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- #include "MD5.h"
- #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
- static void MD5Transform(uint32_t [4], unsigned char [64]);
- static void Encode(unsigned char *, uint32_t *, unsigned int);
- static void Decode(uint32_t *, unsigned char *, unsigned int);
- static 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
- };
- #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)))
- #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
- #define FF(a, b, c, d, x, s, ac) { \
- (a) += F ((b), (c), (d)) + (x) + (uint32_t)(ac); \
- (a) = ROTATE_LEFT ((a), (s)); \
- (a) += (b); \
- }
- #define GG(a, b, c, d, x, s, ac) { \
- (a) += G ((b), (c), (d)) + (x) + (uint32_t)(ac); \
- (a) = ROTATE_LEFT ((a), (s)); \
- (a) += (b); \
- }
- #define HH(a, b, c, d, x, s, ac) { \
- (a) += H ((b), (c), (d)) + (x) + (uint32_t)(ac); \
- (a) = ROTATE_LEFT ((a), (s)); \
- (a) += (b); \
- }
- #define II(a, b, c, d, x, s, ac) { \
- (a) += I ((b), (c), (d)) + (x) + (uint32_t)(ac); \
- (a) = ROTATE_LEFT ((a), (s)); \
- (a) += (b); \
- }
- void MD5Init(MD5_CTX *context)
- {
- context->count[0] = context->count[1] = 0;
-
- context->state[0] = 0x67452301;
- context->state[1] = 0xefcdab89;
- context->state[2] = 0x98badcfe;
- context->state[3] = 0x10325476;
- }
- void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputLen)
- {
- unsigned int i, index, partLen;
-
- index = (unsigned int)((context->count[0] >> 3) & 0x3F);
-
- if ((context->count[0] += ((uint32_t)inputLen << 3))
- < ((uint32_t)inputLen << 3))
- context->count[1]++;
- context->count[1] += ((uint32_t)inputLen >> 29);
- partLen = 64 - index;
-
- if (inputLen >= partLen)
- {
- memcpy
- ((void *)&context->buffer[index], (void *)input, partLen);
- MD5Transform(context->state, context->buffer);
- for (i = partLen; i + 63 < inputLen; i += 64)
- MD5Transform(context->state, &input[i]);
- index = 0;
- }
- else
- i = 0;
-
- memcpy
- ((void *)&context->buffer[index], (void *)&input[i],
- inputLen-i);
- }
- void MD5Final(uint8_t digest[16], MD5_CTX *context)
- {
- uint8_t bits[8] = {0};
- unsigned int index, padLen;
-
- Encode(bits, context->count, 8);
-
- index = (unsigned int)((context->count[0] >> 3) & 0x3f);
- padLen = (index < 56) ? (56 - index) : (120 - index);
- MD5Update(context, PADDING, padLen);
-
- MD5Update(context, bits, 8);
-
- Encode(digest, context->state, 16);
-
- memset((void *)context, 0, sizeof(*context));
- }
- static void MD5Transform(uint32_t state[4], uint8_t block[64])
- {
- uint32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16] = {0};
- Decode(x, block, 64);
-
- FF(a, b, c, d, x[ 0], S11, 0xd76aa478);
- FF(d, a, b, c, x[ 1], S12, 0xe8c7b756);
- FF(c, d, a, b, x[ 2], S13, 0x242070db);
- FF(b, c, d, a, x[ 3], S14, 0xc1bdceee);
- FF(a, b, c, d, x[ 4], S11, 0xf57c0faf);
- FF(d, a, b, c, x[ 5], S12, 0x4787c62a);
- FF(c, d, a, b, x[ 6], S13, 0xa8304613);
- FF(b, c, d, a, x[ 7], S14, 0xfd469501);
- FF(a, b, c, d, x[ 8], S11, 0x698098d8);
- FF(d, a, b, c, x[ 9], S12, 0x8b44f7af);
- FF(c, d, a, b, x[10], S13, 0xffff5bb1);
- FF(b, c, d, a, x[11], S14, 0x895cd7be);
- FF(a, b, c, d, x[12], S11, 0x6b901122);
- FF(d, a, b, c, x[13], S12, 0xfd987193);
- FF(c, d, a, b, x[14], S13, 0xa679438e);
- FF(b, c, d, a, x[15], S14, 0x49b40821);
-
- GG(a, b, c, d, x[ 1], S21, 0xf61e2562);
- GG(d, a, b, c, x[ 6], S22, 0xc040b340);
- GG(c, d, a, b, x[11], S23, 0x265e5a51);
- GG(b, c, d, a, x[ 0], S24, 0xe9b6c7aa);
- GG(a, b, c, d, x[ 5], S21, 0xd62f105d);
- GG(d, a, b, c, x[10], S22, 0x2441453);
- GG(c, d, a, b, x[15], S23, 0xd8a1e681);
- GG(b, c, d, a, x[ 4], S24, 0xe7d3fbc8);
- GG(a, b, c, d, x[ 9], S21, 0x21e1cde6);
- GG(d, a, b, c, x[14], S22, 0xc33707d6);
- GG(c, d, a, b, x[ 3], S23, 0xf4d50d87);
- GG(b, c, d, a, x[ 8], S24, 0x455a14ed);
- GG(a, b, c, d, x[13], S21, 0xa9e3e905);
- GG(d, a, b, c, x[ 2], S22, 0xfcefa3f8);
- GG(c, d, a, b, x[ 7], S23, 0x676f02d9);
- GG(b, c, d, a, x[12], S24, 0x8d2a4c8a);
-
- HH(a, b, c, d, x[ 5], S31, 0xfffa3942);
- HH(d, a, b, c, x[ 8], S32, 0x8771f681);
- HH(c, d, a, b, x[11], S33, 0x6d9d6122);
- HH(b, c, d, a, x[14], S34, 0xfde5380c);
- HH(a, b, c, d, x[ 1], S31, 0xa4beea44);
- HH(d, a, b, c, x[ 4], S32, 0x4bdecfa9);
- HH(c, d, a, b, x[ 7], S33, 0xf6bb4b60);
- HH(b, c, d, a, x[10], S34, 0xbebfbc70);
- HH(a, b, c, d, x[13], S31, 0x289b7ec6);
- HH(d, a, b, c, x[ 0], S32, 0xeaa127fa);
- HH(c, d, a, b, x[ 3], S33, 0xd4ef3085);
- HH(b, c, d, a, x[ 6], S34, 0x4881d05);
- HH(a, b, c, d, x[ 9], S31, 0xd9d4d039);
- HH(d, a, b, c, x[12], S32, 0xe6db99e5);
- HH(c, d, a, b, x[15], S33, 0x1fa27cf8);
- HH(b, c, d, a, x[ 2], S34, 0xc4ac5665);
-
- II(a, b, c, d, x[ 0], S41, 0xf4292244);
- II(d, a, b, c, x[ 7], S42, 0x432aff97);
- II(c, d, a, b, x[14], S43, 0xab9423a7);
- II(b, c, d, a, x[ 5], S44, 0xfc93a039);
- II(a, b, c, d, x[12], S41, 0x655b59c3);
- II(d, a, b, c, x[ 3], S42, 0x8f0ccc92);
- II(c, d, a, b, x[10], S43, 0xffeff47d);
- II(b, c, d, a, x[ 1], S44, 0x85845dd1);
- II(a, b, c, d, x[ 8], S41, 0x6fa87e4f);
- II(d, a, b, c, x[15], S42, 0xfe2ce6e0);
- II(c, d, a, b, x[ 6], S43, 0xa3014314);
- II(b, c, d, a, x[13], S44, 0x4e0811a1);
- II(a, b, c, d, x[ 4], S41, 0xf7537e82);
- II(d, a, b, c, x[11], S42, 0xbd3af235);
- II(c, d, a, b, x[ 2], S43, 0x2ad7d2bb);
- II(b, c, d, a, x[ 9], S44, 0xeb86d391);
- state[0] += a;
- state[1] += b;
- state[2] += c;
- state[3] += d;
-
- memset((void *)x, 0, sizeof(x));
- }
- static void Encode(unsigned char *output, uint32_t *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);
- }
- }
- static void Decode(uint32_t *output, unsigned char *input, unsigned int len)
- {
- unsigned int i, j;
- for (i = 0, j = 0; j < len; i++, j += 4)
- output[i] = ((uint32_t)input[j]) | (((uint32_t)input[j+1]) << 8) |
- (((uint32_t)input[j+2]) << 16) | (((uint32_t)input[j+3]) << 24);
- }
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