1 /* crypto/rsa/rsa_saos.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 <openssl/bn.h> 62 #include <openssl/rsa.h> 63 #include <openssl/objects.h> 64 #include <openssl/x509.h> 65 66 int RSA_sign_ASN1_OCTET_STRING(int type, 67 const unsigned char *m, unsigned int m_len, 68 unsigned char *sigret, unsigned int *siglen, RSA *rsa) 69 { 70 ASN1_OCTET_STRING sig; 71 int i,j,ret=1; 72 unsigned char *p,*s; 73 74 sig.type=V_ASN1_OCTET_STRING; 75 sig.length=m_len; 76 sig.data=(unsigned char *)m; 77 78 i=i2d_ASN1_OCTET_STRING(&sig,NULL); 79 j=RSA_size(rsa); 80 if (i > (j-RSA_PKCS1_PADDING_SIZE)) 81 { 82 RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY); 83 return(0); 84 } 85 s=(unsigned char *)OPENSSL_malloc((unsigned int)j+1); 86 if (s == NULL) 87 { 88 RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING,ERR_R_MALLOC_FAILURE); 89 return(0); 90 } 91 p=s; 92 i2d_ASN1_OCTET_STRING(&sig,&p); 93 i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING); 94 if (i <= 0) 95 ret=0; 96 else 97 *siglen=i; 98 99 OPENSSL_cleanse(s,(unsigned int)j+1); 100 OPENSSL_free(s); 101 return(ret); 102 } 103 104 int RSA_verify_ASN1_OCTET_STRING(int dtype, 105 const unsigned char *m, 106 unsigned int m_len, unsigned char *sigbuf, unsigned int siglen, 107 RSA *rsa) 108 { 109 int i,ret=0; 110 unsigned char *s; 111 const unsigned char *p; 112 ASN1_OCTET_STRING *sig=NULL; 113 114 if (siglen != (unsigned int)RSA_size(rsa)) 115 { 116 RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,RSA_R_WRONG_SIGNATURE_LENGTH); 117 return(0); 118 } 119 120 s=(unsigned char *)OPENSSL_malloc((unsigned int)siglen); 121 if (s == NULL) 122 { 123 RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,ERR_R_MALLOC_FAILURE); 124 goto err; 125 } 126 i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING); 127 128 if (i <= 0) goto err; 129 130 p=s; 131 sig=d2i_ASN1_OCTET_STRING(NULL,&p,(long)i); 132 if (sig == NULL) goto err; 133 134 if ( ((unsigned int)sig->length != m_len) || 135 (memcmp(m,sig->data,m_len) != 0)) 136 { 137 RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,RSA_R_BAD_SIGNATURE); 138 } 139 else 140 ret=1; 141 err: 142 if (sig != NULL) M_ASN1_OCTET_STRING_free(sig); 143 if (s != NULL) 144 { 145 OPENSSL_cleanse(s,(unsigned int)siglen); 146 OPENSSL_free(s); 147 } 148 return(ret); 149 } 150 151