97 lines
2.9 KiB
Markdown
97 lines
2.9 KiB
Markdown
# rsa-compat.js
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JavaScript RSA utils that work on Windows, Mac, and Linux with or without C compiler
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In order to provide a module that "just works" everywhere, we mix and match methods
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from `node.js` core, `ursa`, `forge`, and others.
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(in the future we'd like to provide the same API to the browser)
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Examples
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--------
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Generate an RSA Keypair:
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```javascript
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var RSA = require('rsa-compat').RSA;
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var bitlen = 1024;
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var exp = 65537;
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var options = { public: true, pem: true, internal: true };
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RSA.generateKeypair(bitlen, exp, options, function (err, keypair) {
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console.log(keypair);
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});
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```
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Here's what the object might look like:
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`console.log(keypair)`:
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```javascript
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{ publicKeyPem: '-----BEGIN RSA PUBLIC KEY-----\n/*base64 pem-encoded string*/'
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, privateKeyPem: '-----BEGIN RSA PRIVATE KEY-----\n/*base64 pem-encoded string*/'
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, privateKeyJwk: {
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kty: "RSA"
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, n: '/*base64 modulus n = pq*/'
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, e: '/*base64 exponent (usually 65537)*/'
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, d: '/*base64 private exponent (d = e^−1 (mod ϕ(n))/'
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, p: '/*base64 first prime*/'
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, q: '/*base64 second prime*/'
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, dp: '/*base64 first exponent for Chinese remainder theorem (dP = d (mod p−1))*/'
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, dq: '/*base64 Second exponent, used for CRT (dQ = d (mod q−1))/'
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, qi: '/*base64 Coefficient, used for CRT (qinv = q^−1 (mod p))*/'
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}
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, publicKeyJwk: {
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kty: "RSA"
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, n: '/*base64 modulus n = pq*/'
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, e: '/*base64 exponent (usually 65537)*/'
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}
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, _ursa: '/*undefined or intermediate ursa object*/'
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, _ursaPublic: '/*undefined or intermediate ursa object*/'
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, _forge: '/*undefined or intermediate forge object*/'
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, _forgePublic: '/*undefined or intermediate forge object*/'
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}
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```
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NOTE: this object is JSON safe as _ursa and _forge will be ignored
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See http://crypto.stackexchange.com/questions/6593/what-data-is-saved-in-rsa-private-key to learn a little more about the meaning of the specific fields in the JWK.
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API
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---
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* `RSA.generateKeypair(bitlen, exp, options, cb)`
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* `RSA.exportPrivatePem(keypair)`
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* `RSA.exportPublicPem(keypair)`
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* `RSA.exportPrivateJwk(keypair)`
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* `RSA.exportPublicJwk(keypair)`
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`keypair` can be any object with any of these keys `publicKeyPem, privateKeyPem, publicKeyJwk, privateKeyJwk`
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### RSA.generateKeypair(bitlen, exp, options, cb)
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Create a private keypair and export it as PEM, JWK, and/or internal formats
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```javascript
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RSA.generateKeypair(null, null, null, function (keypair) { /*...*/ });
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RSA.generateKeypair(1024, 65537, { pem: false, public: false, internal: false }, function (keypair) { /*...*/ });
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```
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`bitlen`: *1024* (default), 2048, or 4096
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`exp`: *65537* (default)
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`options`:
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```javascript
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{ public: false // export public keys
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, pem: false // export pems
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, jwk: true // export jwks
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, internal: false // preserve internal intermediate formats (_ursa, _forge)
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, thumbprint: false // JWK sha256 thumbprint
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, fingerprint: false // NOT IMPLEMENTED (RSA key fingerprint)
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}
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```
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