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- #include <string.h>
- typedef unsigned char *POINTER;
- typedef unsigned short int UINT2;
- #ifdef __alpha__
- typedef unsigned int UINT4;
- #else
- typedef unsigned long int UINT4;
- #endif
-
- typedef struct {
- UINT4 state[4];
- UINT4 count[2];
- unsigned char buffer[64];
- } MD4_CTX;
- void MD4Init (MD4_CTX *);
- void MD4Update (MD4_CTX *, unsigned char *, unsigned int);
- void MD4Final (unsigned char [16], MD4_CTX *);
-
-
- #define S11 3
- #define S12 7
- #define S13 11
- #define S14 19
- #define S21 3
- #define S22 5
- #define S23 9
- #define S24 13
- #define S31 3
- #define S32 9
- #define S33 11
- #define S34 15
- static void MD4Transform (UINT4 [4], unsigned char [64]);
- static void Encode (unsigned char *, UINT4 *, unsigned int);
- static void Decode (UINT4 *, 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) & (y)) | ((x) & (z)) | ((y) & (z)))
- #define H(x, y, z) ((x) ^ (y) ^ (z))
- #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
- #define FF(a, b, c, d, x, s) {(a) += F ((b), (c), (d)) + (x); (a) = ROTATE_LEFT ((a), (s));}
- #define GG(a, b, c, d, x, s) {(a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; (a) = ROTATE_LEFT ((a), (s));}
- #define HH(a, b, c, d, x, s) {(a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; (a) = ROTATE_LEFT ((a), (s));}
- void MD4Init (MD4_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 MD4Update (MD4_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] += ((UINT4)inputLen << 3))< ((UINT4)inputLen << 3))
- context->count[1]++;
- context->count[1] += ((UINT4)inputLen >> 29);
- partLen = 64 - index;
-
- if (inputLen >= partLen)
- {
- memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);
- MD4Transform (context->state, context->buffer);
- for (i = partLen; i + 63 < inputLen; i += 64)
- MD4Transform (context->state, &input[i]);
- index = 0;
- }
- else
- i = 0;
-
- memcpy ((POINTER)&context->buffer[index], (POINTER)&input[i], inputLen-i);
- }
- void MD4Final (unsigned char digest[16], MD4_CTX *context)
- {
- unsigned char bits[8];
- unsigned int index, padLen;
-
- Encode (bits, context->count, 8);
-
- index = (unsigned int)((context->count[0] >> 3) & 0x3f);
- padLen = (index < 56) ? (56 - index) : (120 - index);
- MD4Update (context, PADDING, padLen);
-
- MD4Update (context, bits, 8);
-
-
- Encode (digest, context->state, 16);
-
- memset ((POINTER)context, 0, sizeof (*context));
- }
- static void MD4Transform (UINT4 state[4], unsigned char block[64])
- {
- UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
- Decode (x, block, 64);
- FF (a, b, c, d, x[ 0], S11);
- FF (d, a, b, c, x[ 1], S12);
- FF (c, d, a, b, x[ 2], S13);
- FF (b, c, d, a, x[ 3], S14);
- FF (a, b, c, d, x[ 4], S11);
- FF (d, a, b, c, x[ 5], S12);
- FF (c, d, a, b, x[ 6], S13);
- FF (b, c, d, a, x[ 7], S14);
- FF (a, b, c, d, x[ 8], S11);
- FF (d, a, b, c, x[ 9], S12);
- FF (c, d, a, b, x[10], S13);
- FF (b, c, d, a, x[11], S14);
- FF (a, b, c, d, x[12], S11);
- FF (d, a, b, c, x[13], S12);
- FF (c, d, a, b, x[14], S13);
- FF (b, c, d, a, x[15], S14);
- GG (a, b, c, d, x[ 0], S21);
- GG (d, a, b, c, x[ 4], S22);
- GG (c, d, a, b, x[ 8], S23);
- GG (b, c, d, a, x[12], S24);
- GG (a, b, c, d, x[ 1], S21);
- GG (d, a, b, c, x[ 5], S22);
- GG (c, d, a, b, x[ 9], S23);
- GG (b, c, d, a, x[13], S24);
- GG (a, b, c, d, x[ 2], S21);
- GG (d, a, b, c, x[ 6], S22);
- GG (c, d, a, b, x[10], S23);
- GG (b, c, d, a, x[14], S24);
- GG (a, b, c, d, x[ 3], S21);
- GG (d, a, b, c, x[ 7], S22);
- GG (c, d, a, b, x[11], S23);
- GG (b, c, d, a, x[15], S24);
- HH (a, b, c, d, x[ 0], S31);
- HH (d, a, b, c, x[ 8], S32);
- HH (c, d, a, b, x[ 4], S33);
- HH (b, c, d, a, x[12], S34);
- HH (a, b, c, d, x[ 2], S31);
- HH (d, a, b, c, x[10], S32);
- HH (c, d, a, b, x[ 6], S33);
- HH (b, c, d, a, x[14], S34);
- HH (a, b, c, d, x[ 1], S31);
- HH (d, a, b, c, x[ 9], S32);
- HH (c, d, a, b, x[ 5], S33);
- HH (b, c, d, a, x[13], S34);
- HH (a, b, c, d, x[ 3], S31);
- HH (d, a, b, c, x[11], S32);
- HH (c, d, a, b, x[ 7], S33);
- HH (b, c, d, a, x[15], S34);
- state[0] += a;
- state[1] += b;
- state[2] += c;
- state[3] += d;
-
- memset ((POINTER)x, 0, sizeof (x));
- }
- static void Encode (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);
- }
- }
- static void Decode (UINT4 *output, 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);
- }
- unsigned Com_BlockChecksum (void *buffer, int length)
- {
- int digest[4];
- unsigned val;
- MD4_CTX ctx;
- MD4Init (&ctx);
- MD4Update (&ctx, (unsigned char *)buffer, length);
- MD4Final ( (unsigned char *)digest, &ctx);
-
- val = digest[0] ^ digest[1] ^ digest[2] ^ digest[3];
- return val;
- }
- void Com_BlockFullChecksum (void *buffer, int len, unsigned char *outbuf)
- {
- MD4_CTX ctx;
- MD4Init (&ctx);
- MD4Update (&ctx, (unsigned char *)buffer, len);
- MD4Final ( outbuf, &ctx);
- }
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