CKM: Adjust GCM tag len tests to GP

According to GP API spec the shortest supported GCM tag length is 96
bits. Software backend allows shorter tags.

Expect error in case of tags shorter than 96 in TZ mode.

Change-Id: I3d716ab57670c735470c78069fb620edccc84daf

diff --git a/src/ckm/unprivileged/encryption-decryption.cpp b/src/ckm/unprivileged/encryption-decryption.cpp
index 3b2af2d..c183c81 100644 (file)
--- a/src/ckm/unprivileged/encryption-decryption.cpp
+++ b/src/ckm/unprivileged/encryption-decryption.cpp
@@ -727,9 +727,16 @@ void testGcmEncryptionTagLen(const Algo& algo)
             { 116,  EncryptionError::INVALID_PARAM },
             { 124,  EncryptionError::INVALID_PARAM },
             { 256,  EncryptionError::INVALID_PARAM },
+#ifdef TZ_BACKEND
+            { 32,   EncryptionError::INVALID_PARAM },
+            { 64,   EncryptionError::INVALID_PARAM },
+            // legal tag lengths
+#else
             // legal tag lengths
             { 32,   EncryptionError::SUCCESS },
             { 64,   EncryptionError::SUCCESS },
+#endif
+
             { 96,   EncryptionError::SUCCESS },
             { 104,  EncryptionError::SUCCESS },
             { 112,  EncryptionError::SUCCESS },