255 lines
6.7 KiB
C
255 lines
6.7 KiB
C
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#include "md5.h"
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#include <string.h>
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#include "stdio.h"
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/*
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* 32-bit integer manipulation macros (little endian)
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*/
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#ifndef GET_ULONG_LE
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#define GET_ULONG_LE(n,b,i) \
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{ \
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(n) = ( (unsigned long) (b)[(i) ] ) \
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| ( (unsigned long) (b)[(i) + 1] << 8 ) \
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| ( (unsigned long) (b)[(i) + 2] << 16 ) \
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| ( (unsigned long) (b)[(i) + 3] << 24 ); \
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}
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#endif
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#ifndef PUT_ULONG_LE
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#define PUT_ULONG_LE(n,b,i) \
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{ \
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(b)[(i) ] = (unsigned char) ( (n) ); \
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(b)[(i) + 1] = (unsigned char) ( (n) >> 8 ); \
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(b)[(i) + 2] = (unsigned char) ( (n) >> 16 ); \
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(b)[(i) + 3] = (unsigned char) ( (n) >> 24 ); \
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}
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#endif
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/*
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* MD5 context setup
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*/
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void md5_starts(md5_context* ctx)
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{
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ctx->total[0] = 0;
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ctx->total[1] = 0;
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ctx->state[0] = 0x67452301;
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ctx->state[1] = 0xEFCDAB89;
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ctx->state[2] = 0x98BADCFE;
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ctx->state[3] = 0x10325476;
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}
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static void md5_process(md5_context* ctx, const unsigned char data[64])
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{
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unsigned long X[16], A, B, C, D;
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GET_ULONG_LE(X[0], data, 0);
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GET_ULONG_LE(X[1], data, 4);
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GET_ULONG_LE(X[2], data, 8);
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GET_ULONG_LE(X[3], data, 12);
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GET_ULONG_LE(X[4], data, 16);
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GET_ULONG_LE(X[5], data, 20);
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GET_ULONG_LE(X[6], data, 24);
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GET_ULONG_LE(X[7], data, 28);
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GET_ULONG_LE(X[8], data, 32);
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GET_ULONG_LE(X[9], data, 36);
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GET_ULONG_LE(X[10], data, 40);
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GET_ULONG_LE(X[11], data, 44);
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GET_ULONG_LE(X[12], data, 48);
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GET_ULONG_LE(X[13], data, 52);
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GET_ULONG_LE(X[14], data, 56);
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GET_ULONG_LE(X[15], data, 60);
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#define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))
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#define P(a,b,c,d,k,s,t) \
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{ \
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a += F(b,c,d) + X[k] + t; a = S(a,s) + b; \
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}
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A = ctx->state[0];
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B = ctx->state[1];
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C = ctx->state[2];
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D = ctx->state[3];
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#define F(x,y,z) (z ^ (x & (y ^ z)))
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P(A, B, C, D, 0, 7, 0xD76AA478);
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P(D, A, B, C, 1, 12, 0xE8C7B756);
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P(C, D, A, B, 2, 17, 0x242070DB);
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P(B, C, D, A, 3, 22, 0xC1BDCEEE);
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P(A, B, C, D, 4, 7, 0xF57C0FAF);
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P(D, A, B, C, 5, 12, 0x4787C62A);
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P(C, D, A, B, 6, 17, 0xA8304613);
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P(B, C, D, A, 7, 22, 0xFD469501);
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P(A, B, C, D, 8, 7, 0x698098D8);
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P(D, A, B, C, 9, 12, 0x8B44F7AF);
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P(C, D, A, B, 10, 17, 0xFFFF5BB1);
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P(B, C, D, A, 11, 22, 0x895CD7BE);
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P(A, B, C, D, 12, 7, 0x6B901122);
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P(D, A, B, C, 13, 12, 0xFD987193);
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P(C, D, A, B, 14, 17, 0xA679438E);
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P(B, C, D, A, 15, 22, 0x49B40821);
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#undef F
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#define F(x,y,z) (y ^ (z & (x ^ y)))
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P(A, B, C, D, 1, 5, 0xF61E2562);
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P(D, A, B, C, 6, 9, 0xC040B340);
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P(C, D, A, B, 11, 14, 0x265E5A51);
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P(B, C, D, A, 0, 20, 0xE9B6C7AA);
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P(A, B, C, D, 5, 5, 0xD62F105D);
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P(D, A, B, C, 10, 9, 0x02441453);
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P(C, D, A, B, 15, 14, 0xD8A1E681);
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P(B, C, D, A, 4, 20, 0xE7D3FBC8);
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P(A, B, C, D, 9, 5, 0x21E1CDE6);
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P(D, A, B, C, 14, 9, 0xC33707D6);
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P(C, D, A, B, 3, 14, 0xF4D50D87);
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P(B, C, D, A, 8, 20, 0x455A14ED);
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P(A, B, C, D, 13, 5, 0xA9E3E905);
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P(D, A, B, C, 2, 9, 0xFCEFA3F8);
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P(C, D, A, B, 7, 14, 0x676F02D9);
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P(B, C, D, A, 12, 20, 0x8D2A4C8A);
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#undef F
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#define F(x,y,z) (x ^ y ^ z)
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P(A, B, C, D, 5, 4, 0xFFFA3942);
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P(D, A, B, C, 8, 11, 0x8771F681);
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P(C, D, A, B, 11, 16, 0x6D9D6122);
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P(B, C, D, A, 14, 23, 0xFDE5380C);
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P(A, B, C, D, 1, 4, 0xA4BEEA44);
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P(D, A, B, C, 4, 11, 0x4BDECFA9);
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P(C, D, A, B, 7, 16, 0xF6BB4B60);
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P(B, C, D, A, 10, 23, 0xBEBFBC70);
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P(A, B, C, D, 13, 4, 0x289B7EC6);
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P(D, A, B, C, 0, 11, 0xEAA127FA);
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P(C, D, A, B, 3, 16, 0xD4EF3085);
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P(B, C, D, A, 6, 23, 0x04881D05);
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P(A, B, C, D, 9, 4, 0xD9D4D039);
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P(D, A, B, C, 12, 11, 0xE6DB99E5);
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P(C, D, A, B, 15, 16, 0x1FA27CF8);
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P(B, C, D, A, 2, 23, 0xC4AC5665);
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#undef F
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#define F(x,y,z) (y ^ (x | ~z))
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P(A, B, C, D, 0, 6, 0xF4292244);
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P(D, A, B, C, 7, 10, 0x432AFF97);
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P(C, D, A, B, 14, 15, 0xAB9423A7);
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P(B, C, D, A, 5, 21, 0xFC93A039);
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P(A, B, C, D, 12, 6, 0x655B59C3);
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P(D, A, B, C, 3, 10, 0x8F0CCC92);
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P(C, D, A, B, 10, 15, 0xFFEFF47D);
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P(B, C, D, A, 1, 21, 0x85845DD1);
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P(A, B, C, D, 8, 6, 0x6FA87E4F);
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P(D, A, B, C, 15, 10, 0xFE2CE6E0);
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P(C, D, A, B, 6, 15, 0xA3014314);
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P(B, C, D, A, 13, 21, 0x4E0811A1);
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P(A, B, C, D, 4, 6, 0xF7537E82);
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P(D, A, B, C, 11, 10, 0xBD3AF235);
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P(C, D, A, B, 2, 15, 0x2AD7D2BB);
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P(B, C, D, A, 9, 21, 0xEB86D391);
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#undef F
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ctx->state[0] += A;
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ctx->state[1] += B;
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ctx->state[2] += C;
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ctx->state[3] += D;
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}
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/*
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* MD5 process buffer
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*/
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void md5_update(md5_context* ctx, const unsigned char* input, int ilen)
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{
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int fill;
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unsigned long left;
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if (ilen <= 0)
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return;
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left = ctx->total[0] & 0x3F;
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fill = 64 - left;
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ctx->total[0] += ilen;
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ctx->total[0] &= 0xFFFFFFFF;
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if (ctx->total[0] < (unsigned long)ilen)
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ctx->total[1]++;
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if (left && ilen >= fill)
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{
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memcpy((void*)(ctx->buffer + left),
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input, fill);
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md5_process(ctx, ctx->buffer);
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input += fill;
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ilen -= fill;
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left = 0;
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}
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while (ilen >= 64)
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{
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md5_process(ctx, input);
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input += 64;
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ilen -= 64;
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}
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if (ilen > 0)
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{
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memcpy((void*)(ctx->buffer + left),
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input, ilen);
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}
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}
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static const unsigned char md5_padding[64] =
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{
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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/*
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* MD5 final digest
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*/
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void md5_finish(md5_context* ctx, unsigned char output[16])
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{
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unsigned long last, padn;
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unsigned long high, low;
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unsigned char msglen[8];
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high = (ctx->total[0] >> 29)
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| (ctx->total[1] << 3);
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low = (ctx->total[0] << 3);
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PUT_ULONG_LE(low, msglen, 0);
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PUT_ULONG_LE(high, msglen, 4);
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last = ctx->total[0] & 0x3F;
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padn = (last < 56) ? (56 - last) : (120 - last);
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md5_update(ctx, md5_padding, padn);
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md5_update(ctx, msglen, 8);
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PUT_ULONG_LE(ctx->state[0], output, 0);
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PUT_ULONG_LE(ctx->state[1], output, 4);
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PUT_ULONG_LE(ctx->state[2], output, 8);
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PUT_ULONG_LE(ctx->state[3], output, 12);
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}
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/*
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* output = MD5( input buffer )
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*/
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void md5(unsigned char* input, int ilen, unsigned char output[16])
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{
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md5_context ctx;
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memset(&ctx, 0, sizeof(md5_context));
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md5_starts(&ctx);
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md5_update(&ctx, input, ilen);
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md5_finish(&ctx, output);
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}
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