Generate Random Aes 256 Key C

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Static IV and random keys using aes-256-cbc. Ask Question. Are there any security risks in using a static IV if I generate a new random KEY for each set of data to.

Generate 256 Bit Key
Generate Random Aes 256 Key Chart
Generate Random Aes Key

Encrypt, decrypt and generate a key in C# using AES256.

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

In the beginning the two nodes will create a shared session key by using Deffie-Helman protocol, then one of them will genreate AES key and send it to the other node through the secure channel(i.e. DH protocol). So Could you please help in generating AES-256 bits in C# without using it to encrypt any plaintext. I just want the key itself.
I need to make strong key for AES-256 in a) Unicode characters, b) key in bytes. A) I have to generate 50 random Unicode characters and then convert them to bytes. Is this possible to use Unicode characters as AES256 key? I want to use this page to create password. Is there any way to impor.
Mar 01, 2016 Contribute to roneyvia/AES-Key-Generator-in-Java development by creating an account on GitHub.

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 Generate rsa key pair windows 10.

Generate 256 Bit Key

commented Oct 9, 2017•
edited