diff --git a/tests/suites/test_suite_psa_crypto_metadata.data b/tests/suites/test_suite_psa_crypto_metadata.data
index 4e47e0c..a3668fc 100644
--- a/tests/suites/test_suite_psa_crypto_metadata.data
+++ b/tests/suites/test_suite_psa_crypto_metadata.data
@@ -293,27 +293,15 @@
 
 Block cipher key type: AES
 depends_on:PSA_WANT_KEY_TYPE_AES
-block_cipher_key_type:PSA_KEY_TYPE_AES:16:0
+block_cipher_key_type:PSA_KEY_TYPE_AES:16
 
 Block cipher key type: DES
 depends_on:PSA_WANT_KEY_TYPE_DES
-block_cipher_key_type:PSA_KEY_TYPE_DES:8:0
+block_cipher_key_type:PSA_KEY_TYPE_DES:8
 
 Block cipher key type: Camellia
 depends_on:PSA_WANT_KEY_TYPE_CAMELLIA
-block_cipher_key_type:PSA_KEY_TYPE_CAMELLIA:16:0
-
-Block cipher key type: AES non power 2 block_size  (24)
-depends_on:PSA_WANT_KEY_TYPE_AES
-block_cipher_key_type:PSA_KEY_TYPE_AES:24:1
-
-Block cipher key type: AES non power 2 block_size (12)
-depends_on:PSA_WANT_KEY_TYPE_AES
-block_cipher_key_type:PSA_KEY_TYPE_AES:12:1
-
-Block cipher key type: DES non power 2 block_size (24)
-depends_on:PSA_WANT_KEY_TYPE_DES
-block_cipher_key_type:PSA_KEY_TYPE_DES:24:1
+block_cipher_key_type:PSA_KEY_TYPE_CAMELLIA:16
 
 Stream cipher key type: ChaCha20
 depends_on:PSA_WANT_KEY_TYPE_CHACHA20
diff --git a/tests/suites/test_suite_psa_crypto_metadata.function b/tests/suites/test_suite_psa_crypto_metadata.function
index fbcc83a..2722aea 100644
--- a/tests/suites/test_suite_psa_crypto_metadata.function
+++ b/tests/suites/test_suite_psa_crypto_metadata.function
@@ -619,7 +619,7 @@
 /* END_CASE */
 
 /* BEGIN_CASE */
-void block_cipher_key_type( int type_arg, int block_size_arg, int expecting_power_2 )
+void block_cipher_key_type( int type_arg, int block_size_arg)
 {
     psa_key_type_t type = type_arg;
     size_t block_size = block_size_arg;
@@ -629,26 +629,29 @@
     TEST_EQUAL( type & PSA_KEY_TYPE_CATEGORY_MASK,
                 PSA_KEY_TYPE_CATEGORY_SYMMETRIC );
 
-    if (expecting_power_2 == 0)
-        TEST_EQUAL( PSA_BLOCK_CIPHER_BLOCK_LENGTH( type ), block_size );
+    TEST_EQUAL( PSA_BLOCK_CIPHER_BLOCK_LENGTH( type ), block_size );
 
     /* PSA_ROUND_UP_TO_MULTIPLE(block_size, length) in crypto_sizes.h
-     * Requires block sizes to be a power of 2. The following test ensures
-     * the block sizes are indeed powers of 2.
+     * Requires block sizes to be a power of 2.
+     * The following creates a bit and shifts along until it finds a
+     * match or a mismatch.
      */
     int check = 0;
 
-    while( block_size > 1)
+    for (size_t index = 1; index > 0; index = index << 1)
     {
-        if ( block_size % 2 != 0 )
+        if (index == block_size)
+        {
+            check = 0;
+            break;
+        }
+        if (index > block_size)
         {
             check = 1;
             break;
         }
-        block_size = block_size / 2;
     }
-    /* expecting_power_2 should be 0 if true (e.g 16, 32 etc.) or 1 otherwise */
-    TEST_EQUAL( check, expecting_power_2 );
+    TEST_EQUAL( check, 0);
 }
 /* END_CASE */