it
     * is identified as the "RSA Data Security, Inc. MD5 Message-Digest
     * Algorithm" in all material mentioning or referencing this software
     * or this function.
     *
     * License is also granted to make and use derivative works provided
     * that such works are identified as "derived from the RSA Data
     * Security, Inc. MD5 Message-Digest Algorithm" in all material
     * mentioning or referencing the derived work.
     *
     * RSA Data Security, Inc. makes no representations concerning either
     * the merchantability of this software or the suitability of this
     * software for any particular purpose. It is provided "as is"
     * without express or implied warranty of any kind.
     *
     * These notices must be retained in any copies of any part of this
     * documentation and/or software.
     */
    
    #include <sys/param.h>
    #if defined(_KERNEL) || defined(_STANDALONE)
    #include <sys/md5.h>
    #include <lib/libkern/libkern.h>
    #else
    #include "namespace.h"
    #include <string.h>
    #include <md5.h>
    #endif /* _KERNEL || _STANDALONE */
    
    #define ZEROIZE(d, l)           memset((d), 0, (l))
    
    typedef unsigned char *POINTER;
    typedef u_int16_t UINT2;
    typedef u_int32_t UINT4;
    
    /*
     * Constants for MD5Transform routine.
     */
    #define S11 7
    #define S12 12
    #define S13 17
    #define S14 22
    #define S21 5
    #define S22 9
    #define S23 14
    #define S24 20
    #define S31 4
    #define S32 11
    #define S33 16
    #define S34 23
    #define S41 6
    #define S42 10
    #define S43 15
    #define S44 21
    
    #if !defined(_KERNEL) && !defined(_STANDALONE) && defined(__weak_alias)
    __weak_alias(MD5Init,_MD5Init);
    __weak_alias(MD5Update,_MD5Update);
    __weak_alias(MD5Final,_MD5Final);
    #endif
    
    static void MD5Transform __P((UINT4 [4], const unsigned char [64]));
    
    static void Encode __P((unsigned char *, UINT4 *, unsigned int));
    static void Decode __P((UINT4 *, const unsigned char *, unsigned int));
    
    /*
     * Encodes input (UINT4) into output (unsigned char).  Assumes len is
     * a multiple of 4.
     */
    static void
    Encode (output, input, len)
            unsigned char *output;
            UINT4 *input;
            unsigned int len;
    {
            unsigned int i, j;
    
            for (i = 0, j = 0; j < len; i++, j += 4) {
                    output[j] = (unsigned char)(input[i] & 0xff);
                    output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
                    output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
                    output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
            }
    }
    
    /*
    * Decodes input (unsigned char) into output (UINT4).  Assumes len is
    * a multiple of 4.
    */
   static void
   Decode (output, input, len)
           UINT4 *output;
           const unsigned char *input;
           unsigned int len;
   {
           unsigned int i, j;
   
           for (i = 0, j = 0; j < len; i++, j += 4)
                   output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
                       (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
   }
   
   static const unsigned char PADDING[64] = {
           0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
           0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
           0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
   };
   
   /*
    * F, G, H and I are basic MD5 functions.
    */
   #define F(x, y, z)      (((x) & (y)) | ((~x) & (z)))
   #define G(x, y, z)      (((x) & (z)) | ((y) & (~z)))
   #define H(x, y, z)      ((x) ^ (y) ^ (z))
   #define I(x, y, z)      ((y) ^ ((x) | (~z)))
   
   /*
    * ROTATE_LEFT rotates x left n bits.
    */
   #define ROTATE_LEFT(x, n)       (((x) << (n)) | ((x) >> (32-(n))))
   
   /*
    * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
    * Rotation is separate from addition to prevent recomputation.
    */
   #define FF(a, b, c, d, x, s, ac) { \
           (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
           (a) = ROTATE_LEFT ((a), (s)); \
           (a) += (b); \
   }
   
   #define GG(a, b, c, d, x, s, ac) { \
           (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
           (a) = ROTATE_LEFT ((a), (s)); \
           (a) += (b); \
   }
   
   #define HH(a, b, c, d, x, s, ac) { \
           (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
           (a) = ROTATE_LEFT ((a), (s)); \
           (a) += (b); \
   }
   
   #define II(a, b, c, d, x, s, ac) { \
           (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
           (a) = ROTATE_LEFT ((a), (s)); \
           (a) += (b); \
   }
   
   /*
    * MD5 initialization. Begins an MD5 operation, writing a new context.
    */
   void
   MD5Init(context)
           MD5_CTX *context;               /* context */
   {
   
           context->count[0] = context->count[1] = 0;
   
           /* Load magic initialization constants. */
           context->state[0] = 0x67452301;
           context->state[1] = 0xefcdab89;
           context->state[2] = 0x98badcfe;
           context->state[3] = 0x10325476;
   }
   
   /*
    * MD5 block update operation.  Continues an MD5 message-digest
    * operation, processing another message block, and updating the
    * context.
    */
   void
   MD5Update(context, input, inputLen)
           MD5_CTX *context;               /* context */
           const unsigned char *input;     /* input block */
           unsigned int inputLen;          /* length of input block */
   {
           unsigned int i, idx, partLen;
   
           /* Compute number of bytes mod 64 */
           idx = (unsigned int)((context->count[0] >> 3) & 0x3F);
   
           /* Update number of bits */
           if ((context->count[0] += ((UINT4)inputLen << 3))
               < ((UINT4)inputLen << 3))
                   context->count[1]++;
           context->count[1] += ((UINT4)inputLen >> 29);
   
           partLen = 64 - idx;
   
           /* Transform as many times as possible. */
           if (inputLen >= partLen) {
                   /* LINTED const castaway ok */
                   memcpy((POINTER)&context->buffer[idx],
                       (POINTER)input, partLen);
                   MD5Transform(context->state, context->buffer);
   
                   for (i = partLen; i + 63 < inputLen; i += 64)
                           MD5Transform(context->state, &input[i]);
   
                   idx = 0;
           } else
                   i = 0;
   
           /* Buffer remaining input */
           /* LINTED const castaway ok */
           memcpy((POINTER)&context->buffer[idx], (POINTER)&input[i],
               inputLen - i);
   }
   
   /*
    * MD5 finalization.  Ends an MD5 message-digest operation, writing the
    * message digest and zeroing the context.
    */
   void
   MD5Final(digest, context)
           unsigned char digest[16];       /* message digest */
           MD5_CTX *context;               /* context */
   {
           unsigned char bits[8];
           unsigned int idx, padLen;
   
           /* Save number of bits */
           Encode(bits, context->count, 8);
   
           /* Pad out to 56 mod 64. */
           idx = (unsigned int)((context->count[0] >> 3) & 0x3f);
           padLen = (idx < 56) ? (56 - idx) : (120 - idx);
           MD5Update (context, PADDING, padLen);
   
           /* Append length (before padding) */
           MD5Update(context, bits, 8);
   
           /* Store state in digest */
           Encode(digest, context->state, 16);
   
           /* Zeroize sensitive information. */
           ZEROIZE((POINTER)(void *)context, sizeof(*context));
   }
   
   /*
    * MD5 basic transformation. Transforms state based on block.
    */
   static void
   MD5Transform(state, block)
           UINT4 state[4];
           const unsigned char block[64];
   {
           UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
   
           Decode(x, block, 64);
   
           /* Round 1 */
           FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
           FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
           FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
           FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
           FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
           FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
           FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
           FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
           FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
           FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
           FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
           FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
           FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
           FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
           FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
           FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
   
           /* Round 2 */
           GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
           GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
           GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
           GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
           GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
           GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
           GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
           GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
           GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
           GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
           GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
           GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
           GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
           GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
           GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
           GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
   
           /* Round 3 */
           HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
           HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
           HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
           HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
           HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
           HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
           HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
           HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
           HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
           HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
           HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
           HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
           HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
           HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
           HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
           HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
   
           /* Round 4 */
           II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
           II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
           II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
           II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
           II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
           II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
           II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
           II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
           II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
           II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
           II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
           II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
           II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
           II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
           II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
           II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
   
           state[0] += a;
           state[1] += b;
           state[2] += c;
           state[3] += d;
   
           /* Zeroize sensitive information. */
           ZEROIZE((POINTER)(void *)x, sizeof (x));
   }

Cache object: ed4ca853417bf5db29ecee29e4614e86