| public Decrypt ( byte data, RSAEncryptionPadding padding ) : byte[] | ||
| data | byte | |
| padding | RSAEncryptionPadding | |
| return | byte[] | |
/// <summary>
/// Decrypts a string (previously encrypted with the Encrypt method)
/// </summary>
/// <param name="base64String">The encrypted string</param>
/// <param name="privateKey">The private key used to decrypt the string</param>
/// <returns>A string containing the decrypted value</returns>
public string Decrypt(string base64String, System.Security.Cryptography.RSAParameters privateKey)
{
string result = null;
try
{
_rsa.ImportParameters(privateKey);
int base64BlockSize = (256 % 3 != 0) ? ((256 / 3) * 4) + 4 : (256 / 3) * 4;
int iterations = base64String.Length / base64BlockSize;
int l = 0;
var fullbytes = new byte[0];
for (int i = 0; i < iterations; i++)
{
byte[] encBytes = Convert.FromBase64String(base64String.Substring(base64BlockSize * i, base64BlockSize));
byte[] bytes = _rsa.Decrypt(encBytes, System.Security.Cryptography.RSAEncryptionPadding.Pkcs1);
Array.Resize(ref fullbytes, fullbytes.Length + bytes.Length);
foreach (byte t in bytes)
{
fullbytes[l] = t;
l++;
}
}
result = fullbytes.AsString();// Encoding.UTF32.GetString(fullbytes);
}
catch (Exception e)
{
Log.e(e);
}
return(result);
}
public string Decrypt(string cipherText)
{
if (_privateKeyRsaProvider == null)
{
throw new Exception("_privateKeyRsaProvider is null");
}
return(System.Text.Encoding.UTF8.GetString(_privateKeyRsaProvider.Decrypt(Convert.FromBase64String(cipherText), RSAEncryptionPadding.Pkcs1)));
}
public static LongRSACryptKey GetLongRSACryptKeyFromEncryptedAES(ReadOnlySpan <Byte> encryptedkey, ReadOnlySpan <Byte> encryptediv,
ReadOnlySpan <Byte> privatekey, RSAKeyType type = Cryptography.RSA.DefaultRSAKeyType, RSAParameters?parameters = null)
{
Rsa rsa = Cryptography.RSA.Create(privatekey, type, parameters);
ReadOnlySpan <Byte> key = rsa.Decrypt(encryptedkey.ToArray());
ReadOnlySpan <Byte> iv = rsa.Decrypt(encryptediv.ToArray());
return(new LongRSACryptKey(key, iv));
}
public string Decrypt(string cryptoText)
{
byte[] encryptedData = Convert.FromBase64String(cryptoText);
byte[] data = rsa.Decrypt(encryptedData, RSAEncryptionPadding.Pkcs1);
var text = byteConverter.GetString(data);
return(text);
}
public string Decrypt(string cipherText)
{
if (_privateKeyRsaProvider == null)
{
return(null);
}
return(Encoding.UTF8.GetString(_privateKeyRsaProvider.Decrypt(Convert.FromBase64String(cipherText), RSAEncryptionPadding.Pkcs1)));
}
public byte[] Decrypt(byte[] rgb, bool fOAEP)
{
if (rgb == null)
throw new ArgumentNullException(nameof(rgb));
// size check -- must be at most the modulus size
if (rgb.Length > (KeySize / 8))
throw new CryptographicException(SR.Format(SR.Cryptography_Padding_DecDataTooBig, Convert.ToString(KeySize / 8)));
return _impl.Decrypt(rgb, fOAEP ? RSAEncryptionPadding.OaepSHA1 : RSAEncryptionPadding.Pkcs1);
}
/// <summary>
/// 解密
/// </summary>
/// <param name="rsa"></param>
/// <param name="encryptedData"></param>
/// <param name="padding"></param>
/// <returns></returns>
private static byte[] Decrypt(System.Security.Cryptography.RSA rsa, byte[] encryptedData, RSAEncryptionPadding padding = null)
{
padding ??= RSAEncryptionPadding.Pkcs1;
byte[] result;
var step = rsa.KeySize / 8;
// 长数据分割
if (step != encryptedData.Length)
{
var pointer = 0;
var resBytes = new List <byte>();
while (pointer < encryptedData.Length)
{
resBytes.AddRange(rsa.Decrypt(encryptedData.Skip(pointer).Take(step).ToArray(), padding));
pointer += step;
}
result = resBytes.ToArray();
}
else
{
result = rsa.Decrypt(encryptedData, padding);
}
return(result);
}
[System.Security.SecuritySafeCritical] // auto-generated
public override byte[] DecryptKeyExchange(byte[] rgbData)
{
if (_rsaKey == null)
{
throw new CryptographicUnexpectedOperationException(Environment.GetResourceString("Cryptography_MissingKey"));
}
if (OverridesDecrypt)
{
return(_rsaKey.Decrypt(rgbData, RSAEncryptionPadding.OaepSHA1));
}
else
{
return(Utils.RsaOaepDecrypt(_rsaKey, SHA1.Create(), new PKCS1MaskGenerationMethod(), rgbData));
}
}
//
// public methods
//
public override byte[] DecryptKeyExchange(byte[] rgbIn)
{
if (_rsaKey == null)
{
throw new CryptographicUnexpectedOperationException(Environment.GetResourceString("Cryptography_MissingKey"));
}
byte[] rgbOut;
if (OverridesDecrypt)
{
rgbOut = _rsaKey.Decrypt(rgbIn, RSAEncryptionPadding.Pkcs1);
}
else
{
int i;
byte[] rgb;
rgb = _rsaKey.DecryptValue(rgbIn);
//
// Expected format is:
// 00 || 02 || PS || 00 || D
// where PS does not contain any zeros.
//
for (i = 2; i < rgb.Length; i++)
{
if (rgb[i] == 0)
{
break;
}
}
if (i >= rgb.Length)
{
throw new CryptographicUnexpectedOperationException(Environment.GetResourceString("Cryptography_PKCS1Decoding"));
}
i++; // Skip over the zero
rgbOut = new byte[rgb.Length - i];
Buffer.InternalBlockCopy(rgb, i, rgbOut, 0, rgbOut.Length);
}
return(rgbOut);
}
public static string DecryptFromJsEncrypt(string encryptString, String key)
{
#region Java RSA/ECB/PKCS1Padding加密方式
System.Security.Cryptography.RSA rsa = System.Security.Cryptography.RSA.Create();
RSAParameters para = new RSAParameters();
byte[] b1 = null;
byte[] b2 = null;
ResolveKey(key, out b1, out b2);
para.Modulus = b2;
para.D = b1;
para.Exponent = Convert.FromBase64String(GlobalConfig.exponent);
para.DP = Convert.FromBase64String(GlobalConfig.dp);
para.DQ = Convert.FromBase64String(GlobalConfig.dq);
para.InverseQ = Convert.FromBase64String(GlobalConfig.inverseQ);
para.P = Convert.FromBase64String(GlobalConfig.pp);
para.Q = Convert.FromBase64String(GlobalConfig.q);
rsa.ImportParameters(para);
byte[] enBytes = rsa.Decrypt(BinaryHelper.HexStringToBinary(encryptString, 0, encryptString.Length), RSAEncryptionPadding.Pkcs1);
return(Encoding.UTF8.GetString(enBytes));
#endregion
}
public static byte[] DecryptFromBase64(System.Security.Cryptography.RSA rsa, string content, RSAEncryptionPadding padding)
{
var data = Convert.FromBase64String(content);
int KEYBIT = rsa.KeySize;
int decryptBlockSize = KEYBIT / 8;
List <byte> result = new List <byte>();
int total = data.Length;
int index = 0;
while (total > 0)
{
int read = Math.Min(decryptBlockSize, total);
total -= read;
byte[] bs = new byte[read];
Array.Copy(data, index, bs, 0, read);
bs = rsa.Decrypt(bs, padding);
result.AddRange(bs);
index += read;
}
return(result.ToArray());
}
public static string Decrypt(string encryptString, String key)
{
#region Java RSA/ECB/NoPadding加密方式
//byte[] b1;
//byte[] b2;
//ResolveKey(key, out b1, out b2);
//BigInteger biE = new BigInteger(b1);
//BigInteger biN = new BigInteger(b2);
//BigInteger biText = new BigInteger(GetBytes(encryptString), GetBytes(encryptString).Length);
//BigInteger biEnText = biText.modPow(biE, biN);
//string temp = System.Text.Encoding.UTF8.GetString(biEnText.getBytes());
//return temp;
#endregion
#region Java RSA/ECB/PKCS1Padding加密方式
//encryptString = WebUtility.UrlDecode(encryptString);
System.Security.Cryptography.RSA rsa = System.Security.Cryptography.RSA.Create();
RSAParameters para = new RSAParameters();
byte[] b1 = null;
byte[] b2 = null;
ResolveKey(key, out b1, out b2);
para.Modulus = b2;
para.D = b1;
para.Exponent = Convert.FromBase64String(GlobalConfig.exponent);
para.DP = Convert.FromBase64String(GlobalConfig.dp);
para.DQ = Convert.FromBase64String(GlobalConfig.dq);
para.InverseQ = Convert.FromBase64String(GlobalConfig.inverseQ);
para.P = Convert.FromBase64String(GlobalConfig.pp);
para.Q = Convert.FromBase64String(GlobalConfig.q);
rsa.ImportParameters(para);
byte[] enBytes = rsa.Decrypt(Convert.FromBase64String(encryptString), RSAEncryptionPadding.Pkcs1);
return(Encoding.UTF8.GetString(enBytes));
#endregion
}
/// <summary>
/// 解开Exponent加密的内容
/// </summary>
/// <param name="content"></param>
/// <returns></returns>
public byte[] Decrypt(byte[] content)
{
return(_rsa.Decrypt(content, System.Security.Cryptography.RSAEncryptionPadding.Pkcs1));
}
public static byte[] RSADecrypt(this byte[] data, RSA rsa)
{
return(rsa.Decrypt(data, RSAEncryptionPadding.Pkcs1));
}
public static byte[] Decrypt(byte[] data)
{
return(cryptor.Decrypt(data, RSAEncryptionPadding.Pkcs1));
}
public static Byte[] Decrypt(Byte[] data, Rsa rsa)
{
return(rsa.Decrypt(data));
}