- 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=(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;
- }
-
- /* Special case: SSL signature */
- if(dtype == NID_md5_sha1) {
- 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)
- {
- if (((dtype == NID_md5) &&
- (sigtype == NID_md5WithRSAEncryption)) ||
- ((dtype == NID_md2) &&
- (sigtype == NID_md2WithRSAEncryption)))
- {
- /* ok, we will let it through */
-#if !defined(OPENSSL_NO_STDIO)
- fprintf(stderr,"signature has problems, re-make with post SSLeay045\n");
-#endif
- }
- else
- {
- 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);
- }
+ 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);
+}