c# - Length of the data to decrypt is invalid. CryptoStream decrypting a string -

i have encrypt , decrypt method works on 1 site when copying on site started error: length of data decrypt invalid. have had online , on of questions find here none of them seemed have fix works me

the code encrypts without issue not decrypt correctly. error occurs on line here

int decryptedbytecount = cryptostream.read(plaintextbytes,0, plaintextbytes.length); 

it string trying decrypt

here full decrypt method:

 public static string decrypt(string ciphertext)     {         string passphrase = "@not real pass";        // can string         string saltvalue = "@not real salt";        // can string         string hashalgorithm = "sha1";             // can "md5"         int passworditerations = 2;                  // can number         string initvector = "@1b2c3d4e5f6g7h8"; // must 16 bytes         int keysize = 256;                // can 192 or 128          // convert strings defining encryption key characteristics byte         // arrays. let assume strings contain ascii codes.         // if strings include unicode characters, use unicode, utf7, or utf8         // encoding.         byte[] initvectorbytes = encoding.ascii.getbytes(initvector);         byte[] saltvaluebytes = encoding.ascii.getbytes(saltvalue);          // convert our ciphertext byte array.         byte[] ciphertextbytes = convert.frombase64string(ciphertext);          // first, must create password, key          // derived. password generated specified          // passphrase , salt value. password created using         // specified hash algorithm. password creation can done in         // several iterations.         passwordderivebytes password = new passwordderivebytes(                                                         passphrase,                                                         saltvaluebytes,                                                         hashalgorithm,                                                         passworditerations);          // use password generate pseudo-random bytes encryption         // key. specify size of key in bytes (instead of bits).         byte[] keybytes = password.getbytes(keysize / 8);          // create uninitialized rijndael encryption object.         rijndaelmanaged symmetrickey = new rijndaelmanaged();          // reasonable set encryption mode cipher block chaining         // (cbc). use default options other symmetric key parameters.         symmetrickey.mode = ciphermode.cbc;          // generate decryptor existing key bytes , initialization          // vector. key size defined based on number of key          // bytes.         icryptotransform decryptor = symmetrickey.createdecryptor(keybytes,initvectorbytes);          // define memory stream used hold encrypted data.         memorystream memorystream = new memorystream(ciphertextbytes);          // define cryptographic stream (always use read mode encryption).         cryptostream cryptostream = new cryptostream(memorystream,                                                       decryptor,                                                       cryptostreammode.read);          // since @ point don't know size of decrypted data         // be, allocate buffer long enough hold ciphertext;         // plaintext never longer ciphertext.         byte[] plaintextbytes = new byte[ciphertextbytes.length];          // start decrypting.         int decryptedbytecount = cryptostream.read(plaintextbytes,                                                    0,                                                    plaintextbytes.length);          // close both streams.         memorystream.close();         cryptostream.close();          // convert decrypted data string.          // let assume original plaintext string utf8-encoded.         string plaintext = encoding.utf8.getstring(plaintextbytes,                                                    0,                                                    decryptedbytecount);          // return decrypted string.            return plaintext;     } } 

let me know if encryption method needed well

edit

as requested here encryption code:

public static string encrypt(string plaintext)     {         string passphrase = "@not real password";        // can string         string saltvalue = "@not real salt";        // can string         string hashalgorithm = "sha1";             // can "md5"         int passworditerations = 2;                  // can number         string initvector = "@1b2c3d4e5f6g7h8"; // must 16 bytes         int keysize = 256;                // can 192 or 128         // convert strings byte arrays.         // let assume strings contain ascii codes.         // if strings include unicode characters, use unicode, utf7, or utf8          // encoding.         byte[] initvectorbytes = encoding.ascii.getbytes(initvector);         byte[] saltvaluebytes = encoding.ascii.getbytes(saltvalue);          // convert our plaintext byte array.         // let assume plaintext contains utf8-encoded characters.         byte[] plaintextbytes = encoding.utf8.getbytes(plaintext);          // first, must create password, key derived.         // password generated specified passphrase ,          // salt value. password created using specified hash          // algorithm. password creation can done in several iterations.         passwordderivebytes password = new passwordderivebytes(                                                         passphrase,                                                         saltvaluebytes,                                                         hashalgorithm,                                                         passworditerations);          // use password generate pseudo-random bytes encryption         // key. specify size of key in bytes (instead of bits).         byte[] keybytes = password.getbytes(keysize / 8);          // create uninitialized rijndael encryption object.         rijndaelmanaged symmetrickey = new rijndaelmanaged();          // reasonable set encryption mode cipher block chaining         // (cbc). use default options other symmetric key parameters.         symmetrickey.mode = ciphermode.cbc;          // generate encryptor existing key bytes , initialization          // vector. key size defined based on number of key          // bytes.         icryptotransform encryptor = symmetrickey.createencryptor(                                                          keybytes,                                                          initvectorbytes);          // define memory stream used hold encrypted data.         memorystream memorystream = new memorystream();          // define cryptographic stream (always use write mode encryption).         cryptostream cryptostream = new cryptostream(memorystream,                                                      encryptor,                                                      cryptostreammode.write);         // start encrypting.         cryptostream.write(plaintextbytes, 0, plaintextbytes.length);          // finish encrypting.         cryptostream.flushfinalblock();          // convert our encrypted data memory stream byte array.         byte[] ciphertextbytes = memorystream.toarray();          // close both streams.         memorystream.close();         cryptostream.close();           // convert encrypted data base64-encoded string.         string ciphertext = convert.tobase64string(ciphertextbytes).tostring();          //ciphertext = ciphertext.replace("/", "");         //ciphertext = ciphertext.replace("\\", "");         // return encrypted string.         return ciphertext;     } 

just further bit of information, string trying decode 2 test examples 1008 , 1013, both of these failing during decryption

thanks

i not sure how you're encrypting string, can see you're using byte array of ascii values, going assume of encrypted characters being encrypted weird characters messing returned string, instance ' " ' cause string end, meaning string being returned may not of right length.

maybe show encryption method , can find out sure.