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v/vlib/crypto/cipher/cipher.v

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// The source code refers to the go standard library, which will be combined with AES in the future.
module cipher
// A Block represents an implementation of block cipher
// using a given key. It provides the capability to encrypt
// or decrypt individual blocks. The mode implementations
// extend that capability to streams of blocks.
interface Block {
block_size int // block_size returns the cipher's block size.
encrypt(mut dst []byte, src []byte) // Encrypt encrypts the first block in src into dst.
// Dst and src must overlap entirely or not at all.
decrypt(mut dst []byte, src []byte) // Decrypt decrypts the first block in src into dst.
// Dst and src must overlap entirely or not at all.
}
// A Stream represents a stream cipher.
interface Stream {
// xor_key_stream XORs each byte in the given slice with a byte from the
// cipher's key stream. Dst and src must overlap entirely or not at all.
//
// If len(dst) < len(src), xor_key_stream should panic. It is acceptable
// to pass a dst bigger than src, and in that case, xor_key_stream will
// only update dst[:len(src)] and will not touch the rest of dst.
//
// Multiple calls to xor_key_stream behave as if the concatenation of
// the src buffers was passed in a single run. That is, Stream
// maintains state and does not reset at each xor_key_stream call.
xor_key_stream(mut dst []byte, src []byte)
}
// A BlockMode represents a block cipher running in a block-based mode (CBC,
// ECB etc).
interface BlockMode {
block_size int // block_size returns the mode's block size.
crypt_blocks(mut dst []byte, src []byte) // crypt_blocks encrypts or decrypts a number of blocks. The length of
// src must be a multiple of the block size. Dst and src must overlap
// entirely or not at all.
//
// If len(dst) < len(src), crypt_blocks should panic. It is acceptable
// to pass a dst bigger than src, and in that case, crypt_blocks will
// only update dst[:len(src)] and will not touch the rest of dst.
//
// Multiple calls to crypt_blocks behave as if the concatenation of
// the src buffers was passed in a single run. That is, BlockMode
// maintains state and does not reset at each crypt_blocks call.
}
// Utility routines
// fn dup(p []byte) []byte {
// q := make([]byte, p.len)
// copy(mut q, p)
// return q
// }