/*
 *  Copyright (c) 2020 Samsung Electronics Co., Ltd All Rights Reserved
 *
 *  Contact: Lukasz Pawelczyk <l.pawelczyk@samsung.com>
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License
 */

#![doc(test(no_crate_inject))]
//! YACA - Yet Another Crypto API. Bindings for C library YACA
//!
//! # Examples
//!
//! ```
//!use std::ffi::CString;
//!use yaca::{self, prelude::*};
//!use yaca::{Key, KeyType, KeyLength, KeyFormat, KeyFileFormat, EncryptContext,
//!           DecryptContext, EncryptAlgorithm, BlockCipherMode, Padding};
//!
//!pub const MSG: &[u8] = b"Lorem ipsum dolor sit amet.";
//!
//!fn main() -> Result<(), Box<dyn std::error::Error>>
//!{
//!    // Start
//!
//!    yaca::initialize()?;
//!
//!    // Key generate/export/import example:
//!
//!    let key = Key::generate(&KeyType::RsaPrivate,
//!                            &KeyLength::Bits(512))?;
//!    let p = CString::new("password")?;
//!    let data = key.export(&KeyFormat::Default, &KeyFileFormat::Pem, Some(&p))?;
//!    let key = Key::import(&data, &KeyType::RsaPrivate, Some(&p))?;
//!
//!    println!("{:?}: {:?}", key.get_type()?, key.get_length()?);
//!
//!    // Encrypt/decrypt example:
//!
//!    // Prepare
//!
//!    let algo = EncryptAlgorithm::Aes;
//!    let cbc = BlockCipherMode::Cbc;
//!    let key_len = KeyLength::Bits(256);
//!    let sym_key = Key::generate(&KeyType::Symmetric, &key_len)?;
//!    let iv_len = EncryptContext::get_iv_length(&algo, &cbc, &key_len)?;
//!    let iv = match &iv_len {
//!        None => None,
//!        Some(x) => Some(Key::generate(&KeyType::Iv, x)?),
//!    };
//!    if let Some(x) = &iv {
//!        println!("IV_used: {:?}: {:?}", x.get_type()?, x.get_length()?);
//!    };
//!
//!    // Encrypt
//!
//!    let ctx = EncryptContext::initialize(&algo, &cbc, &sym_key, iv.as_ref())?;
//!    ctx.set_property_padding(&Padding::Pkcs7)?;
//!    let mut cipher: Vec<u8> = Vec::new();
//!    for i in MSG.chunks(5) {
//!        cipher.append(&mut ctx.update(i)?);
//!    };
//!    cipher.append(&mut ctx.finalize()?);
//!
//!    // Decrypt
//!
//!    let ctx = DecryptContext::initialize(&algo, &cbc, &sym_key, iv.as_ref())?;
//!    ctx.set_property_padding(&Padding::Pkcs7)?;
//!    let mut plain: Vec<u8> = Vec::new();
//!    for i in cipher.chunks(5) {
//!        plain.append(&mut ctx.update(i)?);
//!    };
//!    plain.append(&mut ctx.finalize()?);
//!
//!    // Check
//!
//!    assert_eq!(MSG, plain);
//!    let plain = CString::new(plain)?;
//!    println!("{}", plain.to_str()?);
//!
//!    // Finish
//!
//!    Ok(yaca::cleanup())
//!}
//! ```
//!
//! # Simple API:
//!
//! Defined by functions named `Yaca::simple_*`
//!
//! Design constraints:
//! - All operations are single-shot (no streaming possible)
//! - Context is not used
//! - Only digest, signatures and symmetric ciphers are supported
//! - Disabling PKCS#7 padding for ECB and CBC chaining is not supported
//! - Changing the default PKCS#1 padding for sign/verify is not supported
//! - GCM and CCM chaining is not supported
//! - RC2 effective key bits property is not supported
//!
//! ```
//!use std::ffi::CString;
//!use yaca::{self, prelude::*};
//!use yaca::{Key, KeyType, KeyLength, EncryptAlgorithm, BlockCipherMode};
//!
//!pub const MSG: &[u8] = b"Lorem ipsum dolor sit amet.";
//!
//!fn main() -> Result<(), Box<dyn std::error::Error>>
//!{
//!    // Start
//!    yaca::initialize()?;
//!
//!    // Simple encrypt/decrypt of empty data
//!    let sym_key = Key::generate(&KeyType::Symmetric, &KeyLength::Bits(256))?;
//!    let v = yaca::simple_encrypt(&EncryptAlgorithm::UnsafeRc4, &BlockCipherMode::None,
//!                                 &sym_key, None, &Vec::new())?;
//!    assert!(v.is_empty());
//!    let v = yaca::simple_decrypt(&EncryptAlgorithm::UnsafeRc4, &BlockCipherMode::None,
//!                                 &sym_key, None, &Vec::new())?;
//!    assert!(v.is_empty());
//!
//!    // Simple encrypt/decrypt
//!    let iv = Key::generate(&KeyType::Iv, &KeyLength::Bits(128))?;
//!    let cipher = yaca::simple_encrypt(&EncryptAlgorithm::Aes, &BlockCipherMode::Cbc,
//!                                      &sym_key, Some(&iv), MSG)?;
//!    let plain = yaca::simple_decrypt(&EncryptAlgorithm::Aes, &BlockCipherMode::Cbc,
//!                                     &sym_key, Some(&iv), &cipher)?;
//!
//!    // Check for simple
//!    assert_eq!(MSG, plain);
//!    let plain = CString::new(plain)?;
//!    println!("{}", plain.to_str()?);
//!
//!    // Finish
//!    Ok(yaca::cleanup())
//!}
//! ```


mod yaca_common;
mod yaca_lib;
mod yaca_conv;

mod error;
mod types;
mod crypto;
mod simple;
mod rsa;
mod key;
mod digest;
mod encrypt;
mod seal;
mod sign;


/// Include this prelude with `use yaca::prelude::*` to access required traits.
pub mod prelude {
    pub use super::crypto::ContextWithPadding;
    pub use super::crypto::ContextWithRc2Supported;
    pub use super::crypto::ContextWithXcmEncryptProperties;
    pub use super::crypto::ContextWithXcmDecryptProperties;
}

// TODO: consider simplifying those "pub use" in the future

pub type Result<T> = std::result::Result<T, Error>;

pub use error::Error;

pub use types::KeyFormat;
pub use types::KeyFileFormat;
pub use types::KeyType;
pub use types::KeyLength;
pub use types::KeyLengthEc::{self, *};
pub use types::KeyLengthDh::{self, *};
pub use types::DigestAlgorithm;
pub use types::EncryptAlgorithm;
pub use types::BlockCipherMode;
pub use types::Padding;
pub use types::Kdf;

pub use crypto::initialize;
pub use crypto::cleanup;
pub use crypto::memcmp;
pub use crypto::random_bytes;
#[doc(inline)]
pub use prelude::*;  // context traits from crypto

pub use simple::simple_encrypt;
pub use simple::simple_decrypt;
pub use simple::simple_calculate_digest;
pub use simple::simple_calculate_signature;
pub use simple::simple_verify_signature;
pub use simple::simple_calculate_cmac;
pub use simple::simple_calculate_hmac;

pub use rsa::rsa_public_encrypt;
pub use rsa::rsa_private_decrypt;
pub use rsa::rsa_private_encrypt;
pub use rsa::rsa_public_decrypt;

pub use key::Key;
pub use digest::DigestContext;
pub use encrypt::EncryptContext;
pub use encrypt::DecryptContext;
pub use seal::SealContext;
pub use seal::OpenContext;
pub use sign::SignContext;
pub use sign::VerifyContext;