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//! A rust implementation of China's standards of encryption algorithms(SM2/SM3/SM4).
//!
//! ## Quick Start
//!
//! ### SM3
//!
//! ```
//! use smcrypto::sm3;
//! let hash = sm3::sm3_hash(b"abc");
//! assert_eq!(hash, "66c7f0f462eeedd9d1f2d46bdc10e4e24167c4875cf2f7a2297da02b8f4ba8e0");
//! ```
//!
//! ### SM2 Key Generate
//!
//! Note that the public key is in hexadecimal format and does not contain the "04" prefix.
//!
//! ```
//! use smcrypto::sm2;
//! let (sk, pk) = sm2::gen_keypair();
//! ```
//!
//! ### SM2 Sign/Verify
//!
//! ```
//! use smcrypto::sm2;
//! let (sk, pk) = sm2::gen_keypair();
//! let sign_ctx = sm2::Sign::new(&sk);
//! let sign = sign_ctx.sign(b"abc", true);
//! let verify_ctx = sm2::Verify::new(&pk);
//! let verify = verify_ctx.verify(b"abc", &sign, true);
//! assert_eq!(verify, true);
//! ```
//!
//! ### SM2 Encrypt/Decrypt
//!
//! ```
//! use smcrypto::sm2;
//! let (sk, pk) = sm2::gen_keypair();
//! let enc_ctx = sm2::Encrypt::new(&pk);
//! let enc = enc_ctx.encrypt(b"abc");
//! let dec_ctx = sm2::Decrypt::new(&sk);
//! let dec = dec_ctx.decrypt(&enc);
//! assert_eq!(String::from_utf8(dec).unwrap(), "abc");
//! ```
//!
//! ### SM2 Key Exchange
//!
//! ```
//! use smcrypto::sm2;
//! // Step 1
//! // a side
//! let ida = b"id_a@company.com";
//! let (ska, _) = sm2::gen_keypair();
//! let keyexchange_a = sm2::KeyExchange::new(ida, &ska);
//! let (a2b, rska) = keyexchange_a.keyexchange_1ab(16);
//! // b side
//! let idb = b"id_b@company.com";
//! let (skb, _) = sm2::gen_keypair();
//! let keyexchange_b = sm2::KeyExchange::new(idb, &skb);
//! let (b2a, rskb) = keyexchange_b.keyexchange_1ab(16);
//! // Step 2
//! // a side
//! let ka = keyexchange_a.keyexchange_2a(&rska, &b2a);
//! // b side
//! let kb = keyexchange_b.keyexchange_2b(&rskb, &a2b);
//! // Step 3
//! assert_eq!(ka.k, kb.k);
//! assert_eq!(ka.s12, kb.s12);
//! ```
//!
//! ### SM4 ECB Encrypt/Decrypt
//!
//! ```
//! use smcrypto::sm4;
//! let key = b"1234567812345678";
//! let sm4_ecb = sm4::CryptSM4ECB::new(key);
//! let enc_ecb = sm4_ecb.encrypt_ecb(b"abc");
//! let dec_ecb = sm4_ecb.decrypt_ecb(&enc_ecb);
//! assert_eq!(String::from_utf8(dec_ecb).unwrap(), "abc");
//! ```
//!
//! ### SM4 CBC Encrypt/Decrypt
//!
//! ```
//! use smcrypto::sm4;
//! let key = b"1234567812345678";
//! let iv = b"0000000000000000";
//! let sm4_cbc = sm4::CryptSM4CBC::new(key, iv);
//! let enc_cbc = sm4_cbc.encrypt_cbc(b"abc");
//! let dec_cbc = sm4_cbc.decrypt_cbc(&enc_cbc);
//! assert_eq!(String::from_utf8(dec_cbc).unwrap(), "abc");
//! ```