Java相当于Convert.FromBase64String方法

时间:2010-02-16 17:34:18

标签: java base64 unsigned

是否有一些Java等价的Convert.FromBase64String

  

将指定的字符串转换为等效的8位无符号整数数组,该字符串将二进制数据编码为基数为64的数字。

我试过了:

对任何建议都会感激不尽!

2 个答案:

答案 0 :(得分:3)

一般情况下,如果标准Java库没有您需要的东西,那么很可能是Apache Commons框架。在这种情况下,您需要 decodeBase64 中的 commons.codec.binary.Base64 方法。

答案 1 :(得分:0)

通过Convert.FromBase64String中的AES加密中的C#转换密钥和初始向量。

在Java中,可以使用DatatypeConverter.parseBase64Binary(string)方法。为了使用它,请导入import javax.xml.bind.*;

这是示例程序

import java.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import javax.xml.bind.*;

class AESEncryption {

    private static final String key = "type your key here.(base64)";
    private static final String initVector = "type your initial vector here.(base64)";

    static byte[] encodedKey = DatatypeConverter.parseBase64Binary(key);
    static byte[] encodedIV = DatatypeConverter.parseBase64Binary(initVector);

    public static String encrypt(final String value) {
        try {
            IvParameterSpec iv = new IvParameterSpec(encodedIV);
            SecretKeySpec skeySpec = new SecretKeySpec(encodedKey, "AES");

            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);

            byte[] encrypted = cipher.doFinal(value.getBytes());

            return Base64.getEncoder().encodeToString(encrypted);

        } catch (final Exception ex) {
            ex.printStackTrace();
        }
        return null;
    }

    public static String decrypt(final String encrypted) {
        try {
            IvParameterSpec iv = new IvParameterSpec(encodedIV);
            SecretKeySpec skeySpec = new SecretKeySpec(encodedKey, "AES");

            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);

            byte[] original = cipher.doFinal(Base64.getDecoder().decode(encrypted));

            return new String(original);

        } catch (final Exception ex) {
            ex.printStackTrace();
        }

        return null;
    }

    public static void main(final String[] args) {

        String originalString = "Here is your text to be encrypted.";
        System.out.println("Original String to encrypt - " + originalString);

        String encryptedString = encrypt(originalString);
        System.out.println("Encrypted String - " + encryptedString);

        String decryptedString = decrypt(encryptedString);
        System.out.println("After decryption - " + decryptedString);
    }
}