/* ********************************************************************** ** md5.c ** ** RSA Data Security, Inc. MD5 Message Digest Algorithm ** ** Created: 2/17/90 RLR ** ** Revised: 1/91 SRD,AJ,BSK,JT Reference C Version ** ********************************************************************** */ /* ********************************************************************** ** Copyright (C) 1990, RSA Data Security, Inc. 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 the following line if the md5.h header file is separate -- */ #include "md5.h" #include /* sprintf */ /* forward declaration */ static void Transform (); static unsigned char PADDING[64] = { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; /* F, G and H are basic MD5 functions: selection, majority, parity */ #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); \ } void MD5Init (mdContext) MD5_CTX *mdContext; { mdContext->i[0] = mdContext->i[1] = (UINT4)0; /* Load magic initialization constants. */ mdContext->buf[0] = (UINT4)0x67452301; mdContext->buf[1] = (UINT4)0xefcdab89; mdContext->buf[2] = (UINT4)0x98badcfe; mdContext->buf[3] = (UINT4)0x10325476; } void MD5Update (mdContext, inBuf, inLen) MD5_CTX *mdContext; unsigned char *inBuf; unsigned int inLen; { UINT4 in[16]; int mdi; unsigned int i, ii; /* compute number of bytes mod 64 */ mdi = (int)((mdContext->i[0] >> 3) & 0x3F); /* update number of bits */ if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0]) mdContext->i[1]++; mdContext->i[0] += ((UINT4)inLen << 3); mdContext->i[1] += ((UINT4)inLen >> 29); while (inLen--) { /* add new character to buffer, increment mdi */ mdContext->in[mdi++] = *inBuf++; /* transform if necessary */ if (mdi == 0x40) { for (i = 0, ii = 0; i < 16; i++, ii += 4) in[i] = (((UINT4)mdContext->in[ii+3]) << 24) | (((UINT4)mdContext->in[ii+2]) << 16) | (((UINT4)mdContext->in[ii+1]) << 8) | ((UINT4)mdContext->in[ii]); Transform (mdContext->buf, in); mdi = 0; } } } void MD5Final (mdContext) MD5_CTX *mdContext; { UINT4 in[16]; int mdi; unsigned int i, ii; unsigned int padLen; /* save number of bits */ in[14] = mdContext->i[0]; in[15] = mdContext->i[1]; /* compute number of bytes mod 64 */ mdi = (int)((mdContext->i[0] >> 3) & 0x3F); /* pad out to 56 mod 64 */ padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi); MD5Update (mdContext, PADDING, padLen); /* append length in bits and transform */ for (i = 0, ii = 0; i < 14; i++, ii += 4) in[i] = (((UINT4)mdContext->in[ii+3]) << 24) | (((UINT4)mdContext->in[ii+2]) << 16) | (((UINT4)mdContext->in[ii+1]) << 8) | ((UINT4)mdContext->in[ii]); Transform (mdContext->buf, in); /* store buffer in digest */ for (i = 0, ii = 0; i < 4; i++, ii += 4) { mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF); mdContext->digest[ii+1] = (unsigned char)((mdContext->buf[i] >> 8) & 0xFF); mdContext->digest[ii+2] = (unsigned char)((mdContext->buf[i] >> 16) & 0xFF); mdContext->digest[ii+3] = (unsigned char)((mdContext->buf[i] >> 24) & 0xFF); } /* added: generate hex-string */ for (i = 0; i < 16; i++) sprintf(&mdContext->string[i * 2], "%02x", mdContext->digest[i]); mdContext->string[32] = '\0'; } /* Basic MD5 step. Transform buf based on in. */ static void Transform (buf, in) UINT4 *buf; UINT4 *in; { UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3]; /* Round 1 */ #define S11 7 #define S12 12 #define S13 17 #define S14 22 FF ( a, b, c, d, in[ 0], S11, 3614090360); /* 1 */ FF ( d, a, b, c, in[ 1], S12, 3905402710); /* 2 */ FF ( c, d, a, b, in[ 2], S13, 606105819); /* 3 */ FF ( b, c, d, a, in[ 3], S14, 3250441966); /* 4 */ FF ( a, b, c, d, in[ 4], S11, 4118548399); /* 5 */ FF ( d, a, b, c, in[ 5], S12, 1200080426); /* 6 */ FF ( c, d, a, b, in[ 6], S13, 2821735955); /* 7 */ FF ( b, c, d, a, in[ 7], S14, 4249261313); /* 8 */ FF ( a, b, c, d, in[ 8], S11, 1770035416); /* 9 */ FF ( d, a, b, c, in[ 9], S12, 2336552879); /* 10 */ FF ( c, d, a, b, in[10], S13, 4294925233); /* 11 */ FF ( b, c, d, a, in[11], S14, 2304563134); /* 12 */ FF ( a, b, c, d, in[12], S11, 1804603682); /* 13 */ FF ( d, a, b, c, in[13], S12, 4254626195); /* 14 */ FF ( c, d, a, b, in[14], S13, 2792965006); /* 15 */ FF ( b, c, d, a, in[15], S14, 1236535329); /* 16 */ /* Round 2 */ #define S21 5 #define S22 9 #define S23 14 #define S24 20 GG ( a, b, c, d, in[ 1], S21, 4129170786); /* 17 */ GG ( d, a, b, c, in[ 6], S22, 3225465664); /* 18 */ GG ( c, d, a, b, in[11], S23, 643717713); /* 19 */ GG ( b, c, d, a, in[ 0], S24, 3921069994); /* 20 */ GG ( a, b, c, d, in[ 5], S21, 3593408605); /* 21 */ GG ( d, a, b, c, in[10], S22, 38016083); /* 22 */ GG ( c, d, a, b, in[15], S23, 3634488961); /* 23 */ GG ( b, c, d, a, in[ 4], S24, 3889429448); /* 24 */ GG ( a, b, c, d, in[ 9], S21, 568446438); /* 25 */ GG ( d, a, b, c, in[14], S22, 3275163606); /* 26 */ GG ( c, d, a, b, in[ 3], S23, 4107603335); /* 27 */ GG ( b, c, d, a, in[ 8], S24, 1163531501); /* 28 */ GG ( a, b, c, d, in[13], S21, 2850285829); /* 29 */ GG ( d, a, b, c, in[ 2], S22, 4243563512); /* 30 */ GG ( c, d, a, b, in[ 7], S23, 1735328473); /* 31 */ GG ( b, c, d, a, in[12], S24, 2368359562); /* 32 */ /* Round 3 */ #define S31 4 #define S32 11 #define S33 16 #define S34 23 HH ( a, b, c, d, in[ 5], S31, 4294588738); /* 33 */ HH ( d, a, b, c, in[ 8], S32, 2272392833); /* 34 */ HH ( c, d, a, b, in[11], S33, 1839030562); /* 35 */ HH ( b, c, d, a, in[14], S34, 4259657740); /* 36 */ HH ( a, b, c, d, in[ 1], S31, 2763975236); /* 37 */ HH ( d, a, b, c, in[ 4], S32, 1272893353); /* 38 */ HH ( c, d, a, b, in[ 7], S33, 4139469664); /* 39 */ HH ( b, c, d, a, in[10], S34, 3200236656); /* 40 */ HH ( a, b, c, d, in[13], S31, 681279174); /* 41 */ HH ( d, a, b, c, in[ 0], S32, 3936430074); /* 42 */ HH ( c, d, a, b, in[ 3], S33, 3572445317); /* 43 */ HH ( b, c, d, a, in[ 6], S34, 76029189); /* 44 */ HH ( a, b, c, d, in[ 9], S31, 3654602809); /* 45 */ HH ( d, a, b, c, in[12], S32, 3873151461); /* 46 */ HH ( c, d, a, b, in[15], S33, 530742520); /* 47 */ HH ( b, c, d, a, in[ 2], S34, 3299628645); /* 48 */ /* Round 4 */ #define S41 6 #define S42 10 #define S43 15 #define S44 21 II ( a, b, c, d, in[ 0], S41, 4096336452); /* 49 */ II ( d, a, b, c, in[ 7], S42, 1126891415); /* 50 */ II ( c, d, a, b, in[14], S43, 2878612391); /* 51 */ II ( b, c, d, a, in[ 5], S44, 4237533241); /* 52 */ II ( a, b, c, d, in[12], S41, 1700485571); /* 53 */ II ( d, a, b, c, in[ 3], S42, 2399980690); /* 54 */ II ( c, d, a, b, in[10], S43, 4293915773); /* 55 */ II ( b, c, d, a, in[ 1], S44, 2240044497); /* 56 */ II ( a, b, c, d, in[ 8], S41, 1873313359); /* 57 */ II ( d, a, b, c, in[15], S42, 4264355552); /* 58 */ II ( c, d, a, b, in[ 6], S43, 2734768916); /* 59 */ II ( b, c, d, a, in[13], S44, 1309151649); /* 60 */ II ( a, b, c, d, in[ 4], S41, 4149444226); /* 61 */ II ( d, a, b, c, in[11], S42, 3174756917); /* 62 */ II ( c, d, a, b, in[ 2], S43, 718787259); /* 63 */ II ( b, c, d, a, in[ 9], S44, 3951481745); /* 64 */ buf[0] += a; buf[1] += b; buf[2] += c; buf[3] += d; } /* ********************************************************************** ** End of md5.c ** ******************************* (cut) ******************************** */