How to use key in javascript sha1 decryption

SHA-1 (Secure Hash Algorithm 1) is an encryption algorithm mainly used to protect the integrity of data and verify the integrity of files. In JavaScript programming, the SHA-1 algorithm is often used to generate secure hash values ​​to ensure that data is not tampered with during transmission.

When using the SHA-1 algorithm for encryption, we usually need a key value, which is used to encrypt and decrypt data. The key value "authorizes" the encrypted data so that only authorized users can decrypt the data. So, how to use key in JavaScript SHA-1 decryption?

First of all, we need to make it clear that the SHA-1 algorithm can only generate hash values, but cannot perform encryption and decryption operations. Therefore, when using the SHA-1 algorithm for encryption and decryption, we usually use hash values ​​instead of encrypted data. In this way, only users who know the key value can decrypt the hash value into plaintext data through the SHA-1 algorithm.

Then, when using JavaScript SHA-1 decryption, the key value is usually used in the following two situations:

1. Verify that the hash value is correct

When using the SHA-1 algorithm to encrypt data, the original data is usually converted into binary format first, and then the corresponding hash value is generated. This hash value usually consists of a fixed-length string of characters, such as 40 characters. When decrypting a hash value, we usually need to use the same key value and SHA-1 algorithm to generate a hash value, and then compare the two hash values. If the two hash values ​​are the same, the verification is successful, indicating that the hash value is correct, otherwise the verification fails, indicating that the hash value has been tampered with.

In the code, you can use the following method to verify whether the hash value is correct:

const sha1 = require('sha1');
const key = 'mykey'; // key值
const originalData = 'mydata'; // 原始数据
const encryptedData = sha1(key+originalData); // 用key值和SHA-1算法加密数据

// 假设encryptedData是由网络传输过来的哈希值
const receivedData = '8cb2237d0679ca88db6464eac60da96345513964';
if (encryptedData === receivedData) {
    console.log('验证成功');
} else {
    console.log('验证失败');
}

In the above code, we use the sha1 library to generate the hash value of the SHA-1 algorithm encrypted data , which is then compared to the hash value received from the network. If the two hash values ​​are the same, the verification succeeds, otherwise the verification fails.

2. Encrypted Hash Value

Sometimes, we need to re-encrypt the hash value encrypted by the SHA-1 algorithm to improve data security. At this time, we can use the key value to encrypt the hash value, and then transmit the encrypted data to the recipient. The receiver also needs to use the same key value to decrypt the encrypted data to obtain the original hash value.

In the code, you can use the following method to encrypt the hash value:

const sha1 = require('sha1');
const key = 'mykey'; // key值
const originalData = 'mydata'; // 原始数据
const encryptedData = sha1(key+originalData); // 用key值和SHA-1算法加密数据

const encrypt = (data, key) => {
    // AES算法加密
    return encryptedData; // 假设使用AES算法加密过程省略，直接返回加密后的数据
};

// 将经过SHA-1算法加密的哈希值进行二次加密
const encryptedHash = encrypt(encryptedData, key);
console.log(encryptedHash);

In the above code, we use the encrypt method to encrypt the hash value encrypted by the SHA-1 algorithm. Secondary encryption. Here we use the AES algorithm to encrypt the data and then return the encrypted data. In this way, the receiver also needs to use the same key value to decrypt the encrypted data to obtain the original hash value.

Summary

In JavaScript programming, when using the SHA-1 algorithm for encryption and decryption, we usually need to use the key value to encrypt and decrypt the data. When verifying that the hash value is correct, we need to generate the hash value using the same key value and SHA-1 algorithm and compare it with the received hash value. When performing secondary encryption on the hash value, we need to use AES or other encryption algorithms to encrypt the data. No matter what the situation is, the key value is an important guarantee to ensure data security.

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