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Which key length is possible in Codeigniter encryption?


Which key length is possible in Codeigniter encryption?

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Which key length is possible in Codeigniter encryption?
Tag : codeigniter , By : chorn
Date : November 29 2020, 09:01 AM

wish help you to fix your issue AES has a fixed block size of 128 bit and supports key sizes of 128, 192 and 256 bit. It does not support key sizes of 512 bit (64 byte). Rijndael, which AES is based on, supports block sizes of 128, 192 and 256 bit with the same key sizes as AES.
If you're using system/libraries/Encrypt.php, then you're using Rijndael-256 (default; not AES, because the block size (256) is different) with a key size of 256 bit. Every "key" that you pass in will be hashed with MD5 which is actually only 128 bit in size, but it is Hex-encoded and therefore needlessly inflated to 256 bit without extra security. Needless to say, this is rather old and should never be used anymore.

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Encryption key in CodeIgniter


Tag : codeigniter , By : Robert MacGregor
Date : March 29 2020, 07:55 AM
will be helpful for those in need
The key should be as random as possible and it must not be a regular text string, nor the output of a hashing function, etc.
$config['encryption_key'] = 'yourKeyHere'

C# AES Encryption in CFB Where Plaintext Length Equals Encrypted Length


Tag : chash , By : nhuser
Date : March 29 2020, 07:55 AM
Any of those help I revisited trying to use cryptlib and it solved my problem... code is below:
using cryptlib;

byte[] key = new byte[16] {...key bytes here...};

byte[] iv =  new byte[16] {...iv bytes here...};

byte[] enc;  //ciphertext bytes (i populated them from a filestream)

crypt.Init();
int cryptContext = crypt.CreateContext(crypt.UNUSED, crypt.ALGO_AES);
crypt.SetAttribute(cryptContext, crypt.CTXINFO_MODE, crypt.MODE_CFB);
crypt.SetAttributeString(cryptContext, crypt.CTXINFO_KEY, key, 0, 16);
crypt.SetAttributeString(cryptContext, crypt.CTXINFO_IV, iv, 0, 16);
crypt.Decrypt(cryptContext, enc);   //ciphertext bytes replaced with plaintext bytes
crypt.DestroyContext(cryptContext);

ASP.NET DES encryption with encrypted text length equal to plain text length


Tag : chash , By : glisignoli
Date : March 29 2020, 07:55 AM
will be helpful for those in need As stated in this CodeProject article from some time ago.
public static byte[] Encrypt(byte[] data, byte[] key, byte[] iv)
{
    BufferedBlockCipher cipher = new CtsBlockCipher(new CbcBlockCipher(new AesEngine()));
    ICipherParameters keyParam = new ParametersWithIV(new KeyParameter(key), iv);
    cipher.Init(true, keyParam);
    return cipher.DoFinal(data, 0, data.Length);
}

public static byte[] Decrypt(byte[] data, byte[] key, byte[] iv)
{
    BufferedBlockCipher cipher = new CtsBlockCipher(new CbcBlockCipher(new AesEngine()));
    ICipherParameters keyParam = new ParametersWithIV(new KeyParameter(key), iv);
    cipher.Init(false, keyParam);
    return cipher.DoFinal(data, 0, data.Length);
}

Why Laravel4.2 Encryption Key less than Encryption Key character in CodeIgniter?


Tag : php , By : SachinJadhav
Date : March 29 2020, 07:55 AM
this will help AES keys need to be indistinguishable from random and either 16, 24 or 32 bytes in length. It seems Laravel adds an additional check for the AES key to be a valid size.
Basically what the PHP's mcrypt does (not sure about the C-code) is that it extends the key data with 00 valued bytes if the key is smaller than 32 bytes, until it gets to the first legal AES key size. If the key is larger than 32 bytes it simply cuts it to 32 bytes. This is absolutely against any good practice with regards to handling keys.

AES/CCM Encryption and Plaintext Length Exceeds Maximum Message Length


Tag : cpp , By : Lee KW
Date : March 29 2020, 07:55 AM
I wish did fix the issue.
My question is, how do I encrypt/decrypt a plaintext which is longer than 16777215 bytes?
lword MaxMessageLength() const
    {return m_L<8 ? (W64LIT(1)<<(8*m_L))-1 : W64LIT(0)-1;}
if (m_state >= State_IVSet && length > MaxMessageLength()-m_totalMessageLength)
    throw InvalidArgument(AlgorithmName() + ": message length exceeds maximum");
m_totalMessageLength += length;
const int TAG_SIZE = 8;
CCM< AES, TAG_SIZE >::Encryption e;
CCM< AES, TAG_SIZE >::Decryption d;
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