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95 lines
2.6 KiB
Markdown
95 lines
2.6 KiB
Markdown
## Description:
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`crypto` is a module that exposes cryptographic algorithms to V programs.
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Each submodule implements things differently, so be sure to consider the documentation
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of the specific algorithm you need, but in general, the method is to create a `cipher`
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struct using one of the module functions, and then to call the `encrypt` or `decrypt`
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method on that struct to actually encrypt or decrypt your data.
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This module is a work-in-progress. For example, the AES implementation currently requires you
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to create a destination buffer of the correct size to receive the decrypted data, and the AesCipher
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`encrypt` and `decrypt` functions only operate on the first block of the `src`.
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The implementations here are loosely based on [Go's crypto package](https://pkg.go.dev/crypto).
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## Examples:
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### AES:
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```v
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import crypto.aes
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import crypto.rand
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fn main() {
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// remember to save this key somewhere if you ever want to decrypt your data
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key := rand.bytes(32)!
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println('KEY: ${key}')
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// this data is one block (16 bytes) big
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mut data := 'THIS IS THE DATA'.bytes()
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println('generating cipher')
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cipher := aes.new_cipher(key)
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println('performing encryption')
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mut encrypted := []u8{len: aes.block_size}
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cipher.encrypt(mut encrypted, data)
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println(encrypted)
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println('performing decryption')
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mut decrypted := []u8{len: aes.block_size}
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cipher.decrypt(mut decrypted, encrypted)
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println(decrypted)
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assert decrypted == data
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}
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```
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### JWT:
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```v
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import crypto.hmac
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import crypto.sha256
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import encoding.base64
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import json
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import time
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struct JwtHeader {
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alg string
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typ string
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}
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struct JwtPayload {
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sub string
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name string
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iat int
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}
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fn main() {
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sw := time.new_stopwatch()
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secret := 'your-256-bit-secret'
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token := make_token(secret)
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ok := auth_verify(secret, token)
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dt := sw.elapsed().microseconds()
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println('token: ${token}')
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println('auth_verify(secret, token): ${ok}')
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println('Elapsed time: ${dt} uS')
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}
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fn make_token(secret string) string {
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header := base64.url_encode(json.encode(JwtHeader{'HS256', 'JWT'}).bytes())
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payload := base64.url_encode(json.encode(JwtPayload{'1234567890', 'John Doe', 1516239022}).bytes())
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signature := base64.url_encode(hmac.new(secret.bytes(), '${header}.${payload}'.bytes(),
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sha256.sum, sha256.block_size))
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jwt := '${header}.${payload}.${signature}'
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return jwt
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}
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fn auth_verify(secret string, token string) bool {
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token_split := token.split('.')
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signature_mirror := hmac.new(secret.bytes(), '${token_split[0]}.${token_split[1]}'.bytes(),
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sha256.sum, sha256.block_size)
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signature_from_token := base64.url_decode(token_split[2])
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return hmac.equal(signature_from_token, signature_mirror)
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}
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```
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