在安卓/Java应用中,
我正在处理这段代码:http://aesencryption.net/。当使用encryptbyte和decryptbyte方法时,它们接受byte[]参数并且运行良好。我测试了加密结果,在这个网站http://aesencryption.net/上。
但是,我需要解密来自服务器的数据(响应是字符串),当我将该字符串转换为byte[]时,代码总是抛出异常:javax.crypto.IllegalBlockSizeException: error:0606506D:digital envelope routines:EVP_DecryptFinal_ex:wrong final block length。
我认为问题在于将字符串转换为byte[]时会改变其格式,请问正确的转换方式是什么?请给予建议。
这段代码会抛出异常:
public static void setKey(String myKey) {
MessageDigest sha = null;
try {
key = new byte[]{(byte) '5', (byte) 'F', (byte) '8', (byte) 'p', (byte) 'J', (byte) 't', (byte) 'v', (byte) 'U', (byte) 'm', (byte) 'q', (byte) 'k', (byte) '7', (byte) 'A', (byte) 'M', (byte) 'v', (byte) 'b', (byte) 'q', (byte) 'o', (byte) 'H', (byte) 'M', (byte) '9', (byte) 'a', (byte) 'p', (byte) '4', (byte) '9', (byte) 'm', (byte) 'c', (byte) 'u', (byte) 'u', (byte) '5', (byte) 'B', (byte) 'X'};
System.out.println(new String(key, "UTF-8"));
secretKey = new SecretKeySpec(key, "AES");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static String encrypt(String strToEncrypt) {
try {
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
setEncryptedarr(cipher.doFinal(strToEncrypt.getBytes("UTF-8")));
setEncryptedString(String.valueOf(Base64.encode(cipher.doFinal(strToEncrypt.getBytes("UTF-8")), Base64.DEFAULT)));
//setEncryptedString(Base64.encodeBase64String(cipher.doFinal(strToEncrypt.getBytes("UTF-8"))));
} catch (Exception e) {
e.printStackTrace();
System.out.println("Error while encrypting: " + e.toString());
}
return null;
}
public static String decryptbyte(byte[] strToDecrypt) {
try {
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
cipher.init(Cipher.DECRYPT_MODE, secretKey);
setDecryptedarr(cipher.doFinal(strToDecrypt));
System.out.println("encrypt : decropted size : " + getDecryptedarr().length);
setDecryptedString(new String(cipher.doFinal(strToDecrypt)));
} catch (Exception e) {
System.out.println("Error wnhile decrypting: " + e.toString());
e.printStackTrace();
}
return null;
}
public static String decrypt(String strToDecrypt) {
try {
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
cipher.init(Cipher.DECRYPT_MODE, secretKey);
setDecryptedarr(cipher.doFinal(Base64.decode(strToDecrypt, Base64.DEFAULT)));
setDecryptedString(new String(cipher.doFinal(Base64.decode(strToDecrypt, Base64.DEFAULT))));
} catch (Exception e) {
e.printStackTrace();
System.out.println("Error while decrypting: " + e.toString());
}
return null;
}
我正在处理这段代码:http://aesencryption.net/。当使用encryptbyte和decryptbyte方法时,它们接受byte[]参数并且运行良好。我测试了加密结果,在这个网站http://aesencryption.net/上。
但是,我需要解密来自服务器的数据(响应是字符串),当我将该字符串转换为byte[]时,代码总是抛出异常:javax.crypto.IllegalBlockSizeException: error:0606506D:digital envelope routines:EVP_DecryptFinal_ex:wrong final block length。
我认为问题在于将字符串转换为byte[]时会改变其格式,请问正确的转换方式是什么?请给予建议。
这段代码会抛出异常:
try {
AES.setKey("");
final String strToDecrypt = "tATTXSdXI4w0oiu/fzgpyA==";
AES.decryptbyte(toBytes(strToDecrypt.toCharArray()));
} catch (Exception ex) {
ex.printStackTrace();
}
这是一个异常。
01-21 15:24:55.861 15700-15700/ W/System.err: javax.crypto.IllegalBlockSizeException: error:0606506D:digital envelope routines:EVP_DecryptFinal_ex:wrong final block length
01-21 15:24:55.861 15700-15700/ W/System.err: at com.android.org.conscrypt.NativeCrypto.EVP_CipherFinal_ex(Native Method)
01-21 15:24:55.861 15700-15700/ W/System.err: at com.android.org.conscrypt.OpenSSLCipher.doFinalInternal(OpenSSLCipher.java:430)
01-21 15:24:55.861 15700-15700/ W/System.err: at com.android.org.conscrypt.OpenSSLCipher.engineDoFinal(OpenSSLCipher.java:466)
01-21 15:24:55.861 15700-15700/ W/System.err: at javax.crypto.Cipher.doFinal(Cipher.java:1340)
01-21 15:24:55.861 15700-15700/ W/System.err: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
01-21 15:24:55.861 15700-15700/ W/System.err: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2648)
01-21 15:24:55.861 15700-15700/ W/System.err: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2769)
01-21 15:24:55.861 15700-15700/ W/System.err: at android.app.ActivityThread.access$900(ActivityThread.java:177)
01-21 15:24:55.861 15700-15700/ W/System.err: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1430)
01-21 15:24:55.861 15700-15700/ W/System.err: at android.os.Handler.dispatchMessage(Handler.java:102)
01-21 15:24:55.861 15700-15700/ W/System.err: at android.os.Looper.loop(Looper.java:135)
01-21 15:24:55.861 15700-15700/ W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5910)
01-21 15:24:55.861 15700-15700/ W/System.err: at java.lang.reflect.Method.invoke(Native Method)
01-21 15:24:55.861 15700-15700/ W/System.err: at java.lang.reflect.Method.invoke(Method.java:372)
01-21 15:24:55.861 15700-15700/ W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405)
01-21 15:24:55.861 15700-15700/ W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)