Fix another possible crash in rsa_ossl_mod_exp.

[openssl.git] / crypto / rsa / rsa_ossl.c

diff --git a/crypto/rsa/rsa_ossl.c b/crypto/rsa/rsa_ossl.c
index 782606645bd1b4b4a504e5dbc58ffeb8da85f274..92c4be1868a5b1608c1ab7841281014c1a51a692 100644 (file)
--- a/crypto/rsa/rsa_ossl.c
+++ b/crypto/rsa/rsa_ossl.c
@@ -11,8 +11,6 @@
 #include "internal/bn_int.h"
 #include "rsa_locl.h"
 
-#ifndef RSA_NULL
-
 static int rsa_ossl_public_encrypt(int flen, const unsigned char *from,
                                   unsigned char *to, RSA *rsa, int padding);
 static int rsa_ossl_private_encrypt(int flen, const unsigned char *from,
@@ -26,7 +24,7 @@ static int rsa_ossl_mod_exp(BIGNUM *r0, const BIGNUM *i, RSA *rsa,
 static int rsa_ossl_init(RSA *rsa);
 static int rsa_ossl_finish(RSA *rsa);
 static RSA_METHOD rsa_pkcs1_ossl_meth = {
-    "OpenSSL PKCS#1 RSA (from Eric Young)",
+    "OpenSSL PKCS#1 RSA",
     rsa_ossl_public_encrypt,
     rsa_ossl_public_decrypt,     /* signature verification */
     rsa_ossl_private_encrypt,    /* signing */
@@ -43,11 +41,28 @@ static RSA_METHOD rsa_pkcs1_ossl_meth = {
     NULL                        /* rsa_keygen */
 };
 
+static const RSA_METHOD *default_RSA_meth = &rsa_pkcs1_ossl_meth;
+
+void RSA_set_default_method(const RSA_METHOD *meth)
+{
+    default_RSA_meth = meth;
+}
+
+const RSA_METHOD *RSA_get_default_method(void)
+{
+    return default_RSA_meth;
+}
+
 const RSA_METHOD *RSA_PKCS1_OpenSSL(void)
 {
     return &rsa_pkcs1_ossl_meth;
 }
 
+const RSA_METHOD *RSA_null_method(void)
+{
+    return NULL;
+}
+
 static int rsa_ossl_public_encrypt(int flen, const unsigned char *from,
                                   unsigned char *to, RSA *rsa, int padding)
 {
@@ -593,6 +608,8 @@ static int rsa_ossl_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx)
     r1 = BN_CTX_get(ctx);
     m1 = BN_CTX_get(ctx);
     vrfy = BN_CTX_get(ctx);
+    if (vrfy == NULL)
+        goto err;
 
     {
         BIGNUM *p = BN_new(), *q = BN_new();
@@ -786,5 +803,3 @@ static int rsa_ossl_finish(RSA *rsa)
     BN_MONT_CTX_free(rsa->_method_mod_q);
     return (1);
 }
-
-#endif