使用Bouncy Castle(pom版本:bcprov-jdk15on 1.59)中SM4 加密解密算法 ECB
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2022-04-12 22:09:19
SM4 加密算法 加密 SM4算法是一种分组密码算法。其分组长度为128bit,密钥长度也为128bit。加密算法与密钥扩展算法均采用32轮非线性迭代结构,以字(32位)为单位进行加密运算,每一次迭代运算均为一轮变换函数F。SM4算法加/解密算法的结构相同,只是使用轮密钥相反,其中解密轮密钥是加密轮密钥的逆序。public class encryption_decrypt { static { Security.addProvider(new BouncyCastleProvi...
SM4 加密算法 加密 SM4算法是一种分组密码算法。其分组长度为128bit,密钥长度也为128bit。
加密算法与密钥扩展算法均采用32轮非线性迭代结构,以字(32位)为单位进行加密运算,每一次迭代运算均为一轮变换函数F。SM4算法加/解密算法的结构相同,只是使用轮密钥相反,其中解密轮密钥是加密轮密钥的逆序。
public class encryption_decrypt {
static {
Security.addProvider(new BouncyCastleProvider());
}
private static final String ENCODING = "UTF-8";
public static final String ALGORITHM_NAME = "SM4";
// 加密算法/分组加密模式/分组填充方式
// PKCS5Padding-以8个字节为一组进行分组加密
// 定义分组加密模式使用:PKCS5Padding
public static final String ALGORITHM_NAME_ECB_PADDING = "SM4/ECB/PKCS5Padding";
// 128-32位16进制;256-64位16进制
public static final int DEFAULT_KEY_SIZE = 128;
private static Cipher generateEcbCipher(String algorithmName, int mode, byte[] key) throws Exception {
Cipher cipher = Cipher.getInstance(algorithmName, BouncyCastleProvider.PROVIDER_NAME);
Key sm4Key = new SecretKeySpec(key, ALGORITHM_NAME);
cipher.init(mode, sm4Key);
return cipher;
}
public static String encryptEcb(byte[] hexKey, String paramStr) throws Exception {
String cipherText = null;
byte[] keyData = hexKey;
byte[] srcData = paramStr.getBytes(ENCODING);
byte[] cipherArray = encrypt_Ecb_Padding(keyData, srcData);
cipherText = Base64.getEncoder().encodeToString(cipherArray);
return cipherText;
}
public static byte[] encrypt_Ecb_Padding(byte[] key, byte[] data) throws Exception {
Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_PADDING, Cipher.ENCRYPT_MODE, key);
return cipher.doFinal(data);
}
public static String decryptEcb(byte[] hexKey, String cipherText) throws Exception {
String decryptStr = "";
byte[] keyData = hexKey;
byte[] cipherData = Base64.getDecoder().decode(cipherText);
byte[] srcData = decrypt_Ecb_Padding(keyData, cipherData);
decryptStr = new String(srcData, ENCODING);
return decryptStr;
}
public static byte[] decrypt_Ecb_Padding(byte[] key, byte[] cipherText) throws Exception {
Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_PADDING, Cipher.DECRYPT_MODE, key);
return cipher.doFinal(cipherText);
}
public static boolean verifyEcb(byte[] hexKey, String cipherText, String paramStr) throws Exception {
boolean flag = false;
byte[] keyData = hexKey;
byte[] cipherData = Base64.getDecoder().decode(cipherText);
byte[] decryptData = decrypt_Ecb_Padding(keyData, cipherData);
byte[] srcData = paramStr.getBytes(ENCODING);
flag = Arrays.equals(decryptData, srcData);
return flag;
}
}
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