异常

org.bouncycastle.jcajce.provider.symmetric.util.BaseBlockCipher$InvalidKeyOrParametersException: Key length not 128/192/256 bits.

at org.bouncycastle.jcajce.provider.symmetric.util.BaseBlockCipher.engineInit(Unknown Source)

at javax.crypto.Cipher.implInit(Cipher.java:806)

at javax.crypto.Cipher.chooseProvider(Cipher.java:864)

at javax.crypto.Cipher.init(Cipher.java:1396)

at javax.crypto.Cipher.init(Cipher.java:1327)

at com.cust.wechat.utils.AesCbcUtil.decrypt(AesCbcUtil.java:62)

at com.cust.wechat.utils.AesCbcUtil.main(AesCbcUtil.java:117)

代码

public static void main(String[] args) throws Exception

{

//这个会报异常

String sessionKey = "o-kJW4_3AVXz5s96JgUkcBE4M3LA";

String encryptedData = "JDIIqASgtHXbNkolc7j0cV4f3bakhZMj/Z2gbxJtCCFmzJmbZeUXKujEb4DEAhfrHH90qhVMpKTB+SAAjdicjT7waWtgexWfipIgZS2FREJvMmdNsp/ahhtn68joAhZze458X0YFQ4i01/Y5UFr1XktllN7C+LSb5zVqOzPGG20zER5TtB1XaZig1PmOF4CqO3A7ZV7nUnr0itIDhSXPZhQqJCNwd93EKyi7lVnCBSOF6Fqb3Wp6na3KrKP1lON1UV5g8DDZRJFOpsvVMMP6KNdy8Sf5DTn9PE7+XcZ2yVwiIPBihsA0iPMlv3jhOnzhuEtz7M4+02f0V1MNS31kZuvQb0NnwGGwRb8JrlTF1c70InLMUvgRG66gFE7otx7v/aHvrv02MitbjgL5Lg76O8Og6Tm1/gFkQaPoz4F1AQ+SNTnjgRYSFHwT2AQXusG2hJ678r8+kcUTR1tPRSrc+zBxNoEA3SPNgDZEFE557FI=";

String iv = "dqNtltSAZGV9Q+O9Hh8mLg==";

//这个不会报异常

String sessionKey1 = "tiihtNczf5v6AKRyjwEUhQ==";

String encryptedData1 = "CiyLU1Aw2KjvrjMdj8YKliAjtP4gsMZMQmRzooG2xrDcvSnxIMXFufNstNGTyaGS9uT5geRa0W4oTOb1WT7fJlAC+oNPdbB+3hVbJSRgv+4lGOETKUQz6OYStslQ142dNCuabNPGBzlooOmB231qMM85d2/fV6ChevvXvQP8Hkue1poOFtnEtpyxVLW1zAo6/1Xx1COxFvrc2d7UL/lmHInNlxuacJXwu0fjpXfz/YqYzBIBzD6WUfTIF9GRHpOn/Hz7saL8xz+W//FRAUid1OksQaQx4CMs8LOddcQhULW4ucetDf96JcR3g0gfRK4PC7E/r7Z6xNrXd2UIeorGj5Ef7b1pJAYB6Y5anaHqZ9J6nKEBvB4DnNLIVWSgARns/8wR2SiRS7MNACwTyrGvt9ts8p12PKFdlqYTopNHR1Vf7XjfhQlVsAJdNiKdYmYVoKlaRv85IfVunYzO0IKXsyl7JCUjCpoG20f0a04COwfneQAGGwd5oa+T8yO5hzuyDb/XcxxmK01EpqOyuxINew==";

String iv1 = "r7BXXKkLb8qrSNn05n0qiA==";

System.out.println(AesCbcUtil.decrypt(encryptedData1, sessionKey1, iv1, "UTF-8"));

}

public static String decrypt(String data, String key, String iv, String encodingFormat) throws Exception

{

//initialize();

//被加密的数据

byte[] dataByte = Base64.decodeBase64(data);

//加密秘钥

byte[] keyByte = Base64.decodeBase64(key);

//偏移量

byte[] ivByte = Base64.decodeBase64(iv);

try

{

Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");

SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");

//生成iv

AlgorithmParameters parameters = AlgorithmParameters.getInstance("AES");

parameters.init(new IvParameterSpec(ivByte));

// 初始化

cipher.init(Cipher.DECRYPT_MODE, spec, parameters);

byte[] resultByte = cipher.doFinal(dataByte);

if (null != resultByte && resultByte.length > 0)

{

String result = new String(resultByte, encodingFormat);

return result;

}

return null;

}

catch (NoSuchAlgorithmException e)

{

e.printStackTrace();

}

catch (NoSuchPaddingException e)

{

e.printStackTrace();

}

catch (InvalidParameterSpecException e)

{

e.printStackTrace();

}

catch (InvalidKeyException e)

{

e.printStackTrace();

}

catch (InvalidAlgorithmParameterException e)

{

e.printStackTrace();

}

catch (IllegalBlockSizeException e)

{

e.printStackTrace();

}

catch (BadPaddingException e)

{

e.printStackTrace();

}

catch (UnsupportedEncodingException e)

{

e.printStackTrace();

}

return null;

}