- if (pad_len) {
- padding = rte_pktmbuf_append(m, pad_len);
- if (unlikely(!padding))
- return -1;
+ if (cparams->do_hash && cparams->hash_verify)
+ data_len -= cparams->digest_length;
+
+ if (cparams->do_cipher) {
+ /*
+ * Following algorithms are block cipher algorithms,
+ * and might need padding
+ */
+ switch (cparams->cipher_algo) {
+ case RTE_CRYPTO_CIPHER_AES_CBC:
+ case RTE_CRYPTO_CIPHER_AES_ECB:
+ case RTE_CRYPTO_CIPHER_3DES_CBC:
+ case RTE_CRYPTO_CIPHER_3DES_ECB:
+ if (data_len % cparams->block_size)
+ pad_len = cparams->block_size -
+ (data_len % cparams->block_size);
+ break;
+ default:
+ pad_len = 0;
+ }
+
+ if (pad_len) {
+ padding = rte_pktmbuf_append(m, pad_len);
+ if (unlikely(!padding))
+ return -1;