Rust区块琏开发——签名加密与私钥公钥

签名与加密

1.使用私钥加加密信息，然后用公钥解密信息，就是数学签名，签名的意义是保证信息的来源是私钥持有者。
2.使用公钥加密，私钥解密，就是加密传输，是为保证信息即使暴露出来也只有私钥持有者才能解密读懂。
3.要实现签名或者加密，一般分为三个步骤，生成密钥对算法，私钥签名算法，公钥验证算法。

代码示例

1.Rust提供了crypto库，它实现了包含了密码学中常用的对称密码、公钥密码、单向散列函数、消息认证码、数字签名、随机数生成器等算法等等。

2.这里签名要用到ed25519这人算法。

依赖

[dependencies]
rust-crypto = "^0.2"
secp256k1  = "0.23.1"
hex = "0.4.3"
sha256 = "1.0.3"
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对信息进行签名

fn sign(seed_key : String,content:String) -> ([u8;64],[u8;32],[u8;64])
{
    let seed_bytes = digest_bytes(seed_key.as_bytes());

    let seed_u8  = hex::decode(seed_bytes).expect("Invalid Hex String");
    let mut seed: [u8;32] = [0u8;32];

    let mut i = 0;
    for val in seed_u8
    {
        seed[i] = val;
        i = i+ 1;
    }

    let (private_key, public_key) = keypair(seed.as_ref()); //[U8,64]
    let sig = signature(content.as_bytes(), &private_key); //[U8,64]
    (private_key,public_key,sig)
}
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验证签名

	let seed = "3nuhx-7yzml-5uet3-7eplx-kq4u5-roww3-zf6ju-vdvaf-s7q4u".to_string();
    let content = "13445927681169508792";
    let (private_key,public_key,signature) = sign(seed, content.to_string());
    print!("private key = {:?},\npublic key = {:?},\nsignature = {:?} \n",private_key,public_key,signature);

    print!("verify = {:?}",verify(content.as_bytes(), &public_key, &signature));
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private key = [189, 205, 57, 2, 52, 206, 172, 150, 110, 248, 19, 146, 86, 244, 107, 190, 49, 227, 130, 188, 139, 207, 157, 94, 226, 25, 27, 15, 172, 38, 160, 108, 19, 100, 112, 203, 240, 28, 155, 193, 252, 17, 194, 53, 43, 146, 165, 135, 131, 100, 154, 142, 226, 120, 180, 51, 203, 162, 168, 38, 156, 49, 115, 95],
public key = [19, 100, 112, 203, 240, 28, 155, 193, 252, 17, 194, 53, 43, 146, 165, 135, 131, 100, 154, 142, 226, 120, 180, 51, 203, 162, 168, 38, 156, 49, 115, 95],
signature = [222, 13, 90, 4, 73, 2, 58, 240, 183, 110, 19, 120, 251, 76, 219, 9, 125, 151, 156, 218, 3, 12, 237, 209, 3, 237, 176, 152, 42, 201, 186, 113, 79, 66, 6, 249, 245, 232, 102, 29, 54, 184, 249, 31, 49, 135, 226, 164, 158, 245, 76, 213, 36, 191, 161, 44, 122, 132, 47, 221, 172, 46, 144, 1] 
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3.把签名转成String输出。

fn au8_to_string(signature_code : [u8;64]) ->String
{
    use std::fmt::Write;
    let mut signature_string = String::new();
    for a in signature_code.iter() 
    { 
        write!(signature_string, "{:02x}", a);
    }
    signature_string
}
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"de0d5a0449023af0b76e1378fb4cdb097d979cda030cedd103edb0982ac9ba714f4206f9f5e8661d36b8f91f3187e2a49ef54cd524bfa12c7a842fddac2e9001"
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