Java AES_CBC加解密工具类
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
public class AesCbcCodec {
/**
* <tt>Java</tt> 支持 <tt>PKCS5Padding</tt> 填充方式 <br>
* <tt>BouncyCastle</tt> 支持 <tt>PKCS7Padding</tt> 填充方式
*/
private static final String TRANSFORMATION = "AES/CBC/PKCS7Padding";
private static final String ALGORITHM = "AES";
static {
Security.addProvider(new BouncyCastleProvider());
}
/**
* 加密数据
*
* @param data 待加密数据
* @param key 密钥
* @param iv 偏移向量
* @return 加密后的数据
* @throws GeneralSecurityException
*/
public static byte[] encrypt(byte[] data, byte[] key, byte[] iv) throws GeneralSecurityException {
// 实例化Cipher对象，它用于完成实际的加密操作
Cipher cipher = Cipher.getInstance(TRANSFORMATION, BouncyCastleProvider.PROVIDER_NAME);
// 使用CBC模式，需要一个向量iv，可增加加密算法的强度
IvParameterSpec ips = new IvParameterSpec(iv);
cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key, ALGORITHM), ips);
return cipher.doFinal(data);
}
/**
* 加密数据 (charset="UTF-8")
*
* @param data 待加密数据
* @param base64Key 密钥 (base64)
* @param base64Iv 偏移向量 (base64)
* @param charset 字符集编码
* @return 加密后的数据 (base64)
* @throws GeneralSecurityException
* @throws IOException
*/
public static String encrypt_base64(String data, String base64Key, String base64Iv)
throws GeneralSecurityException, IOException {
return encrypt_base64(data, base64Key, base64Iv, "UTF-8");
}
/**
* 加密数据 (charset="UTF-8")
*
* @param data 待加密数据
* @param hexKey 密钥 (hex)
* @param hexIv 偏移向量 (hex)
* @param charset 字符集编码
* @return 加密后的数据 (hex)
* @throws GeneralSecurityException
* @throws IOException
*/
public static String encrypt_hex(String data, String hexKey, String hexIv)
throws GeneralSecurityException, IOException {
return encrypt_hex(data, hexKey, hexIv, "UTF-8");
}
/**
* 加密数据
*
* @param data 待加密数据
* @param base64Key 密钥 (base64)
* @param base64Iv 偏移向量 (base64)
* @param charset 字符集编码
* @return 加密后的数据 (base64)
* @throws GeneralSecurityException
* @throws IOException
*/
public static String encrypt_base64(String data, String base64Key, String base64Iv, String charset)
throws GeneralSecurityException, IOException {
byte[] target = encrypt(data.getBytes(charset), decodeBase64(base64Key), decodeBase64(base64Iv));
return encodeBase64String(target);
}
/**
* 加密数据
*
* @param data 待加密数据
* @param hexKey 密钥 (hex)
* @param hexIv 偏移向量 (hex)
* @param charset 字符集编码
* @return 加密后的数据 (hex)
* @throws GeneralSecurityException
* @throws IOException
*/
public static String encrypt_hex(String data, String hexKey, String hexIv, String charset)
throws GeneralSecurityException, IOException {
byte[] target = encrypt(data.getBytes(charset), decodeHex(hexKey), decodeHex(hexIv));
return encodeHexString(target);
}
/**
* 解密数据
*
* @param data 待解密数据
* @param key 密钥
* @param iv 偏移向量
* @return 解密后的数据
* @throws Exception
*/
public static byte[] decrypt(byte[] data, byte[] key, byte[] iv) throws GeneralSecurityException {
// 实例化Cipher对象，它用于完成实际的加密操作
Cipher cipher = Cipher.getInstance(TRANSFORMATION, BouncyCastleProvider.PROVIDER_NAME);
// 使用CBC模式，需要一个向量iv，可增加加密算法的强度
IvParameterSpec ips = new IvParameterSpec(iv);
cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key, ALGORITHM), ips);
return cipher.doFinal(data);
}
/**
* 解密数据 (charset="UTF-8")
*
* @param base64Data 待解密数据 (base64)
* @param base64Key 密钥 (base64)
* @param base64Iv 偏移向量 (base64)
* @return 解密后的数据
* @throws GeneralSecurityException
* @throws IOException
*/
public static String decrypt_base64(String base64Data, String base64Key, String base64Iv)
throws GeneralSecurityException, IOException {
return decrypt_base64(base64Data, base64Key, base64Iv, "UTF-8");
}
/**
* 解密数据 (charset="UTF-8")
*
* @param hexData 待解密数据 (hex)
* @param hexKey 密钥 (hex)
* @param hexIv 偏移向量 (hex)
* @return 解密后的数据
* @throws GeneralSecurityException
* @throws IOException
*/
public static String decrypt_hex(String hexData, String hexKey, String hexIv)
throws GeneralSecurityException, IOException {
return decrypt_hex(hexData, hexKey, hexIv, "UTF-8");
}
/**
* 解密数据
*
* @param base64Data 待解密数据 (base64)
* @param base64Key 密钥 (base64)
* @param base64Iv 偏移向量 (base64)
* @param charset 字符集编码
* @return 解密后的数据
* @throws GeneralSecurityException
* @throws IOException
*/
public static String decrypt_base64(String base64Data, String base64Key, String base64Iv, String charset)
throws GeneralSecurityException, IOException {
byte[] target = decrypt(decodeBase64(base64Data), decodeBase64(base64Key), decodeBase64(base64Iv));
return new String(target, charset);
}
/**
* 解密数据
*
* @param hexData 待解密数据 (hex)
* @param hexKey 密钥 (hex)
* @param hexIv 偏移向量 (hex)
* @param charset 字符集编码
* @return 解密后的数据
* @throws GeneralSecurityException
* @throws IOException
*/
public static String decrypt_hex(String hexData, String hexKey, String hexIv, String charset)
throws GeneralSecurityException, IOException {
byte[] target = decrypt(decodeHex(hexData), decodeHex(hexKey), decodeHex(hexIv));
return new String(target, charset);
}
// ============================================================================================
/**
* Converts a String representing hexadecimal values into an array of bytes of those same values. The
* returned array will be half the length of the passed String, as it takes two characters to represent any given
* byte. An exception is thrown if the passed String has an odd number of elements.
*
* @param data
* A String containing hexadecimal digits
* @return A byte array containing binary data decoded from the supplied char array.
* @throws IOException
* Thrown if an odd number or illegal of characters is supplied
*/
public static byte[] decodeHex(String data) throws IOException {
try {
return Hex.decodeHex(data);
} catch (DecoderException e) {
throw new IOException(e.getMessage(), e.getCause());
}
}
/**
* Converts an array of bytes into a String representing the hexadecimal values of each byte in order. The returned
* String will be double the length of the passed array, as it takes two characters to represent any given byte.
*
* @param data
* a byte[] to convert to Hex characters
* @return A String containing upper-case hexadecimal characters
*/
public static String encodeHexString(byte[] data) {
return Hex.encodeHexString(data, false);
}
/**
* Decodes a Base64 String into octets.
* <p>
* <b>Note:</b> this method seamlessly handles data encoded in URL-safe or normal mode.
* </p>
*
* @param base64String
* String containing Base64 data
* @return Array containing decoded data.
*/
public static byte[] decodeBase64(String data) {
return Base64.decodeBase64(data);
}
/**
* Encodes binary data using the base64 algorithm but does not chunk the output.
*
* NOTE: We changed the behaviour of this method from multi-line chunking (commons-codec-1.4) to
* single-line non-chunking (commons-codec-1.5).
*
* @param binaryData
* binary data to encode
* @return String containing Base64 characters.
*/
public static String encodeBase64String(byte[] data) {
return Base64.encodeBase64String(data);
}
}
