數位簽章：您的加密 John Hancock，Go Crypto 6-Golang-PHP中文網

Digital Signatures: Your Cryptographic John Hancock, Go Crypto 6

嘿，加密貨幣冠軍！準備好進入數位簽章的世界了嗎？將它們視為您的數位親筆簽名 - 一種證明您確實是數位世界中的您的方式，並且您的訊息未被篡改。讓我們探索 Go 如何幫助我們創建這些不可偽造的數字約翰漢考克！

RSA 簽名：經典簽名

首先，我們有 RSA 簽章。這就像用一支非常精美的、不可偽造的筆簽署一份文件。

import (
    "crypto"
    "crypto/rand"
    "crypto/rsa"
    "crypto/sha256"
    "fmt"
)

func main() {
    // Let's create our special signing pen (RSA key pair)
    privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
    if err != nil {
        panic("Oops! Our pen ran out of ink.")
    }
    publicKey := &privateKey.PublicKey

    // Our important message
    message := []byte("I solemnly swear that I am up to no good.")

    // Let's create a fingerprint of our message
    hash := sha256.Sum256(message)

    // Time to sign!
    signature, err := rsa.SignPKCS1v15(rand.Reader, privateKey, crypto.SHA256, hash[:])
    if err != nil {
        panic("Our hand cramped while signing!")
    }

    fmt.Printf("Our RSA signature: %x\n", signature)

    // Now, let's verify our signature
    err = rsa.VerifyPKCS1v15(publicKey, crypto.SHA256, hash[:], signature)
    if err != nil {
        fmt.Println("Uh-oh, someone forged our signature!")
    } else {
        fmt.Println("Signature checks out. Mischief managed!")
    }
}

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ECDSA 簽名：曲線簽名

接下來，我們有 ECDSA 簽名。它就像 RSA 更酷、更有效率的表親 - 具有相同安全等級的更小的簽名。

import (
    "crypto/ecdsa"
    "crypto/elliptic"
    "crypto/rand"
    "crypto/sha256"
    "fmt"
    "math/big"
)

func main() {
    // Let's create our curvy signing pen
    privateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
    if err != nil {
        panic("Our curvy pen got a bit too curvy!")
    }
    publicKey := &privateKey.PublicKey

    // Our important message
    message := []byte("Elliptic curves are mathematically delicious!")

    // Create a fingerprint of our message
    hash := sha256.Sum256(message)

    // Time to sign with our curvy pen!
    r, s, err := ecdsa.Sign(rand.Reader, privateKey, hash[:])
    if err != nil {
        panic("Our hand slipped while signing these curves!")
    }

    signature := append(r.Bytes(), s.Bytes()...)
    fmt.Printf("Our curvy ECDSA signature: %x\n", signature)

    // Let's verify our curvy signature
    r = new(big.Int).SetBytes(signature[:len(signature)/2])
    s = new(big.Int).SetBytes(signature[len(signature)/2:])
    valid := ecdsa.Verify(publicKey, hash[:], r, s)
    fmt.Printf("Is our curvy signature valid? %v\n", valid)
}

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Ed25519 簽名：速度惡魔親筆簽名

最後，我們有 Ed25519 簽名。它們就像數位簽名的跑車 - 快速且安全。

import (
    "crypto/ed25519"
    "crypto/rand"
    "fmt"
)

func main() {
    // Let's create our speedy signing pen
    publicKey, privateKey, err := ed25519.GenerateKey(rand.Reader)
    if err != nil {
        panic("Our speedy pen got a speeding ticket!")
    }

    // Our important message
    message := []byte("Speed is my middle name!")

    // Time to sign at lightning speed!
    signature := ed25519.Sign(privateKey, message)

    fmt.Printf("Our speedy Ed25519 signature: %x\n", signature)

    // Let's verify our speedy signature
    valid := ed25519.Verify(publicKey, message, signature)
    fmt.Printf("Is our speedy signature valid? %v\n", valid)
}

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