DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (dcc6d7a0dc00)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifdef FREEBL_NO_DEPEND
#include "stubs.h"
#endif

#include "prerr.h"
#include "secerr.h"

#include "prtypes.h"

#include "blapi.h"

#define MD2_DIGEST_LEN    16
#define MD2_BUFSIZE       16
#define MD2_X_SIZE        48  /* The X array, [CV | INPUT | TMP VARS] */
#define MD2_CV             0  /* index into X for chaining variables */
#define MD2_INPUT         16  /* index into X for input */
#define MD2_TMPVARS       32  /* index into X for temporary variables */
#define MD2_CHECKSUM_SIZE 16

struct MD2ContextStr {
	unsigned char checksum[MD2_BUFSIZE];
	unsigned char X[MD2_X_SIZE];
	PRUint8 unusedBuffer;
};

static const PRUint8 MD2S[256] = {
 0051, 0056, 0103, 0311, 0242, 0330, 0174, 0001,
 0075, 0066, 0124, 0241, 0354, 0360, 0006, 0023,
 0142, 0247, 0005, 0363, 0300, 0307, 0163, 0214,
 0230, 0223, 0053, 0331, 0274, 0114, 0202, 0312,
 0036, 0233, 0127, 0074, 0375, 0324, 0340, 0026,
 0147, 0102, 0157, 0030, 0212, 0027, 0345, 0022,
 0276, 0116, 0304, 0326, 0332, 0236, 0336, 0111,
 0240, 0373, 0365, 0216, 0273, 0057, 0356, 0172,
 0251, 0150, 0171, 0221, 0025, 0262, 0007, 0077,
 0224, 0302, 0020, 0211, 0013, 0042, 0137, 0041,
 0200, 0177, 0135, 0232, 0132, 0220, 0062, 0047,
 0065, 0076, 0314, 0347, 0277, 0367, 0227, 0003,
 0377, 0031, 0060, 0263, 0110, 0245, 0265, 0321,
 0327, 0136, 0222, 0052, 0254, 0126, 0252, 0306,
 0117, 0270, 0070, 0322, 0226, 0244, 0175, 0266,
 0166, 0374, 0153, 0342, 0234, 0164, 0004, 0361,
 0105, 0235, 0160, 0131, 0144, 0161, 0207, 0040,
 0206, 0133, 0317, 0145, 0346, 0055, 0250, 0002,
 0033, 0140, 0045, 0255, 0256, 0260, 0271, 0366,
 0034, 0106, 0141, 0151, 0064, 0100, 0176, 0017,
 0125, 0107, 0243, 0043, 0335, 0121, 0257, 0072,
 0303, 0134, 0371, 0316, 0272, 0305, 0352, 0046,
 0054, 0123, 0015, 0156, 0205, 0050, 0204, 0011,
 0323, 0337, 0315, 0364, 0101, 0201, 0115, 0122,
 0152, 0334, 0067, 0310, 0154, 0301, 0253, 0372,
 0044, 0341, 0173, 0010, 0014, 0275, 0261, 0112,
 0170, 0210, 0225, 0213, 0343, 0143, 0350, 0155,
 0351, 0313, 0325, 0376, 0073, 0000, 0035, 0071,
 0362, 0357, 0267, 0016, 0146, 0130, 0320, 0344,
 0246, 0167, 0162, 0370, 0353, 0165, 0113, 0012,
 0061, 0104, 0120, 0264, 0217, 0355, 0037, 0032,
 0333, 0231, 0215, 0063, 0237, 0021, 0203, 0024
};

SECStatus 
MD2_Hash(unsigned char *dest, const char *src)
{
	unsigned int len;
	MD2Context *cx = MD2_NewContext();
	if (!cx) {
		PORT_SetError(PR_OUT_OF_MEMORY_ERROR);
		return SECFailure;
	}
	MD2_Begin(cx);
	MD2_Update(cx, (const unsigned char *)src, PORT_Strlen(src));
	MD2_End(cx, dest, &len, MD2_DIGEST_LEN);
	MD2_DestroyContext(cx, PR_TRUE);
	return SECSuccess;
}

MD2Context *
MD2_NewContext(void)
{
	MD2Context *cx = (MD2Context *)PORT_ZAlloc(sizeof(MD2Context));
	if (cx == NULL) {
		PORT_SetError(PR_OUT_OF_MEMORY_ERROR);
		return NULL;
	}
	return cx;
}

void 
MD2_DestroyContext(MD2Context *cx, PRBool freeit)
{
	if (freeit)
		PORT_ZFree(cx, sizeof(*cx));
}

void 
MD2_Begin(MD2Context *cx)
{
	memset(cx, 0, sizeof(*cx));
	cx->unusedBuffer = MD2_BUFSIZE;
}

static void
md2_compress(MD2Context *cx)
{
	int j;
	unsigned char P;
	P = cx->checksum[MD2_CHECKSUM_SIZE-1];
	/* Compute the running checksum, and set the tmp variables to be 
	 * CV[i] XOR input[i] 
	 */
#define CKSUMFN(n) \
	P = cx->checksum[n] ^ MD2S[cx->X[MD2_INPUT+n] ^ P]; \
	cx->checksum[n] = P; \
	cx->X[MD2_TMPVARS+n] = cx->X[n] ^ cx->X[MD2_INPUT+n];
	CKSUMFN(0);
	CKSUMFN(1);
	CKSUMFN(2);
	CKSUMFN(3);
	CKSUMFN(4);
	CKSUMFN(5);
	CKSUMFN(6);
	CKSUMFN(7);
	CKSUMFN(8);
	CKSUMFN(9);
	CKSUMFN(10);
	CKSUMFN(11);
	CKSUMFN(12);
	CKSUMFN(13);
	CKSUMFN(14);
	CKSUMFN(15);
	/* The compression function. */
#define COMPRESS(n) \
	P = cx->X[n] ^ MD2S[P]; \
	cx->X[n] = P;
	P = 0x00;
	for (j=0; j<18; j++) {
		COMPRESS(0);
		COMPRESS(1);
		COMPRESS(2);
		COMPRESS(3);
		COMPRESS(4);
		COMPRESS(5);
		COMPRESS(6);
		COMPRESS(7);
		COMPRESS(8);
		COMPRESS(9);
		COMPRESS(10);
		COMPRESS(11);
		COMPRESS(12);
		COMPRESS(13);
		COMPRESS(14);
		COMPRESS(15);
		COMPRESS(16);
		COMPRESS(17);
		COMPRESS(18);
		COMPRESS(19);
		COMPRESS(20);
		COMPRESS(21);
		COMPRESS(22);
		COMPRESS(23);
		COMPRESS(24);
		COMPRESS(25);
		COMPRESS(26);
		COMPRESS(27);
		COMPRESS(28);
		COMPRESS(29);
		COMPRESS(30);
		COMPRESS(31);
		COMPRESS(32);
		COMPRESS(33);
		COMPRESS(34);
		COMPRESS(35);
		COMPRESS(36);
		COMPRESS(37);
		COMPRESS(38);
		COMPRESS(39);
		COMPRESS(40);
		COMPRESS(41);
		COMPRESS(42);
		COMPRESS(43);
		COMPRESS(44);
		COMPRESS(45);
		COMPRESS(46);
		COMPRESS(47);
		P = (P + j) % 256;
	}
	cx->unusedBuffer = MD2_BUFSIZE;
}

void 
MD2_Update(MD2Context *cx, const unsigned char *input, unsigned int inputLen)
{
	PRUint32 bytesToConsume;
	
	/* Fill the remaining input buffer. */
	if (cx->unusedBuffer != MD2_BUFSIZE) {
		bytesToConsume = PR_MIN(inputLen, cx->unusedBuffer);
		memcpy(&cx->X[MD2_INPUT + (MD2_BUFSIZE - cx->unusedBuffer)],
		            input, bytesToConsume);
		if (cx->unusedBuffer + bytesToConsume >= MD2_BUFSIZE)
			md2_compress(cx);
		inputLen -= bytesToConsume;
		input += bytesToConsume;
	}

	/* Iterate over 16-byte chunks of the input. */
	while (inputLen >= MD2_BUFSIZE) {
		memcpy(&cx->X[MD2_INPUT], input, MD2_BUFSIZE);
		md2_compress(cx);
		inputLen -= MD2_BUFSIZE;
		input += MD2_BUFSIZE;
	}

	/* Copy any input that remains into the buffer. */
	if (inputLen)
		memcpy(&cx->X[MD2_INPUT], input, inputLen);
	cx->unusedBuffer = MD2_BUFSIZE - inputLen;
}

void 
MD2_End(MD2Context *cx, unsigned char *digest,
        unsigned int *digestLen, unsigned int maxDigestLen)
{
	PRUint8 padStart;
	if (maxDigestLen < MD2_BUFSIZE) {
		PORT_SetError(SEC_ERROR_INVALID_ARGS);
		return;
	}
	padStart = MD2_BUFSIZE - cx->unusedBuffer;
	memset(&cx->X[MD2_INPUT + padStart], cx->unusedBuffer, 
	            cx->unusedBuffer);
	md2_compress(cx);
	memcpy(&cx->X[MD2_INPUT], cx->checksum, MD2_BUFSIZE);
	md2_compress(cx);
	*digestLen = MD2_DIGEST_LEN;
	memcpy(digest, &cx->X[MD2_CV], MD2_DIGEST_LEN);
}

unsigned int 
MD2_FlattenSize(MD2Context *cx)
{
	return sizeof(*cx);
}

SECStatus 
MD2_Flatten(MD2Context *cx, unsigned char *space)
{
	memcpy(space, cx, sizeof(*cx));
	return SECSuccess;
}

MD2Context * 
MD2_Resurrect(unsigned char *space, void *arg)
{
	MD2Context *cx = MD2_NewContext();
	if (cx)
		memcpy(cx, space, sizeof(*cx));
	return cx;
}

void MD2_Clone(MD2Context *dest, MD2Context *src) 
{
	memcpy(dest, src, sizeof *dest);
}