diff options
Diffstat (limited to 'Cryptlib/OpenSSL/crypto/rsa/rsa_sign.c')
| -rw-r--r-- | Cryptlib/OpenSSL/crypto/rsa/rsa_sign.c | 413 |
1 files changed, 233 insertions, 180 deletions
diff --git a/Cryptlib/OpenSSL/crypto/rsa/rsa_sign.c b/Cryptlib/OpenSSL/crypto/rsa/rsa_sign.c index 952d24fb..82ca8324 100644 --- a/Cryptlib/OpenSSL/crypto/rsa/rsa_sign.c +++ b/Cryptlib/OpenSSL/crypto/rsa/rsa_sign.c @@ -1,248 +1,301 @@ -/* - * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. +/* 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. * - * 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 + * 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 "internal/cryptlib.h" +#include "cryptlib.h" #include <openssl/bn.h> #include <openssl/rsa.h> #include <openssl/objects.h> #include <openssl/x509.h> -#include "internal/x509_int.h" #include "rsa_locl.h" /* Size of an SSL signature: MD5+SHA1 */ #define SSL_SIG_LENGTH 36 -/* - * encode_pkcs1 encodes a DigestInfo prefix of hash |type| and digest |m|, as - * described in EMSA-PKCS1-v1_5-ENCODE, RFC 3447 section 9.2 step 2. This - * encodes the DigestInfo (T and tLen) but does not add the padding. - * - * On success, it returns one and sets |*out| to a newly allocated buffer - * containing the result and |*out_len| to its length. The caller must free - * |*out| with |OPENSSL_free|. Otherwise, it returns zero. - */ -static int encode_pkcs1(unsigned char **out, int *out_len, int type, - const unsigned char *m, unsigned int m_len) +int RSA_sign(int type, const unsigned char *m, unsigned int m_len, + unsigned char *sigret, unsigned int *siglen, RSA *rsa) { X509_SIG sig; - X509_ALGOR algor; 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; - uint8_t *der = NULL; - int len; - - sig.algor = &algor; - sig.algor->algorithm = OBJ_nid2obj(type); - if (sig.algor->algorithm == NULL) { - RSAerr(RSA_F_ENCODE_PKCS1, RSA_R_UNKNOWN_ALGORITHM_TYPE); - return 0; - } - if (OBJ_length(sig.algor->algorithm) == 0) { - RSAerr(RSA_F_ENCODE_PKCS1, - RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD); +#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; } - parameter.type = V_ASN1_NULL; - parameter.value.ptr = NULL; - sig.algor->parameter = ¶meter; - - sig.digest = &digest; - sig.digest->data = (unsigned char *)m; - sig.digest->length = m_len; - - len = i2d_X509_SIG(&sig, &der); - if (len < 0) - return 0; - - *out = der; - *out_len = len; - return 1; -} - -int RSA_sign(int type, const unsigned char *m, unsigned int m_len, - unsigned char *sigret, unsigned int *siglen, RSA *rsa) -{ - int encrypt_len, encoded_len = 0, ret = 0; - unsigned char *tmps = NULL; - const unsigned char *encoded = NULL; - - if (rsa->meth->rsa_sign) { +#endif + if ((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_sign) { return rsa->meth->rsa_sign(type, m, m_len, sigret, siglen, rsa); } - - /* Compute the encoded digest. */ + /* Special case: SSL signature, just check the length */ if (type == NID_md5_sha1) { - /* - * NID_md5_sha1 corresponds to the MD5/SHA1 combination in TLS 1.1 and - * earlier. It has no DigestInfo wrapper but otherwise is - * RSASSA-PKCS1-v1_5. - */ if (m_len != SSL_SIG_LENGTH) { RSAerr(RSA_F_RSA_SIGN, RSA_R_INVALID_MESSAGE_LENGTH); - return 0; + return (0); } - encoded_len = SSL_SIG_LENGTH; - encoded = m; + i = SSL_SIG_LENGTH; + s = m; } else { - if (!encode_pkcs1(&tmps, &encoded_len, type, m, m_len)) - goto err; - encoded = tmps; - } + 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; - if (encoded_len > RSA_size(rsa) - RSA_PKCS1_PADDING_SIZE) { + 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); - goto err; + return (0); } - encrypt_len = RSA_private_encrypt(encoded_len, encoded, sigret, rsa, - RSA_PKCS1_PADDING); - if (encrypt_len <= 0) - goto err; - - *siglen = encrypt_len; - ret = 1; + 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; -err: - OPENSSL_clear_free(tmps, (size_t)encoded_len); - return ret; + if (type != NID_md5_sha1) { + OPENSSL_cleanse(tmps, (unsigned int)j + 1); + OPENSSL_free(tmps); + } + return (ret); } /* - * int_rsa_verify verifies an RSA signature in |sigbuf| using |rsa|. It may be - * called in two modes. If |rm| is NULL, it verifies the signature for digest - * |m|. Otherwise, it recovers the digest from the signature, writing the digest - * to |rm| and the length to |*prm_len|. |type| is the NID of the digest - * algorithm to use. It returns one on successful verification and zero - * otherwise. + * Check DigestInfo structure does not contain extraneous data by reencoding + * using DER and checking encoding against original. */ -int int_rsa_verify(int type, const unsigned char *m, unsigned int m_len, +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 decrypt_len, ret = 0, encoded_len = 0; - unsigned char *decrypt_buf = NULL, *encoded = NULL; + int i, ret = 0, sigtype; + unsigned char *s; + X509_SIG *sig = NULL; - if (siglen != (size_t)RSA_size(rsa)) { - RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_WRONG_SIGNATURE_LENGTH); +#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 - /* Recover the encoded digest. */ - decrypt_buf = OPENSSL_malloc(siglen); - if (decrypt_buf == 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 = (unsigned char *)OPENSSL_malloc((unsigned int)siglen); + if (s == NULL) { RSAerr(RSA_F_INT_RSA_VERIFY, ERR_R_MALLOC_FAILURE); goto err; } - - decrypt_len = RSA_public_decrypt((int)siglen, sigbuf, decrypt_buf, rsa, - RSA_PKCS1_PADDING); - if (decrypt_len <= 0) + 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 (type == NID_md5_sha1) { - /* - * NID_md5_sha1 corresponds to the MD5/SHA1 combination in TLS 1.1 and - * earlier. It has no DigestInfo wrapper but otherwise is - * RSASSA-PKCS1-v1_5. - */ - if (decrypt_len != SSL_SIG_LENGTH) { - RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE); - goto err; - } - - if (rm != NULL) { - memcpy(rm, decrypt_buf, SSL_SIG_LENGTH); - *prm_len = SSL_SIG_LENGTH; - } else { - if (m_len != SSL_SIG_LENGTH) { - RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_INVALID_MESSAGE_LENGTH); - goto err; - } - - if (memcmp(decrypt_buf, m, SSL_SIG_LENGTH) != 0) { - RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE); - goto err; - } - } - } else if (type == NID_mdc2 && decrypt_len == 2 + 16 - && decrypt_buf[0] == 0x04 && decrypt_buf[1] == 0x10) { - /* - * Oddball MDC2 case: signature can be OCTET STRING. check for correct - * tag and length octets. - */ - if (rm != NULL) { - memcpy(rm, decrypt_buf + 2, 16); + 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 { - if (m_len != 16) { - RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_INVALID_MESSAGE_LENGTH); - goto err; - } - - if (memcmp(m, decrypt_buf + 2, 16) != 0) { - RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE); - goto err; - } + 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 { - /* - * If recovering the digest, extract a digest-sized output from the end - * of |decrypt_buf| for |encode_pkcs1|, then compare the decryption - * output as in a standard verification. - */ - if (rm != NULL) { - const EVP_MD *md = EVP_get_digestbynid(type); - if (md == NULL) { - RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_UNKNOWN_ALGORITHM_TYPE); - goto err; - } - - m_len = EVP_MD_size(md); - if (m_len > (size_t)decrypt_len) { - RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_INVALID_DIGEST_LENGTH); - goto err; - } - m = decrypt_buf + decrypt_len - m_len; - } + const unsigned char *p = s; + sig = d2i_X509_SIG(NULL, &p, (long)i); - /* Construct the encoded digest and ensure it matches. */ - if (!encode_pkcs1(&encoded, &encoded_len, type, m, m_len)) + if (sig == NULL) goto err; - if (encoded_len != decrypt_len - || memcmp(encoded, decrypt_buf, encoded_len) != 0) { + /* 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; } - /* Output the recovered digest. */ - if (rm != NULL) { - memcpy(rm, m, m_len); - *prm_len = m_len; + /* + * 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; } - } - ret = 1; + sigtype = OBJ_obj2nid(sig->algor->algorithm); -err: - OPENSSL_clear_free(encoded, (size_t)encoded_len); - OPENSSL_clear_free(decrypt_buf, siglen); - return ret; +#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 type, const unsigned char *m, unsigned int m_len, +int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len, const unsigned char *sigbuf, unsigned int siglen, RSA *rsa) { - if (rsa->meth->rsa_verify) { - return rsa->meth->rsa_verify(type, m, m_len, sigbuf, siglen, 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(type, m, m_len, NULL, NULL, sigbuf, siglen, rsa); + return int_rsa_verify(dtype, m, m_len, NULL, NULL, sigbuf, siglen, rsa); } |