Update "OAEP reconsidered" comment

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

diff --git a/crypto/rsa/rsa_eay.c b/crypto/rsa/rsa_eay.c
index 8b8a1e279a7e359f8fa263d6cf937046553b4a18..6a68770031d6d651b3903d24a8529ce2eda2715e 100644 (file)
--- a/crypto/rsa/rsa_eay.c
+++ b/crypto/rsa/rsa_eay.c
@@ -65,15 +65,15 @@
 
 #ifndef RSA_NULL
 
-static int RSA_eay_public_encrypt(int flen, unsigned char *from,
+static int RSA_eay_public_encrypt(int flen, const unsigned char *from,
                unsigned char *to, RSA *rsa,int padding);
-static int RSA_eay_private_encrypt(int flen, unsigned char *from,
+static int RSA_eay_private_encrypt(int flen, const unsigned char *from,
                unsigned char *to, RSA *rsa,int padding);
-static int RSA_eay_public_decrypt(int flen, unsigned char *from,
+static int RSA_eay_public_decrypt(int flen, const unsigned char *from,
                unsigned char *to, RSA *rsa,int padding);
-static int RSA_eay_private_decrypt(int flen, unsigned char *from,
+static int RSA_eay_private_decrypt(int flen, const unsigned char *from,
                unsigned char *to, RSA *rsa,int padding);
-static int RSA_eay_mod_exp(BIGNUM *r0, BIGNUM *i, RSA *rsa);
+static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *i, RSA *rsa);
 static int RSA_eay_init(RSA *rsa);
 static int RSA_eay_finish(RSA *rsa);
 static RSA_METHOD rsa_pkcs1_eay_meth={
@@ -83,19 +83,19 @@ static RSA_METHOD rsa_pkcs1_eay_meth={
        RSA_eay_private_encrypt,
        RSA_eay_private_decrypt,
        RSA_eay_mod_exp,
-       BN_mod_exp_mont,
+       BN_mod_exp_mont, /* XXX probably we should not use Montgomery if  e == 3 */
        RSA_eay_init,
        RSA_eay_finish,
        0,
        NULL,
        };
 
-RSA_METHOD *RSA_PKCS1_SSLeay(void)
+const RSA_METHOD *RSA_PKCS1_SSLeay(void)
        {
        return(&rsa_pkcs1_eay_meth);
        }
 
-static int RSA_eay_public_encrypt(int flen, unsigned char *from,
+static int RSA_eay_public_encrypt(int flen, const unsigned char *from,
             unsigned char *to, RSA *rsa, int padding)
        {
        const RSA_METHOD *meth;
@@ -141,11 +141,28 @@ static int RSA_eay_public_encrypt(int flen, unsigned char *from,
        
        if ((rsa->_method_mod_n == NULL) && (rsa->flags & RSA_FLAG_CACHE_PUBLIC))
                {
-               if ((rsa->_method_mod_n=BN_MONT_CTX_new()) != NULL)
-                       if (!BN_MONT_CTX_set(rsa->_method_mod_n,rsa->n,ctx))
-                           goto err;
+               BN_MONT_CTX* bn_mont_ctx;
+               if ((bn_mont_ctx=BN_MONT_CTX_new()) == NULL)
+                       goto err;
+               if (!BN_MONT_CTX_set(bn_mont_ctx,rsa->n,ctx))
+                       {
+                       BN_MONT_CTX_free(bn_mont_ctx);
+                       goto err;
+                       }
+               if (rsa->_method_mod_n == NULL) /* other thread may have finished first */
+                       {
+                       CRYPTO_w_lock(CRYPTO_LOCK_RSA);
+                       if (rsa->_method_mod_n == NULL)
+                               {
+                               rsa->_method_mod_n = bn_mont_ctx;
+                               bn_mont_ctx = NULL;
+                               }
+                       CRYPTO_w_unlock(CRYPTO_LOCK_RSA);
+                       }
+               if (bn_mont_ctx)
+                       BN_MONT_CTX_free(bn_mont_ctx);
                }
-
+               
        if (!meth->bn_mod_exp(&ret,&f,rsa->e,rsa->n,ctx,
                rsa->_method_mod_n)) goto err;
 
@@ -169,7 +186,7 @@ err:
        return(r);
        }
 
-static int RSA_eay_private_encrypt(int flen, unsigned char *from,
+static int RSA_eay_private_encrypt(int flen, const unsigned char *from,
             unsigned char *to, RSA *rsa, int padding)
        {
        const RSA_METHOD *meth;
@@ -247,7 +264,7 @@ err:
        return(r);
        }
 
-static int RSA_eay_private_decrypt(int flen, unsigned char *from,
+static int RSA_eay_private_decrypt(int flen, const unsigned char *from,
             unsigned char *to, RSA *rsa, int padding)
        {
        const RSA_METHOD *meth;
@@ -342,7 +359,7 @@ err:
        return(r);
        }
 
-static int RSA_eay_public_decrypt(int flen, unsigned char *from,
+static int RSA_eay_public_decrypt(int flen, const unsigned char *from,
             unsigned char *to, RSA *rsa, int padding)
        {
        const RSA_METHOD *meth;
@@ -378,11 +395,28 @@ static int RSA_eay_public_decrypt(int flen, unsigned char *from,
        /* do the decrypt */
        if ((rsa->_method_mod_n == NULL) && (rsa->flags & RSA_FLAG_CACHE_PUBLIC))
                {
-               if ((rsa->_method_mod_n=BN_MONT_CTX_new()) != NULL)
-                       if (!BN_MONT_CTX_set(rsa->_method_mod_n,rsa->n,ctx))
-                           goto err;
+               BN_MONT_CTX* bn_mont_ctx;
+               if ((bn_mont_ctx=BN_MONT_CTX_new()) == NULL)
+                       goto err;
+               if (!BN_MONT_CTX_set(bn_mont_ctx,rsa->n,ctx))
+                       {
+                       BN_MONT_CTX_free(bn_mont_ctx);
+                       goto err;
+                       }
+               if (rsa->_method_mod_n == NULL) /* other thread may have finished first */
+                       {
+                       CRYPTO_w_lock(CRYPTO_LOCK_RSA);
+                       if (rsa->_method_mod_n == NULL)
+                               {
+                               rsa->_method_mod_n = bn_mont_ctx;
+                               bn_mont_ctx = NULL;
+                               }
+                       CRYPTO_w_unlock(CRYPTO_LOCK_RSA);
+                       }
+               if (bn_mont_ctx)
+                       BN_MONT_CTX_free(bn_mont_ctx);
                }
-
+               
        if (!meth->bn_mod_exp(&ret,&f,rsa->e,rsa->n,ctx,
                rsa->_method_mod_n)) goto err;
 
@@ -416,7 +450,7 @@ err:
        return(r);
        }
 
-static int RSA_eay_mod_exp(BIGNUM *r0, BIGNUM *I, RSA *rsa)
+static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa)
        {
        const RSA_METHOD *meth;
        BIGNUM r1,m1;
@@ -432,20 +466,53 @@ static int RSA_eay_mod_exp(BIGNUM *r0, BIGNUM *I, RSA *rsa)
                {
                if (rsa->_method_mod_p == NULL)
                        {
-                       if ((rsa->_method_mod_p=BN_MONT_CTX_new()) != NULL)
-                               if (!BN_MONT_CTX_set(rsa->_method_mod_p,rsa->p,
-                                                    ctx))
-                                       goto err;
+                       BN_MONT_CTX* bn_mont_ctx;
+                       if ((bn_mont_ctx=BN_MONT_CTX_new()) == NULL)
+                               goto err;
+                       if (!BN_MONT_CTX_set(bn_mont_ctx,rsa->p,ctx))
+                               {
+                               BN_MONT_CTX_free(bn_mont_ctx);
+                               goto err;
+                               }
+                       if (rsa->_method_mod_p == NULL) /* other thread may have finished first */
+                               {
+                               CRYPTO_w_lock(CRYPTO_LOCK_RSA);
+                               if (rsa->_method_mod_p == NULL)
+                                       {
+                                       rsa->_method_mod_p = bn_mont_ctx;
+                                       bn_mont_ctx = NULL;
+                                       }
+                               CRYPTO_w_unlock(CRYPTO_LOCK_RSA);
+                               }
+                       if (bn_mont_ctx)
+                               BN_MONT_CTX_free(bn_mont_ctx);
                        }
+
                if (rsa->_method_mod_q == NULL)
                        {
-                       if ((rsa->_method_mod_q=BN_MONT_CTX_new()) != NULL)
-                               if (!BN_MONT_CTX_set(rsa->_method_mod_q,rsa->q,
-                                                    ctx))
-                                       goto err;
+                       BN_MONT_CTX* bn_mont_ctx;
+                       if ((bn_mont_ctx=BN_MONT_CTX_new()) == NULL)
+                               goto err;
+                       if (!BN_MONT_CTX_set(bn_mont_ctx,rsa->q,ctx))
+                               {
+                               BN_MONT_CTX_free(bn_mont_ctx);
+                               goto err;
+                               }
+                       if (rsa->_method_mod_q == NULL) /* other thread may have finished first */
+                               {
+                               CRYPTO_w_lock(CRYPTO_LOCK_RSA);
+                               if (rsa->_method_mod_q == NULL)
+                                       {
+                                       rsa->_method_mod_q = bn_mont_ctx;
+                                       bn_mont_ctx = NULL;
+                                       }
+                               CRYPTO_w_unlock(CRYPTO_LOCK_RSA);
+                               }
+                       if (bn_mont_ctx)
+                               BN_MONT_CTX_free(bn_mont_ctx);
                        }
                }
-
+               
        if (!BN_mod(&r1,I,rsa->q,ctx)) goto err;
        if (!meth->bn_mod_exp(&m1,&r1,rsa->dmq1,rsa->q,ctx,
                rsa->_method_mod_q)) goto err;