LCOV - code coverage report
Current view: top level - common/utils - md5.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 111 113 98.2 %
Date: 2021-10-27 03:06:47 Functions: 6 6 100.0 %

          Line data    Source code
       1             : /* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
       2             :  */
       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             : 
      26             : #include "md5.h"
      27             : #include <string.h>
      28             : 
      29             : /* Constants for MD5Transform routine.
      30             :  */
      31             : 
      32             : #define S11 7
      33             : #define S12 12
      34             : #define S13 17
      35             : #define S14 22
      36             : #define S21 5
      37             : #define S22 9
      38             : #define S23 14
      39             : #define S24 20
      40             : #define S31 4
      41             : #define S32 11
      42             : #define S33 16
      43             : #define S34 23
      44             : #define S41 6
      45             : #define S42 10
      46             : #define S43 15
      47             : #define S44 21
      48             : 
      49             : static void MD5Transform(uint32_t [4], const uint8_t [64]);
      50             : static void Encode(uint8_t *, const uint32_t *, unsigned int);
      51             : static void Decode(uint32_t *, const uint8_t *, unsigned int);
      52             : 
      53             : static uint8_t PADDING[64] = {
      54             :         0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      55             :         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      56             :         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
      57             : };
      58             : 
      59             : /* F, G, H and I are basic MD5 functions.
      60             :  */
      61             : #define F(x, y, z)(((x) & (y)) | ((~x) & (z)))
      62             : #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
      63             : #define H(x, y, z) ((x) ^ (y) ^ (z))
      64             : #define I(x, y, z) ((y) ^ ((x) | (~z)))
      65             : 
      66             : /* ROTATE_LEFT rotates x left n bits.
      67             :  */
      68             : #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
      69             : 
      70             : /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
      71             :    Rotation is separate from addition to prevent recomputation.
      72             : */
      73             : #define FF(a, b, c, d, x, s, ac) {                                      \
      74             :                 (a) += F((b), (c), (d)) + (x) + (uint32_t)(ac); \
      75             :                 (a) = ROTATE_LEFT((a), (s));                            \
      76             :                 (a) += (b);                                             \
      77             :         }
      78             : #define GG(a, b, c, d, x, s, ac) {                                      \
      79             :                 (a) += G((b), (c), (d)) + (x) + (uint32_t)(ac); \
      80             :                 (a) = ROTATE_LEFT((a), (s));                            \
      81             :                 (a) += (b);                                             \
      82             :         }
      83             : #define HH(a, b, c, d, x, s, ac) {                                      \
      84             :                 (a) += H((b), (c), (d)) + (x) + (uint32_t)(ac); \
      85             :                 (a) = ROTATE_LEFT((a), (s));                            \
      86             :                 (a) += (b);                                             \
      87             :         }
      88             : #define II(a, b, c, d, x, s, ac) {                                      \
      89             :                 (a) += I((b), (c), (d)) + (x) + (uint32_t)(ac); \
      90             :                 (a) = ROTATE_LEFT((a), (s));                            \
      91             :                 (a) += (b);                                             \
      92             :         }
      93             : 
      94             : /* MD5 initialization. Begins an MD5 operation, writing a new context.
      95             :  */
      96          12 : void MD5Init(MD5_CTX *context)
      97             : {
      98          12 :         context->count[0] = context->count[1] = 0;
      99             :         /* Load magic initialization constants.
     100             :          */
     101          12 :         context->state[0] = 0x67452301;
     102          12 :         context->state[1] = 0xefcdab89;
     103          12 :         context->state[2] = 0x98badcfe;
     104          12 :         context->state[3] = 0x10325476;
     105          12 : }
     106             : 
     107             : /* MD5 block update operation. Continues an MD5 message-digest
     108             :    operation, processing another message block, and updating the
     109             :    context.
     110             : */
     111          36 : void MD5Update(
     112             :         MD5_CTX *context,                                        /* context */
     113             :         const uint8_t *input,                                /* input block */
     114             :         unsigned int inputLen)                     /* length of input block */
     115             : {
     116             :         unsigned int i, index, partLen;
     117             : 
     118             :         /* Compute number of bytes mod 64 */
     119          36 :         index = (unsigned int)((context->count[0] >> 3) & 0x3F);
     120             : 
     121             :         /* Update number of bits */
     122          36 :         if ((context->count[0] += ((uint32_t)inputLen << 3))
     123             :             < ((uint32_t)inputLen << 3))
     124           0 :                 context->count[1]++;
     125          36 :         context->count[1] += ((uint32_t)inputLen >> 29);
     126             : 
     127          36 :         partLen = 64 - index;
     128             : 
     129             :         /* Transform as many times as possible.
     130             :          */
     131          36 :         if (inputLen >= partLen) {
     132          14 :                 memcpy(&context->buffer[index], input, partLen);
     133          14 :                 MD5Transform(context->state, context->buffer);
     134             : 
     135          14 :                 for (i = partLen; i + 63 < inputLen; i += 64)
     136           0 :                         MD5Transform(context->state, &input[i]);
     137             : 
     138             :                 index = 0;
     139             :         }
     140             :         else
     141             :                 i = 0;
     142             : 
     143             :         /* Buffer remaining input */
     144          36 :         memcpy(&context->buffer[index], &input[i], inputLen-i);
     145          36 : }
     146             : 
     147             : /* MD5 finalization. Ends an MD5 message-digest operation, writing the
     148             :    the message digest and zeroizing the context.
     149             : */
     150          12 : void MD5Final(
     151             :         uint8_t digest[16],                         /* message digest */
     152             :         MD5_CTX *context)                                       /* context */
     153             : {
     154             :         uint8_t bits[8];
     155             :         unsigned int index, padLen;
     156             : 
     157             :         /* Save number of bits */
     158          12 :         Encode(bits, context->count, 8);
     159             : 
     160             :         /* Pad out to 56 mod 64.
     161             :          */
     162          12 :         index = (unsigned int)((context->count[0] >> 3) & 0x3f);
     163          12 :         padLen = (index < 56) ? (56 - index) : (120 - index);
     164          12 :         MD5Update(context, PADDING, padLen);
     165             : 
     166             :         /* Append length (before padding) */
     167          12 :         MD5Update(context, bits, 8);
     168             :         /* Store state in digest */
     169          12 :         Encode(digest, context->state, 16);
     170             : 
     171             :         /* Zeroize sensitive information.
     172             :          */
     173          12 :         memset(context, 0, sizeof(*context));
     174          12 : }
     175             : 
     176             : /* MD5 basic transformation. Transforms state based on block.
     177             :  */
     178          14 : static void MD5Transform(uint32_t state[4], const uint8_t block[64])
     179             : {
     180          14 :         uint32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
     181             : 
     182          14 :         Decode(x, block, 64);
     183             : 
     184             :         /* Round 1 */
     185          14 :         FF(a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
     186          14 :         FF(d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
     187          14 :         FF(c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
     188          14 :         FF(b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
     189          14 :         FF(a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
     190          14 :         FF(d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
     191          14 :         FF(c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
     192          14 :         FF(b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
     193          14 :         FF(a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
     194          14 :         FF(d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
     195          14 :         FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
     196          14 :         FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
     197          14 :         FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
     198          14 :         FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
     199          14 :         FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
     200          14 :         FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
     201             : 
     202             :         /* Round 2 */
     203          14 :         GG(a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
     204          14 :         GG(d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
     205          14 :         GG(c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
     206          14 :         GG(b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
     207          14 :         GG(a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
     208          14 :         GG(d, a, b, c, x[10], S22,  0x2441453); /* 22 */
     209          14 :         GG(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
     210          14 :         GG(b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
     211          14 :         GG(a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
     212          14 :         GG(d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
     213          14 :         GG(c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
     214          14 :         GG(b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
     215          14 :         GG(a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
     216          14 :         GG(d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
     217          14 :         GG(c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
     218          14 :         GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
     219             : 
     220             :         /* Round 3 */
     221          14 :         HH(a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
     222          14 :         HH(d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
     223          14 :         HH(c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
     224          14 :         HH(b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
     225          14 :         HH(a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
     226          14 :         HH(d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
     227          14 :         HH(c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
     228          14 :         HH(b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
     229          14 :         HH(a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
     230          14 :         HH(d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
     231          14 :         HH(c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
     232          14 :         HH(b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
     233          14 :         HH(a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
     234          14 :         HH(d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
     235          14 :         HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
     236          14 :         HH(b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
     237             : 
     238             :         /* Round 4 */
     239          14 :         II(a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
     240          14 :         II(d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
     241          14 :         II(c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
     242          14 :         II(b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
     243          14 :         II(a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
     244          14 :         II(d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
     245          14 :         II(c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
     246          14 :         II(b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
     247          14 :         II(a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
     248          14 :         II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
     249          14 :         II(c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
     250          14 :         II(b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
     251          14 :         II(a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
     252          14 :         II(d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
     253          14 :         II(c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
     254          14 :         II(b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
     255             : 
     256          14 :         state[0] += a;
     257          14 :         state[1] += b;
     258          14 :         state[2] += c;
     259          14 :         state[3] += d;
     260             : 
     261             :         /* Zeroize sensitive information.
     262             :          */
     263             :         memset(x, 0, sizeof(x));
     264          14 : }
     265             : 
     266             : /* Encodes input (uint32_t) into output (uint8_t). Assumes len is
     267             :    a multiple of 4.
     268             : */
     269          24 : static void Encode(uint8_t *output, const uint32_t *input, unsigned int len)
     270             : {
     271             :         unsigned int i, j;
     272             : 
     273          96 :         for (i = 0, j = 0; j < len; i++, j += 4) {
     274          72 :                 output[j] = (uint8_t)(input[i] & 0xff);
     275          72 :                 output[j+1] = (uint8_t)((input[i] >> 8) & 0xff);
     276          72 :                 output[j+2] = (uint8_t)((input[i] >> 16) & 0xff);
     277          72 :                 output[j+3] = (uint8_t)((input[i] >> 24) & 0xff);
     278             :         }
     279          24 : }
     280             : 
     281             : /* Decodes input (uint8_t) into output (uint32_t). Assumes len is
     282             :    a multiple of 4.
     283             : */
     284          14 : static void Decode(uint32_t *output, const uint8_t *input, unsigned int len)
     285             : {
     286             :         unsigned int i, j;
     287             : 
     288         238 :         for (i = 0, j = 0; j < len; i++, j += 4)
     289         224 :                 output[i] = ((uint32_t)input[j]) | (((uint32_t)input[j+1]) << 8) |
     290         224 :                         (((uint32_t)input[j+2]) << 16) | (((uint32_t)input[j+3]) << 24);
     291          14 : }

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