X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Frsa%2Frsa_sign.c;h=8946e19c1740198c3bab8b0fe5f12d9322c40a02;hp=009fba199e3dea6e4a0f94baea4045c7609813fa;hb=2039c421b0e5b75ffcf6a88e39cc09089b4303dc;hpb=bc36ee6227517edae802bcb0da68d4f04fe1fb5e diff --git a/crypto/rsa/rsa_sign.c b/crypto/rsa/rsa_sign.c index 009fba199e..8946e19c17 100644 --- a/crypto/rsa/rsa_sign.c +++ b/crypto/rsa/rsa_sign.c @@ -1,226 +1,226 @@ -/* crypto/rsa/rsa_sign.c */ -/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) - * All rights reserved. +/* + * Copyright 1995-2016 The OpenSSL Project Authors. 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.] + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html */ #include -#include "cryptlib.h" +#include "internal/cryptlib.h" #include #include #include #include -#include +#include "internal/x509_int.h" +#include "rsa_locl.h" /* Size of an SSL signature: MD5+SHA1 */ -#define SSL_SIG_LENGTH 36 +#define SSL_SIG_LENGTH 36 int RSA_sign(int type, const unsigned char *m, unsigned int m_len, - unsigned char *sigret, unsigned int *siglen, RSA *rsa) - { - X509_SIG sig; - ASN1_TYPE parameter; - int i,j,ret=1; - unsigned char *p, *tmps = NULL; - const unsigned char *s = NULL; - X509_ALGOR algor; - ASN1_OCTET_STRING digest; - if(rsa->flags & RSA_FLAG_SIGN_VER) - return ENGINE_get_RSA(rsa->engine)->rsa_sign(type, - m, m_len, sigret, siglen, rsa); - /* Special case: SSL signature, just check the length */ - if(type == NID_md5_sha1) { - if(m_len != SSL_SIG_LENGTH) { - RSAerr(RSA_F_RSA_SIGN,RSA_R_INVALID_MESSAGE_LENGTH); - return(0); - } - i = SSL_SIG_LENGTH; - s = m; - } else { - sig.algor= &algor; - sig.algor->algorithm=OBJ_nid2obj(type); - if (sig.algor->algorithm == NULL) - { - RSAerr(RSA_F_RSA_SIGN,RSA_R_UNKNOWN_ALGORITHM_TYPE); - return(0); - } - if (sig.algor->algorithm->length == 0) - { - RSAerr(RSA_F_RSA_SIGN,RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD); - return(0); - } - parameter.type=V_ASN1_NULL; - parameter.value.ptr=NULL; - sig.algor->parameter= ¶meter; - - sig.digest= &digest; - sig.digest->data=(unsigned char *)m; /* TMP UGLY CAST */ - sig.digest->length=m_len; - - i=i2d_X509_SIG(&sig,NULL); - } - j=RSA_size(rsa); - if ((i-RSA_PKCS1_PADDING) > j) - { - RSAerr(RSA_F_RSA_SIGN,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY); - return(0); - } - if(type != NID_md5_sha1) { - tmps=(unsigned char *)OPENSSL_malloc((unsigned int)j+1); - if (tmps == NULL) - { - RSAerr(RSA_F_RSA_SIGN,ERR_R_MALLOC_FAILURE); - return(0); - } - p=tmps; - i2d_X509_SIG(&sig,&p); - s=tmps; - } - i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING); - if (i <= 0) - ret=0; - else - *siglen=i; - - if(type != NID_md5_sha1) { - memset(tmps,0,(unsigned int)j+1); - OPENSSL_free(tmps); - } - return(ret); - } + unsigned char *sigret, unsigned int *siglen, RSA *rsa) +{ + X509_SIG sig; + ASN1_TYPE parameter; + int i, j, ret = 1; + unsigned char *p, *tmps = NULL; + const unsigned char *s = NULL; + X509_ALGOR algor; + ASN1_OCTET_STRING digest; + if (rsa->meth->rsa_sign) { + return rsa->meth->rsa_sign(type, m, m_len, sigret, siglen, rsa); + } + /* Special case: SSL signature, just check the length */ + if (type == NID_md5_sha1) { + if (m_len != SSL_SIG_LENGTH) { + RSAerr(RSA_F_RSA_SIGN, RSA_R_INVALID_MESSAGE_LENGTH); + return (0); + } + i = SSL_SIG_LENGTH; + s = m; + } else { + sig.algor = &algor; + sig.algor->algorithm = OBJ_nid2obj(type); + if (sig.algor->algorithm == NULL) { + RSAerr(RSA_F_RSA_SIGN, RSA_R_UNKNOWN_ALGORITHM_TYPE); + return (0); + } + if (OBJ_length(sig.algor->algorithm) == 0) { + RSAerr(RSA_F_RSA_SIGN, + RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD); + return (0); + } + parameter.type = V_ASN1_NULL; + parameter.value.ptr = NULL; + sig.algor->parameter = ¶meter; + + sig.digest = &digest; + sig.digest->data = (unsigned char *)m; /* TMP UGLY CAST */ + sig.digest->length = m_len; + + i = i2d_X509_SIG(&sig, NULL); + } + j = RSA_size(rsa); + if (i > (j - RSA_PKCS1_PADDING_SIZE)) { + RSAerr(RSA_F_RSA_SIGN, RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY); + return (0); + } + if (type != NID_md5_sha1) { + tmps = OPENSSL_malloc((unsigned int)j + 1); + if (tmps == NULL) { + RSAerr(RSA_F_RSA_SIGN, ERR_R_MALLOC_FAILURE); + return (0); + } + p = tmps; + i2d_X509_SIG(&sig, &p); + s = tmps; + } + i = RSA_private_encrypt(i, s, sigret, rsa, RSA_PKCS1_PADDING); + if (i <= 0) + ret = 0; + else + *siglen = i; + + if (type != NID_md5_sha1) + OPENSSL_clear_free(tmps, (unsigned int)j + 1); + return (ret); +} + +/* + * Check DigestInfo structure does not contain extraneous data by reencoding + * using DER and checking encoding against original. + */ +static int rsa_check_digestinfo(X509_SIG *sig, const unsigned char *dinfo, + int dinfolen) +{ + unsigned char *der = NULL; + int derlen; + int ret = 0; + derlen = i2d_X509_SIG(sig, &der); + if (derlen <= 0) + return 0; + if (derlen == dinfolen && !memcmp(dinfo, der, derlen)) + ret = 1; + OPENSSL_clear_free(der, derlen); + return ret; +} + +int int_rsa_verify(int dtype, const unsigned char *m, + unsigned int m_len, + unsigned char *rm, size_t *prm_len, + const unsigned char *sigbuf, size_t siglen, RSA *rsa) +{ + int i, ret = 0, sigtype; + unsigned char *s; + X509_SIG *sig = NULL; + + if (siglen != (unsigned int)RSA_size(rsa)) { + RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_WRONG_SIGNATURE_LENGTH); + return (0); + } + + if ((dtype == NID_md5_sha1) && rm) { + i = RSA_public_decrypt((int)siglen, + sigbuf, rm, rsa, RSA_PKCS1_PADDING); + if (i <= 0) + return 0; + *prm_len = i; + return 1; + } + + s = OPENSSL_malloc((unsigned int)siglen); + if (s == NULL) { + RSAerr(RSA_F_INT_RSA_VERIFY, ERR_R_MALLOC_FAILURE); + goto err; + } + if ((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH)) { + RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_INVALID_MESSAGE_LENGTH); + goto err; + } + i = RSA_public_decrypt((int)siglen, sigbuf, s, rsa, RSA_PKCS1_PADDING); + + if (i <= 0) + goto err; + /* + * Oddball MDC2 case: signature can be OCTET STRING. check for correct + * tag and length octets. + */ + if (dtype == NID_mdc2 && i == 18 && s[0] == 0x04 && s[1] == 0x10) { + if (rm) { + memcpy(rm, s + 2, 16); + *prm_len = 16; + ret = 1; + } else if (memcmp(m, s + 2, 16)) { + RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE); + } else { + ret = 1; + } + } else if (dtype == NID_md5_sha1) { + /* Special case: SSL signature */ + if ((i != SSL_SIG_LENGTH) || memcmp(s, m, SSL_SIG_LENGTH)) + RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE); + else + ret = 1; + } else { + const unsigned char *p = s; + sig = d2i_X509_SIG(NULL, &p, (long)i); + + if (sig == NULL) + goto err; + + /* Excess data can be used to create forgeries */ + if (p != s + i || !rsa_check_digestinfo(sig, s, i)) { + RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE); + goto err; + } + + /* + * Parameters to the signature algorithm can also be used to create + * forgeries + */ + if (sig->algor->parameter + && ASN1_TYPE_get(sig->algor->parameter) != V_ASN1_NULL) { + RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE); + goto err; + } + + sigtype = OBJ_obj2nid(sig->algor->algorithm); + + if (sigtype != dtype) { + RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_ALGORITHM_MISMATCH); + goto err; + } + if (rm) { + const EVP_MD *md; + md = EVP_get_digestbynid(dtype); + if (md && (EVP_MD_size(md) != sig->digest->length)) + RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_INVALID_DIGEST_LENGTH); + else { + memcpy(rm, sig->digest->data, sig->digest->length); + *prm_len = sig->digest->length; + ret = 1; + } + } else if (((unsigned int)sig->digest->length != m_len) || + (memcmp(m, sig->digest->data, m_len) != 0)) { + RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE); + } else + ret = 1; + } + err: + X509_SIG_free(sig); + OPENSSL_clear_free(s, (unsigned int)siglen); + return (ret); +} int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len, - unsigned char *sigbuf, unsigned int siglen, RSA *rsa) - { - int i,ret=0,sigtype; - unsigned char *p,*s; - X509_SIG *sig=NULL; - - if (siglen != (unsigned int)RSA_size(rsa)) - { - RSAerr(RSA_F_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH); - return(0); - } - - if(rsa->flags & RSA_FLAG_SIGN_VER) - return ENGINE_get_RSA(rsa->engine)->rsa_verify(dtype, - m, m_len, sigbuf, siglen, rsa); - - s=(unsigned char *)OPENSSL_malloc((unsigned int)siglen); - if (s == NULL) - { - RSAerr(RSA_F_RSA_VERIFY,ERR_R_MALLOC_FAILURE); - goto err; - } - if((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH) ) { - RSAerr(RSA_F_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH); - return(0); - } - i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING); - - if (i <= 0) goto err; - - /* Special case: SSL signature */ - if(dtype == NID_md5_sha1) { - if((i != SSL_SIG_LENGTH) || memcmp(s, m, SSL_SIG_LENGTH)) - RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE); - else ret = 1; - } else { - p=s; - sig=d2i_X509_SIG(NULL,&p,(long)i); - - if (sig == NULL) goto err; - sigtype=OBJ_obj2nid(sig->algor->algorithm); - - - #ifdef RSA_DEBUG - /* put a backward compatibility flag in EAY */ - fprintf(stderr,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype), - OBJ_nid2ln(dtype)); - #endif - if (sigtype != dtype) - { - if (((dtype == NID_md5) && - (sigtype == NID_md5WithRSAEncryption)) || - ((dtype == NID_md2) && - (sigtype == NID_md2WithRSAEncryption))) - { - /* ok, we will let it through */ -#if !defined(OPENSSL_NO_STDIO) && !defined(OPENSSL_SYS_WIN16) - fprintf(stderr,"signature has problems, re-make with post SSLeay045\n"); -#endif - } - else - { - RSAerr(RSA_F_RSA_VERIFY, - RSA_R_ALGORITHM_MISMATCH); - goto err; - } - } - if ( ((unsigned int)sig->digest->length != m_len) || - (memcmp(m,sig->digest->data,m_len) != 0)) - { - RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE); - } - else - ret=1; - } -err: - if (sig != NULL) X509_SIG_free(sig); - memset(s,0,(unsigned int)siglen); - OPENSSL_free(s); - return(ret); - } + const unsigned char *sigbuf, unsigned int siglen, RSA *rsa) +{ + + if (rsa->meth->rsa_verify) { + return rsa->meth->rsa_verify(dtype, m, m_len, sigbuf, siglen, rsa); + } + return int_rsa_verify(dtype, m, m_len, NULL, NULL, sigbuf, siglen, rsa); +}