Fixing bug for calculating last xor_size in KM_SymmetricCrypt_AES_CFB()

Change-Id: Id791464205464ae190d5c8bc4837a1a67585a748

diff --git a/ta/src/crypto_symmetric.c b/ta/src/crypto_symmetric.c
index 76f0bf219941164166f1866b3054e2fd1faabf8e..e7182f70bc363a244f205cfe9d5b134521f284f7 100644 (file)
--- a/ta/src/crypto_symmetric.c
+++ b/ta/src/crypto_symmetric.c
@@ -76,7 +76,7 @@ TEE_Result KM_SymmetricCrypt_AES_CFB(TEE_ObjectHandle key, uint32_t mode,
 
                // is it the last, shorter than AES_BLOCK_SIZE fragment of input?
                if (input_index + AES_BLOCK_SIZE > input_size) {
-                       xor_size = input_index + AES_BLOCK_SIZE - input_size;
+                       xor_size = input_size - input_index;
                }
 
                // result of this is now XORed with input (plaintext/ciphertext)