diff --git a/library/ssl_msg.c b/library/ssl_msg.c
index c9f75de..2353c5e 100644
--- a/library/ssl_msg.c
+++ b/library/ssl_msg.c
@@ -522,7 +522,9 @@
                              int (*f_rng)(void *, unsigned char *, size_t),
                              void *p_rng )
 {
+#if !defined(MBEDTLS_USE_PSA_CRYPTO)
     mbedtls_cipher_mode_t mode;
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
     int auth_done = 0;
     unsigned char * data;
     unsigned char add_data[13 + 1 + MBEDTLS_SSL_CID_OUT_LEN_MAX ];
@@ -568,7 +570,9 @@
     MBEDTLS_SSL_DEBUG_BUF( 4, "before encrypt: output payload",
                            data, rec->data_len );
 
+#if !defined(MBEDTLS_USE_PSA_CRYPTO)
     mode = mbedtls_cipher_get_cipher_mode( &transform->cipher_ctx_enc );
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
 
     if( rec->data_len > MBEDTLS_SSL_OUT_CONTENT_LEN )
     {
@@ -649,8 +653,13 @@
      * Add MAC before if needed
      */
 #if defined(MBEDTLS_SSL_SOME_SUITES_USE_MAC)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    if ( transform->psa_alg == MBEDTLS_SSL_NULL_CIPHER  ||
+            ( transform->psa_alg == PSA_ALG_CBC_NO_PADDING
+#else
     if( mode == MBEDTLS_MODE_STREAM ||
         ( mode == MBEDTLS_MODE_CBC
+#endif
 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
           && transform->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED
 #endif
@@ -707,7 +716,11 @@
      * Encrypt
      */
 #if defined(MBEDTLS_SSL_SOME_SUITES_USE_STREAM)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    if ( transform->psa_alg == MBEDTLS_SSL_NULL_CIPHER )
+#else
     if( mode == MBEDTLS_MODE_STREAM )
+#endif
     {
         size_t olen;
 #if defined(MBEDTLS_USE_PSA_CRYPTO)
@@ -779,9 +792,18 @@
 #if defined(MBEDTLS_GCM_C) || \
     defined(MBEDTLS_CCM_C) || \
     defined(MBEDTLS_CHACHAPOLY_C)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    if ( transform->psa_alg == PSA_ALG_GCM ||
+         /* PSA_ALG_IS_AEAD( transform->psa_alg ) corresponds to
+            psa_alg == PSA_ALG_CCM || psa_alg == PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CCM, 8 )
+            in tls context (TLS only uses the default taglen or 8) */
+         PSA_ALG_IS_AEAD( transform->psa_alg ) ||
+         transform->psa_alg == PSA_ALG_CHACHA20_POLY1305 )
+#else
     if( mode == MBEDTLS_MODE_GCM ||
         mode == MBEDTLS_MODE_CCM ||
         mode == MBEDTLS_MODE_CHACHAPOLY )
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
     {
         unsigned char iv[12];
         unsigned char *dynamic_iv;
@@ -897,7 +919,11 @@
     else
 #endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C || MBEDTLS_CHACHAPOLY_C */
 #if defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    if ( transform->psa_alg == PSA_ALG_CBC_NO_PADDING )
+#else
     if( mode == MBEDTLS_MODE_CBC )
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
     {
         int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
         size_t padlen, i;
@@ -1092,7 +1118,9 @@
                              mbedtls_record *rec )
 {
     size_t olen;
+#if !defined(MBEDTLS_USE_PSA_CRYPTO)
     mbedtls_cipher_mode_t mode;
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
     int ret, auth_done = 0;
 #if defined(MBEDTLS_SSL_SOME_SUITES_USE_MAC)
     size_t padlen = 0, correct = 1;
@@ -1117,7 +1145,9 @@
     }
 
     data = rec->buf + rec->data_offset;
+#if !defined(MBEDTLS_USE_PSA_CRYPTO)
     mode = mbedtls_cipher_get_cipher_mode( &transform->cipher_ctx_dec );
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
 
 #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
     /*
@@ -1131,7 +1161,11 @@
 #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
 
 #if defined(MBEDTLS_SSL_SOME_SUITES_USE_STREAM)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    if ( transform->psa_alg == MBEDTLS_SSL_NULL_CIPHER )
+#else
     if( mode == MBEDTLS_MODE_STREAM )
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
     {
         padlen = 0;
 #if defined(MBEDTLS_USE_PSA_CRYPTO)
@@ -1198,9 +1232,18 @@
 #if defined(MBEDTLS_GCM_C) || \
     defined(MBEDTLS_CCM_C) || \
     defined(MBEDTLS_CHACHAPOLY_C)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    if ( transform->psa_alg == PSA_ALG_GCM ||
+         /* PSA_ALG_IS_AEAD( transform->psa_alg ) corresponds to
+            psa_alg == PSA_ALG_CCM || psa_alg == PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CCM, 8 )
+            in tls context (TLS only uses the default taglen or 8) */
+         PSA_ALG_IS_AEAD( transform->psa_alg ) ||
+         transform->psa_alg == PSA_ALG_CHACHA20_POLY1305 )
+#else
     if( mode == MBEDTLS_MODE_GCM ||
         mode == MBEDTLS_MODE_CCM ||
         mode == MBEDTLS_MODE_CHACHAPOLY )
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
     {
         unsigned char iv[12];
         unsigned char *dynamic_iv;
@@ -1322,7 +1365,11 @@
     else
 #endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */
 #if defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    if ( transform->psa_alg == PSA_ALG_CBC_NO_PADDING )
+#else
     if( mode == MBEDTLS_MODE_CBC )
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
     {
         size_t minlen = 0;
 #if defined(MBEDTLS_USE_PSA_CRYPTO)
@@ -5047,12 +5094,62 @@
     size_t transform_expansion = 0;
     const mbedtls_ssl_transform *transform = ssl->transform_out;
     unsigned block_size;
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    psa_key_attributes_t attr = PSA_KEY_ATTRIBUTES_INIT;
+    psa_key_type_t key_type;
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
 
     size_t out_hdr_len = mbedtls_ssl_out_hdr_len( ssl );
 
     if( transform == NULL )
         return( (int) out_hdr_len );
 
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    switch( transform->psa_alg )
+    {
+        case PSA_ALG_GCM:
+        case PSA_ALG_CHACHA20_POLY1305:
+        case MBEDTLS_SSL_NULL_CIPHER:
+            transform_expansion = transform->minlen;
+            break;
+
+        case PSA_ALG_CBC_NO_PADDING:
+            (void) psa_get_key_attributes( transform->psa_key_enc, &attr );
+            key_type = psa_get_key_type( &attr );
+
+            block_size = PSA_BLOCK_CIPHER_BLOCK_LENGTH( key_type );
+
+            /* Expansion due to the addition of the MAC. */
+            transform_expansion += transform->maclen;
+
+            /* Expansion due to the addition of CBC padding;
+             * Theoretically up to 256 bytes, but we never use
+             * more than the block size of the underlying cipher. */
+            transform_expansion += block_size;
+
+            /* For TLS 1.2 or higher, an explicit IV is added
+             * after the record header. */
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+            transform_expansion += block_size;
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+            break;
+
+        default:
+         /* Handle CCM case in default:
+            PSA_ALG_IS_AEAD( transform->psa_alg ) corresponds to
+            psa_alg == PSA_ALG_CCM || psa_alg == PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CCM, 8 )
+            in tls context (TLS only uses the default taglen or 8) */
+            if ( PSA_ALG_IS_AEAD( transform->psa_alg ) )
+            {
+                transform_expansion = transform->minlen;
+                break;
+            }
+
+            MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+            return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+    }
+#else
     switch( mbedtls_cipher_get_cipher_mode( &transform->cipher_ctx_enc ) )
     {
         case MBEDTLS_MODE_GCM:
@@ -5087,6 +5184,7 @@
             MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
             return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
     }
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
 
 #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
     if( transform->out_cid_len != 0 )
@@ -5591,13 +5689,13 @@
     if( transform == NULL )
         return;
 
-    mbedtls_cipher_free( &transform->cipher_ctx_enc );
-    mbedtls_cipher_free( &transform->cipher_ctx_dec );
-
 #if defined(MBEDTLS_USE_PSA_CRYPTO)
     psa_destroy_key( transform->psa_key_enc );
     psa_destroy_key( transform->psa_key_dec );
-#endif
+#else
+    mbedtls_cipher_free( &transform->cipher_ctx_enc );
+    mbedtls_cipher_free( &transform->cipher_ctx_dec );
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
 
 #if defined(MBEDTLS_SSL_SOME_SUITES_USE_MAC)
     mbedtls_md_free( &transform->md_ctx_enc );