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Diffstat (limited to 'openssl/crypto/rsa/rsa_sign.c')
| -rw-r--r-- | openssl/crypto/rsa/rsa_sign.c | 301 |
1 files changed, 301 insertions, 0 deletions
diff --git a/openssl/crypto/rsa/rsa_sign.c b/openssl/crypto/rsa/rsa_sign.c new file mode 100644 index 0000000..82ca832 --- /dev/null +++ b/openssl/crypto/rsa/rsa_sign.c @@ -0,0 +1,301 @@ +/* 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> +#include "rsa_locl.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; +#ifdef OPENSSL_FIPS + if (FIPS_mode() && !(rsa->meth->flags & RSA_FLAG_FIPS_METHOD) + && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) { + RSAerr(RSA_F_RSA_SIGN, RSA_R_NON_FIPS_RSA_METHOD); + return 0; + } +#endif + 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 { + 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); +} + +/* + * 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_cleanse(der, derlen); + OPENSSL_free(der); + 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; + +#ifdef OPENSSL_FIPS + if (FIPS_mode() && !(rsa->meth->flags & RSA_FLAG_FIPS_METHOD) + && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) { + RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_NON_FIPS_RSA_METHOD); + return 0; + } +#endif + + 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 = (unsigned char *)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); + +#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) { + 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: + if (sig != NULL) + X509_SIG_free(sig); + if (s != NULL) { + OPENSSL_cleanse(s, (unsigned int)siglen); + OPENSSL_free(s); + } + return (ret); +} + +int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len, + const unsigned char *sigbuf, unsigned int siglen, RSA *rsa) +{ + + if ((rsa->flags & RSA_FLAG_SIGN_VER) && 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); +} |