Sm4Cbc sm4Cbc;

byte[] key , iv ;

@Before

public void beforeTest(){

sm4Cbc = new Sm4Cbc();

key = new byte[]{-73, -55, -122, -95, 0, -4, 51, -38, 125, -31, 38, 12, 112, 8, -50, -92};

iv = new byte[]{88, 121, -51, 88, 32, -85, 98, 56, 108, 18, 102, -73, -122, -59, -97, -25};

}

@Test

public void encryptTest(){

String testStr="gmssl";

byte[] plaintext = testStr.getBytes();

byte[] ciphertext = new byte[plaintext.length+Sm4Cbc.BLOCK_SIZE];

sm4Cbc.init(key, iv, true);

int cipherlen = sm4Cbc.update(plaintext, 0, plaintext.length, ciphertext, 0);

cipherlen += sm4Cbc.doFinal(ciphertext, cipherlen);

byte[] ciphertext1 =Arrays.copyOfRange(ciphertext,0,cipherlen);

//System.out.println("cipher:"+HexUtil.byteToHex(ciphertext1));

Assert.assertNotNull("data is empty exception!",HexUtil.byteToHex(ciphertext1));

}

@Test

public void decryptTest(){

String cipherHex="ccedec05b742098b33e0fc8c5c006365";

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

sm4Cbc.init(key, iv, false);

byte[] decrypted = new byte[ciphertext.length + Sm4Cbc.BLOCK_SIZE]; // prepare large enough plaintext buffer

int decryptedOffset = 0;

int decryptedLen;

int ciphertextOffset = 0;

decryptedLen = sm4Cbc.update(ciphertext, ciphertextOffset, ciphertext.length, decrypted, decryptedOffset);

decryptedOffset += decryptedLen;

decryptedLen += sm4Cbc.doFinal(decrypted, decryptedOffset);

byte[] plaintext =Arrays.copyOfRange(decrypted,0,decryptedLen);

String plaintextStr=new String(plaintext);

//System.out.println(plaintextStr);

Assert.assertEquals("original value is not equal to the expected value after decryption!","gmssl",plaintextStr);

}