java - 填充JAVA加密blockSizeException

Question

我认为这个问题已经被问了一百万遍了，但是我找不到一个可以解决我的问题的答案。

我继承了一段代码。它可以很好地与字符串XXXX100一起使用，但不能与XXXX1000一起使用。它可以很好地加密（它生成一个没有错误的字符串），但不能解密更长的字符串。它抛出：

javax.crypto.IllegalBlockSizeException：使用填充密码解密时，输入长度必须是8的倍数

我需要对要解密的输入文本做其他事情，在某个地方设置参数...还是其他？

package projectlocal.encryptionutilities;

import java.io.UnsupportedEncodingException;
import java.security.GeneralSecurityException;
import java.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

public class SimpleCrypt {

/** encryption master password */
private static final char[] AUTHENTIC = "8zrahH9HiDeJM60W0gmZ".toCharArray();
/** encryption algorithm */
//private static final String ALGORITHM = "PBEWithMD5AndDES";
private static final String ALGORITHM = "PBEWithMD5AndDES";
/** charset */
private static final String UTF8_CHARSET = "UTF-8";
/** encryption seed */

private static final byte[] SALT = {
    (byte) 0xde, (byte) 0x33, (byte) 0x10, (byte) 0x12,
    (byte) 0xde, (byte) 0x33, (byte) 0x10, (byte) 0x12,
};

/** create private constructor to prevent instantiation */
private SimpleCrypt() {/* ignore */}

public static String encrypt(final String property) throws GeneralSecurityException, UnsupportedEncodingException {
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
    SecretKey key = keyFactory.generateSecret(new PBEKeySpec(AUTHENTIC));
    Cipher pbeCipher = Cipher.getInstance(ALGORITHM);
    pbeCipher.init(Cipher.ENCRYPT_MODE, key, new PBEParameterSpec(SALT, 20));
    return Base64.getMimeEncoder().encodeToString(pbeCipher.doFinal(property.getBytes()));
}

public static String decrypt(final String property) throws UnsupportedEncodingException, GeneralSecurityException {
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
    SecretKey key = keyFactory.generateSecret(new PBEKeySpec(AUTHENTIC));
    Cipher pbeCipher = Cipher.getInstance(ALGORITHM);
    pbeCipher.init(Cipher.DECRYPT_MODE, key, new PBEParameterSpec(SALT, 20));
    return new String(pbeCipher.doFinal(Base64.getMimeDecoder().decode(property)), UTF8_CHARSET);
}

}

Answer 1

在其他地方。上面的代码工作正常。另一种例程是截断较长的字符串。

感谢您帮助我改善此问题。