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use core::fmt;
#[cfg(feature = "std")]
use std::error;

/// Error which notifies that stream cipher has reached the end of a keystream.
#[derive(Copy, Clone, Debug)]
pub struct LoopError;

impl fmt::Display for LoopError {
    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        f.write_str("Loop Error")
    }
}

#[cfg(feature = "std")]
impl error::Error for LoopError {
    fn description(&self) -> &str {
        "stream cipher loop detected"
    }
}

/// Error which notifies that key or/and nonce used in stream cipher
/// initialization had an invalid length.
#[derive(Copy, Clone, Debug)]
pub struct InvalidKeyNonceLength;

impl fmt::Display for InvalidKeyNonceLength {
    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        f.write_str("Loop Error")
    }
}

#[cfg(feature = "std")]
impl error::Error for InvalidKeyNonceLength {
    fn description(&self) -> &str {
        "stream cipher loop detected"
    }
}