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88 lines
2.5 KiB
88 lines
2.5 KiB
const {KJUR, hextob64} = require('jsrsasign')
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const HashMap = {
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SHA256withRSA: 'SHA256withRSA',
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SHA1withRSA: 'SHA1withRSA'
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}
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const PEM_BEGIN = '-----BEGIN PRIVATE KEY-----\n'
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const PEM_END = '\n-----END PRIVATE KEY-----'
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/**
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* rsa签名参考：https://www.jianshu.com/p/145eab95322c
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*/
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exports.SignUtil = {
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/**
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* 创建签名
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* @param params 请求参数
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* @param privateKey 私钥，PKCS8
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* @param signType 签名类型，RSA,RSA2
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* @returns 返回签名内容
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*/
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createSign(params, privateKey, signType) {
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const content = this.getSignContent(params)
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return this.sign(content, privateKey, signType)
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},
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sign: function (content, privateKey, signType) {
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if (signType.toUpperCase() === 'RSA') {
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return this.rsaSign(content, privateKey, HashMap.SHA1withRSA)
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} else if (signType.toUpperCase() === 'RSA2') {
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return this.rsaSign(content, privateKey, HashMap.SHA256withRSA)
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} else {
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throw 'signType错误'
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}
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},
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/**
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* rsa签名
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* @param content 签名内容
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* @param privateKey 私钥
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* @param hash hash算法，SHA256withRSA，SHA1withRSA
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* @returns 返回签名字符串，base64
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*/
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rsaSign: function (content, privateKey, hash) {
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privateKey = this._formatKey(privateKey)
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// 创建 Signature 对象
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const signature = new KJUR.crypto.Signature({
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alg: hash,
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//!这里指定 私钥 pem!
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prvkeypem: privateKey
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})
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signature.updateString(content)
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const signData = signature.sign()
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// 将内容转成base64
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return hextob64(signData)
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},
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_formatKey: function (key) {
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if (!key.startsWith(PEM_BEGIN)) {
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key = PEM_BEGIN + key
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}
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if (!key.endsWith(PEM_END)) {
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key = key + PEM_END
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}
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return key
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},
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/**
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* 获取签名内容
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* @param params 请求参数
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* @returns {string}
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*/
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getSignContent: function (params) {
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const paramNames = []
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for(const key in params) {
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paramNames.push(key)
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}
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paramNames.sort()
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const paramNameValue = []
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for (let i = 0, len = paramNames.length; i < len; i++) {
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const paramName = paramNames[i];
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const val = params[paramName];
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if (paramName && val) {
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paramNameValue.push(`${paramName}=${val}`)
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}
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}
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return paramNameValue.join('&')
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}
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}
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