pkcs7

import "github.com/TheManticoreProject/Manticore/crypto/pkcs7"

Index

• Variables
• func Pad(buffer []byte, blockSize uint8) ([]byte, error)
• func Unpad(buffer []byte) ([]byte, error)

Variables

var (
    ErrInvalidPadding          = errors.New("invalid padding")
    ErrUnPaddingEmptyBuffer    = errors.New("cannot unpad an empty buffer")
    ErrBlockSizeLessThanOne    = errors.New("block size must be greater than 0")
    ErrBlockSizeGreaterThan255 = errors.New("block size must be less than 255")
)

func Pad

func Pad(buffer []byte, blockSize uint8) ([]byte, error)

Pad appends padding to the input buffer to make its length a multiple of the block size.

Parameters: - buffer: A byte slice representing the input data to be padded. - blockSize: An unsigned 8-bit integer specifying the block size for padding.

Returns: - A byte slice containing the padded data. - An error if the block size is less than 1 or greater than 255.

The function performs the following steps: 1. Checks if the block size is valid (between 1 and 255). If not, it returns an error. 2. Calculates the padding length required to make the buffer length a multiple of the block size. 3. Appends the padding bytes to the buffer. Each padding byte has a value equal to the padding length.

Example usage: paddedData, err := Pad([]byte(“example”), 8)

if err != nil {
    fmt.Printf("Error padding data: %s\n", err)
}

fmt.Printf(“Padded data: %x\n”, paddedData)

func Unpad

func Unpad(buffer []byte) ([]byte, error)