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// Copyright (c) 2017 Martijn Rijkeboer <mrr@sru-systems.com>
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use base64;
use std::{error, fmt};
/// Error type for Argon2 errors.
#[derive(Debug, PartialEq)]
pub enum Error {
/// The output (hash) is too short (minimum is 4).
OutputTooShort,
/// The output (hash) is too long (maximum is 2^32 - 1).
OutputTooLong,
/// The password is too short (minimum is 0).
PwdTooShort,
/// The password is too long (maximum is 2^32 - 1).
PwdTooLong,
/// The salt is too short (minimum is 8).
SaltTooShort,
/// The salt is too long (maximum is 2^32 - 1).
SaltTooLong,
/// The associated data is too short (minimum is 0).
AdTooShort,
/// The associated data is too long (maximum is 2^32 - 1).
AdTooLong,
/// The secret value is too short (minimum is 0).
SecretTooShort,
/// The secret value is too long (maximum is 2^32 - 1).
SecretTooLong,
/// The time cost (passes) is too small (minimum is 1).
TimeTooSmall,
/// The time cost (passes) is too large (maximum is 2^32 - 1).
TimeTooLarge,
/// The memory cost is too small (minimum is 8 x parallelism).
MemoryTooLittle,
/// The memory cost is too large (maximum 2GiB on 32-bit or 4TiB on 64-bit).
MemoryTooMuch,
/// The number of lanes (parallelism) is too small (minimum is 1).
LanesTooFew,
/// The number of lanes (parallelism) is too large (maximum is 2^24 - 1).
LanesTooMany,
/// Incorrect Argon2 variant.
IncorrectType,
/// Incorrect Argon2 version.
IncorrectVersion,
/// The decoding of the encoded data has failed.
DecodingFail,
}
impl Error {
fn msg(&self) -> &str {
match *self {
Error::OutputTooShort => "Output is too short",
Error::OutputTooLong => "Output is too long",
Error::PwdTooShort => "Password is too short",
Error::PwdTooLong => "Password is too long",
Error::SaltTooShort => "Salt is too short",
Error::SaltTooLong => "Salt is too long",
Error::AdTooShort => "Associated data is too short",
Error::AdTooLong => "Associated data is too long",
Error::SecretTooShort => "Secret is too short",
Error::SecretTooLong => "Secret is too long",
Error::TimeTooSmall => "Time cost is too small",
Error::TimeTooLarge => "Time cost is too large",
Error::MemoryTooLittle => "Memory cost is too small",
Error::MemoryTooMuch => "Memory cost is too large",
Error::LanesTooFew => "Too few lanes",
Error::LanesTooMany => "Too many lanes",
Error::IncorrectType => "There is no such type of Argon2",
Error::IncorrectVersion => "There is no such version of Argon2",
Error::DecodingFail => "Decoding failed",
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.msg())
}
}
impl error::Error for Error {
fn description(&self) -> &str {
self.msg()
}
fn cause(&self) -> Option<&error::Error> {
None
}
}
impl From<base64::DecodeError> for Error {
fn from(_: base64::DecodeError) -> Self {
Error::DecodingFail
}
}
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