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| import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Hex;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import java.security.SecureRandom;
import java.util.Base64;
public class SecretUtil {
private static final Logger log = LoggerFactory.getLogger(SecretUtil.class);
private static final Provider BOUNCY_CASTLE_PROVIDER = new BouncyCastleProvider();
private static final String SM4 = "SM4";
private SecretUtil() {
}
public static String generateSm4Key() {
try {
KeyGenerator kg = KeyGenerator.getInstance(SM4, BOUNCY_CASTLE_PROVIDER);
kg.init(128, new SecureRandom());
byte[] encoded = kg.generateKey().getEncoded();
return new String(Hex.encodeHex(encoded));
} catch (NoSuchAlgorithmException e) {
log.error("生成 SM4 key 失败：{}", e.getMessage(), e);
return null;
}
}
public static String sm4Encrypt(String content, String key) {
try {
return encrypt(content, Hex.decodeHex(key), SM4, BOUNCY_CASTLE_PROVIDER);
} catch (DecoderException e) {
log.error("SM4 数据加密失败，key 无法解析：{}", e.getMessage(), e);
return null;
}
}
public static String sm4Decrypt(String content, String key) {
try {
return decrypt(content, Hex.decodeHex(key), SM4, BOUNCY_CASTLE_PROVIDER);
} catch (DecoderException e) {
log.error("SM4 数据解密失败，key 无法解析：{}", e.getMessage(), e);
return null;
}
}
public static String encrypt(String content, byte[] key, String algorithm, Provider provider) {
try {
Cipher cipher = provider == null
? Cipher.getInstance(algorithm)
: Cipher.getInstance(algorithm, provider);
cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key, algorithm));
byte[] encryptStr = cipher.doFinal(content.getBytes(StandardCharsets.UTF_8));
return Base64.getEncoder().encodeToString(encryptStr);
} catch (Exception e) {
log.error("{} 数据加密失败：{}", algorithm, e.getMessage(), e);
return null;
}
}
public static String decrypt(String content, byte[] key, String algorithm, Provider provider) {
try {
byte[] encryptByte = Base64.getDecoder().decode(content);
Cipher cipher = provider == null
? Cipher.getInstance(algorithm)
: Cipher.getInstance(algorithm, provider);
cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key, algorithm));
byte[] decryptBytes = cipher.doFinal(encryptByte);
return new String(decryptBytes);
} catch (Exception e) {
log.error("{} 数据解密失败：{}", algorithm, e.getMessage(), e);
return null;
}
}
}
|