[PATCH 4/5] crypto/octeontx2: fix output field for RSA verify

[Ramkumar Balu <rbalu@marvell.com>]

From: Ramkumar <rbalu@marvell.com>

During RSA sign verification, the OCTEONTX2 PMD returns the decrypted
plaintext in 'sign' field of rte_crypto_rsa_op_param. The 'sign'
field is actually used to pass input to the operation. This PMD
overwrites the 'sign' field buffer. This is non-compliance to lib
cryptodev.

This patch fixes the PMD to use 'cipher' field to return the decrypted
plaintext during RSA verify operation.

Fixes: 04227377c81b ("crypto/octeontx2: support asymmetric in enqueue/dequeue")
Cc: stable@dpdk.org

Signed-off-by: Ramkumar <rbalu@marvell.com>
---
 drivers/crypto/octeontx2/otx2_cryptodev_ops.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/crypto/octeontx2/otx2_cryptodev_ops.c b/drivers/crypto/octeontx2/otx2_cryptodev_ops.c
index 339b82f33e..fb38e309aa 100644
--- a/drivers/crypto/octeontx2/otx2_cryptodev_ops.c
+++ b/drivers/crypto/octeontx2/otx2_cryptodev_ops.c
@@ -876,20 +876,22 @@ otx2_cpt_asym_rsa_op(struct rte_crypto_op *cop, struct cpt_request_info *req,
 		break;
 	case RTE_CRYPTO_ASYM_OP_VERIFY:
 		if (rsa->pad == RTE_CRYPTO_RSA_PADDING_NONE) {
-			rsa->sign.length = rsa_ctx->n.length;
-			memcpy(rsa->sign.data, req->rptr, rsa->sign.length);
+			rsa->cipher.length = rsa_ctx->n.length;
 		} else {
 			/* Get length of signed output */
-			rsa->sign.length = rte_cpu_to_be_16
+			rsa->cipher.length = rte_cpu_to_be_16
 					  (*((uint16_t *)req->rptr));
 			/*
 			 * Offset output data pointer by length field
-			 * (2 bytes) and copy signed data.
+			 * (2 bytes).
 			 */
-			memcpy(rsa->sign.data, req->rptr + 2,
-			       rsa->sign.length);
+			req->rptr += 2;
 		}
-		if (memcmp(rsa->sign.data, rsa->message.data,
+
+		if (rsa->cipher.data != NULL)
+			memcpy(rsa->cipher.data, req->rptr, rsa->cipher.length);
+
+		if (memcmp(req->rptr, rsa->message.data,
 			   rsa->message.length)) {
 			CPT_LOG_DP_ERR("RSA verification failed");
 			cop->status = RTE_CRYPTO_OP_STATUS_ERROR;
-- 
2.17.1