60 lines
1.7 KiB
JavaScript
60 lines
1.7 KiB
JavaScript
'use strict';
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var native = module.exports;
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// XXX added by caller: _stance, neuter
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var RSA = native;
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native.generate = function(opts) {
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var wcOpts = {};
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if (!opts) {
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opts = {};
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}
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if (!opts.kty) {
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opts.kty = 'RSA';
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}
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// Support PSS? I don't think it's used for Let's Encrypt
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wcOpts.name = 'RSASSA-PKCS1-v1_5';
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if (!opts.modulusLength) {
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opts.modulusLength = 2048;
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}
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wcOpts.modulusLength = opts.modulusLength;
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if (wcOpts.modulusLength >= 2048 && wcOpts.modulusLength < 3072) {
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// erring on the small side... for no good reason
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wcOpts.hash = { name: 'SHA-256' };
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} else if (wcOpts.modulusLength >= 3072 && wcOpts.modulusLength < 4096) {
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wcOpts.hash = { name: 'SHA-384' };
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} else if (wcOpts.modulusLength < 4097) {
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wcOpts.hash = { name: 'SHA-512' };
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} else {
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// Public key thumbprints should be paired with a hash of similar length,
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// so anything above SHA-512's keyspace would be left under-represented anyway.
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return Promise.Reject(
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new Error(
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"'" +
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wcOpts.modulusLength +
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"' is not within the safe and universally" +
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' acceptable range of 2048-4096. Typically you should pick 2048, 3072, or 4096, though other values' +
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' divisible by 8 are allowed. ' +
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RSA._stance
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)
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);
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}
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// TODO maybe allow this to be set to any of the standard values?
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wcOpts.publicExponent = new Uint8Array([0x01, 0x00, 0x01]);
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var extractable = true;
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return window.crypto.subtle
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.generateKey(wcOpts, extractable, ['sign', 'verify'])
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.then(function(result) {
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return window.crypto.subtle
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.exportKey('jwk', result.privateKey)
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.then(function(privJwk) {
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return {
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private: privJwk,
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public: RSA.neuter({ jwk: privJwk })
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};
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});
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});
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};
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