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Annotation of quake2/qcommon/md4.c, revision 1.1

1.1     ! root        1: /* GLOBAL.H - RSAREF types and constants */
        !             2: 
        !             3: #include <string.h>
        !             4: 
        !             5: /* POINTER defines a generic pointer type */
        !             6: typedef unsigned char *POINTER;
        !             7: 
        !             8: /* UINT2 defines a two byte word */
        !             9: typedef unsigned short int UINT2;
        !            10: 
        !            11: /* UINT4 defines a four byte word */
        !            12: typedef unsigned long int UINT4;
        !            13: 
        !            14:   
        !            15: /* MD4.H - header file for MD4C.C */
        !            16: 
        !            17: /* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. 
        !            18: 
        !            19: All rights reserved.
        !            20:   
        !            21: License to copy and use this software is granted provided that it is identified as the �RSA Data Security, Inc. MD4 Message-Digest Algorithm� in all material mentioning or referencing this software or this function.
        !            22: License is also granted to make and use derivative works provided that such works are identified as �derived from the RSA Data Security, Inc. MD4 Message-Digest Algorithm� in all material mentioning or referencing the derived work.
        !            23: 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.
        !            24:   
        !            25: These notices must be retained in any copies of any part of this documentation and/or software. */
        !            26: 
        !            27: /* MD4 context. */
        !            28: typedef struct {
        !            29:        UINT4 state[4];                         /* state (ABCD) */
        !            30:        UINT4 count[2];                         /* number of bits, modulo 2^64 (lsb first) */
        !            31:        unsigned char buffer[64];                       /* input buffer */
        !            32: } MD4_CTX;
        !            33: 
        !            34: void MD4Init (MD4_CTX *);
        !            35: void MD4Update (MD4_CTX *, unsigned char *, unsigned int);
        !            36: void MD4Final (unsigned char [16], MD4_CTX *);
        !            37:   
        !            38: 
        !            39:   
        !            40: /* MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm */
        !            41: /* Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.
        !            42:   
        !            43: License to copy and use this software is granted provided that it is identified as the
        !            44: RSA Data Security, Inc. MD4 Message-Digest Algorithm
        !            45:  in all material mentioning or referencing this software or this function.
        !            46: License is also granted to make and use derivative works provided that such works are identified as 
        !            47: derived from the RSA Data Security, Inc. MD4 Message-Digest Algorithm
        !            48: in all material mentioning or referencing the derived work.
        !            49: 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
        !            50: as is without express or implied warranty of any kind.
        !            51:   
        !            52: These notices must be retained in any copies of any part of this documentation and/or software. */
        !            53: 
        !            54: /* Constants for MD4Transform routine.  */
        !            55: #define S11 3
        !            56: #define S12 7
        !            57: #define S13 11
        !            58: #define S14 19
        !            59: #define S21 3
        !            60: #define S22 5
        !            61: #define S23 9
        !            62: #define S24 13
        !            63: #define S31 3
        !            64: #define S32 9
        !            65: #define S33 11
        !            66: #define S34 15
        !            67: 
        !            68: static void MD4Transform (UINT4 [4], unsigned char [64]);
        !            69: static void Encode (unsigned char *, UINT4 *, unsigned int);
        !            70: static void Decode (UINT4 *, unsigned char *, unsigned int);
        !            71: 
        !            72: static unsigned char PADDING[64] = {
        !            73: 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
        !            74: };
        !            75: 
        !            76: /* F, G and H are basic MD4 functions. */
        !            77: #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
        !            78: #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
        !            79: #define H(x, y, z) ((x) ^ (y) ^ (z))
        !            80: 
        !            81: /* ROTATE_LEFT rotates x left n bits. */
        !            82: #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
        !            83: 
        !            84: /* FF, GG and HH are transformations for rounds 1, 2 and 3 */
        !            85: /* Rotation is separate from addition to prevent recomputation */
        !            86: #define FF(a, b, c, d, x, s) {(a) += F ((b), (c), (d)) + (x); (a) = ROTATE_LEFT ((a), (s));}
        !            87: 
        !            88: #define GG(a, b, c, d, x, s) {(a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; (a) = ROTATE_LEFT ((a), (s));}
        !            89: 
        !            90: #define HH(a, b, c, d, x, s) {(a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; (a) = ROTATE_LEFT ((a), (s));}
        !            91: 
        !            92: 
        !            93: /* MD4 initialization. Begins an MD4 operation, writing a new context. */
        !            94: void MD4Init (MD4_CTX *context)
        !            95: {
        !            96:        context->count[0] = context->count[1] = 0;
        !            97: 
        !            98: /* Load magic initialization constants.*/
        !            99: context->state[0] = 0x67452301;
        !           100: context->state[1] = 0xefcdab89;
        !           101: context->state[2] = 0x98badcfe;
        !           102: context->state[3] = 0x10325476;
        !           103: }
        !           104: 
        !           105: /* MD4 block update operation. Continues an MD4 message-digest operation, processing another message block, and updating the context. */
        !           106: void MD4Update (MD4_CTX *context, unsigned char *input, unsigned int inputLen)
        !           107: {
        !           108:        unsigned int i, index, partLen;
        !           109: 
        !           110:        /* Compute number of bytes mod 64 */
        !           111:        index = (unsigned int)((context->count[0] >> 3) & 0x3F);
        !           112: 
        !           113:        /* Update number of bits */
        !           114:        if ((context->count[0] += ((UINT4)inputLen << 3))< ((UINT4)inputLen << 3))
        !           115:                context->count[1]++;
        !           116: 
        !           117:        context->count[1] += ((UINT4)inputLen >> 29);
        !           118: 
        !           119:        partLen = 64 - index;
        !           120: 
        !           121:        /* Transform as many times as possible.*/
        !           122:        if (inputLen >= partLen)
        !           123:        {
        !           124:                memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);
        !           125:                MD4Transform (context->state, context->buffer);
        !           126: 
        !           127:                for (i = partLen; i + 63 < inputLen; i += 64)
        !           128:                        MD4Transform (context->state, &input[i]);
        !           129: 
        !           130:                index = 0;
        !           131:        }
        !           132:        else
        !           133:                i = 0;
        !           134: 
        !           135:        /* Buffer remaining input */
        !           136:        memcpy ((POINTER)&context->buffer[index], (POINTER)&input[i], inputLen-i);
        !           137: }
        !           138: 
        !           139: 
        !           140: /* MD4 finalization. Ends an MD4 message-digest operation, writing the the message digest and zeroizing the context. */
        !           141: void MD4Final (unsigned char digest[16], MD4_CTX *context)
        !           142: {
        !           143:        unsigned char bits[8];
        !           144:        unsigned int index, padLen;
        !           145: 
        !           146:        /* Save number of bits */
        !           147:        Encode (bits, context->count, 8);
        !           148: 
        !           149:        /* Pad out to 56 mod 64.*/
        !           150:        index = (unsigned int)((context->count[0] >> 3) & 0x3f);
        !           151:        padLen = (index < 56) ? (56 - index) : (120 - index);
        !           152:        MD4Update (context, PADDING, padLen);
        !           153: 
        !           154:        /* Append length (before padding) */
        !           155:        MD4Update (context, bits, 8);
        !           156:        
        !           157:        /* Store state in digest */
        !           158:        Encode (digest, context->state, 16);
        !           159: 
        !           160:        /* Zeroize sensitive information.*/
        !           161:        memset ((POINTER)context, 0, sizeof (*context));
        !           162: }
        !           163: 
        !           164: 
        !           165: /* MD4 basic transformation. Transforms state based on block. */
        !           166: static void MD4Transform (UINT4 state[4], unsigned char block[64])
        !           167: {
        !           168:        UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
        !           169: 
        !           170:        Decode (x, block, 64);
        !           171: 
        !           172: /* Round 1 */
        !           173: FF (a, b, c, d, x[ 0], S11);                           /* 1 */
        !           174: FF (d, a, b, c, x[ 1], S12);                           /* 2 */
        !           175: FF (c, d, a, b, x[ 2], S13);                           /* 3 */
        !           176: FF (b, c, d, a, x[ 3], S14);                           /* 4 */
        !           177: FF (a, b, c, d, x[ 4], S11);                           /* 5 */
        !           178: FF (d, a, b, c, x[ 5], S12);                           /* 6 */
        !           179: FF (c, d, a, b, x[ 6], S13);                           /* 7 */
        !           180: FF (b, c, d, a, x[ 7], S14);                           /* 8 */
        !           181: FF (a, b, c, d, x[ 8], S11);                           /* 9 */
        !           182: FF (d, a, b, c, x[ 9], S12);                           /* 10 */
        !           183: FF (c, d, a, b, x[10], S13);                   /* 11 */
        !           184: FF (b, c, d, a, x[11], S14);                   /* 12 */
        !           185: FF (a, b, c, d, x[12], S11);                   /* 13 */
        !           186: FF (d, a, b, c, x[13], S12);                   /* 14 */
        !           187: FF (c, d, a, b, x[14], S13);                   /* 15 */
        !           188: FF (b, c, d, a, x[15], S14);                   /* 16 */
        !           189: 
        !           190: /* Round 2 */
        !           191: GG (a, b, c, d, x[ 0], S21);                   /* 17 */
        !           192: GG (d, a, b, c, x[ 4], S22);                   /* 18 */
        !           193: GG (c, d, a, b, x[ 8], S23);                   /* 19 */
        !           194: GG (b, c, d, a, x[12], S24);                   /* 20 */
        !           195: GG (a, b, c, d, x[ 1], S21);                   /* 21 */
        !           196: GG (d, a, b, c, x[ 5], S22);                   /* 22 */
        !           197: GG (c, d, a, b, x[ 9], S23);                   /* 23 */
        !           198: GG (b, c, d, a, x[13], S24);                   /* 24 */
        !           199: GG (a, b, c, d, x[ 2], S21);                   /* 25 */
        !           200: GG (d, a, b, c, x[ 6], S22);                   /* 26 */
        !           201: GG (c, d, a, b, x[10], S23);                   /* 27 */
        !           202: GG (b, c, d, a, x[14], S24);                   /* 28 */
        !           203: GG (a, b, c, d, x[ 3], S21);                   /* 29 */
        !           204: GG (d, a, b, c, x[ 7], S22);                   /* 30 */
        !           205: GG (c, d, a, b, x[11], S23);                   /* 31 */
        !           206: GG (b, c, d, a, x[15], S24);                   /* 32 */
        !           207: 
        !           208: /* Round 3 */
        !           209: HH (a, b, c, d, x[ 0], S31);                           /* 33 */
        !           210: HH (d, a, b, c, x[ 8], S32);                   /* 34 */
        !           211: HH (c, d, a, b, x[ 4], S33);                   /* 35 */
        !           212: HH (b, c, d, a, x[12], S34);                   /* 36 */
        !           213: HH (a, b, c, d, x[ 2], S31);                   /* 37 */
        !           214: HH (d, a, b, c, x[10], S32);                   /* 38 */
        !           215: HH (c, d, a, b, x[ 6], S33);                   /* 39 */
        !           216: HH (b, c, d, a, x[14], S34);                   /* 40 */
        !           217: HH (a, b, c, d, x[ 1], S31);                   /* 41 */
        !           218: HH (d, a, b, c, x[ 9], S32);                   /* 42 */
        !           219: HH (c, d, a, b, x[ 5], S33);                   /* 43 */
        !           220: HH (b, c, d, a, x[13], S34);                   /* 44 */
        !           221: HH (a, b, c, d, x[ 3], S31);                   /* 45 */
        !           222: HH (d, a, b, c, x[11], S32);                   /* 46 */
        !           223: HH (c, d, a, b, x[ 7], S33);                   /* 47 */
        !           224: HH (b, c, d, a, x[15], S34);                   /* 48 */
        !           225: 
        !           226: state[0] += a;
        !           227: state[1] += b;
        !           228: state[2] += c;
        !           229: state[3] += d;
        !           230: 
        !           231:        /* Zeroize sensitive information.*/
        !           232:        memset ((POINTER)x, 0, sizeof (x));
        !           233: }
        !           234: 
        !           235: 
        !           236: /* Encodes input (UINT4) into output (unsigned char). Assumes len is a multiple of 4. */
        !           237: static void Encode (unsigned char *output, UINT4 *input, unsigned int len)
        !           238: {
        !           239:        unsigned int i, j;
        !           240: 
        !           241:        for (i = 0, j = 0; j < len; i++, j += 4) {
        !           242:                output[j] = (unsigned char)(input[i] & 0xff);
        !           243:                output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
        !           244:                output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
        !           245:                output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
        !           246:        }
        !           247: }
        !           248: 
        !           249: 
        !           250: /* Decodes input (unsigned char) into output (UINT4). Assumes len is a multiple of 4. */
        !           251: static void Decode (UINT4 *output, unsigned char *input, unsigned int len)
        !           252: {
        !           253: unsigned int i, j;
        !           254: 
        !           255: for (i = 0, j = 0; j < len; i++, j += 4)
        !           256:        output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) | (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
        !           257: }
        !           258: 
        !           259: //===================================================================
        !           260: 
        !           261: unsigned Com_BlockChecksum (void *buffer, int length)
        !           262: {
        !           263:        int                     digest[4];
        !           264:        unsigned        val;
        !           265:        MD4_CTX         ctx;
        !           266: 
        !           267:        MD4Init (&ctx);
        !           268:        MD4Update (&ctx, (unsigned char *)buffer, length);
        !           269:        MD4Final ( (unsigned char *)digest, &ctx);
        !           270:        
        !           271:        val = digest[0] ^ digest[1] ^ digest[2] ^ digest[3];
        !           272: 
        !           273:        return val;
        !           274: }

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