dataPaddingRequired exception

[jbg77]

Hello,

I'm trying to encrypt some data using CryptoSwift, and I need to use the noPadding function to achieve the same behavior as mbedtls_aes_crypt_cfb128 in C. I tried the following code:

let input: Array<UInt8> = [0,1,2,3,4,5,6,7,8,9]
let encrypted: Array<UInt8> = try! AES(key: Array("secret0key000000".utf8), blockMode: CBC(iv: Array("0123456789012345".utf8)), padding: .noPadding).encrypt(input)

However, I received the following exception: CryptoSwift.AES.Error.dataPaddingRequired.

Thank in advance

[jbg77]

Hello,

I think I have figured out the issue with my previous attempt to use the noPadding function in CryptoSwift. It seems that if there's no padding, the input needs to be a multiple of 16 bits.

I have updated my input array to include additional bytes so that it's a multiple of 16 bits, like this:
let input: Array<UInt8> = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15] let encrypted: Array<UInt8> = try! AES(key: Array("secret0key000000".utf8), blockMode: CBC(iv: Array("0123456789012345".utf8)), padding: .noPadding).encrypt(input)

This code now works without throwing a CryptoSwift.AES.Error.dataPaddingRequired exception.

I hope this solution helps others who may encounter similar issues.

Best regards.

PS:
And in order to achieve the same behavior as the C function, I need to use CFB instead of CBC.

[krzyzanowskim]

some modes require padding. that's the inherent feature of the block mode. if a data is not divisible by the block size, tha padding adds missing bytes. hence the requirement