[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 "bn.h"
#include "rsa.h"
#include "rand.h"

#ifndef NOPROTO
int RSA_padding_add_PKCS1_type_1();
int RSA_padding_check_PKCS1_type_1();
int RSA_padding_add_PKCS1_type_2();
int RSA_padding_check_PKCS1_type_2();
int RSA_padding_add_SSLv23();
int RSA_padding_check_SSLv23();
int RSA_padding_add_none();
int RSA_padding_check_none();

#endif

int RSA_padding_add_PKCS1_type_1(to,tlen,from,flen)
unsigned char *to;
int tlen;
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) */

	/* padd 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(to,tlen,from,flen,num)
unsigned char *to;
int tlen;
unsigned char *from;
int flen;
int num;
	{
	int i,j;
	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;
	memcpy(to,p,(unsigned int)j);

	return(j);
	}

int RSA_padding_add_PKCS1_type_2(to,tlen,from,flen)
unsigned char *to;
int tlen;
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;

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

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

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

int RSA_padding_check_PKCS1_type_2(to,tlen,from,flen,num)
unsigned char *to;
int tlen;
unsigned char *from;
int flen;
int num;
	{
	int i,j;
	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;
	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"
	61	#include "bn.h"
	62	#include "rsa.h"
	63	#include "rand.h"
	64
65	#ifndef NOPROTO
66	int RSA_padding_add_PKCS1_type_1();
67	int RSA_padding_check_PKCS1_type_1();
68	int RSA_padding_add_PKCS1_type_2();
69	int RSA_padding_check_PKCS1_type_2();
70	int RSA_padding_add_SSLv23();
71	int RSA_padding_check_SSLv23();
72	int RSA_padding_add_none();
73	int RSA_padding_check_none();
74
75	#endif
76
77	int RSA_padding_add_PKCS1_type_1(to,tlen,from,flen)
78	unsigned char *to;
79	int tlen;
80	unsigned char *from;
81	int flen;
82	{
83	int j;
84	unsigned char *p;
85
86	if (flen > (tlen-11))
87	{
88	RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_1,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
89	return(0);
90	}
91
92	p=(unsigned char *)to;
93
94	*(p++)=0;
95	(p++)=1; / Private Key BT (Block Type) */
96
97	/* padd out with 0xff data */
98	j=tlen-3-flen;
99	memset(p,0xff,j);
100	p+=j;
101	*(p++)='\0';
102	memcpy(p,from,(unsigned int)flen);
103	return(1);
104	}
105
dfeab068	106	int RSA_padding_check_PKCS1_type_1(to,tlen,from,flen,num)
58964a49 RE	107	unsigned char *to;
	108	int tlen;
	109	unsigned char *from;
	110	int flen;
dfeab068	111	int num;
58964a49 RE	112	{
	113	int i,j;
	114	unsigned char *p;
	115
	116	p=from;
dfeab068	117	if ((num != (flen+1)) \|\| (*(p++) != 01))
58964a49 RE	118	{
	119	RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BLOCK_TYPE_IS_NOT_01);
	120	return(-1);
	121	}
	122
	123	/* scan over padding data */
	124	j=flen-1; /* one for type. */
	125	for (i=0; i<j; i++)
	126	{
	127	if (p != 0xff) / should decrypt to 0xff */
	128	{
	129	if (*p == 0)
	130	{ p++; break; }
	131	else {
	132	RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BAD_FIXED_HEADER_DECRYPT);
	133	return(-1);
	134	}
	135	}
	136	p++;
	137	}
	138
	139	if (i == j)
	140	{
	141	RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_NULL_BEFORE_BLOCK_MISSING);
	142	return(-1);
	143	}
	144
	145	if (i < 8)
	146	{
	147	RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BAD_PAD_BYTE_COUNT);
	148	return(-1);
	149	}
	150	i++; /* Skip over the '\0' */
	151	j-=i;
	152	memcpy(to,p,(unsigned int)j);
	153
	154	return(j);
	155	}
	156
	157	int RSA_padding_add_PKCS1_type_2(to,tlen,from,flen)
	158	unsigned char *to;
	159	int tlen;
	160	unsigned char *from;
	161	int flen;
	162	{
	163	int i,j;
	164	unsigned char *p;
	165
	166	if (flen > (tlen-11))
	167	{
	168	RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_2,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
	169	return(0);
	170	}
	171
	172	p=(unsigned char *)to;
	173
	174	*(p++)=0;
	175	(p++)=2; / Public Key BT (Block Type) */
	176
	177	/* pad out with non-zero random data */
	178	j=tlen-3-flen;
	179
	180	RAND_bytes(p,j);
	181	for (i=0; i<j; i++)
182	{
183	if (*p == '\0')
184	do {
185	RAND_bytes(p,1);
186	} while (*p == '\0');
187	p++;
188	}
189
190	*(p++)='\0';
191
192	memcpy(p,from,(unsigned int)flen);
193	return(1);
194	}
195
dfeab068	196	int RSA_padding_check_PKCS1_type_2(to,tlen,from,flen,num)
58964a49 RE	197	unsigned char *to;
	198	int tlen;
	199	unsigned char *from;
	200	int flen;
dfeab068	201	int num;
58964a49 RE	202	{
	203	int i,j;
	204	unsigned char *p;
	205
	206	p=from;
dfeab068	207	if ((num != (flen+1)) \|\| (*(p++) != 02))
58964a49 RE	208	{
	209	RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_BLOCK_TYPE_IS_NOT_02);
	210	return(-1);
	211	}
dfeab068 RE	212	#ifdef PKCS1_CHECK
	213	return(num-11);
	214	#endif
58964a49 RE	215
	216	/* scan over padding data */
	217	j=flen-1; /* one for type. */
	218	for (i=0; i<j; i++)
	219	if (*(p++) == 0) break;
	220
	221	if (i == j)
	222	{
	223	RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_NULL_BEFORE_BLOCK_MISSING);
	224	return(-1);
	225	}
	226
	227	if (i < 8)
	228	{
	229	RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_BAD_PAD_BYTE_COUNT);
	230	return(-1);
	231	}
	232	i++; /* Skip over the '\0' */
	233	j-=i;
	234	memcpy(to,p,(unsigned int)j);
	235
	236	return(j);
	237	}
	238