github.com/spi-ca/misc@v1.0.1/crypto/pkcs5.go (about)

     1  package crypto
     2  
     3  // Pkcs5pad is a padding function that uses the PKCS5 method.
     4  func Pkcs5pad(data []byte, blocksize int) []byte {
     5  	pad := blocksize - len(data)%blocksize
     6  	b := make([]byte, pad, pad)
     7  	for i := 0; i < pad; i++ {
     8  		b[i] = uint8(pad)
     9  	}
    10  	return append(data, b...)
    11  }
    12  
    13  // Pkcs5unpad is a stripping function that reverts the PKCS5 method.
    14  func Pkcs5unpad(data []byte) []byte {
    15  	pad := int(data[len(data)-1])
    16  	// FIXME: check that the padding bytes are all what we expect
    17  	return data[:len(data)-pad]
    18  }