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v/vlib/crypto/README.md

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## Description:
`crypto` is a module that exposes cryptographic algorithms to V programs.
Each submodule implements things differently, so be sure to consider the documentation
of the specific algorithm you need, but in general, the method is to create a `cipher`
struct using one of the module functions, and then to call the `encrypt` or `decrypt`
method on that struct to actually encrypt or decrypt your data.
This module is a work-in-progress. For example, the AES implementation currently requires you
to create a destination buffer of the correct size to receive the decrypted data, and the AesCipher
`encrypt` and `decrypt` functions only operate on the first block of the `src`.
The implementations here are loosely based on [Go's crypto package](https://pkg.go.dev/crypto).
## Examples:
```v
import crypto.aes
import crypto.rand
fn main() {
// remember to save this key somewhere if you ever want to decrypt your data
key := rand.read(32) ?
println('KEY: $key')
// this data is one block (16 bytes) big
mut data := 'THIS IS THE DATA'.bytes()
println('generating cipher')
cipher := aes.new_cipher(key)
println('performing encryption')
mut encrypted := []byte{len: aes.block_size}
cipher.encrypt(mut encrypted, data)
println(encrypted)
println('performing decryption')
mut decrypted := []byte{len: aes.block_size}
cipher.decrypt(mut decrypted, encrypted)
println(decrypted)
assert decrypted == data
}
```