private Sm4Ctr sm4Ctr;

byte[] key ,iv ;

@Before

public void beforeTest(){

sm4Ctr = new Sm4Ctr();

key=new byte[]{99, -49, -44, -61, 104, 76, -65, 88, 55, 54, 48, -81, 99, -10, 50, 22};

iv=new byte[]{-127, 39, -104, -97, 61, -119, 85, -18, -14, -79, 47, -92, -113, 92, 28, -34};

}

@Test

public void encryptTest(){

String ciphertext_1="gmssl",ciphertext_2="_",ciphertext_3="v3";

byte[] ciphertext = new byte[64];

sm4Ctr.init(key, iv);

int cipherlen = sm4Ctr.update(ciphertext_1.getBytes(), 0, ciphertext_1.length(), ciphertext, 0);

cipherlen += sm4Ctr.update(ciphertext_2.getBytes(), 0, ciphertext_2.length(), ciphertext, cipherlen);

cipherlen += sm4Ctr.update(ciphertext_3.getBytes(), 0, ciphertext_3.length(), ciphertext, cipherlen);

cipherlen += sm4Ctr.doFinal(ciphertext, cipherlen);

byte[] ciphertextEnd = Arrays.copyOfRange(ciphertext,0,cipherlen);

//System.out.println(HexUtil.byteToHex(ciphertextEnd));

Assert.assertNotNull("data is empty exception!",HexUtil.byteToHex(ciphertextEnd));

}

@Test

public void decryptTest(){

String plainText="gmssl_v3";

String ciphertext="912c3317275d8e5f";

byte[] ciphertextByte=HexUtil.hexToByte(ciphertext);

byte[] plaintext = new byte[64];

sm4Ctr.init(key, iv);

int plainlen = sm4Ctr.update(ciphertextByte, 0, ciphertext.length()/2, plaintext, 0);

plainlen += sm4Ctr.doFinal(plaintext, plainlen);

plaintext=Arrays.copyOfRange(plaintext,0,plainlen);

//System.out.println(new String(plaintext));

Assert.assertEquals("original value is not equal to the expected value after decryption!",plainText,new String(plaintext));

}