Php Generate 256 Bit Key

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Generates a random key, a-Z 0-9 with no max length

Usage

Use as demonstrated in the comment. This can be good to append to a url and store in a database, and check for in a site registration during email validation (i.e. http://site.com/register.php?connfirmationcode=2QwYbI0mf4exPi

Comments

RandomKeygen is a free mobile-friendly tool that offers randomly generated keys and passwords you can use to secure any application, service or device. KEY RandomKeygen - The Secure Password & Keygen Generator.

  • Use PBKDF2 to generate a 256-bit key from your password and the salt, then split that into two 128-bit keys (k2, k3). Make sure your algorithm's native output is at least 256 bits, or this will be slow. PBKDF2- SHA256 is a good choice.
  • // The number of bytes in the secret key defines the bit-strength of an encryption // algorithm. For example, AES with a 32-byte key is 256-bit AES. Most algorithms // define restrictions on key sizes. For example, AES has 3 choices: 128-bit, 192-bit, // or 256-bit. In the ChaCha20 algorithm, the key size must always be 256-bits (32-bytes).

Tahnks !!

hi, guest your code is awesome than the original one.its user friendly and we can change our key characters easily by editing $options. i prefer your code than the original one posted.

Nice function guys. I will be using it to write a function for generating card pins for web login. Pins generated are stored on a database. When a pin is generated it is matched with the ones on the database if it exits, it is discarded if not exit, it is added to the database.
What do you think?

What about uniqueness?

fuck

nice, i use something similar
<?php
function generatekey($length)
{
$options = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
$code = ';
for($i = 0; $i < $length; $i++)
{
$key = rand(0, strlen($options) - 1);
$code .= $options[$key];
}
return $code;
}
Mass effect 3 product key generator. // echo generatekey(10); // Ko9B69utve, returned result is random. not only is this good for ac validatin but has several other applicvations, eg captch ect its uses are limitless.
?>

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

Php Generate 256 Bit Key Code

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

What Is 256 Bit

commented Oct 9, 2017
edited

Subkey Generation For 256 Bit Key

How-to save -safely- the private key ? Windows registry ? in disk ?

I use ASP.NET applications.

Test your code

256 Bit Color

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