Re: [dpdk-users] AES "Digest-encrypted" crypto chain case.

["Dybkowski, AdamX" <adamx.dybkowski@intel.com>]

Hi Naveen.

Regarding your message sent to dpdk-users mailing list:
https://mails.dpdk.org/archives/users/2019-September/004382.html

We've tested here at Intel the digest-encrypted combination you wrote about, with auth.algo = AES-CMAC and cipher.algo = AES-CTR, and it seems everything works fine.
Do you set the length fields properly when creating the operation? According to the header file rte_crypto_sym.h, in the structure rte_crypto_sym_op, the field cipher.data.length should be written in bits for the SNOW 3G, KASUMI and ZUC ciphers, and in bytes for other.

Have a look what the header file says:

uint32_t length;
/**< The message length, in bytes, of the
  * source buffer on which the cryptographic
  * operation will be computed.
  * This must be a multiple of the block size
  * if a block cipher is being used. This is
  * also the same as the result length.
  *
  * @note
  * For SNOW 3G @ RTE_CRYPTO_AUTH_SNOW3G_UEA2,
  * KASUMI @ RTE_CRYPTO_CIPHER_KASUMI_F8
  * and ZUC @ RTE_CRYPTO_CIPHER_ZUC_EEA3,
  * this field should be in bits.
  */

This also gets built into the documentation available here:
https://doc.dpdk.org/api-19.08/structrte__crypto__sym__op.html#aebb70c2aab3407a9f05334c47131a43b

Maybe that's why SNOW3G and ZUC were working for you, while AES-CTR did not?
The same applies to the offset field and to digest.data.offset and digest.data.length fields.

Please verify in your code how you set these all offset and length fields and check if you write the number of bits or the number of bytes in them.

Adam