diff options
Diffstat (limited to 'openssl/crypto/rsa/rsa_sign.c')
| -rw-r--r-- | openssl/crypto/rsa/rsa_sign.c | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/openssl/crypto/rsa/rsa_sign.c b/openssl/crypto/rsa/rsa_sign.c new file mode 100644 index 000000000..5488c06f6 --- /dev/null +++ b/openssl/crypto/rsa/rsa_sign.c @@ -0,0 +1,269 @@ +/* crypto/rsa/rsa_sign.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/objects.h> +#include <openssl/x509.h> + +/* Size of an SSL signature: MD5+SHA1 */ +#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) && 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 { + /* NB: in FIPS mode block anything that isn't a TLS signature */ +#ifdef OPENSSL_FIPS + if(FIPS_mode() && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) + { + RSAerr(RSA_F_RSA_SIGN, RSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE); + return 0; + } +#endif + 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 > (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=(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) { + OPENSSL_cleanse(tmps,(unsigned int)j+1); + OPENSSL_free(tmps); + } + 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 *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) && rsa->meth->rsa_verify) + { + return rsa->meth->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) + { + if (m_len != SSL_SIG_LENGTH) + { + RSAerr(RSA_F_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH); + goto err; + } + } + /* NB: in FIPS mode block anything that isn't a TLS signature */ +#ifdef OPENSSL_FIPS + else if(FIPS_mode() && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) + { + RSAerr(RSA_F_RSA_VERIFY, RSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE); + return 0; + } +#endif + 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 { + 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) + { + RSAerr(RSA_F_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_RSA_VERIFY,RSA_R_BAD_SIGNATURE); + 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); + if (s != NULL) + { + OPENSSL_cleanse(s,(unsigned int)siglen); + OPENSSL_free(s); + } + return(ret); + } + |