js中的web加密

window.crypto.subtle只会在安全模式下有用，也就是https环境下

1. 创建摘要（硬解）

   var i = new TextEncoder('utf-8').encode("Hello World!");crypto.subtle.digest('SHA-256', i).then(function(digest) {    var view = new DataView(digest);    var str = '';    for(var i = 0; i < view.byteLength; i++) {        var b = view.getUint8(i);        str += '0123456789abcdef'[(b & 0xf0) >> 4];        str += '0123456789abcdef'[(b & 0x0f)];    }    console.log(str); // 7f83b1657ff1fc53b92dc18148a1d65dfc2d4b1fa3d677284addd200126d9069    var arr = new Uint8Array(digest);    console.log(arr);}).catch(function(err) {    console.log(err);})

2. 创建摘要（软解）

   const text = 'Hello World!';const encoder = new TextEncoder();const data = encoder.encode(text);window.crypto.subtle.digest('SHA-256', data).then(digestValue => {    const byteArray = new Uint8Array(digestValue);    const hexCodes = [...byteArray].map(value => {        const hexCode = value.toString(16);        const paddedHexCode = hexCode.padStart(2, '0');        return paddedHexCode;    });    console.log(hexCodes.join(''));});

3. 加密随机数

   var arr = new Uint8Array(5);crypto.getRandomValues(arr);

4. 创建PEM格式的RSA-OAEP私钥

   function arrayBufferToBase64(arrayBuffer) {    var byteArray = new Uint8Array(arrayBuffer);    var byteString = "";    for(var i = 0; i < byteArray.byteLength; i++) {        byteString += String.fromCharCode(byteArray[i]);    }    var b64 = window.btoa(byteString);    return b64}function addNewLines(str) {    var finalString = '';    while(str.length > 0) {        finalString += str.substring(0, 64) + '\n';        str = str.substring(64);    }    return finalString;}function toPem(privateKey) {    var b64 = addNewLines(arrayBufferToBase64(privateKey));    var pem = "-----BEGIN PRIVATE KEY-----\n" + b64 + "-----END PRIVATE KEY-----"    return pem;}window.crypto.subtle.generateKey(    {        name: "RSA-OAEP",        modulusLength: 2048,        publicExponent: new Uint8Array([0x01, 0x00, 0x01]),        hash: {name: "SHA-256"}    },    true,    ["encrypt", "decrypt"]).then(function(keyPair){    window.crypto.subtle.exportKey("pkcs8", keyPair.privateKey).then(function(exportedPrivateKey){        var pem = toPem(exportedPrivateKey);        console.log(pem);    }).catch(function(err){        console.log(err);    })})运行上面代码    -----BEGIN PRIVATE KEY-----    MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQDVh3Q1faf2SSsF    M8yVqSCTgSSdEpbRepE2mzG03mq2CUpu+yGJo2U+JyqVJVorcFRBcu5fLNtXrizp    cMu5AsYSJ60HXi4us3UlIIDJm+lLVCYzD3C8bttGUglbTDo3JY1xrQ+1SVCjop33    NSBgmSl48q0zLKz9r9g7hk+cRPQ5xiDn9pP7N3tIC+dVJg+wlT79XJ4bkHQo/wA7    aNKb27MJ0pKKZXDl2iDjKxryVATunzBHbmoQ0je3iQwS2Eup9UHH/STO0Gzn81jr    0fpqtZsRSfpzBwgqKgckDQkW5TB9Bn9mhM/lnYU3PBlnea3ohLaxGc+RQy2IC4oA    3dCnHOjFAgMBAAECggEAZG6umQ4+NxgZFPxVKLuA6AAhIYQBzguRS5bZXVIT7QUX    rnWOQ7fHweEYJUiJTc8qwhH1zmxBys7Qrwfvulh0o0toFgQVQsADxG+yQ6GCrHyq    7u8/PlIB7uRdJEUJSLDwA1y7+6+9LwootIKXdPf1Sr8R+fT0dOoFkZHN1hmUqasL    ch95JLkCJZ8ELZU2IJ5H8R4qDDRiUI1/zaGAFO1DCbGNRWpqTs/MVMTp7wMh3oN0    ZYFGgmibWv8WALxpsSX+mT9JkPHn7ljlXNVWfi+J1qy8h6YcQW4nArcDPpomPIpN    9y3UfsHOHSE39d5AGEWhw2syk+PxSaKnqbW6nrGeDQKBgQD8RIPt9x5n/hnJpCaE    5o46qUrlYkIJk49t73Bqhr2k1StbaUFu9qF9G+PP/hsJRPJEWXyKvVfb6BNZsgbP    gPMbBmsXwnobd+XWqChx6HJE09obF1GSQjXov/t4nFzdNxTrXzhMjbyTw4N72CyX    1+QFZAn9GRXiben9W05XmSa5wwKBgQDYsDaVvJdR5yYU6pkcgDnr7NZ9RAMPraVz    dZvbzvIwZcOE1tBhCFODbQsPObWkLFFinaWiAUZOIIur858UJxWSCZVqgHg6bk9n    F7+Hw+4T/VnrurqNY1H4IY/5bFPqArXrat5b49CGfj/C2Se/WUG5p8bt/cY4HLbg    0HgGd7ki1wKBgQDEDKtLIKXsw7lez8dvuY4HYNHn+ri/oIHzOgXvg8+WbmRHokFL    7zgJdsdROXXhekedfr4fRI8nQ/Dl4EkSsnA8LHzF9knXVxK0A/OKss87VjlGnJS0    SeiDfc/9J+ezs776PQIP3IcVfviMIrBlQU7gMaLho8EyO6GBWJhF06wY6QKBgChv    yd/rj7mDD0I7/VKqQyTZz7UUqhWU7Bk9y1YbqmqJsxDpHX3eFeeiw7uVo2X9tzpV    /QDciAgwXqA6GGekW4wjKbT0QHt29m5gqidl0tn8H3m0IPgdnsBVUw7Svl4fH1/N    U62GN/XBPZjY+Wfl+jPxMVhcUU9LXH1bqepbETuFAoGAQiHF8bPTSqPcCQ0AvQzG    h5RK/K1LkoATXkxgJY+Te7jws6Ru/U6mFD7KDeUw3GeuSiMYZY/9eUnOq0WKfNg4    fg4S7vqYvzyISdMj77CyHhQPcnZ6KqtdBS2D3NPqf/aG9OjfftRDXe0kZP0v0YNF    DU2EjlbkOZPIVrZZ0THSUIo=    -----END PRIVATE KEY-----

5. 使用上面创建的私钥

   var pkey = `-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----`function removeLines(str) {    return str.replace("\n", "");}function base64ToArrayBuffer(b64) {    var byteString = window.atob(b64);    var byteArray = new Uint8Array(byteString.length);    for(var i = 0; i < byteString.length; i++) {        byteArray[i] = byteString.charCodeAt(i);    }    return byteArray;}function pemToArrayBuffer(pem) {    var b64Lines = removeLines(pem);    var b64Prefix = b64Lines.replace("-----BEGIN PRIVATE KEY-----", '');    console.log(b64Prefix)    var b64Final = b64Prefix.replace("-----END PRIVATE KEY-----", '');    return base64ToArrayBuffer(b64Final);}window.crypto.subtle.importKey(    "pkcs8",     pemToArrayBuffer(pkey),     {name: "RSA-OAEP", hash: {name: "SHA-256"}},    true,    ['decrypt']).then(function(importedPrivateKey){    console.log(importedPrivateKey);}).catch(function(err){    console.log(err);})