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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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To solve this problem in AES, we have modified the key expansion module of AES with Symmetric Random Function Generator (SRFG). SRFG produces the symmetric balanced output in the sense of the number of 1’s and 0’s in the output string irrespective of the input string. Ways to generate symmetric and asymmetric keys. Ask Question. To generate such a key, use OpenSSL as: openssl rand 16 myaes.key AES-256 expects a key of 256 bit, 32 byte. To generate such a key, use. As their name state they both are pseudo random number generator, meaning they both are deterministic algorithms which, given the same.
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 |
commented Jun 6, 2014
Obdwiz professional add on key_generator. 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.' Crypto key generate rsa cisco 2960. please suggest a resolution thanks and regards |
commented Oct 9, 2017 • edited
edited
Generate Random Aes Key
How-to save -safely- the private key ? Windows registry ? in disk ? I use ASP.NET applications. Test your code |
Generate Random Aes 256 Key Code
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