1 /* $OpenBSD: rsa_saos.c,v 1.24 2018/09/05 00:55:33 djm Exp $ */ 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 <string.h> 61 62 #include <openssl/bn.h> 63 #include <openssl/err.h> 64 #include <openssl/objects.h> 65 #include <openssl/rsa.h> 66 #include <openssl/x509.h> 67 68 int 69 RSA_sign_ASN1_OCTET_STRING(int type, const unsigned char *m, unsigned int m_len, 70 unsigned char *sigret, unsigned int *siglen, RSA *rsa) 71 { 72 ASN1_OCTET_STRING sig; 73 int i, j, ret = 1; 74 unsigned char *p, *s; 75 76 sig.type = V_ASN1_OCTET_STRING; 77 sig.length = m_len; 78 sig.data = (unsigned char *)m; 79 80 i = i2d_ASN1_OCTET_STRING(&sig, NULL); 81 j = RSA_size(rsa); 82 if (i > (j - RSA_PKCS1_PADDING_SIZE)) { 83 RSAerror(RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY); 84 return 0; 85 } 86 s = malloc(j + 1); 87 if (s == NULL) { 88 RSAerror(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 freezero(s, (unsigned int)j + 1); 100 return ret; 101 } 102 103 int 104 RSA_verify_ASN1_OCTET_STRING(int dtype, const unsigned char *m, 105 unsigned int m_len, unsigned char *sigbuf, unsigned int siglen, RSA *rsa) 106 { 107 int i, ret = 0; 108 unsigned char *s; 109 const unsigned char *p; 110 ASN1_OCTET_STRING *sig = NULL; 111 112 if (siglen != (unsigned int)RSA_size(rsa)) { 113 RSAerror(RSA_R_WRONG_SIGNATURE_LENGTH); 114 return 0; 115 } 116 117 s = malloc(siglen); 118 if (s == NULL) { 119 RSAerror(ERR_R_MALLOC_FAILURE); 120 goto err; 121 } 122 i = RSA_public_decrypt((int)siglen, sigbuf, s, rsa, RSA_PKCS1_PADDING); 123 124 if (i <= 0) 125 goto err; 126 127 p = s; 128 sig = d2i_ASN1_OCTET_STRING(NULL, &p, (long)i); 129 if (sig == NULL) 130 goto err; 131 132 if ((unsigned int)sig->length != m_len || 133 timingsafe_bcmp(m, sig->data, m_len) != 0) { 134 RSAerror(RSA_R_BAD_SIGNATURE); 135 } else 136 ret = 1; 137 err: 138 ASN1_OCTET_STRING_free(sig); 139 freezero(s, (unsigned int)siglen); 140 return ret; 141 } 142