padding.go

// Excerpt from Practical Cryptography With Go
// https://leanpub.com/gocrypto/read#leanpub-auto-block-padding

// Pad applies the PKCS #7 padding scheme on the buffer.
func Pad(in []byte) []byte {
    padding := 16 - (len(in) % 16)
    if padding == 0 {
        padding = 16
    }
    for i := 0; i < padding; i++ {
        in = append(in, byte(padding))
    }
    return in
}