用TypeScript实现HMACSHA1算法
时间: 2023-10-13 09:23:11 浏览: 67
以下是用 TypeScript 实现 HMAC-SHA1 算法的示例代码:
```typescript
function hmacSha1(key: string, data: string): string {
const keyBytes = new TextEncoder().encode(key);
const dataBytes = new TextEncoder().encode(data);
const blocksize = 64;
const ipad = new Uint8Array(blocksize);
const opad = new Uint8Array(blocksize);
for (let i = 0; i < blocksize; i++) {
ipad[i] = 0x36;
opad[i] = 0x5c;
}
const keyLen = keyBytes.length > blocksize ? sha1(keyBytes).length : blocksize;
const paddedKey = new Uint8Array(blocksize);
paddedKey.set(keyBytes.slice(0, keyLen));
const innerBlock = new Uint8Array(blocksize + dataBytes.length);
innerBlock.set(ipad);
innerBlock.set(paddedKey, blocksize);
innerBlock.set(dataBytes, blocksize + keyLen);
const innerHash = sha1(innerBlock);
const outerBlock = new Uint8Array(blocksize + innerHash.length);
outerBlock.set(opad);
outerBlock.set(paddedKey, blocksize);
outerBlock.set(innerHash, blocksize);
return sha1(outerBlock);
}
function sha1(data: Uint8Array): string {
const buffer = new Uint8Array(data);
const words = new Array<number>(80);
let h0 = 0x67452301;
let h1 = 0xefcdab89;
let h2 = 0x98badcfe;
let h3 = 0x10325476;
let h4 = 0xc3d2e1f0;
bufferToWords(buffer, words);
for (let i = 16; i < 80; i++) {
words[i] = rotateLeft(words[i - 3] ^ words[i - 8] ^ words[i - 14] ^ words[i - 16], 1);
}
for (let i = 0; i < 80; i++) {
let f: number;
let k: number;
if (i < 20) {
f = (h1 & h2) | (~h1 & h3);
k = 0x5a827999;
} else if (i < 40) {
f = h1 ^ h2 ^ h3;
k = 0x6ed9eba1;
} else if (i < 60) {
f = (h1 & h2) | (h1 & h3) | (h2 & h3);
k = 0x8f1bbcdc;
} else {
f = h1 ^ h2 ^ h3;
k = 0xca62c1d6;
}
const temp = (rotateLeft(h0, 5) + f + h4 + k + words[i]) >>> 0;
h4 = h3;
h3 = h2;
h2 = rotateLeft(h1, 30);
h1 = h0;
h0 = temp;
}
const result = new Uint8Array(20);
wordsToBuffer([h0, h1, h2, h3, h4], result);
return Array.from(result, byteToHex).join('');
}
function bufferToWords(buffer: Uint8Array, words: Array<number>): void {
for (let i = 0; i < buffer.length; i += 4) {
words[i / 4] = (buffer[i] << 24) | (buffer[i + 1] << 16) | (buffer[i + 2] << 8) | buffer[i + 3];
}
}
function wordsToBuffer(words: Array<number>, buffer: Uint8Array): void {
for (let i = 0; i < buffer.length; i += 4) {
buffer[i] = (words[i / 4] >>> 24) & 0xff;
buffer[i + 1] = (words[i / 4] >>> 16) & 0xff;
buffer[i + 2] = (words[i / 4] >>> 8) & 0xff;
buffer[i + 3] = words[i / 4] & 0xff;
}
}
function rotateLeft(value: number, count: number): number {
return ((value << count) | (value >>> (32 - count))) >>> 0;
}
function byteToHex(byte: number): string {
return ('0' + byte.toString(16)).slice(-2);
}
```
此代码使用了 `TextEncoder` 类将字符串转换为字节数组,因此需要在支持该类的环境中运行。如果需要在不支持 `TextEncoder` 类的环境中运行,可以使用其他方法将字符串转换为字节数组。