226 lines
6.8 KiB
C
226 lines
6.8 KiB
C
/*
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* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/bn.h>
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#include <openssl/rsa.h>
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#include <openssl/objects.h>
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#include <openssl/x509.h>
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#include "internal/x509_int.h"
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#include "rsa_locl.h"
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/* Size of an SSL signature: MD5+SHA1 */
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#define SSL_SIG_LENGTH 36
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int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
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unsigned char *sigret, unsigned int *siglen, RSA *rsa)
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{
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X509_SIG sig;
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ASN1_TYPE parameter;
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int i, j, ret = 1;
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unsigned char *p, *tmps = NULL;
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const unsigned char *s = NULL;
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X509_ALGOR algor;
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ASN1_OCTET_STRING digest;
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if (rsa->meth->rsa_sign) {
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return rsa->meth->rsa_sign(type, m, m_len, sigret, siglen, rsa);
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}
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/* Special case: SSL signature, just check the length */
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if (type == NID_md5_sha1) {
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if (m_len != SSL_SIG_LENGTH) {
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RSAerr(RSA_F_RSA_SIGN, RSA_R_INVALID_MESSAGE_LENGTH);
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return (0);
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}
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i = SSL_SIG_LENGTH;
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s = m;
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} else {
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sig.algor = &algor;
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sig.algor->algorithm = OBJ_nid2obj(type);
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if (sig.algor->algorithm == NULL) {
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RSAerr(RSA_F_RSA_SIGN, RSA_R_UNKNOWN_ALGORITHM_TYPE);
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return (0);
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}
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if (OBJ_length(sig.algor->algorithm) == 0) {
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RSAerr(RSA_F_RSA_SIGN,
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RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
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return (0);
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}
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parameter.type = V_ASN1_NULL;
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parameter.value.ptr = NULL;
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sig.algor->parameter = ¶meter;
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sig.digest = &digest;
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sig.digest->data = (unsigned char *)m; /* TMP UGLY CAST */
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sig.digest->length = m_len;
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i = i2d_X509_SIG(&sig, NULL);
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}
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j = RSA_size(rsa);
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if (i > (j - RSA_PKCS1_PADDING_SIZE)) {
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RSAerr(RSA_F_RSA_SIGN, RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
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return (0);
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}
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if (type != NID_md5_sha1) {
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tmps = OPENSSL_malloc((unsigned int)j + 1);
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if (tmps == NULL) {
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RSAerr(RSA_F_RSA_SIGN, ERR_R_MALLOC_FAILURE);
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return (0);
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}
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p = tmps;
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i2d_X509_SIG(&sig, &p);
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s = tmps;
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}
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i = RSA_private_encrypt(i, s, sigret, rsa, RSA_PKCS1_PADDING);
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if (i <= 0)
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ret = 0;
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else
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*siglen = i;
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if (type != NID_md5_sha1)
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OPENSSL_clear_free(tmps, (unsigned int)j + 1);
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return (ret);
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}
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/*
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* Check DigestInfo structure does not contain extraneous data by reencoding
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* using DER and checking encoding against original.
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*/
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static int rsa_check_digestinfo(X509_SIG *sig, const unsigned char *dinfo,
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int dinfolen)
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{
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unsigned char *der = NULL;
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int derlen;
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int ret = 0;
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derlen = i2d_X509_SIG(sig, &der);
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if (derlen <= 0)
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return 0;
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if (derlen == dinfolen && !memcmp(dinfo, der, derlen))
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ret = 1;
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OPENSSL_clear_free(der, derlen);
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return ret;
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}
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int int_rsa_verify(int dtype, const unsigned char *m,
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unsigned int m_len,
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unsigned char *rm, size_t *prm_len,
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const unsigned char *sigbuf, size_t siglen, RSA *rsa)
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{
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int i, ret = 0, sigtype;
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unsigned char *s;
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X509_SIG *sig = NULL;
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if (siglen != (unsigned int)RSA_size(rsa)) {
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RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_WRONG_SIGNATURE_LENGTH);
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return (0);
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}
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if ((dtype == NID_md5_sha1) && rm) {
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i = RSA_public_decrypt((int)siglen,
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sigbuf, rm, rsa, RSA_PKCS1_PADDING);
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if (i <= 0)
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return 0;
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*prm_len = i;
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return 1;
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}
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s = OPENSSL_malloc((unsigned int)siglen);
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if (s == NULL) {
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RSAerr(RSA_F_INT_RSA_VERIFY, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if ((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH)) {
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RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_INVALID_MESSAGE_LENGTH);
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goto err;
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}
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i = RSA_public_decrypt((int)siglen, sigbuf, s, rsa, RSA_PKCS1_PADDING);
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if (i <= 0)
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goto err;
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/*
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* Oddball MDC2 case: signature can be OCTET STRING. check for correct
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* tag and length octets.
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*/
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if (dtype == NID_mdc2 && i == 18 && s[0] == 0x04 && s[1] == 0x10) {
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if (rm) {
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memcpy(rm, s + 2, 16);
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*prm_len = 16;
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ret = 1;
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} else if (memcmp(m, s + 2, 16)) {
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RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
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} else {
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ret = 1;
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}
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} else if (dtype == NID_md5_sha1) {
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/* Special case: SSL signature */
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if ((i != SSL_SIG_LENGTH) || memcmp(s, m, SSL_SIG_LENGTH))
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RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
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else
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ret = 1;
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} else {
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const unsigned char *p = s;
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sig = d2i_X509_SIG(NULL, &p, (long)i);
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if (sig == NULL)
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goto err;
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/* Excess data can be used to create forgeries */
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if (p != s + i || !rsa_check_digestinfo(sig, s, i)) {
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RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
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goto err;
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}
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/*
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* Parameters to the signature algorithm can also be used to create
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* forgeries
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*/
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if (sig->algor->parameter
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&& ASN1_TYPE_get(sig->algor->parameter) != V_ASN1_NULL) {
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RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
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goto err;
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}
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sigtype = OBJ_obj2nid(sig->algor->algorithm);
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if (sigtype != dtype) {
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RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_ALGORITHM_MISMATCH);
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goto err;
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}
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if (rm) {
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const EVP_MD *md;
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md = EVP_get_digestbynid(dtype);
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if (md && (EVP_MD_size(md) != sig->digest->length))
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RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_INVALID_DIGEST_LENGTH);
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else {
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memcpy(rm, sig->digest->data, sig->digest->length);
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*prm_len = sig->digest->length;
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ret = 1;
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}
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} else if (((unsigned int)sig->digest->length != m_len) ||
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(memcmp(m, sig->digest->data, m_len) != 0)) {
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RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
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} else
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ret = 1;
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}
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err:
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X509_SIG_free(sig);
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OPENSSL_clear_free(s, (unsigned int)siglen);
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return (ret);
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}
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int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
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const unsigned char *sigbuf, unsigned int siglen, RSA *rsa)
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{
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if (rsa->meth->rsa_verify) {
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return rsa->meth->rsa_verify(dtype, m, m_len, sigbuf, siglen, rsa);
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}
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return int_rsa_verify(dtype, m, m_len, NULL, NULL, sigbuf, siglen, rsa);
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}
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