/* 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);

}