diff --git a/drivers/crypto/ipsec_mb/pmd_aesni_mb.c b/drivers/crypto/ipsec_mb/pmd_aesni_mb.c
index b93267f1c3..80ced1e4fe 100644
--- a/drivers/crypto/ipsec_mb/pmd_aesni_mb.c
+++ b/drivers/crypto/ipsec_mb/pmd_aesni_mb.c
@@ -13,49 +13,6 @@ struct aesni_mb_op_buf_data {
 	uint32_t offset;
 };
 
-/**
- * Calculate the authentication pre-computes
- *
- * @param one_block_hash	Function pointer
- *				to calculate digest on ipad/opad
- * @param ipad			Inner pad output byte array
- * @param opad			Outer pad output byte array
- * @param hkey			Authentication key
- * @param hkey_len		Authentication key length
- * @param blocksize		Block size of selected hash algo
- */
-static void
-calculate_auth_precomputes(hash_one_block_t one_block_hash,
-		uint8_t *ipad, uint8_t *opad,
-		const uint8_t *hkey, uint16_t hkey_len,
-		uint16_t blocksize)
-{
-	uint32_t i, length;
-
-	uint8_t ipad_buf[blocksize] __rte_aligned(16);
-	uint8_t opad_buf[blocksize] __rte_aligned(16);
-
-	/* Setup inner and outer pads */
-	memset(ipad_buf, HMAC_IPAD_VALUE, blocksize);
-	memset(opad_buf, HMAC_OPAD_VALUE, blocksize);
-
-	/* XOR hash key with inner and outer pads */
-	length = hkey_len > blocksize ? blocksize : hkey_len;
-
-	for (i = 0; i < length; i++) {
-		ipad_buf[i] ^= hkey[i];
-		opad_buf[i] ^= hkey[i];
-	}
-
-	/* Compute partial hashes */
-	(*one_block_hash)(ipad_buf, ipad);
-	(*one_block_hash)(opad_buf, opad);
-
-	/* Clean up stack */
-	memset(ipad_buf, 0, blocksize);
-	memset(opad_buf, 0, blocksize);
-}
-
 static inline int
 is_aead_algo(IMB_HASH_ALG hash_alg, IMB_CIPHER_MODE cipher_mode)
 {
@@ -66,12 +23,10 @@ is_aead_algo(IMB_HASH_ALG hash_alg, IMB_CIPHER_MODE cipher_mode)
 
 /** Set session authentication parameters */
 static int
-aesni_mb_set_session_auth_parameters(const IMB_MGR *mb_mgr,
+aesni_mb_set_session_auth_parameters(IMB_MGR *mb_mgr,
 		struct aesni_mb_session *sess,
 		const struct rte_crypto_sym_xform *xform)
 {
-	hash_one_block_t hash_oneblock_fn = NULL;
-	unsigned int key_larger_block_size = 0;
 	uint8_t hashed_key[HMAC_MAX_BLOCK_SIZE] = { 0 };
 	uint32_t auth_precompute = 1;
 
@@ -263,18 +218,15 @@ aesni_mb_set_session_auth_parameters(const IMB_MGR *mb_mgr,
 	switch (xform->auth.algo) {
 	case RTE_CRYPTO_AUTH_MD5_HMAC:
 		sess->template_job.hash_alg = IMB_AUTH_MD5;
-		hash_oneblock_fn = mb_mgr->md5_one_block;
 		break;
 	case RTE_CRYPTO_AUTH_SHA1_HMAC:
 		sess->template_job.hash_alg = IMB_AUTH_HMAC_SHA_1;
-		hash_oneblock_fn = mb_mgr->sha1_one_block;
 		if (xform->auth.key.length > get_auth_algo_blocksize(
 				IMB_AUTH_HMAC_SHA_1)) {
 			IMB_SHA1(mb_mgr,
 				xform->auth.key.data,
 				xform->auth.key.length,
 				hashed_key);
-			key_larger_block_size = 1;
 		}
 		break;
 	case RTE_CRYPTO_AUTH_SHA1:
@@ -283,14 +235,12 @@ aesni_mb_set_session_auth_parameters(const IMB_MGR *mb_mgr,
 		break;
 	case RTE_CRYPTO_AUTH_SHA224_HMAC:
 		sess->template_job.hash_alg = IMB_AUTH_HMAC_SHA_224;
-		hash_oneblock_fn = mb_mgr->sha224_one_block;
 		if (xform->auth.key.length > get_auth_algo_blocksize(
 				IMB_AUTH_HMAC_SHA_224)) {
 			IMB_SHA224(mb_mgr,
 				xform->auth.key.data,
 				xform->auth.key.length,
 				hashed_key);
-			key_larger_block_size = 1;
 		}
 		break;
 	case RTE_CRYPTO_AUTH_SHA224:
@@ -299,14 +249,12 @@ aesni_mb_set_session_auth_parameters(const IMB_MGR *mb_mgr,
 		break;
 	case RTE_CRYPTO_AUTH_SHA256_HMAC:
 		sess->template_job.hash_alg = IMB_AUTH_HMAC_SHA_256;
-		hash_oneblock_fn = mb_mgr->sha256_one_block;
 		if (xform->auth.key.length > get_auth_algo_blocksize(
 				IMB_AUTH_HMAC_SHA_256)) {
 			IMB_SHA256(mb_mgr,
 				xform->auth.key.data,
 				xform->auth.key.length,
 				hashed_key);
-			key_larger_block_size = 1;
 		}
 		break;
 	case RTE_CRYPTO_AUTH_SHA256:
@@ -315,14 +263,12 @@ aesni_mb_set_session_auth_parameters(const IMB_MGR *mb_mgr,
 		break;
 	case RTE_CRYPTO_AUTH_SHA384_HMAC:
 		sess->template_job.hash_alg = IMB_AUTH_HMAC_SHA_384;
-		hash_oneblock_fn = mb_mgr->sha384_one_block;
 		if (xform->auth.key.length > get_auth_algo_blocksize(
 				IMB_AUTH_HMAC_SHA_384)) {
 			IMB_SHA384(mb_mgr,
 				xform->auth.key.data,
 				xform->auth.key.length,
 				hashed_key);
-			key_larger_block_size = 1;
 		}
 		break;
 	case RTE_CRYPTO_AUTH_SHA384:
@@ -331,14 +277,12 @@ aesni_mb_set_session_auth_parameters(const IMB_MGR *mb_mgr,
 		break;
 	case RTE_CRYPTO_AUTH_SHA512_HMAC:
 		sess->template_job.hash_alg = IMB_AUTH_HMAC_SHA_512;
-		hash_oneblock_fn = mb_mgr->sha512_one_block;
 		if (xform->auth.key.length > get_auth_algo_blocksize(
 				IMB_AUTH_HMAC_SHA_512)) {
 			IMB_SHA512(mb_mgr,
 				xform->auth.key.data,
 				xform->auth.key.length,
 				hashed_key);
-			key_larger_block_size = 1;
 		}
 		break;
 	case RTE_CRYPTO_AUTH_SHA512:
@@ -372,19 +316,10 @@ aesni_mb_set_session_auth_parameters(const IMB_MGR *mb_mgr,
 		return 0;
 
 	/* Calculate Authentication precomputes */
-	if (key_larger_block_size) {
-		calculate_auth_precomputes(hash_oneblock_fn,
-			sess->auth.pads.inner, sess->auth.pads.outer,
-			hashed_key,
-			xform->auth.key.length,
-			get_auth_algo_blocksize(sess->template_job.hash_alg));
-	} else {
-		calculate_auth_precomputes(hash_oneblock_fn,
-			sess->auth.pads.inner, sess->auth.pads.outer,
-			xform->auth.key.data,
-			xform->auth.key.length,
-			get_auth_algo_blocksize(sess->template_job.hash_alg));
-	}
+	imb_hmac_ipad_opad(mb_mgr, sess->template_job.hash_alg,
+		xform->auth.key.data, xform->auth.key.length,
+		sess->auth.pads.inner, sess->auth.pads.outer);
+
 	sess->template_job.u.HMAC._hashed_auth_key_xor_ipad =
 		sess->auth.pads.inner;
 	sess->template_job.u.HMAC._hashed_auth_key_xor_opad =
