[PATCH] crypto/cnxk: refactor rsa verification

[Sucharitha Sarananaga]

This patch avoid copying the decrypted message into
the signature buffer, which is actually an input to the
verify operation. This prevents overwriting the input
buffer unnecessarily.

Fixes: 6661bedf1605 ("crypto/cnxk: add asymmetric datapath")

Signed-off-by: Sucharitha Sarananaga <ssarananaga at marvell.com>
---
 drivers/crypto/cnxk/cnxk_ae.h | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/crypto/cnxk/cnxk_ae.h b/drivers/crypto/cnxk/cnxk_ae.h
index cd66f66e70..26a8f4544d 100644
--- a/drivers/crypto/cnxk/cnxk_ae.h
+++ b/drivers/crypto/cnxk/cnxk_ae.h
@@ -1583,20 +1583,18 @@ cnxk_ae_dequeue_rsa_op(struct rte_crypto_op *cop, uint8_t *rptr,
 	case RTE_CRYPTO_ASYM_OP_VERIFY:
 		if (rsa_ctx->padding.type == RTE_CRYPTO_RSA_PADDING_NONE) {
 			rsa->sign.length = rsa_ctx->n.length;
-			memcpy(rsa->sign.data, rptr, rsa->sign.length);
+			if (memcmp(rptr, rsa->message.data, rsa->message.length))
+				cop->status = RTE_CRYPTO_OP_STATUS_ERROR;
 		} else {
 			/* Get length of signed output */
 			rsa->sign.length =
 				rte_cpu_to_be_16(*((uint16_t *)rptr));
 			/*
 			 * Offset output data pointer by length field
-			 * (2 bytes) and copy signed data.
+			 * (2 bytes) and compare signed data.
 			 */
-			memcpy(rsa->sign.data, rptr + 2, rsa->sign.length);
-		}
-		if (memcmp(rsa->sign.data, rsa->message.data,
-			   rsa->message.length)) {
-			cop->status = RTE_CRYPTO_OP_STATUS_ERROR;
+			if (memcmp(rptr + 2, rsa->message.data, rsa->message.length))
+				cop->status = RTE_CRYPTO_OP_STATUS_ERROR;
 		}
 		break;
 	default:
-- 
2.49.0