[thirdparty/openssl.git] / crypto / rsa / rsa_pk1.c

/* crypto/rsa/rsa_pk1.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/bn.h>
#include <openssl/rsa.h>
#include <openssl/rand.h>

int RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen,
	     const unsigned char *from, int flen)
	{
	int j;
	unsigned char *p;

	if (flen > (tlen-11))
		{
		RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_1,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
		return(0);
		}
	
	p=(unsigned char *)to;

	*(p++)=0;
	*(p++)=1; /* Private Key BT (Block Type) */

	/* pad out with 0xff data */
	j=tlen-3-flen;
	memset(p,0xff,j);
	p+=j;
	*(p++)='\0';
	memcpy(p,from,(unsigned int)flen);
	return(1);
	}

int RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen,
	     const unsigned char *from, int flen, int num)
	{
	int i,j;
	const unsigned char *p;

	p=from;
	if ((num != (flen+1)) || (*(p++) != 01))
		{
		RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BLOCK_TYPE_IS_NOT_01);
		return(-1);
		}

	/* scan over padding data */
	j=flen-1; /* one for type. */
	for (i=0; i<j; i++)
		{
		if (*p != 0xff) /* should decrypt to 0xff */
			{
			if (*p == 0)
				{ p++; break; }
			else	{
				RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BAD_FIXED_HEADER_DECRYPT);
				return(-1);
				}
			}
		p++;
		}

	if (i == j)
		{
		RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_NULL_BEFORE_BLOCK_MISSING);
		return(-1);
		}

	if (i < 8)
		{
		RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BAD_PAD_BYTE_COUNT);
		return(-1);
		}
	i++; /* Skip over the '\0' */
	j-=i;
	if (j > tlen)
		{
		RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_DATA_TOO_LARGE);
		return(-1);
		}
	memcpy(to,p,(unsigned int)j);

	return(j);
	}

int RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen,
	     const unsigned char *from, int flen)
	{
	int i,j;
	unsigned char *p;
	
	if (flen > (tlen-11))
		{
		RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_2,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
		return(0);
		}
	
	p=(unsigned char *)to;

	*(p++)=0;
	*(p++)=2; /* Public Key BT (Block Type) */

	/* pad out with non-zero random data */
	j=tlen-3-flen;

	if (RAND_bytes(p,j) <= 0)
		return(0);
	for (i=0; i<j; i++)
		{
		if (*p == '\0')
			do	{
				if (RAND_bytes(p,1) <= 0)
					return(0);
				} while (*p == '\0');
		p++;
		}

	*(p++)='\0';

	memcpy(p,from,(unsigned int)flen);
	return(1);
	}

int RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen,
	     const unsigned char *from, int flen, int num)
	{
	int i,j;
	const unsigned char *p;

	p=from;
	if ((num != (flen+1)) || (*(p++) != 02))
		{
		RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_BLOCK_TYPE_IS_NOT_02);
		return(-1);
		}
#ifdef PKCS1_CHECK
	return(num-11);
#endif

	/* scan over padding data */
	j=flen-1; /* one for type. */
	for (i=0; i<j; i++)
		if (*(p++) == 0) break;

	if (i == j)
		{
		RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_NULL_BEFORE_BLOCK_MISSING);
		return(-1);
		}

	if (i < 8)
		{
		RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_BAD_PAD_BYTE_COUNT);
		return(-1);
		}
	i++; /* Skip over the '\0' */
	j-=i;
	if (j > tlen)
		{
		RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_DATA_TOO_LARGE);
		return(-1);
		}
	memcpy(to,p,(unsigned int)j);

	return(j);
	}
Commit	Line	Data
58964a49 RE	1	/* crypto/rsa/rsa_pk1.c */
	2	/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
	3	* All rights reserved.
	4	*
	5	* This package is an SSL implementation written
	6	* by Eric Young (eay@cryptsoft.com).
	7	* The implementation was written so as to conform with Netscapes SSL.
	8	*
	9	* This library is free for commercial and non-commercial use as long as
	10	* the following conditions are aheared to. The following conditions
	11	* apply to all code found in this distribution, be it the RC4, RSA,
	12	* lhash, DES, etc., code; not just the SSL code. The SSL documentation
	13	* included with this distribution is covered by the same copyright terms
	14	* except that the holder is Tim Hudson (tjh@cryptsoft.com).
	15	*
	16	* Copyright remains Eric Young's, and as such any Copyright notices in
	17	* the code are not to be removed.
	18	* If this package is used in a product, Eric Young should be given attribution
	19	* as the author of the parts of the library used.
	20	* This can be in the form of a textual message at program startup or
	21	* in documentation (online or textual) provided with the package.
	22	*
	23	* Redistribution and use in source and binary forms, with or without
	24	* modification, are permitted provided that the following conditions
	25	* are met:
	26	* 1. Redistributions of source code must retain the copyright
	27	* notice, this list of conditions and the following disclaimer.
	28	* 2. Redistributions in binary form must reproduce the above copyright
	29	* notice, this list of conditions and the following disclaimer in the
	30	* documentation and/or other materials provided with the distribution.
	31	* 3. All advertising materials mentioning features or use of this software
	32	* must display the following acknowledgement:
	33	* "This product includes cryptographic software written by
	34	* Eric Young (eay@cryptsoft.com)"
	35	* The word 'cryptographic' can be left out if the rouines from the library
	36	* being used are not cryptographic related :-).
	37	* 4. If you include any Windows specific code (or a derivative thereof) from
	38	* the apps directory (application code) you must include an acknowledgement:
	39	* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
	40	*
	41	* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
	42	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	43	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	44	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	45	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	46	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	47	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	48	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	49	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	50	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	51	* SUCH DAMAGE.
	52	*
	53	* The licence and distribution terms for any publically available version or
	54	* derivative of this code cannot be changed. i.e. this code cannot simply be
	55	* copied and put under another distribution licence
	56	* [including the GNU Public Licence.]
	57	*/
	58
	59	#include <stdio.h>
	60	#include "cryptlib.h"
ec577822 BM	61	#include <openssl/bn.h>
	62	#include <openssl/rsa.h>
	63	#include <openssl/rand.h>
58964a49	64
6b691a5c	65	int RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen,
29c1f061	66	const unsigned char *from, int flen)
58964a49 RE	67	{
	68	int j;
	69	unsigned char *p;
	70
	71	if (flen > (tlen-11))
	72	{
	73	RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_1,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
	74	return(0);
	75	}
	76
	77	p=(unsigned char *)to;
	78
	79	*(p++)=0;
	80	(p++)=1; / Private Key BT (Block Type) */
	81
17ef2916	82	/* pad out with 0xff data */
58964a49 RE	83	j=tlen-3-flen;
	84	memset(p,0xff,j);
	85	p+=j;
	86	*(p++)='\0';
	87	memcpy(p,from,(unsigned int)flen);
	88	return(1);
	89	}
	90
6b691a5c	91	int RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen,
29c1f061	92	const unsigned char *from, int flen, int num)
58964a49 RE	93	{
58964a49 RE	94	int i,j;
29c1f061	95	const unsigned char *p;
58964a49 RE	96
58964a49 RE	97	p=from;
dfeab068	98	if ((num != (flen+1)) \|\| (*(p++) != 01))
58964a49 RE	99	{
	100	RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BLOCK_TYPE_IS_NOT_01);
	101	return(-1);
	102	}
	103
	104	/* scan over padding data */
	105	j=flen-1; /* one for type. */
	106	for (i=0; i<j; i++)
	107	{
	108	if (p != 0xff) / should decrypt to 0xff */
	109	{
	110	if (*p == 0)
	111	{ p++; break; }
	112	else {
	113	RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BAD_FIXED_HEADER_DECRYPT);
	114	return(-1);
	115	}
	116	}
	117	p++;
	118	}
	119
	120	if (i == j)
	121	{
	122	RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_NULL_BEFORE_BLOCK_MISSING);
	123	return(-1);
	124	}
	125
	126	if (i < 8)
	127	{
	128	RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BAD_PAD_BYTE_COUNT);
	129	return(-1);
	130	}
	131	i++; /* Skip over the '\0' */
	132	j-=i;
17ef2916 UM	133	if (j > tlen)
	134	{
	135	RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_DATA_TOO_LARGE);
	136	return(-1);
	137	}
58964a49 RE	138	memcpy(to,p,(unsigned int)j);
	139
	140	return(j);
	141	}
	142
6b691a5c	143	int RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen,
29c1f061	144	const unsigned char *from, int flen)
58964a49 RE	145	{
	146	int i,j;
	147	unsigned char *p;
	148
	149	if (flen > (tlen-11))
	150	{
	151	RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_2,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
	152	return(0);
	153	}
	154
	155	p=(unsigned char *)to;
	156
	157	*(p++)=0;
	158	(p++)=2; / Public Key BT (Block Type) */
	159
	160	/* pad out with non-zero random data */
	161	j=tlen-3-flen;
	162
eb952088 UM	163	if (RAND_bytes(p,j) <= 0)
eb952088 UM	164	return(0);
58964a49 RE	165	for (i=0; i<j; i++)
	166	{
	167	if (*p == '\0')
	168	do {
eb952088 UM	169	if (RAND_bytes(p,1) <= 0)
eb952088 UM	170	return(0);
58964a49 RE	171	} while (*p == '\0');
	172	p++;
	173	}
	174
	175	*(p++)='\0';
	176
	177	memcpy(p,from,(unsigned int)flen);
	178	return(1);
	179	}
	180
6b691a5c	181	int RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen,
29c1f061	182	const unsigned char *from, int flen, int num)
58964a49 RE	183	{
58964a49 RE	184	int i,j;
29c1f061	185	const unsigned char *p;
58964a49 RE	186
58964a49 RE	187	p=from;
dfeab068	188	if ((num != (flen+1)) \|\| (*(p++) != 02))
58964a49 RE	189	{
	190	RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_BLOCK_TYPE_IS_NOT_02);
	191	return(-1);
	192	}
dfeab068 RE	193	#ifdef PKCS1_CHECK
	194	return(num-11);
	195	#endif
58964a49 RE	196
	197	/* scan over padding data */
	198	j=flen-1; /* one for type. */
	199	for (i=0; i<j; i++)
	200	if (*(p++) == 0) break;
	201
	202	if (i == j)
	203	{
	204	RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_NULL_BEFORE_BLOCK_MISSING);
	205	return(-1);
	206	}
	207
	208	if (i < 8)
	209	{
	210	RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_BAD_PAD_BYTE_COUNT);
	211	return(-1);
	212	}
	213	i++; /* Skip over the '\0' */
	214	j-=i;
17ef2916 UM	215	if (j > tlen)
	216	{
	217	RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_DATA_TOO_LARGE);
	218	return(-1);
	219	}
58964a49 RE	220	memcpy(to,p,(unsigned int)j);
	221
	222	return(j);
	223	}
	224