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| Discusses symmetric encryption key generation techniques for block encryption algorithms such as AES, Blowfish, and Twofish, or for other algorithms such as ChaCha20.
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Encrypt, decrypt and generate a key in C# using AES256.
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Encryption Key Example
encryption.cs
#regionEncryption |
/// <summary> |
/// Generate a private key |
/// From : www.chapleau.info/blog/2011/01/06/usingsimplestringkeywithaes256encryptioninc.html |
/// </summary> |
privatestaticstringGenerateKey(intiKeySize) |
{ |
RijndaelManagedaesEncryption=newRijndaelManaged(); |
aesEncryption.KeySize=iKeySize; |
aesEncryption.BlockSize=128; |
aesEncryption.Mode=CipherMode.CBC; |
aesEncryption.Padding=PaddingMode.PKCS7; |
aesEncryption.GenerateIV(); |
stringivStr=Convert.ToBase64String(aesEncryption.IV); |
aesEncryption.GenerateKey(); |
stringkeyStr=Convert.ToBase64String(aesEncryption.Key); |
stringcompleteKey=ivStr+','+keyStr; |
returnConvert.ToBase64String(ASCIIEncoding.UTF8.GetBytes(completeKey)); |
} |
/// <summary> |
/// Encrypt |
/// From : www.chapleau.info/blog/2011/01/06/usingsimplestringkeywithaes256encryptioninc.html |
/// </summary> |
privatestaticstringEncrypt(stringiPlainStr, stringiCompleteEncodedKey, intiKeySize) |
{ |
RijndaelManagedaesEncryption=newRijndaelManaged(); |
aesEncryption.KeySize=iKeySize; |
aesEncryption.BlockSize=128; |
aesEncryption.Mode=CipherMode.CBC; |
aesEncryption.Padding=PaddingMode.PKCS7; |
aesEncryption.IV=Convert.FromBase64String(ASCIIEncoding.UTF8.GetString(Convert.FromBase64String(iCompleteEncodedKey)).Split(',')[0]); |
aesEncryption.Key=Convert.FromBase64String(ASCIIEncoding.UTF8.GetString(Convert.FromBase64String(iCompleteEncodedKey)).Split(',')[1]); |
byte[] plainText=ASCIIEncoding.UTF8.GetBytes(iPlainStr); |
ICryptoTransformcrypto=aesEncryption.CreateEncryptor(); |
byte[] cipherText=crypto.TransformFinalBlock(plainText, 0, plainText.Length); |
returnConvert.ToBase64String(cipherText); |
} |
/// <summary> |
/// Decrypt |
/// From : www.chapleau.info/blog/2011/01/06/usingsimplestringkeywithaes256encryptioninc.html |
/// </summary> |
privatestaticstringDecrypt(stringiEncryptedText, stringiCompleteEncodedKey, intiKeySize) |
{ |
RijndaelManagedaesEncryption=newRijndaelManaged(); |
aesEncryption.KeySize=iKeySize; |
aesEncryption.BlockSize=128; |
aesEncryption.Mode=CipherMode.CBC; |
aesEncryption.Padding=PaddingMode.PKCS7; |
aesEncryption.IV=Convert.FromBase64String(ASCIIEncoding.UTF8.GetString(Convert.FromBase64String(iCompleteEncodedKey)).Split(',')[0]); |
aesEncryption.Key=Convert.FromBase64String(ASCIIEncoding.UTF8.GetString(Convert.FromBase64String(iCompleteEncodedKey)).Split(',')[1]); |
ICryptoTransformdecrypto=aesEncryption.CreateDecryptor(); |
byte[] encryptedBytes=Convert.FromBase64CharArray(iEncryptedText.ToCharArray(), 0, iEncryptedText.Length); |
returnASCIIEncoding.UTF8.GetString(decrypto.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length)); |
} |
#endregion |
commented Jun 6, 2014
hi fairly new to the cryptography.. when im implementing the above code im getting a error while decrypting. 'Padding is invalid and cannot be removed.' please suggest a resolution thanks and regards |
commented Oct 9, 2017 • edited
edited
How-to save -safely- the private key ? Windows registry ? in disk ? I use ASP.NET applications. Test your code |
C# Generate Random Encryption Key
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