-/* 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:
* 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
+ * 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
* 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
*/
#include <stdio.h>
-#include "cryptlib.h"
-#include "bn.h"
-#include "rsa.h"
-#include "objects.h"
-#include "x509.h"
-
-int RSA_sign(type,m,m_len,sigret,siglen,rsa)
-int type;
-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,*s;
- X509_ALGOR algor;
- ASN1_OCTET_STRING digest;
-
- 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=m;
- 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);
- }
- s=(unsigned char *)Malloc((unsigned int)j+1);
- if (s == NULL)
- {
- RSAerr(RSA_F_RSA_SIGN,ERR_R_MALLOC_FAILURE);
- return(0);
- }
- p=s;
- i2d_X509_SIG(&sig,&p);
- i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING);
- if (i <= 0)
- ret=0;
- else
- *siglen=i;
-
- memset(s,0,(unsigned int)j+1);
- Free(s);
- return(ret);
- }
-
-int RSA_verify(dtype, m, m_len, sigbuf, siglen, rsa)
-int dtype;
-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);
- }
-
- s=(unsigned char *)Malloc((unsigned int)siglen);
- if (s == NULL)
- {
- RSAerr(RSA_F_RSA_VERIFY,ERR_R_MALLOC_FAILURE);
- goto err;
- }
- i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING);
-
- if (i <= 0) goto err;
-
- 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 compatability 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(NO_STDIO) && !defined(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);
- Free(s);
- return(ret);
- }
+#include "internal/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
+
+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->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,
+ 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);
+}
projects / openssl.git / blobdiff