crypto/openssl: fix RSA verify operation

In lib cryptodev, RSA verify operation inputs plain message text and
corresponding signature and expected to return
RTE_CRYPTO_OP_STATUS_SUCCESS/FAILURE on a signature match/mismatch.
Current OpenSSL PMD RSA verify implementation overrides application passed
sign input by decrypted output which isn't expected.

This patch addresses this issue in OpenSSL PMD. Now, OpenSSL PMD use
tmp buffer to pass to OpenSSL sign API and memcmp output with
original plain text to verify signature match.
Set op->status = RTE_CRYPTO_OP_STATUS_ERROR on signature mismatch.

Fixes: 3e9d6bd447fb ("crypto/openssl: add RSA and mod asym operations")
Cc: stable@dpdk.org
Signed-off-by: Ayuj Verma <ayuj.verma@caviumnetworks.com>
Signed-off-by: Akash Saxena <akash.saxena@caviumnetworks.com>
Signed-off-by: Shally Verma <shally.verma@caviumnetworks.com>
Acked-by: Akhil Goyal <akhil.goyal@nxp.com>

diff --git a/drivers/crypto/openssl/rte_openssl_pmd.c b/drivers/crypto/openssl/rte_openssl_pmd.c
index 003116d..11ea0d1 100644 (file)
--- a/drivers/crypto/openssl/rte_openssl_pmd.c
+++ b/drivers/crypto/openssl/rte_openssl_pmd.c
@@ -1843,6 +1843,9 @@ process_openssl_rsa_op(struct rte_crypto_op *cop,
        struct rte_crypto_asym_op *op = cop->asym;
        RSA *rsa = sess->u.r.rsa;
        uint32_t pad = (op->rsa.pad);
+       uint8_t *tmp;
+
+       cop->status = RTE_CRYPTO_OP_STATUS_SUCCESS;
 
        switch (pad) {
        case RTE_CRYPTO_RSA_PKCS1_V1_5_BT0:
@@ -1895,9 +1898,15 @@ process_openssl_rsa_op(struct rte_crypto_op *cop,
                break;
 
        case RTE_CRYPTO_ASYM_OP_VERIFY:
+               tmp = rte_malloc(NULL, op->rsa.sign.length, 0);
+               if (tmp == NULL) {
+                       OPENSSL_LOG(ERR, "Memory allocation failed");
+                       cop->status = RTE_CRYPTO_OP_STATUS_ERROR;
+                       break;
+               }
                ret = RSA_public_decrypt(op->rsa.sign.length,
                                op->rsa.sign.data,
-                               op->rsa.sign.data,
+                               tmp,
                                rsa,
                                pad);
 
@@ -1905,13 +1914,12 @@ process_openssl_rsa_op(struct rte_crypto_op *cop,
                                "Length of public_decrypt %d "
                                "length of message %zd\n",
                                ret, op->rsa.message.length);
-
-               if (memcmp(op->rsa.sign.data, op->rsa.message.data,
-                                       op->rsa.message.length)) {
-                       OPENSSL_LOG(ERR,
-                                       "RSA sign Verification failed");
-                       return -1;
+               if ((ret <= 0) || (memcmp(tmp, op->rsa.message.data,
+                               op->rsa.message.length))) {
+                       OPENSSL_LOG(ERR, "RSA sign Verification failed");
+                       cop->status = RTE_CRYPTO_OP_STATUS_ERROR;
                }
+               rte_free(tmp);
                break;
 
        default: