Re: [dpdk-dev] [PATCH v1 1/2] crypto/openssl: changes for RSA verify operation

[Akhil Goyal <akhil.goyal@nxp.com>]

On 10/11/2018 7:13 PM, Akash Saxena wrote:
> Add tmp buffer to pass to OpenSSL sign API and memcmp output with
> original plain text to verify signature match.
> Set op->status = RTE_CRYPO_OP_STATUS_ERROR on signature mismatch.
>
> 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>
> ---
>   drivers/crypto/openssl/rte_openssl_pmd.c | 20 +++++++++++++-------
>   1 file changed, 13 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/crypto/openssl/rte_openssl_pmd.c b/drivers/crypto/openssl/rte_openssl_pmd.c
> index 003116d..cc33fca 100644
> --- 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 +1898,10 @@ 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);
>   		ret = RSA_public_decrypt(op->rsa.sign.length,
>   				op->rsa.sign.data,
> -				op->rsa.sign.data,
> +				tmp,
>   				rsa,
>   				pad);
Null checking of tmp is not done if rte_malloc fails. Please correct it.
>   
> @@ -1905,13 +1909,15 @@ 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) {
> +			if (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: