How to set up golang signature

With the continuous improvement of network security awareness, more and more applications require signature verification. For programs developed using the Go language, the official provides a set of mechanisms for signature setting and verification. This article will introduce Golang’s signature settings in detail.

1. What is a signature

In the computer field, a signature is a method of digital authentication. By encrypting the hash value of the file, the integrity of the file can be ensured. Identity and credibility. Signature technology is widely used in fields such as software license authentication, file integrity verification, digital copyright protection, and information security.

2. Principle of Golang signature

Golang signature uses a public key encryption algorithm, that is to say, the signature process requires two keys, the public key and the private key. The public key can be made public and is used to encrypt and verify signatures, while the private key must be kept secret and is used to decrypt and generate signatures.

The principle of Golang signature is as follows:

a. Generate an RSA private key, the length is generally 1024 bits or 2048 bits.

b. Generate a public key through the private key, and obtain the signature corresponding to the private key through the public key.

c. Hash the data to generate a digest before sending it to the receiver. The digest is then encrypted using the private key to generate a signature.

d. After the receiver receives the data, it also performs hash processing. If the generated hash value is the same as the value in the signature, the data is considered to have not been tampered with.

3. Implementation of Golang signature

In Golang, you can use the crypto package to implement the signature mechanism. First, you need to generate the public key and private key:

privateKey,err := rsa.GenerateKey(rand.Reader, 2048) if err != nil { log.Fatalf("error generating private key:%s", err.Error()) } publicKey := &privateKey.PublicKey

Then, you can use the private key to sign the data and transmit the signature and data to the recipient.

h := sha256.New() h.Write([]byte("Hello,world!")) hashed := h.Sum(nil) signature, err := rsa.SignPKCS1v15(rand.Reader, privateKey, crypto.SHA256, hashed) if err != nil { log.Fatalf("error signing message:%s", err.Error()) } msg := "Hello,world!"

The receiver can use the public key to verify the signature and determine whether the data has been tampered with:

h := sha256.New() h.Write([]byte("Hello,world!")) hashed := h.Sum(nil) err = rsa.VerifyPKCS1v15(publicKey, crypto.SHA256, hashed, signature) if err != nil { log.Fatalf("error verifying signature:%s", err.Error()) } fmt.Println(msg)

4. Summary

Through the above example, It can be seen that Golang signature setting is very convenient and fast, and can ensure the integrity and security of data. In practical applications, attention should be paid to keeping the private key confidential to prevent leakage.

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