crylib 0.2.0

a collection of cryptographic functions
Documentation 
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//! The ChaCha20 stream cipher, Poly1305 authenticator, and ChaCha20-Poly1305 AEAD.
//!
//! Note: Poly1305 and ChaCha20-Poly1305 are incomplete.

use core::marker::PhantomPinned;

use poly1305::{poly1305_key_gen, Poly1305};

use super::{Aead, BadData, IV_SIZE, TAG_SIZE};
pub mod chacha20;
pub mod poly1305;

pub struct ChaCha20Poly1305 {
    key: [u8; Self::KEY_SIZE],
    _pin: PhantomPinned,
}

impl ChaCha20Poly1305 {
    pub const KEY_SIZE: usize = 32;
    pub const fn new(key: [u8; Self::KEY_SIZE]) -> Self {
        Self {
            key,
            _pin: PhantomPinned,
        }
    }
}

impl Aead for ChaCha20Poly1305 {
    fn encrypt_inline(
        &self,
        msg: &mut [u8],
        add_data: &[u8],
        iv: &[u8; super::IV_SIZE],
    ) -> [u8; super::TAG_SIZE] {
        chacha20::encrypt_inline(msg, &self.key, iv, 1);
        poly_auth(&self.key, iv, add_data, msg)
    }

    fn decrypt_inline(
        &self,
        msg: &mut [u8],
        add_data: &[u8],
        iv: &[u8; super::IV_SIZE],
        tag: &[u8; super::TAG_SIZE],
    ) -> Result<(), super::BadData> {
        let gen_tag = poly_auth(&self.key, iv, add_data, msg);
        if tag != &gen_tag {
            return Err(BadData);
        }
        chacha20::encrypt_inline(msg, &self.key, iv, 1);
        Ok(())
    }
}

fn poly_auth(
    key: &[u8; ChaCha20Poly1305::KEY_SIZE],
    iv: &[u8; IV_SIZE],
    add_data: &[u8],
    cipher_text: &[u8],
) -> [u8; TAG_SIZE] {
    let one_time_key = poly1305_key_gen(key, iv);

    let mut poly = Poly1305::new(&one_time_key);

    poly.update_with(add_data);
    poly.update_with(cipher_text);

    let mut lens = [0; 16];
    lens[..size_of::<u64>()].copy_from_slice(&(add_data.len() as u64).to_le_bytes());
    lens[size_of::<u64>()..].copy_from_slice(&(cipher_text.len() as u64).to_le_bytes());

    poly.update(&lens);
    poly.finish()
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn decrypt() {
        let key = [
            0x1c, 0x92, 0x40, 0xa5, 0xeb, 0x55, 0xd3, 0x8a, 0xf3, 0x33, 0x88, 0x86, 0x04, 0xf6,
            0xb5, 0xf0, 0x47, 0x39, 0x17, 0xc1, 0x40, 0x2b, 0x80, 0x09, 0x9d, 0xca, 0x5c, 0xbc,
            0x20, 0x70, 0x75, 0xc0,
        ];
        let mut cipher_text = [
            0x64, 0xa0, 0x86, 0x15, 0x75, 0x86, 0x1a, 0xf4, 0x60, 0xf0, 0x62, 0xc7, 0x9b, 0xe6,
            0x43, 0xbd, 0x5e, 0x80, 0x5c, 0xfd, 0x34, 0x5c, 0xf3, 0x89, 0xf1, 0x08, 0x67, 0x0a,
            0xc7, 0x6c, 0x8c, 0xb2, 0x4c, 0x6c, 0xfc, 0x18, 0x75, 0x5d, 0x43, 0xee, 0xa0, 0x9e,
            0xe9, 0x4e, 0x38, 0x2d, 0x26, 0xb0, 0xbd, 0xb7, 0xb7, 0x3c, 0x32, 0x1b, 0x01, 0x00,
            0xd4, 0xf0, 0x3b, 0x7f, 0x35, 0x58, 0x94, 0xcf, 0x33, 0x2f, 0x83, 0x0e, 0x71, 0x0b,
            0x97, 0xce, 0x98, 0xc8, 0xa8, 0x4a, 0xbd, 0x0b, 0x94, 0x81, 0x14, 0xad, 0x17, 0x6e,
            0x00, 0x8d, 0x33, 0xbd, 0x60, 0xf9, 0x82, 0xb1, 0xff, 0x37, 0xc8, 0x55, 0x97, 0x97,
            0xa0, 0x6e, 0xf4, 0xf0, 0xef, 0x61, 0xc1, 0x86, 0x32, 0x4e, 0x2b, 0x35, 0x06, 0x38,
            0x36, 0x06, 0x90, 0x7b, 0x6a, 0x7c, 0x02, 0xb0, 0xf9, 0xf6, 0x15, 0x7b, 0x53, 0xc8,
            0x67, 0xe4, 0xb9, 0x16, 0x6c, 0x76, 0x7b, 0x80, 0x4d, 0x46, 0xa5, 0x9b, 0x52, 0x16,
            0xcd, 0xe7, 0xa4, 0xe9, 0x90, 0x40, 0xc5, 0xa4, 0x04, 0x33, 0x22, 0x5e, 0xe2, 0x82,
            0xa1, 0xb0, 0xa0, 0x6c, 0x52, 0x3e, 0xaf, 0x45, 0x34, 0xd7, 0xf8, 0x3f, 0xa1, 0x15,
            0x5b, 0x00, 0x47, 0x71, 0x8c, 0xbc, 0x54, 0x6a, 0x0d, 0x07, 0x2b, 0x04, 0xb3, 0x56,
            0x4e, 0xea, 0x1b, 0x42, 0x22, 0x73, 0xf5, 0x48, 0x27, 0x1a, 0x0b, 0xb2, 0x31, 0x60,
            0x53, 0xfa, 0x76, 0x99, 0x19, 0x55, 0xeb, 0xd6, 0x31, 0x59, 0x43, 0x4e, 0xce, 0xbb,
            0x4e, 0x46, 0x6d, 0xae, 0x5a, 0x10, 0x73, 0xa6, 0x72, 0x76, 0x27, 0x09, 0x7a, 0x10,
            0x49, 0xe6, 0x17, 0xd9, 0x1d, 0x36, 0x10, 0x94, 0xfa, 0x68, 0xf0, 0xff, 0x77, 0x98,
            0x71, 0x30, 0x30, 0x5b, 0xea, 0xba, 0x2e, 0xda, 0x04, 0xdf, 0x99, 0x7b, 0x71, 0x4d,
            0x6c, 0x6f, 0x2c, 0x29, 0xa6, 0xad, 0x5c, 0xb4, 0x02, 0x2b, 0x02, 0x70, 0x9b,
        ];
        let nonce = [
            0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
        ];
        let add_data = [
            0xf3, 0x33, 0x88, 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x4e, 0x91,
        ];
        let tag = [
            0xee, 0xad, 0x9d, 0x67, 0x89, 0x0c, 0xbb, 0x22, 0x39, 0x23, 0x36, 0xfe, 0xa1, 0x85,
            0x1f, 0x38,
        ];
        let plaint_text = [
            0x49, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2d, 0x44, 0x72, 0x61, 0x66, 0x74,
            0x73, 0x20, 0x61, 0x72, 0x65, 0x20, 0x64, 0x72, 0x61, 0x66, 0x74, 0x20, 0x64, 0x6f,
            0x63, 0x75, 0x6d, 0x65, 0x6e, 0x74, 0x73, 0x20, 0x76, 0x61, 0x6c, 0x69, 0x64, 0x20,
            0x66, 0x6f, 0x72, 0x20, 0x61, 0x20, 0x6d, 0x61, 0x78, 0x69, 0x6d, 0x75, 0x6d, 0x20,
            0x6f, 0x66, 0x20, 0x73, 0x69, 0x78, 0x20, 0x6d, 0x6f, 0x6e, 0x74, 0x68, 0x73, 0x20,
            0x61, 0x6e, 0x64, 0x20, 0x6d, 0x61, 0x79, 0x20, 0x62, 0x65, 0x20, 0x75, 0x70, 0x64,
            0x61, 0x74, 0x65, 0x64, 0x2c, 0x20, 0x72, 0x65, 0x70, 0x6c, 0x61, 0x63, 0x65, 0x64,
            0x2c, 0x20, 0x6f, 0x72, 0x20, 0x6f, 0x62, 0x73, 0x6f, 0x6c, 0x65, 0x74, 0x65, 0x64,
            0x20, 0x62, 0x79, 0x20, 0x6f, 0x74, 0x68, 0x65, 0x72, 0x20, 0x64, 0x6f, 0x63, 0x75,
            0x6d, 0x65, 0x6e, 0x74, 0x73, 0x20, 0x61, 0x74, 0x20, 0x61, 0x6e, 0x79, 0x20, 0x74,
            0x69, 0x6d, 0x65, 0x2e, 0x20, 0x49, 0x74, 0x20, 0x69, 0x73, 0x20, 0x69, 0x6e, 0x61,
            0x70, 0x70, 0x72, 0x6f, 0x70, 0x72, 0x69, 0x61, 0x74, 0x65, 0x20, 0x74, 0x6f, 0x20,
            0x75, 0x73, 0x65, 0x20, 0x49, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2d, 0x44,
            0x72, 0x61, 0x66, 0x74, 0x73, 0x20, 0x61, 0x73, 0x20, 0x72, 0x65, 0x66, 0x65, 0x72,
            0x65, 0x6e, 0x63, 0x65, 0x20, 0x6d, 0x61, 0x74, 0x65, 0x72, 0x69, 0x61, 0x6c, 0x20,
            0x6f, 0x72, 0x20, 0x74, 0x6f, 0x20, 0x63, 0x69, 0x74, 0x65, 0x20, 0x74, 0x68, 0x65,
            0x6d, 0x20, 0x6f, 0x74, 0x68, 0x65, 0x72, 0x20, 0x74, 0x68, 0x61, 0x6e, 0x20, 0x61,
            0x73, 0x20, 0x2f, 0xe2, 0x80, 0x9c, 0x77, 0x6f, 0x72, 0x6b, 0x20, 0x69, 0x6e, 0x20,
            0x70, 0x72, 0x6f, 0x67, 0x72, 0x65, 0x73, 0x73, 0x2e, 0x2f, 0xe2, 0x80, 0x9d,
        ];
        let cipher = ChaCha20Poly1305::new(key);
        cipher
            .decrypt_inline(&mut cipher_text, &add_data, &nonce, &tag)
            .expect("tag matches");
        assert_eq!(cipher_text, plaint_text);
    }

    #[test]
    fn encrypt() {
        let key = [
            0x1c, 0x92, 0x40, 0xa5, 0xeb, 0x55, 0xd3, 0x8a, 0xf3, 0x33, 0x88, 0x86, 0x04, 0xf6,
            0xb5, 0xf0, 0x47, 0x39, 0x17, 0xc1, 0x40, 0x2b, 0x80, 0x09, 0x9d, 0xca, 0x5c, 0xbc,
            0x20, 0x70, 0x75, 0xc0,
        ];
        let mut plaint_text = [
            0x49, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2d, 0x44, 0x72, 0x61, 0x66, 0x74,
            0x73, 0x20, 0x61, 0x72, 0x65, 0x20, 0x64, 0x72, 0x61, 0x66, 0x74, 0x20, 0x64, 0x6f,
            0x63, 0x75, 0x6d, 0x65, 0x6e, 0x74, 0x73, 0x20, 0x76, 0x61, 0x6c, 0x69, 0x64, 0x20,
            0x66, 0x6f, 0x72, 0x20, 0x61, 0x20, 0x6d, 0x61, 0x78, 0x69, 0x6d, 0x75, 0x6d, 0x20,
            0x6f, 0x66, 0x20, 0x73, 0x69, 0x78, 0x20, 0x6d, 0x6f, 0x6e, 0x74, 0x68, 0x73, 0x20,
            0x61, 0x6e, 0x64, 0x20, 0x6d, 0x61, 0x79, 0x20, 0x62, 0x65, 0x20, 0x75, 0x70, 0x64,
            0x61, 0x74, 0x65, 0x64, 0x2c, 0x20, 0x72, 0x65, 0x70, 0x6c, 0x61, 0x63, 0x65, 0x64,
            0x2c, 0x20, 0x6f, 0x72, 0x20, 0x6f, 0x62, 0x73, 0x6f, 0x6c, 0x65, 0x74, 0x65, 0x64,
            0x20, 0x62, 0x79, 0x20, 0x6f, 0x74, 0x68, 0x65, 0x72, 0x20, 0x64, 0x6f, 0x63, 0x75,
            0x6d, 0x65, 0x6e, 0x74, 0x73, 0x20, 0x61, 0x74, 0x20, 0x61, 0x6e, 0x79, 0x20, 0x74,
            0x69, 0x6d, 0x65, 0x2e, 0x20, 0x49, 0x74, 0x20, 0x69, 0x73, 0x20, 0x69, 0x6e, 0x61,
            0x70, 0x70, 0x72, 0x6f, 0x70, 0x72, 0x69, 0x61, 0x74, 0x65, 0x20, 0x74, 0x6f, 0x20,
            0x75, 0x73, 0x65, 0x20, 0x49, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2d, 0x44,
            0x72, 0x61, 0x66, 0x74, 0x73, 0x20, 0x61, 0x73, 0x20, 0x72, 0x65, 0x66, 0x65, 0x72,
            0x65, 0x6e, 0x63, 0x65, 0x20, 0x6d, 0x61, 0x74, 0x65, 0x72, 0x69, 0x61, 0x6c, 0x20,
            0x6f, 0x72, 0x20, 0x74, 0x6f, 0x20, 0x63, 0x69, 0x74, 0x65, 0x20, 0x74, 0x68, 0x65,
            0x6d, 0x20, 0x6f, 0x74, 0x68, 0x65, 0x72, 0x20, 0x74, 0x68, 0x61, 0x6e, 0x20, 0x61,
            0x73, 0x20, 0x2f, 0xe2, 0x80, 0x9c, 0x77, 0x6f, 0x72, 0x6b, 0x20, 0x69, 0x6e, 0x20,
            0x70, 0x72, 0x6f, 0x67, 0x72, 0x65, 0x73, 0x73, 0x2e, 0x2f, 0xe2, 0x80, 0x9d,
        ];
        let nonce = [
            0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
        ];
        let add_data = [
            0xf3, 0x33, 0x88, 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x4e, 0x91,
        ];
        let tag = [
            0xee, 0xad, 0x9d, 0x67, 0x89, 0x0c, 0xbb, 0x22, 0x39, 0x23, 0x36, 0xfe, 0xa1, 0x85,
            0x1f, 0x38,
        ];
        let cipher_text = [
            0x64, 0xa0, 0x86, 0x15, 0x75, 0x86, 0x1a, 0xf4, 0x60, 0xf0, 0x62, 0xc7, 0x9b, 0xe6,
            0x43, 0xbd, 0x5e, 0x80, 0x5c, 0xfd, 0x34, 0x5c, 0xf3, 0x89, 0xf1, 0x08, 0x67, 0x0a,
            0xc7, 0x6c, 0x8c, 0xb2, 0x4c, 0x6c, 0xfc, 0x18, 0x75, 0x5d, 0x43, 0xee, 0xa0, 0x9e,
            0xe9, 0x4e, 0x38, 0x2d, 0x26, 0xb0, 0xbd, 0xb7, 0xb7, 0x3c, 0x32, 0x1b, 0x01, 0x00,
            0xd4, 0xf0, 0x3b, 0x7f, 0x35, 0x58, 0x94, 0xcf, 0x33, 0x2f, 0x83, 0x0e, 0x71, 0x0b,
            0x97, 0xce, 0x98, 0xc8, 0xa8, 0x4a, 0xbd, 0x0b, 0x94, 0x81, 0x14, 0xad, 0x17, 0x6e,
            0x00, 0x8d, 0x33, 0xbd, 0x60, 0xf9, 0x82, 0xb1, 0xff, 0x37, 0xc8, 0x55, 0x97, 0x97,
            0xa0, 0x6e, 0xf4, 0xf0, 0xef, 0x61, 0xc1, 0x86, 0x32, 0x4e, 0x2b, 0x35, 0x06, 0x38,
            0x36, 0x06, 0x90, 0x7b, 0x6a, 0x7c, 0x02, 0xb0, 0xf9, 0xf6, 0x15, 0x7b, 0x53, 0xc8,
            0x67, 0xe4, 0xb9, 0x16, 0x6c, 0x76, 0x7b, 0x80, 0x4d, 0x46, 0xa5, 0x9b, 0x52, 0x16,
            0xcd, 0xe7, 0xa4, 0xe9, 0x90, 0x40, 0xc5, 0xa4, 0x04, 0x33, 0x22, 0x5e, 0xe2, 0x82,
            0xa1, 0xb0, 0xa0, 0x6c, 0x52, 0x3e, 0xaf, 0x45, 0x34, 0xd7, 0xf8, 0x3f, 0xa1, 0x15,
            0x5b, 0x00, 0x47, 0x71, 0x8c, 0xbc, 0x54, 0x6a, 0x0d, 0x07, 0x2b, 0x04, 0xb3, 0x56,
            0x4e, 0xea, 0x1b, 0x42, 0x22, 0x73, 0xf5, 0x48, 0x27, 0x1a, 0x0b, 0xb2, 0x31, 0x60,
            0x53, 0xfa, 0x76, 0x99, 0x19, 0x55, 0xeb, 0xd6, 0x31, 0x59, 0x43, 0x4e, 0xce, 0xbb,
            0x4e, 0x46, 0x6d, 0xae, 0x5a, 0x10, 0x73, 0xa6, 0x72, 0x76, 0x27, 0x09, 0x7a, 0x10,
            0x49, 0xe6, 0x17, 0xd9, 0x1d, 0x36, 0x10, 0x94, 0xfa, 0x68, 0xf0, 0xff, 0x77, 0x98,
            0x71, 0x30, 0x30, 0x5b, 0xea, 0xba, 0x2e, 0xda, 0x04, 0xdf, 0x99, 0x7b, 0x71, 0x4d,
            0x6c, 0x6f, 0x2c, 0x29, 0xa6, 0xad, 0x5c, 0xb4, 0x02, 0x2b, 0x02, 0x70, 0x9b,
        ];
        let cipher = ChaCha20Poly1305::new(key);
        assert_eq!(
            tag,
            cipher.encrypt_inline(&mut plaint_text, &add_data, &nonce)
        );
        assert_eq!(plaint_text, cipher_text);
    }
}