StreamTransformationFilter：AES解密中找到的无效的PKCS＃7块填充 [英] StreamTransformationFilter: invalid PKCS #7 block padding found in AES decryption

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本文介绍了StreamTransformationFilter：AES解密中找到的无效的PKCS＃7块填充的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我想在我的C ++代码中使用AES-256加密/解密，我使用cryptoPP库，我实施加密和解密。但我得到错误：StreamTransformationFilter：无效PKCS＃7块填充发现错误。



我测试的senario是：



首先加密myplaintext然后解密 - >没有错误在这里。



第二我解密上面创建的密码 - >这里我得到的错误。



知道这里有同样的问题，但我不能解决我的问题：（



这里我设置iv：

 字节IV [16]; 
串strIv =162169848599E7C792BF58BFA53D88E6; 
的memcpy（四，strIv.data（），strIv.length（））;

加密：

 字符串CryptoAES ::加密（字符串平原，串strkey）{
 COUT<<\\\
plain文字：<<平原; 
 COUT<<\\ \
密钥来加密：&所述;&下; strkey; 
字节密钥[AES :: MAX_KEYLENGTH]; 
的memcpy（标号，strkey.data（），strkey.length（））; 
串encodedKey，decodedKey，ciphertextEncode，密文; 
 encodedKey.clear（）; 
 decodedKey.clear（）; 
 ciphertextEncode.clear（）; 
 ciphertext.clear（）; 
 StringSource（key，sizeof（key），true，new HexEncoder（new StringSink（encodedKey）））; 
 StringSource ssk（encodedKey，true，new HexDecoder（new StringSink（decodedKey）））; 
 memcpy（key，decodedKey.data（），decodedKey.length（））; 
 CryptoPP :: AES :: Encryption aesEncryption（key，AES :: MAX_KEYLENGTH）; 
 CryptoPP :: CBC_Mode_ExternalCipher :: Encryption cbcEncryption（aesEncryption，iv）; 
 
 CryptoPP :: StreamTransformationFilter stfEncryptor（cbcEncryption，new CryptoPP :: StringSink（ciphertext））; 
 stfEncryptor.Put（reinterpret_cast< const unsigned char *>（plain.c_str（）），plain.length（）+ 1）; 
 stfEncryptor.MessageEnd（）; 
 StringSource ss（ciphertext，true，new HexEncoder（new StringSink（ciphertextEncode）））; 
 cout<< \\\
encrypted text：<< ciphertextEncode; 
 return ciphertextEncode; 
}

解密：

  string CryptoAES :: Decrypt（string cipher，string strkey）{
 cout<<\\\
cipher text：<密码
 cout<< \\\
 key to decrypt：<<< strkey; 
 byte key [AES :: MAX_KEYLENGTH]; 
 memcpy（key，strkey.data（），strkey.length（））; 
 string encodedKey，decodedKey，ciphertextDecode，decryptptedtext; 
 encodedKey.clear（）; 
 decodedKey.clear（）; 
 ciphertextDecode.clear（）; 
 decryptptedtext.clear（）; 
 StringSource（key，sizeof（key），true，new HexEncoder（new StringSink（encodedKey）））; 
 StringSource ssk（encodedKey，true，new HexDecoder（new StringSink（decodedKey）））; 
 memcpy（key，decodedKey.data（），decodedKey.length（））; 
 StringSource ss（cipher，true，new HexDecoder（new StringSink（ciphertextDecode）））; 
 CryptoPP :: AES :: Decryption aesDecryption（key，AES :: MAX_KEYLENGTH）; 
 CryptoPP :: CBC_Mode_ExternalCipher :: Decryption cbcDecryption（aesDecryption，iv）; 
 
 CryptoPP :: StreamTransformationFilter stfDecryptor（cbcDecryption，新CryptoPP :: StringSink（decryptedtext））; 
 stfDecryptor.Put（reinterpret_cast的< const的无符号字符*>（ciphertextDecode.c_str（）），ciphertextDecode.size（））; 
 stfDecryptor.MessageEnd（）; 
 
 cout<<\\\
decrypted text：<< 
 return decryptedtext; 
}

结果：

 纯文本：F7ACA191B43AFAF85277DD196FE0441CB7C0901BEC33CB9F38FFAA54CBF219B9 
键加密：123456 
加密后的文本：6FC1BF3108B0590367E6449B6E615CACFDF4DE16EDD05742C873EE4E8A16BA9EC0B8EFAD800F466EE9A6F75202C8800CF4CBDD2620956020D5B0A6A9A8DCEA9EDB5C470527423ACBEEDD0A9C59916C8B 
密文：6FC1BF3108B0590367E6449B6E615CACFDF4DE16EDD05742C873EE4E8A16BA9EC0B8EFAD800F466EE9A6F75202C8800CF4CBDD2620956020D5B0A6A9A8DCEA9EDB5C470527423ACBEEDD0A9C59916C8B 
密钥来解密：123456 
解密文本：F7ACA191B43AFAF85277DD196FE0441CB7C0901BEC33CB9F38FFAA54CBF219B9 
密文：6FC1BF3108B0590367E6449B6E615CACFDF4DE16EDD05742C873EE4E8A16BA9EC0B8EFAD800F466EE9A6F75202C8800CF4CBDD2620956020D5B0A6A9A8DCEA9EDB5C470527423ACBEEDD0A9C59916C8B 
密钥来解密：123456 
例外代理服务器！ （
 Error：StreamTransformationFilter：invalid PKCS＃7 block padding

编辑＃
这里是新版本的方法：



IV：

  for（int i = 0; i  iv [i] = 0;

加密：

  string CryptoAES :: Encrypt（string plain，string strkey）{ 
 
 byte key [AES :: MAX_KEYLENGTH]; 
 byte * k =（byte *）strkey.c_str（）; 
 
 for（int i = 0; i <= AES_MAX_KEYLENGTH; i ++）
 if（i  key [i] = k [i]; 
 else 
 key [i] = 0; 
串ciphertextEncode，密文; 
 COUT<<\\\
plain文字：<<平原; 
 COUT<<\\\
密钥来加密：<<钥匙; 
 ciphertextEncode.clear（）; 
 ciphertext.clear（）; 
 CryptoPP :: AES加密:: aesEncryption（键，AES :: MAX_KEYLENGTH）; 
 CryptoPP :: CBC_Mode_ExternalCipher :: Encryption cbcEncryption（aesEncryption，iv）; 
 
 CryptoPP :: StreamTransformationFilter stfEncryptor（cbcEncryption，new CryptoPP :: StringSink（ciphertext））; 
 stfEncryptor.Put（reinterpret_cast< const unsigned char *>（plain.c_str（）），plain.length（）+ 1）; 
 stfEncryptor.MessageEnd（）; 
 cout<< \\\
encrypted text：<< ciphertext; 
 StringSource ss（ciphertext，true，new HexEncoder（new StringSink（ciphertextEncode）））; 
 cout<< \\\
encoded encrypted text：<< ciphertextEncode; 
 return ciphertextEncode; 
}

解密：

  string CryptoAES :: Decrypt（string cipher，string strkey）{
 
 byte key [AES :: MAX_KEYLENGTH]; 
 byte * k =（byte *）strkey.c_str（）; 
 
的for（int i = 0; I< AES :: MAX_KEYLENGTH;我++）
如果（I<的sizeof（K））
键[i] = K [我]; 
 else 
 key [i] = 0; 
 string ciphertextDecode，decryptptedtext; 
 cout<<\\\
cipher text：<<密码
 cout<< \\\
 key to decrypt：<< key; 
 ciphertextDecode.clear（）; 
 decryptptedtext.clear（）; 
 
 StringSource ss（cipher，true，new HexDecoder（new StringSink（ciphertextDecode）））; 
 cout<< \\\
 cipher decoded：<密文解码; 
 CryptoPP :: AES :: Decryption aesDecryption（key，AES :: MAX_KEYLENGTH）; 
 CryptoPP :: CBC_Mode_ExternalCipher :: Decryption cbcDecryption（aesDecryption，iv）; 
 
 CryptoPP :: StreamTransformationFilter stfDecryptor（cbcDecryption，新CryptoPP :: StringSink（decryptedtext））; 
 stfDecryptor.Put（reinterpret_cast的< const的无符号字符*>（ciphertextDecode.c_str（）），ciphertextDecode.size（））; 
 stfDecryptor.MessageEnd（）; 
 
 cout<<\\\
decrypted text：<< 
 return decryptedtext; 
}

结果：

 纯文本：0C469BEA09DFCAC0A555E74175F1A614F471A5205FEB13A72C2DFFE8C4B52AA4 
键加密：123456 
加密后的文本：z_d0kߨ    ^G o   zL  Z  fc L  X   ，< X *-R_  x  ？  U$ 
编码的加密文字：D8F68E8E8B7AADB094A5BD5FC117BFBA648130E46BDFA8B6DD0EA35E17478F6FA01AA38E0417B4087A4CAEBB5AB8C466639C4C84F35895C07FB2172C3C582A2D525FFDDC78A9F83FEFA50913E55524C1 
密文：D8F68E8E8B7AADB094A5BD5FC117BFBA648130E46BDFA8B6DD0EA35E17478F6FA01AA38E0417B4087A4CAEBB5AB8C466639C4C84F35895C07FB2172C3C582A2D525FFDDC78A9F83FEFA50913E55524C1 
密钥来解密：123456 
密码解码：z_d0kߨ^ GozLZfcLX，< X * -R_x U $ 
解密文本：0C469BEA09DFCAC0A555E74175F1A614F471A5205FEB13A72C2DFFE8C4B52AA4 
密文：D8F68E8E8B7AADB094A5BD5FC117BFBA648130E46BDFA8B6DD0EA35E17478F6FA01AA38E0417B4087A4CAEBB5AB8C466639C4C84F35895C07FB2172C3C582A2D525FFDDC78A9F83FEFA50913E55524C1 
密钥来解密：123456 
密码解码：z_d0kߨ^围棋  zL  Z  fc L  X   ，< X *-R_  x  ？  U$ 
代理服务器中的异常！ :( 
 StreamTransformationFilter：无效的PKCS＃7块填充发现


解决方案



code>字符串密码和字符串strkey 有 \0 填充。



秒：



iv [16] / code>这两个方法之间的共享值，改变了！所以我在每个方法中设置它。


I want to use AES-256 encryption/decryption in my C++ code to do that I use cryptoPP library, I have implement encryption and decryption. but I get Error : StreamTransformationFilter: invalid PKCS #7 block padding found Error.

The senario which I test is :

First I encrypt myplaintext then decrypt it --> there is no error here.

Second I decrypt the cipher created above --> here I got the error.

I know that there are same question here but I couldn't solve my problem :(

Here I set iv:

byte iv[16];
string strIv = "162169848599E7C792BF58BFA53D88E6";
memcpy(iv, strIv.data(), strIv.length());

Encryption:

string CryptoAES::Encrypt(string plain, string strkey) {
    cout << "\nplain text :" << plain;
    cout << "\n key to encrypt: " <<strkey;
    byte key[AES::MAX_KEYLENGTH];
    memcpy(key, strkey.data(), strkey.length());
    string encodedKey, decodedKey,ciphertextEncode,ciphertext;
    encodedKey.clear();
    decodedKey.clear();
    ciphertextEncode.clear();
    ciphertext.clear();
    StringSource(key, sizeof (key), true, new HexEncoder(new StringSink(encodedKey))); 
    StringSource ssk(encodedKey, true, new HexDecoder(new StringSink(decodedKey)));
    memcpy(key, decodedKey.data(), decodedKey.length());
    CryptoPP::AES::Encryption aesEncryption(key, AES::MAX_KEYLENGTH);
    CryptoPP::CBC_Mode_ExternalCipher::Encryption cbcEncryption(aesEncryption, iv);

    CryptoPP::StreamTransformationFilter stfEncryptor(cbcEncryption, new CryptoPP::StringSink(ciphertext));
    stfEncryptor.Put(reinterpret_cast<const unsigned char*> (plain.c_str()), plain.length() + 1);
    stfEncryptor.MessageEnd();
    StringSource ss(ciphertext, true, new HexEncoder(new StringSink(ciphertextEncode)));
    cout << "\nencrypted text: " <<ciphertextEncode;
    return ciphertextEncode;
}

Decryption:

string CryptoAES::Decrypt(string cipher, string strkey) {
    cout <<"\ncipher text : "<< cipher;
    cout << "\n key to decrypt: " <<strkey;
    byte key[AES::MAX_KEYLENGTH];
    memcpy(key, strkey.data(), strkey.length());
    string encodedKey, decodedKey,ciphertextDecode,decryptedtext;
    encodedKey.clear();
    decodedKey.clear();
    ciphertextDecode.clear();
    decryptedtext.clear();
    StringSource(key, sizeof (key), true, new HexEncoder(new StringSink(encodedKey))); 
    StringSource ssk(encodedKey, true, new HexDecoder(new StringSink(decodedKey)));
    memcpy(key, decodedKey.data(), decodedKey.length());
    StringSource ss(cipher, true, new HexDecoder(new StringSink(ciphertextDecode)));
    CryptoPP::AES::Decryption aesDecryption(key, AES::MAX_KEYLENGTH);
    CryptoPP::CBC_Mode_ExternalCipher::Decryption cbcDecryption(aesDecryption, iv);

    CryptoPP::StreamTransformationFilter stfDecryptor(cbcDecryption, new CryptoPP::StringSink(decryptedtext));
    stfDecryptor.Put(reinterpret_cast<const unsigned char*> (ciphertextDecode.c_str()), ciphertextDecode.size());
    stfDecryptor.MessageEnd();

    cout <<"\ndecrypted text: "<<decryptedtext;
    return decryptedtext;
}

result :

plain text :F7ACA191B43AFAF85277DD196FE0441CB7C0901BEC33CB9F38FFAA54CBF219B9
 key to encrypt: 123456
encrypted text: 6FC1BF3108B0590367E6449B6E615CACFDF4DE16EDD05742C873EE4E8A16BA9EC0B8EFAD800F466EE9A6F75202C8800CF4CBDD2620956020D5B0A6A9A8DCEA9EDB5C470527423ACBEEDD0A9C59916C8B
cipher text : 6FC1BF3108B0590367E6449B6E615CACFDF4DE16EDD05742C873EE4E8A16BA9EC0B8EFAD800F466EE9A6F75202C8800CF4CBDD2620956020D5B0A6A9A8DCEA9EDB5C470527423ACBEEDD0A9C59916C8B
 key to decrypt: 123456
decrypted text: F7ACA191B43AFAF85277DD196FE0441CB7C0901BEC33CB9F38FFAA54CBF219B9
cipher text : 6FC1BF3108B0590367E6449B6E615CACFDF4DE16EDD05742C873EE4E8A16BA9EC0B8EFAD800F466EE9A6F75202C8800CF4CBDD2620956020D5B0A6A9A8DCEA9EDB5C470527423ACBEEDD0A9C59916C8B                                                                                                    
 key to decrypt: 123456
exception in proxy server! :( 
    Error : StreamTransformationFilter: invalid PKCS #7 block padding found

EDIT #1: here is the new version of the methods:

IV:

for (int i = 0; i < AES::BLOCKSIZE; i++)
        iv[i] = 0;

encryption:

string CryptoAES::Encrypt(string plain, string strkey) {

    byte key[AES::MAX_KEYLENGTH];
    byte* k = (byte*) strkey.c_str();

    for (int i = 0; i < AES::MAX_KEYLENGTH; i++)
        if (i<sizeof (k))
            key[i] = k[i];
        else
            key[i] = 0;
    string ciphertextEncode,ciphertext;
    cout << "\nplain text :" << plain;
    cout << "\n key to encrypt: " <<key;
    ciphertextEncode.clear();
    ciphertext.clear();
    CryptoPP::AES::Encryption aesEncryption(key, AES::MAX_KEYLENGTH);
    CryptoPP::CBC_Mode_ExternalCipher::Encryption cbcEncryption(aesEncryption, iv);

    CryptoPP::StreamTransformationFilter stfEncryptor(cbcEncryption, new CryptoPP::StringSink(ciphertext));
    stfEncryptor.Put(reinterpret_cast<const unsigned char*> (plain.c_str()), plain.length() + 1);
    stfEncryptor.MessageEnd();
    cout << "\nencrypted text: " <<ciphertext;
    StringSource ss(ciphertext, true, new HexEncoder(new StringSink(ciphertextEncode)));
    cout << "\nencoded encrypted text: " <<ciphertextEncode;
    return ciphertextEncode;
}

Decryption:

string CryptoAES::Decrypt(string cipher, string strkey) {

    byte key[AES::MAX_KEYLENGTH];
    byte* k = (byte*) strkey.c_str();

    for (int i = 0; i < AES::MAX_KEYLENGTH; i++)
        if (i<sizeof (k))
            key[i] = k[i];
        else
            key[i] = 0;
    string ciphertextDecode,decryptedtext;
    cout <<"\ncipher text : "<< cipher;
    cout << "\n key to decrypt: " <<key;
    ciphertextDecode.clear();
    decryptedtext.clear();

    StringSource ss(cipher, true, new HexDecoder(new StringSink(ciphertextDecode)));
    cout << "\n cipher decoded: " << ciphertextDecode;
    CryptoPP::AES::Decryption aesDecryption(key, AES::MAX_KEYLENGTH);
    CryptoPP::CBC_Mode_ExternalCipher::Decryption cbcDecryption(aesDecryption, iv);

    CryptoPP::StreamTransformationFilter stfDecryptor(cbcDecryption, new CryptoPP::StringSink(decryptedtext));
    stfDecryptor.Put(reinterpret_cast<const unsigned char*> (ciphertextDecode.c_str()), ciphertextDecode.size());
    stfDecryptor.MessageEnd();

    cout <<"\ndecrypted text: "<<decryptedtext;
    return decryptedtext;
}

result:

plain text :0C469BEA09DFCAC0A555E74175F1A614F471A5205FEB13A72C2DFFE8C4B52AA4
 key to encrypt: 123456
encrypted text: �����z�����_���d�0�kߨ���^G�o���zL��Z��fc�L��X���,<X*-R_��x��?�  �U$�
encoded encrypted text: D8F68E8E8B7AADB094A5BD5FC117BFBA648130E46BDFA8B6DD0EA35E17478F6FA01AA38E0417B4087A4CAEBB5AB8C466639C4C84F35895C07FB2172C3C582A2D525FFDDC78A9F83FEFA50913E55524C1
cipher text : D8F68E8E8B7AADB094A5BD5FC117BFBA648130E46BDFA8B6DD0EA35E17478F6FA01AA38E0417B4087A4CAEBB5AB8C466639C4C84F35895C07FB2172C3C582A2D525FFDDC78A9F83FEFA50913E55524C1
 key to decrypt: 123456
 cipher decoded: �����z�����_���d�0�kߨ���^G�o���zL��Z��fc�L��X���,<X*-R_��x��?� �U$�
decrypted text: 0C469BEA09DFCAC0A555E74175F1A614F471A5205FEB13A72C2DFFE8C4B52AA4
cipher text : D8F68E8E8B7AADB094A5BD5FC117BFBA648130E46BDFA8B6DD0EA35E17478F6FA01AA38E0417B4087A4CAEBB5AB8C466639C4C84F35895C07FB2172C3C582A2D525FFDDC78A9F83FEFA50913E55524C1                                                                                               
 key to decrypt: 123456
 cipher decoded: �����z�����_���d�0�kߨ���^G�o���zL��Z��fc�L��X���,<X*-R_��x��?� �U$�
exception in proxy server! :( 
    StreamTransformationFilter: invalid PKCS #7 block padding found

解决方案

Finally I solved the problems.

first:

string cipher and string strkey have \0 padding.

second:

The iv[16] value which was share between two methods, is changed! so I set it in each methods.

这篇关于StreamTransformationFilter：AES解密中找到的无效的PKCS＃7块填充的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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