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use argon2rs::{ Argon2, Variant, ParamErr };
use seckey::Bytes;
use super::{ KeyDerive, KeyDerivationFail };
pub const OPSLIMIT_INTERACTIVE: u32 = 4;
pub const MEMLIMIT_INTERACTIVE: u32 = 33554432;
pub const OPSLIMIT_MODERATE: u32 = 6;
pub const MEMLIMIT_MODERATE: u32 = 134217728;
pub const OPSLIMIT_SENSITIVE: u32 = 8;
pub const MEMLIMIT_SENSITIVE: u32 = 536870912;
#[derive(Debug, Clone)]
pub struct Argon2i {
key: Bytes,
aad: Bytes,
outlen: usize,
passes: u32,
lanes: u32,
kib: u32
}
impl Default for Argon2i {
fn default() -> Argon2i {
Argon2i {
key: Bytes::empty(),
aad: Bytes::empty(),
outlen: 16,
passes: OPSLIMIT_INTERACTIVE,
lanes: 1,
kib: MEMLIMIT_INTERACTIVE / 1024
}
}
}
impl KeyDerive for Argon2i {
fn with_size(&mut self, len: usize) -> &mut Self {
self.outlen = len;
self
}
fn with_key(&mut self, key: &[u8]) -> &mut Self {
self.key = Bytes::new(key);
self
}
fn with_aad(&mut self, aad: &[u8]) -> &mut Self {
self.aad = Bytes::new(aad);
self
}
fn with_opslimit(&mut self, opslimit: u32) -> &mut Self {
self.passes = opslimit;
self
}
fn with_memlimit(&mut self, memlimit: u32) -> &mut Self {
self.kib = memlimit / 1024;
self
}
fn derive<K>(&self, password: &[u8], salt: &[u8])
-> Result<K, KeyDerivationFail>
where K: From<Vec<u8>>
{
if salt.len() < 8 { Err(KeyDerivationFail::SaltTooShort)? };
if salt.len() > 0xffffffff { Err(KeyDerivationFail::SaltTooLong)? };
if self.outlen < 4 { Err(KeyDerivationFail::OutLenTooShort)? };
if self.outlen > 0xffffffff { Err(KeyDerivationFail::OutLenTooLong)? };
let mut output = vec![0; self.outlen];
Argon2::new(self.passes, self.lanes, self.kib, Variant::Argon2i)?
.hash(&mut output, password, salt, &self.key, &self.aad);
Ok(output.into())
}
}
impl From<ParamErr> for KeyDerivationFail {
fn from(err: ParamErr) -> KeyDerivationFail {
use std::error::Error;
KeyDerivationFail::ParameterError(err.description().to_string())
}
}