Created
March 13, 2021 10:19
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Decrypts cipher text Aes
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/// <summary> | |
/// Decrypts the cipher text. | |
/// </summary> | |
/// <param name="cipherText"></param> | |
/// <param name="Key"></param> | |
/// <param name="IV"></param> | |
/// <returns></returns> | |
static string DecryptStringFromBytes_Aes(byte[] cipherText, byte[] Key, byte[] IV) | |
{ | |
// Check arguments. | |
if (cipherText == null || cipherText.Length <= 0) | |
throw new ArgumentNullException("cipherText"); | |
if (Key == null || Key.Length <= 0) | |
throw new ArgumentNullException("Key"); | |
if (IV == null || IV.Length <= 0) | |
throw new ArgumentNullException("IV"); | |
// Declare the string used to hold | |
// the decrypted text. | |
string plaintext = null; | |
// Create an AesCryptoServiceProvider object | |
// with the specified key and IV. | |
using (AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider()) | |
{ | |
aesAlg.Key = Key; | |
aesAlg.IV = IV; | |
// Create a decryptor to perform the stream transform. | |
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV); | |
// Create the streams used for decryption. | |
using (MemoryStream msDecrypt = new MemoryStream(cipherText)) | |
{ | |
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)) | |
{ | |
using (StreamReader srDecrypt = new StreamReader(csDecrypt)) | |
{ | |
// Read the decrypted bytes from the decrypting stream | |
// and place them in a string. | |
plaintext = srDecrypt.ReadToEnd(); | |
} | |
} | |
} | |
} | |
return plaintext; | |
} |
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