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|
use hmac::{Hmac, Mac};
use scrypt::{Params, scrypt};
use sha2::Sha256;
type HmacSha256 = Hmac<Sha256>;
pub mod scope;
pub mod template;
/// Spectre implements the Spectre/Masterpassword cipher
///
/// # Examples
///
/// ```
/// use spectre::{scope, SiteOptions, Spectre};
/// let s = Spectre::new(
/// "Robert Lee Mitchell",
/// "banana colored duckling",
/// scope::SimpleScoper::default(),
/// );
/// let pw = s.site("masterpasswordapp.com", SiteOptions::default());
/// assert_eq!(pw, "Jejr5[RepuSosp")
/// ```
#[derive(Debug)]
pub struct Spectre {
key: String,
scoper: Box<dyn scope::Scoper>,
}
impl Spectre {
/// Create a new Spectre instance that can be used to generate site passwords.
pub fn new(name: impl Into<String>, secret: impl Into<String>, scoper: impl scope::Scoper + 'static) -> Self {
let key = user_key(name, secret, &scoper);
Self {
scoper: Box::new(scoper),
key,
}
}
fn site_key(&self, name: String, counter: u32, scope: scope::Scope) -> Vec<u8> {
let key = self.scoper.scope(scope);
let hmac_key = hex::decode(&self.key).unwrap();
let mut hmac = HmacSha256::new_from_slice(&hmac_key).unwrap();
let mut seed = Vec::new();
seed.extend_from_slice(key.as_bytes());
seed.extend_from_slice(&(name.len() as u32).to_be_bytes());
seed.extend_from_slice(name.as_bytes());
seed.extend_from_slice(&counter.to_be_bytes());
hmac.update(&seed);
let result = hmac.finalize();
result.into_bytes().to_vec()
}
/// Generate a site password for a given site_name
///
/// Generally this is the domain, e.g. `example.com`
pub fn site(&self, site_name: impl Into<String>, opts: SiteOptions) -> String {
let scope = opts.scope.unwrap_or(scope::Scope::AUTHENTICATION);
let template_type = opts.template.unwrap_or(scope.default_template());
let templates = template::templates(template_type);
let counter = opts.counter.unwrap_or(1);
let site_key = self.site_key(site_name.into(), counter, scope);
let site_byte = site_key[0] as u32;
let templates_len = templates.len() as u32;
let template_idx = site_byte % templates_len;
let template = templates[template_idx as usize];
let mut out = String::new();
for (i, b) in template.as_bytes().iter().enumerate() {
let chars = template::chars(b).to_string();
let chars_len = chars.len() as u32;
let site_key_byte = site_key[i + 1] as u32;
let char_idx = site_key_byte % chars_len;
let char = chars.chars().nth(char_idx as usize).unwrap();
out.push(char);
}
out
}
}
#[derive(Default)]
pub struct SiteOptions {
pub scope: Option<scope::Scope>,
pub template: Option<template::Template>,
pub counter: Option<u32>,
}
fn user_key(name: impl Into<String>, secret: impl Into<String>, scoper: &impl scope::Scoper) -> String {
let name = name.into();
let key = scoper.scope(scope::Scope::AUTHENTICATION);
let out: &mut [u8] = &mut [0u8; 64];
let mut salt = Vec::new();
salt.extend_from_slice(key.as_bytes());
salt.extend_from_slice(&(name.len() as u32).to_be_bytes());
salt.extend_from_slice(name.as_bytes());
scrypt(
secret.into().as_bytes(),
&salt,
&Params::new(15, 8, 2, 64).unwrap(),
out,
)
.unwrap();
hex::encode(out)
}
#[cfg(test)]
mod spectre_tests {
use super::*;
use serde::Deserialize;
use crate::scope::{Scope, SimpleScoper};
use crate::template::Template;
#[test]
fn custom() {
let scoper = SimpleScoper::new("com.jojodev.jolheiser");
let s = Spectre::new(
"Robert Lee Mitchell",
"banana colored duckling",
scoper,
);
let pw = s.site(
"jojodev.com",
SiteOptions {
scope: Some(Scope::IDENTIFICATION),
template: Some(Template::Maximum),
counter: Some(2),
},
);
assert_eq!(pw, "Ig^JIcxD!*)TbefJBi6-")
}
#[derive(Debug, Deserialize)]
struct Tests {
#[serde(rename = "case")]
cases: Vec<Case>,
}
#[derive(Debug, Deserialize)]
struct Case {
#[serde(rename = "@id")]
id: String,
// algorithm: Option<i32>,
#[serde(rename = "userName")]
user_name: Option<String>,
#[serde(rename = "userSecret")]
user_secret: Option<String>,
#[serde(rename = "siteName")]
site_name: Option<String>,
#[serde(rename = "resultType")]
result_type: Option<String>,
#[serde(rename = "keyCounter")]
key_counter: Option<u32>,
#[serde(rename = "keyPurpose")]
key_purpose: Option<String>,
result: Option<String>,
}
#[test]
fn spectre() {
let xml = include_str!("spectre_tests.xml");
let tests: Tests = quick_xml::de::from_str(xml).unwrap();
let mut i = 0;
let total = tests.cases.len() - 1;
for case in tests.cases {
if case.id == "default" {
continue;
}
i += 1;
println!("[{}/{}] {}", i, total, case.id);
let s = Spectre::new(
case.user_name.unwrap_or("Robert Lee Mitchell".to_string()),
case.user_secret
.unwrap_or("banana colored duckling".to_string()),
scope::SimpleScoper::default(),
);
let pw = s.site(
case.site_name.unwrap_or("spectre.app".to_string()),
SiteOptions {
scope: Some(
case.key_purpose
.unwrap_or("Authentication".to_string())
.parse::<Scope>()
.unwrap(),
),
template: Some(
case.result_type
.unwrap_or("Long".to_string())
.parse::<Template>()
.unwrap(),
),
counter: Some(case.key_counter.unwrap_or(1)),
},
);
assert_eq!(pw, case.result.unwrap());
}
}
}
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