diff --git a/sys/crypto/aesni/aesni.c b/sys/crypto/aesni/aesni.c
--- a/sys/crypto/aesni/aesni.c
+++ b/sys/crypto/aesni/aesni.c
@@ -1,7 +1,7 @@
 /*-
  * Copyright (c) 2005-2008 Pawel Jakub Dawidek <pjd@FreeBSD.org>
  * Copyright (c) 2010 Konstantin Belousov <kib@FreeBSD.org>
- * Copyright (c) 2014 The FreeBSD Foundation
+ * Copyright (c) 2014-2021 The FreeBSD Foundation
  * Copyright (c) 2017 Conrad Meyer <cem@FreeBSD.org>
  * All rights reserved.
  *
@@ -9,6 +9,9 @@
  * under sponsorship of the FreeBSD Foundation and
  * Rubicon Communications, LLC (Netgate).
  *
+ * Portions of this software were developed by Ararat River
+ * Consulting, LLC under sponsorship of the FreeBSD Foundation.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -319,8 +322,7 @@
 			if (csp->csp_auth_mlen != 0 &&
 			    csp->csp_auth_mlen != AES_CBC_MAC_HASH_LEN)
 				return (EINVAL);
-			if (csp->csp_ivlen != AES_CCM_IV_LEN ||
-			    !sc->has_aes)
+			if (!sc->has_aes)
 				return (EINVAL);
 			break;
 		default:
@@ -639,9 +641,12 @@
 
 	csp = crypto_get_params(crp->crp_session);
 	switch (csp->csp_cipher_alg) {
+	case CRYPTO_AES_CCM_16:
+		if (crp->crp_payload_length > ccm_max_payload_length(csp))
+			return (EMSGSIZE);
+		/* FALLTHROUGH */
 	case CRYPTO_AES_ICM:
 	case CRYPTO_AES_NIST_GCM_16:
-	case CRYPTO_AES_CCM_16:
 		if ((crp->crp_flags & CRYPTO_F_IV_SEPARATE) == 0)
 			return (EINVAL);
 		break;
diff --git a/sys/crypto/aesni/aesni_ccm.c b/sys/crypto/aesni/aesni_ccm.c
--- a/sys/crypto/aesni/aesni_ccm.c
+++ b/sys/crypto/aesni/aesni_ccm.c
@@ -1,11 +1,15 @@
 /*-
- * Copyright (c) 2014 The FreeBSD Foundation
+ * Copyright (c) 2014-2021 The FreeBSD Foundation
  * Copyright (c) 2018 iXsystems, Inc
  * All rights reserved.
  *
- * This software was developed by John-Mark Gurney under
- * the sponsorship of the FreeBSD Foundation and
+ * Portions of this software were developed by John-Mark Gurney
+ * under the sponsorship of the FreeBSD Foundation and
  * Rubicon Communications, LLC (Netgate).
+ *
+ * Portions of this software were developed by Ararat River
+ * Consulting, LLC under sponsorship of the FreeBSD Foundation.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -185,12 +189,7 @@
  * however, they're always truncated from 16 bytes, and the tag
  * length isn't passed in.  (This could be fixed by changing the
  * code in aesni.c:aesni_cipher_crypt().)
- * Similarly, although the nonce length is passed in, the
- * OpenCrypto API that calls us doesn't have a way to set the nonce
- * other than by having different crypto algorithm types.  As a result,
- * this is currently always called with nlen=12; this means that we
- * also have a maximum message length of 16 megabytes.  And similarly,
- * since abytes is limited to a 32 bit value here, the AAD is
+ * Since abytes is limited to a 32 bit value here, the AAD is
  * limited to 4 gigabytes or less.
  */
 void
@@ -222,14 +221,6 @@
 	 */
 	L = sizeof(__m128i) - 1 - nlen;
 
-	/*
-	 * Now, this shouldn't happen, but let's make sure that
-	 * the data length isn't too big.
-	 */
-	KASSERT(nbytes <= ((1 << (8 * L)) - 1),
-	    ("%s: nbytes is %u, but length field is %d bytes",
-		__FUNCTION__, nbytes, L));
-
 	/*
 	 * Clear out the blocks
 	 */
@@ -399,13 +390,6 @@
 	 */
 	L = sizeof(__m128i) - 1 - nlen;
 
-	/*
-	 * Now, this shouldn't happen, but let's make sure that
-	 * the data length isn't too big.
-	 */
-	if (nbytes > ((1 << (8 * L)) - 1))
-		panic("%s: nbytes is %u, but length field is %d bytes",
-		      __FUNCTION__, nbytes, L);
 	/*
 	 * Clear out the blocks
 	 */