使用TDES加密和解密时的数据不正确 [英] Bad Data when Encrypt and Decrypt with TDES
本文介绍了使用TDES加密和解密时的数据不正确的处理方法，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
当解密中的READ函数从加密异常中得到坏数据时。 （我用注释标记行）
生成和加密字符串：
public void MssGenerateKeyPair（string ssSymmetricKey，out string ssCipheredKeyPair，out string ssPublicKey）{
ssCipheredKeyPair = string.Empty;
ssPublicKey = string.Empty;
//对称密钥是用户签名密码的哈希值
SHA1CryptoServiceProvider sha1 = new SHA1CryptoServiceProvider（）;
byte [] tempKey = sha1.ComputeHash（Encoding.UTF8.GetBytes（ssSymmetricKey））;
byte [] key = new byte [24];
tempKey.CopyTo（key，0）;
//如果对称密钥为< 24
for（int index = 0，i = tempKey.Length; i< key.Length; index ++，i ++）
{
key [i] = tempKey [index];
}
//定义对称加密数据
TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider（）;
tdes.Key = key;
tdes.IV =新字节[8];
tdes.Mode = CipherMode.CBC;
tdes.Padding = PaddingMode.PKCS7;
// define assymetric stuff
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider（）;
MemoryStream memoryStream = new MemoryStream（）;
CryptoStream cryptoStream = new CryptoStream（memoryStream，tdes.CreateEncryptor（），CryptoStreamMode.Write）;
byte [] toChipher = Encoding.UTF8.GetBytes（rsa.ToXmlString（true））;
cryptoStream.Write（toChipher，0，toChipher.Length）;
byte [] cipheredKeyPair = memoryStream.ToArray（）;
ssCipheredKeyPair = Convert.ToBase64String（cipheredKeyPair）;
ssPublicKey = rsa.ToXmlString（false）;
cryptoStream.Close（）;
memoryStream.Close（）;
} // MssGenerateKeyPair
解密字符串
public void MssSignData（string ssSymmetricKey，byte [] ssDataToSign，byte [] ssCipheredKeyPair，out byte [] ssSignature，out byte [] ssSignedData）{
ssSignature = new byte [] {};
ssSignedData = new byte [] {};
//对称密钥是用户签名密码的哈希值
SHA1CryptoServiceProvider sha1 = new SHA1CryptoServiceProvider（）;
byte [] tempKey = sha1.ComputeHash（Encoding.UTF8.GetBytes（ssSymmetricKey））;
byte [] key = new byte [24];
tempKey.CopyTo（key，0）;
//如果对称密钥为< 24
for（int index = 0，i = tempKey.Length; i< key.Length; index ++，i ++）
{
key [i] = tempKey [index];
}
//定义对称加密数据
TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider（）;
tdes.Key = key;
tdes.IV =新字节[8];
tdes.Mode = CipherMode.CBC;
tdes.Padding = PaddingMode.PKCS7;
MemoryStream memoryStream = new MemoryStream（ssCipheredKeyPair）;
CryptoStream cryptoStream = new CryptoStream（memoryStream，tdes.CreateDecryptor（），CryptoStreamMode.Read）;
MemoryStream plainMemoryStream = new MemoryStream（）;
byte [] tempPlainBytes = new byte [1024];
int read = 0;
int totalRead = 0;
do
{
// ################################# ##############################
//以下命令中的错误
// ### ################################################## ###########
read = cryptoStream.Read（tempPlainBytes，0，tempPlainBytes.Length）;
totalRead + = read;
plainMemoryStream.Write（tempPlainBytes，0，read）;
} while（read> 0）;
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider（）;
rsa.FromXmlString（Encoding.UTF8.GetString（plainMemoryStream.ToArray（）））;
ssSignature = rsa.SignData（ssDataToSign，new SHA1CryptoServiceProvider（））;
ssSignedData = ssDataToSign;
cryptoStream.Close（）;
memoryStream.Close（）;
plainMemoryStream.Close（）;
} // MssSignData
要测试的代码
private void button1_Click（object sender，EventArgs e）
{
string key;
string pkey;
byte [] sig;
byte [] avs;
OutSystems.NssPseudoCertificates.CssPseudoCertificates c = new OutSystems.NssPseudoCertificates.CssPseudoCertificates（）;
c.MssGenerateKeyPair（xpto，out key，out pkey）;
c.MssSignString（xpto，hello，key，out sig，out avs）;
}
解决方案
p>像Marvin Smit在他的评论中说的：添加齐平，我做了，工作！
积分转到他！
I'm encrypting a big string with TDES and trying to decrypt it. Can't understand what's is wrong. When it does the READ function in decryption I get "Bad Data" from the Cryptographic Exception. (I marked the line with comments)
To generate and encrypt the string:
public void MssGenerateKeyPair(string ssSymmetricKey, out string ssCipheredKeyPair, out string ssPublicKey) {
ssCipheredKeyPair = string.Empty;
ssPublicKey = string.Empty;
//Symmetric key is the hash of user's signing password
SHA1CryptoServiceProvider sha1 = new SHA1CryptoServiceProvider();
byte[] tempKey = sha1.ComputeHash(Encoding.UTF8.GetBytes(ssSymmetricKey));
byte[] key = new byte[24];
tempKey.CopyTo(key, 0);
//if symmetric keys is < 24
for (int index = 0, i = tempKey.Length; i < key.Length; index++, i++)
{
key[i] = tempKey[index];
}
//define symmetric encryption data
TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
tdes.Key = key;
tdes.IV = new byte[8];
tdes.Mode = CipherMode.CBC;
tdes.Padding = PaddingMode.PKCS7;
//define assymetric stuff
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
MemoryStream memoryStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream(memoryStream, tdes.CreateEncryptor(), CryptoStreamMode.Write);
byte[] toChipher = Encoding.UTF8.GetBytes(rsa.ToXmlString(true));
cryptoStream.Write(toChipher, 0, toChipher.Length);
byte[] cipheredKeyPair = memoryStream.ToArray();
ssCipheredKeyPair = Convert.ToBase64String(cipheredKeyPair);
ssPublicKey = rsa.ToXmlString(false);
cryptoStream.Close();
memoryStream.Close();
} // MssGenerateKeyPair
To decrypt the string
public void MssSignData(string ssSymmetricKey, byte[] ssDataToSign, byte[] ssCipheredKeyPair, out byte[] ssSignature, out byte[] ssSignedData) {
ssSignature = new byte[] {};
ssSignedData = new byte[] {};
//Symmetric key is the hash of user's signing password
SHA1CryptoServiceProvider sha1 = new SHA1CryptoServiceProvider();
byte[] tempKey = sha1.ComputeHash(Encoding.UTF8.GetBytes(ssSymmetricKey));
byte[] key = new byte[24];
tempKey.CopyTo(key, 0);
//if symmetric keys is < 24
for (int index = 0, i = tempKey.Length; i < key.Length; index++, i++)
{
key[i] = tempKey[index];
}
//define symmetric encryption data
TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
tdes.Key = key;
tdes.IV = new byte[8];
tdes.Mode = CipherMode.CBC;
tdes.Padding = PaddingMode.PKCS7;
MemoryStream memoryStream = new MemoryStream(ssCipheredKeyPair);
CryptoStream cryptoStream = new CryptoStream(memoryStream, tdes.CreateDecryptor(), CryptoStreamMode.Read);
MemoryStream plainMemoryStream = new MemoryStream();
byte[] tempPlainBytes = new byte[1024];
int read = 0;
int totalRead = 0;
do
{
//################################################################
//ERROR IN THE FOLLOWING LINE
//################################################################
read = cryptoStream.Read(tempPlainBytes, 0, tempPlainBytes.Length);
totalRead += read;
plainMemoryStream.Write(tempPlainBytes, 0, read);
} while (read > 0);
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
rsa.FromXmlString(Encoding.UTF8.GetString(plainMemoryStream.ToArray()));
ssSignature = rsa.SignData(ssDataToSign, new SHA1CryptoServiceProvider());
ssSignedData = ssDataToSign;
cryptoStream.Close();
memoryStream.Close();
plainMemoryStream.Close();
} // MssSignData
Code to test
private void button1_Click(object sender, EventArgs e)
{
string key;
string pkey;
byte[] sig;
byte[] avs;
OutSystems.NssPseudoCertificates.CssPseudoCertificates c = new OutSystems.NssPseudoCertificates.CssPseudoCertificates();
c.MssGenerateKeyPair("xpto",out key, out pkey);
c.MssSignString("xpto", "hello", key, out sig, out avs);
}
解决方案
Like Marvin Smit said in his comments: to add the flush, I did it and worked! Credits go to him!
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