meillo@0: /* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
meillo@0:  */
meillo@0: 
meillo@0: /* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
meillo@0: rights reserved.
meillo@0: 
meillo@0: License to copy and use this software is granted provided that it
meillo@0: is identified as the "RSA Data Security, Inc. MD5 Message-Digest
meillo@0: Algorithm" in all material mentioning or referencing this software
meillo@0: or this function.
meillo@0: 
meillo@0: License is also granted to make and use derivative works provided
meillo@0: that such works are identified as "derived from the RSA Data
meillo@0: Security, Inc. MD5 Message-Digest Algorithm" in all material
meillo@0: mentioning or referencing the derived work.
meillo@0: 
meillo@0: RSA Data Security, Inc. makes no representations concerning either
meillo@0: the merchantability of this software or the suitability of this
meillo@0: software for any particular purpose. It is provided "as is"
meillo@0: without express or implied warranty of any kind.
meillo@0: 
meillo@0: These notices must be retained in any copies of any part of this
meillo@0: documentation and/or software.
meillo@0:  */
meillo@0: 
meillo@0: #include "global.h"
meillo@0: #include "md5.h"
meillo@0: 
meillo@0: /* Constants for MD5Transform routine.
meillo@0:  */
meillo@0: #define S11 7
meillo@0: #define S12 12
meillo@0: #define S13 17
meillo@0: #define S14 22
meillo@0: #define S21 5
meillo@0: #define S22 9
meillo@0: #define S23 14
meillo@0: #define S24 20
meillo@0: #define S31 4
meillo@0: #define S32 11
meillo@0: #define S33 16
meillo@0: #define S34 23
meillo@0: #define S41 6
meillo@0: #define S42 10
meillo@0: #define S43 15
meillo@0: #define S44 21
meillo@0: 
meillo@10: static void MD5Transform PROTO_LIST((UINT4[4], unsigned char[64]));
meillo@10: static void Encode PROTO_LIST((unsigned char *, UINT4 *, unsigned int));
meillo@10: static void Decode PROTO_LIST((UINT4 *, unsigned char *, unsigned int));
meillo@10: static void MD5_memcpy PROTO_LIST((POINTER, POINTER, unsigned int));
meillo@10: static void MD5_memset PROTO_LIST((POINTER, int, unsigned int));
meillo@0: 
meillo@0: static unsigned char PADDING[64] = {
meillo@10: 	0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
meillo@10: 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
meillo@10: 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
meillo@0: };
meillo@0: 
meillo@0: /* F, G, H and I are basic MD5 functions.
meillo@0:  */
meillo@0: #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
meillo@0: #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
meillo@0: #define H(x, y, z) ((x) ^ (y) ^ (z))
meillo@0: #define I(x, y, z) ((y) ^ ((x) | (~z)))
meillo@0: 
meillo@0: /* ROTATE_LEFT rotates x left n bits.
meillo@0:  */
meillo@0: #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
meillo@0: 
meillo@0: /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
meillo@0: Rotation is separate from addition to prevent recomputation.
meillo@0:  */
meillo@0: #define FF(a, b, c, d, x, s, ac) { \
meillo@0:  (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
meillo@0:  (a) = ROTATE_LEFT ((a), (s)); \
meillo@0:  (a) += (b); \
meillo@0:   }
meillo@0: #define GG(a, b, c, d, x, s, ac) { \
meillo@0:  (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
meillo@0:  (a) = ROTATE_LEFT ((a), (s)); \
meillo@0:  (a) += (b); \
meillo@0:   }
meillo@0: #define HH(a, b, c, d, x, s, ac) { \
meillo@0:  (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
meillo@0:  (a) = ROTATE_LEFT ((a), (s)); \
meillo@0:  (a) += (b); \
meillo@0:   }
meillo@0: #define II(a, b, c, d, x, s, ac) { \
meillo@0:  (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
meillo@0:  (a) = ROTATE_LEFT ((a), (s)); \
meillo@0:  (a) += (b); \
meillo@0:   }
meillo@0: 
meillo@0: /* MD5 initialization. Begins an MD5 operation, writing a new context.
meillo@0:  */
meillo@10: void
meillo@10: MD5Init(context)
meillo@10: MD5_CTX *context;  /* context */
meillo@0: {
meillo@10: 	context->count[0] = context->count[1] = 0;
meillo@10: 	/* Load magic initialization constants. */
meillo@10: 	context->state[0] = 0x67452301;
meillo@10: 	context->state[1] = 0xefcdab89;
meillo@10: 	context->state[2] = 0x98badcfe;
meillo@10: 	context->state[3] = 0x10325476;
meillo@0: }
meillo@0: 
meillo@0: /* MD5 block update operation. Continues an MD5 message-digest
meillo@0:   operation, processing another message block, and updating the
meillo@0:   context.
meillo@0:  */
meillo@10: void
meillo@10: MD5Update(context, input, inputLen)
meillo@10: MD5_CTX *context;  /* context */
meillo@10: unsigned char *input;  /* input block */
meillo@10: unsigned int inputLen;  /* length of input block */
meillo@0: {
meillo@10: 	unsigned int i, index, partLen;
meillo@0: 
meillo@10: 	/* Compute number of bytes mod 64 */
meillo@10: 	index = (unsigned int) ((context->count[0] >> 3) & 0x3F);
meillo@0: 
meillo@10: 	/* Update number of bits */
meillo@10: 	if ((context->count[0] += ((UINT4) inputLen << 3)) < ((UINT4) inputLen << 3))
meillo@10: 		context->count[1]++;
meillo@10: 	context->count[1] += ((UINT4) inputLen >> 29);
meillo@0: 
meillo@10: 	partLen = 64 - index;
meillo@0: 
meillo@10: 	/* Transform as many times as possible.
meillo@10: 	 */
meillo@10: 	if (inputLen >= partLen) {
meillo@10: 		MD5_memcpy((POINTER) & context->buffer[index], (POINTER) input, partLen);
meillo@10: 		MD5Transform(context->state, context->buffer);
meillo@0: 
meillo@10: 		for (i = partLen; i + 63 < inputLen; i += 64)
meillo@10: 			MD5Transform(context->state, &input[i]);
meillo@0: 
meillo@10: 		index = 0;
meillo@10: 	} else
meillo@10: 		i = 0;
meillo@0: 
meillo@10: 	/* Buffer remaining input */
meillo@10: 	MD5_memcpy((POINTER) & context->buffer[index], (POINTER) & input[i], inputLen - i);
meillo@0: }
meillo@0: 
meillo@0: /* MD5 finalization. Ends an MD5 message-digest operation, writing the
meillo@0:   the message digest and zeroizing the context.
meillo@0:  */
meillo@10: void
meillo@10: MD5Final(digest, context)
meillo@10: unsigned char digest[16];  /* message digest */
meillo@10: MD5_CTX *context;  /* context */
meillo@0: {
meillo@10: 	unsigned char bits[8];
meillo@10: 	unsigned int index, padLen;
meillo@0: 
meillo@10: 	/* Save number of bits */
meillo@10: 	Encode(bits, context->count, 8);
meillo@0: 
meillo@10: 	/* Pad out to 56 mod 64.
meillo@10: 	 */
meillo@10: 	index = (unsigned int) ((context->count[0] >> 3) & 0x3f);
meillo@10: 	padLen = (index < 56) ? (56 - index) : (120 - index);
meillo@10: 	MD5Update(context, PADDING, padLen);
meillo@0: 
meillo@10: 	/* Append length (before padding) */
meillo@10: 	MD5Update(context, bits, 8);
meillo@0: 
meillo@10: 	/* Store state in digest */
meillo@10: 	Encode(digest, context->state, 16);
meillo@0: 
meillo@10: 	/* Zeroize sensitive information.
meillo@10: 	 */
meillo@10: 	MD5_memset((POINTER) context, 0, sizeof(*context));
meillo@0: }
meillo@0: 
meillo@0: /* MD5 basic transformation. Transforms state based on block.
meillo@0:  */
meillo@10: static void
meillo@10: MD5Transform(state, block)
meillo@0: UINT4 state[4];
meillo@0: unsigned char block[64];
meillo@0: {
meillo@10: 	UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
meillo@0: 
meillo@10: 	Decode(x, block, 64);
meillo@0: 
meillo@10: 	/* Round 1 */
meillo@10: 	FF(a, b, c, d, x[0], S11, 0xd76aa478);  /* 1 */
meillo@10: 	FF(d, a, b, c, x[1], S12, 0xe8c7b756);  /* 2 */
meillo@10: 	FF(c, d, a, b, x[2], S13, 0x242070db);  /* 3 */
meillo@10: 	FF(b, c, d, a, x[3], S14, 0xc1bdceee);  /* 4 */
meillo@10: 	FF(a, b, c, d, x[4], S11, 0xf57c0faf);  /* 5 */
meillo@10: 	FF(d, a, b, c, x[5], S12, 0x4787c62a);  /* 6 */
meillo@10: 	FF(c, d, a, b, x[6], S13, 0xa8304613);  /* 7 */
meillo@10: 	FF(b, c, d, a, x[7], S14, 0xfd469501);  /* 8 */
meillo@10: 	FF(a, b, c, d, x[8], S11, 0x698098d8);  /* 9 */
meillo@10: 	FF(d, a, b, c, x[9], S12, 0x8b44f7af);  /* 10 */
meillo@10: 	FF(c, d, a, b, x[10], S13, 0xffff5bb1);  /* 11 */
meillo@10: 	FF(b, c, d, a, x[11], S14, 0x895cd7be);  /* 12 */
meillo@10: 	FF(a, b, c, d, x[12], S11, 0x6b901122);  /* 13 */
meillo@10: 	FF(d, a, b, c, x[13], S12, 0xfd987193);  /* 14 */
meillo@10: 	FF(c, d, a, b, x[14], S13, 0xa679438e);  /* 15 */
meillo@10: 	FF(b, c, d, a, x[15], S14, 0x49b40821);  /* 16 */
meillo@0: 
meillo@10: 	/* Round 2 */
meillo@10: 	GG(a, b, c, d, x[1], S21, 0xf61e2562);  /* 17 */
meillo@10: 	GG(d, a, b, c, x[6], S22, 0xc040b340);  /* 18 */
meillo@10: 	GG(c, d, a, b, x[11], S23, 0x265e5a51);  /* 19 */
meillo@10: 	GG(b, c, d, a, x[0], S24, 0xe9b6c7aa);  /* 20 */
meillo@10: 	GG(a, b, c, d, x[5], S21, 0xd62f105d);  /* 21 */
meillo@10: 	GG(d, a, b, c, x[10], S22, 0x2441453);  /* 22 */
meillo@10: 	GG(c, d, a, b, x[15], S23, 0xd8a1e681);  /* 23 */
meillo@10: 	GG(b, c, d, a, x[4], S24, 0xe7d3fbc8);  /* 24 */
meillo@10: 	GG(a, b, c, d, x[9], S21, 0x21e1cde6);  /* 25 */
meillo@10: 	GG(d, a, b, c, x[14], S22, 0xc33707d6);  /* 26 */
meillo@10: 	GG(c, d, a, b, x[3], S23, 0xf4d50d87);  /* 27 */
meillo@10: 	GG(b, c, d, a, x[8], S24, 0x455a14ed);  /* 28 */
meillo@10: 	GG(a, b, c, d, x[13], S21, 0xa9e3e905);  /* 29 */
meillo@10: 	GG(d, a, b, c, x[2], S22, 0xfcefa3f8);  /* 30 */
meillo@10: 	GG(c, d, a, b, x[7], S23, 0x676f02d9);  /* 31 */
meillo@10: 	GG(b, c, d, a, x[12], S24, 0x8d2a4c8a);  /* 32 */
meillo@0: 
meillo@10: 	/* Round 3 */
meillo@10: 	HH(a, b, c, d, x[5], S31, 0xfffa3942);  /* 33 */
meillo@10: 	HH(d, a, b, c, x[8], S32, 0x8771f681);  /* 34 */
meillo@10: 	HH(c, d, a, b, x[11], S33, 0x6d9d6122);  /* 35 */
meillo@10: 	HH(b, c, d, a, x[14], S34, 0xfde5380c);  /* 36 */
meillo@10: 	HH(a, b, c, d, x[1], S31, 0xa4beea44);  /* 37 */
meillo@10: 	HH(d, a, b, c, x[4], S32, 0x4bdecfa9);  /* 38 */
meillo@10: 	HH(c, d, a, b, x[7], S33, 0xf6bb4b60);  /* 39 */
meillo@10: 	HH(b, c, d, a, x[10], S34, 0xbebfbc70);  /* 40 */
meillo@10: 	HH(a, b, c, d, x[13], S31, 0x289b7ec6);  /* 41 */
meillo@10: 	HH(d, a, b, c, x[0], S32, 0xeaa127fa);  /* 42 */
meillo@10: 	HH(c, d, a, b, x[3], S33, 0xd4ef3085);  /* 43 */
meillo@10: 	HH(b, c, d, a, x[6], S34, 0x4881d05);  /* 44 */
meillo@10: 	HH(a, b, c, d, x[9], S31, 0xd9d4d039);  /* 45 */
meillo@10: 	HH(d, a, b, c, x[12], S32, 0xe6db99e5);  /* 46 */
meillo@10: 	HH(c, d, a, b, x[15], S33, 0x1fa27cf8);  /* 47 */
meillo@10: 	HH(b, c, d, a, x[2], S34, 0xc4ac5665);  /* 48 */
meillo@0: 
meillo@10: 	/* Round 4 */
meillo@10: 	II(a, b, c, d, x[0], S41, 0xf4292244);  /* 49 */
meillo@10: 	II(d, a, b, c, x[7], S42, 0x432aff97);  /* 50 */
meillo@10: 	II(c, d, a, b, x[14], S43, 0xab9423a7);  /* 51 */
meillo@10: 	II(b, c, d, a, x[5], S44, 0xfc93a039);  /* 52 */
meillo@10: 	II(a, b, c, d, x[12], S41, 0x655b59c3);  /* 53 */
meillo@10: 	II(d, a, b, c, x[3], S42, 0x8f0ccc92);  /* 54 */
meillo@10: 	II(c, d, a, b, x[10], S43, 0xffeff47d);  /* 55 */
meillo@10: 	II(b, c, d, a, x[1], S44, 0x85845dd1);  /* 56 */
meillo@10: 	II(a, b, c, d, x[8], S41, 0x6fa87e4f);  /* 57 */
meillo@10: 	II(d, a, b, c, x[15], S42, 0xfe2ce6e0);  /* 58 */
meillo@10: 	II(c, d, a, b, x[6], S43, 0xa3014314);  /* 59 */
meillo@10: 	II(b, c, d, a, x[13], S44, 0x4e0811a1);  /* 60 */
meillo@10: 	II(a, b, c, d, x[4], S41, 0xf7537e82);  /* 61 */
meillo@10: 	II(d, a, b, c, x[11], S42, 0xbd3af235);  /* 62 */
meillo@10: 	II(c, d, a, b, x[2], S43, 0x2ad7d2bb);  /* 63 */
meillo@10: 	II(b, c, d, a, x[9], S44, 0xeb86d391);  /* 64 */
meillo@0: 
meillo@10: 	state[0] += a;
meillo@10: 	state[1] += b;
meillo@10: 	state[2] += c;
meillo@10: 	state[3] += d;
meillo@0: 
meillo@10: 	/* Zeroize sensitive information. */
meillo@10: 	MD5_memset((POINTER) x, 0, sizeof(x));
meillo@0: }
meillo@0: 
meillo@0: /* Encodes input (UINT4) into output (unsigned char). Assumes len is
meillo@0:   a multiple of 4.
meillo@0:  */
meillo@10: static void
meillo@10: Encode(output, input, len)
meillo@0: unsigned char *output;
meillo@0: UINT4 *input;
meillo@0: unsigned int len;
meillo@0: {
meillo@10: 	unsigned int i, j;
meillo@0: 
meillo@10: 	for (i = 0, j = 0; j < len; i++, j += 4) {
meillo@10: 		output[j] = (unsigned char) (input[i] & 0xff);
meillo@10: 		output[j + 1] = (unsigned char) ((input[i] >> 8) & 0xff);
meillo@10: 		output[j + 2] = (unsigned char) ((input[i] >> 16) & 0xff);
meillo@10: 		output[j + 3] = (unsigned char) ((input[i] >> 24) & 0xff);
meillo@10: 	}
meillo@0: }
meillo@0: 
meillo@0: /* Decodes input (unsigned char) into output (UINT4). Assumes len is
meillo@0:   a multiple of 4.
meillo@0:  */
meillo@10: static void
meillo@10: Decode(output, input, len)
meillo@0: UINT4 *output;
meillo@0: unsigned char *input;
meillo@0: unsigned int len;
meillo@0: {
meillo@10: 	unsigned int i, j;
meillo@0: 
meillo@10: 	for (i = 0, j = 0; j < len; i++, j += 4)
meillo@10: 		output[i] = ((UINT4) input[j]) | (((UINT4) input[j + 1]) << 8) | (((UINT4) input[j + 2]) << 16) | (((UINT4) input[j + 3]) << 24);
meillo@0: }
meillo@0: 
meillo@0: /* Note: Replace "for loop" with standard memcpy if possible.
meillo@0:  */
meillo@0: 
meillo@10: static void
meillo@10: MD5_memcpy(output, input, len)
meillo@0: POINTER output;
meillo@0: POINTER input;
meillo@0: unsigned int len;
meillo@0: {
meillo@10: 	unsigned int i;
meillo@0: 
meillo@10: 	for (i = 0; i < len; i++)
meillo@10: 		output[i] = input[i];
meillo@0: }
meillo@0: 
meillo@0: /* Note: Replace "for loop" with standard memset if possible.
meillo@0:  */
meillo@10: static void
meillo@10: MD5_memset(output, value, len)
meillo@0: POINTER output;
meillo@0: int value;
meillo@0: unsigned int len;
meillo@0: {
meillo@10: 	unsigned int i;
meillo@0: 
meillo@10: 	for (i = 0; i < len; i++)
meillo@10: 		((char *) output)[i] = (char) value;
meillo@0: }