diff options
Diffstat (limited to 'openssl/crypto/rsa/rsa_pk1.c')
| -rw-r--r-- | openssl/crypto/rsa/rsa_pk1.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/openssl/crypto/rsa/rsa_pk1.c b/openssl/crypto/rsa/rsa_pk1.c new file mode 100644 index 00000000..8560755f --- /dev/null +++ b/openssl/crypto/rsa/rsa_pk1.c @@ -0,0 +1,224 @@ +/* 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-RSA_PKCS1_PADDING_SIZE)) + { + 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); + } + |