From c481b80ec39ec533790ed3bef1245ed54b9c8d02 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hitalo=20de=20Jesus=20do=20Ros=C3=A1rio=20Souza?=
 <63821277+enghitalo@users.noreply.github.com>
Date: Wed, 29 Jun 2022 05:57:05 -0300
Subject: [PATCH] docs: add a jwt example to vlib/crypto/README.md (#14872)

---
 vlib/crypto/README.md | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/vlib/crypto/README.md b/vlib/crypto/README.md
index 76ed2961ab..34125116e4 100644
--- a/vlib/crypto/README.md
+++ b/vlib/crypto/README.md
@@ -15,6 +15,7 @@ The implementations here are loosely based on [Go's crypto package](https://pkg.
 
 ## Examples:
 
+### AES:
 ```v
 import crypto.aes
 import crypto.rand
@@ -43,3 +44,40 @@ fn main() {
 	assert decrypted == data
 }
 ```
+
+### JWT:
+```v
+import crypto.hmac
+import crypto.sha256
+import encoding.base64
+import json
+
+struct JwtHeader {
+	alg string
+	typ string
+}
+
+struct JwtPayload {
+	sub  string
+	name string
+	iat  int
+}
+
+fn main() {
+	token := make_token()
+	println(token)
+}
+
+fn make_token() string {
+	secret := 'your-256-bit-secret'
+
+	header := base64.url_encode(json.encode(JwtHeader{'HS256', 'JWT'}).bytes())
+	payload := base64.url_encode(json.encode(JwtPayload{'1234567890', 'John Doe', 1516239022}).bytes())
+	signature := base64.url_encode(hmac.new(secret.bytes(), '${header}.$payload'.bytes(),
+		sha256.sum, sha256.block_size).bytestr().bytes())
+
+	jwt := '${header}.${payload}.$signature'
+
+	return jwt
+}
+```