update name: convertIfEcdsa => ecdsaAsn1SigToJoseSig

README.md

@@ -29,26 +29,50 @@ and [Rasha.js (RSA)](https://git.coolaj86.com/coolaj86/rasha.js/).
 
 # Usage
 
-A brief (albeit somewhat nonsensical) introduction to the APIs:
+A brief introduction to the APIs:
 
 ```
+// generate a new keypair as jwk
+// (defaults to EC P-256 when no options are specified)
 Keypairs.generate().then(function (pair) {
-  return Keypairs.export({ jwk: pair.private }).then(function (pem) {
+  console.log(pair.private);
+  console.log(pair.public);
+});
+```
+
+```
+// JWK to PEM
+// (supports various 'format' and 'encoding' options)
+return Keypairs.export({ jwk: pair.private, format: 'pkcs8' }).then(function (pem) {
+  console.log(pem);
+});
+```
+
+```
+// PEM to JWK
 return Keypairs.import({ pem: pem }).then(function (jwk) {
+  console.log(jwk);
+});
+```
+
+```
+// Thumbprint a JWK (SHA256)
 return Keypairs.thumbprint({ jwk: jwk }).then(function (thumb) {
   console.log(thumb);
+});
+```
+
+```
+// Sign a JWT (aka compact JWS)
 return Keypairs.signJwt({
-          jwk: keypair.private
+  jwk: pair.private
+, iss: 'https://example.com'
+, exp: '1h'
+  // optional claims
 , claims: {
-            iss: 'https://example.com'
   , sub: 'jon.doe@gmail.com'
-          , exp: Math.round(Date.now()/1000) + (3 * 24 * 60 * 60)
   }
 });
-      });
-    });
-  });
-});
 ```
 
 By default ECDSA keys will be used since they've had native support in node
@@ -56,9 +80,9 @@ _much_ longer than RSA has, and they're smaller, and faster to generate.
 
 ## API Overview
 
-* generate
-* parse
-* parseOrGenerate
+* generate (JWK)
+* parse (PEM)
+* parseOrGenerate (PEM to JWK)
 * import (PEM-to-JWK)
 * export (JWK-to-PEM, private or public)
 * publish (Private JWK to Public JWK)
@@ -141,9 +165,22 @@ Options
 }
 ```
 
-#### Keypairs.publish({ jwk: jwk })
+#### Keypairs.publish({ jwk: jwk, exp: '3d', use: 'sig' })
 
-**Synchronously** strips a key of its private parts and returns the public version.
+Promises a public key that adheres to the OIDC and Auth0 spec (plus expiry), suitable to be published to a JWKs URL:
+
+```
+{ "kty": "EC"
+, "crv": "P-256"
+, "x": "..."
+, "y": "..."
+, "kid": "..."
+, "use": "sig"
+, "exp": 1552074208
+}
+```
+
+In particular this adds "use" and "exp".
 
 #### Keypairs.thumbprint({ jwk: jwk })
 
@@ -155,11 +192,17 @@ Returns a JWT (otherwise known as a protected JWS in "compressed" format).
 
 ```js
 { jwk: jwk
+  // required claims
+, iss: 'https://example.com'
+, exp: '15m'
+  // all optional claims
 , claims: {
   }
 }
 ```
 
+Exp may be human readable duration (i.e. 1h, 15m, 30s) or a datetime in seconds.
+
 Header defaults:
 
 ```js

bin/keypairs.js

@@ -1,581 +1,12 @@
 #!/usr/bin/env node
 'use strict';
 
-// I'm not proud of the way this code is written - it snowballed from a thought
-// experiment into a full-fledged CLI, literally overnight (as it it's 4:30am
-// right now), but I love what it accomplishes!
-
-/*global Promise*/
-var fs = require('fs');
-var Rasha = require('rasha');
-var Eckles = require('eckles');
-var Keypairs = require('../');
-var pkg = require('../package.json');
-
-var args = process.argv.slice(2);
-var opts = { jwks: [], jwts: [], jwss: [], payloads: [], names: [], filenames: [], files: [], pems: [] };
-var conflicts = {
-  'namedCurve': 'modulusLength'
-, 'public': 'private'
-};
-Object.keys(conflicts).forEach(function (k) {
-  conflicts[conflicts[k]] = k;
-});
-function set(key, val) {
-  if (opts[conflicts[key]]) {
-    console.error("cannot set '" + key + "' to '" + val + "': '" + conflicts[key] + "' already set as '" + opts[conflicts[key]] + "'");
-    process.exit(1);
-  }
-  if (opts[key]) {
-    console.error("cannot set '" + key + "' to '" + val + "': already set as '" + opts[key] + "'");
-    process.exit(1);
-  }
-  opts[key] = val;
-}
-
-// duck type all the things
-// TODO segment off by actions (gen, sign, verify) and allow parse/convert or gen before sign
-args.forEach(function (arg) {
-  var larg = arg.toLowerCase().replace(/[^\w]/g, '');
-  var narg = parseInt(arg, 10) || 0;
-  if (narg.toString() !== arg) {
-    // i.e. 2048.pem is a valid file name
-    narg = false;
-  }
-
-  if ('version' === arg) {
-    console.info(pkg.name, 'v' + pkg.version);
-    process.exit(0);
-  }
-
-  if (setTimes(arg)) {
-    return;
-  }
-  if (setIssuer(arg)) {
-    return;
-  }
-  if (setSubject(arg)) {
-    return;
-  }
-
-  if ('ecdsa' === larg || 'ec' === larg) {
-    set('kty', "EC");
-    if (opts.modulusLength) {
-      console.error("EC keys do not have bit lengths such as '" + opts.modulusLength + "'. Choose either the P-256 or P-384 'curve' instead.");
-      process.exit(1);
-    }
-  }
-  if ('rsa' === larg) {
-    set('kty', "RSA");
-    if (opts.namedCurve) {
-      console.error("RSA keys do not have curves such as '" + opts.namedCurve + "'. Choose a modulus bit length, such as 2048 instead.");
-      process.exit(1);
-    }
-    return;
-  }
-
-  // P-384
-  if (-1 !== ['256', 'p256', 'prime256v1', 'secp256r1'].indexOf(larg)) {
-    set('namedCurve', "P-256");
-    return;
-  }
-
-  // P-384
-  if (-1 !== ['384', 'p384', 'secp384r1'].indexOf(larg)) {
-    set('namedCurve', "P-384");
-    return;
-  }
-
-  // RSA Modulus Length
-  if (narg) {
-    if (narg < 2048 || narg % 8 || narg > 8192) {
-      console.error("RSA modulusLength must be >=2048, <=8192 and divisible by 8");
-      process.exit(1);
-    }
-    set('modulusLength', narg);
-    return;
-  }
-
-  // Booleans
-  if (-1 !== [ 'private', 'public', 'nocompact', 'nofetch', 'debug', 'overwrite' ].indexOf(arg)) {
-    console.log(arg);
-    set(arg, true);
-    return;
-  }
-  if ('uncompressed' === arg) {
-    set('uncompressed', true);
-    return;
-  }
-  if (-1 !== [ 'gen', 'sign', 'verify', 'decode' ].indexOf(arg)) {
-    set('action', arg);
-    return;
-  }
-
-  // Key format and encoding
-  if (-1 !== [ 'spki', 'pkix' ].indexOf(larg)) {
-    set('pubFormat', 'spki');
-    return;
-  }
-  // TODO add ssh private key support (it's already built in jwk-to-ssh)
-  if ('ssh' === larg) {
-    set('pubFormat', 'ssh');
-    return;
-  }
-  if (-1 !== [ 'openssh', 'sec1', 'pkcs1', 'pkcs8' ].indexOf(larg)) {
-    // pkcs1 can be public or private, it's ambiguous
-    if (!opts.privFormat) {
-      set('privFormat', larg);
-      return;
-    }
-
-    if ('pkcs1' === larg || 'ssh' === larg) {
-      set('pubFormat', larg);
-      return;
-    }
-    if ('openssh' === larg) {
-      console.warn("specifying 'openssh' twice? ...assuming that you meant 'ssh'");
-      set('pubFormat', 'ssh');
-      return;
-    }
-    if ('pkcs8' === larg) {
-      console.warn("specifying 'pkcs8' twice? ...assuming that you meant 'spki' (pkix)");
-      set('pubFormat', 'spki');
-      return;
-    }
-    if ('sec1' === larg) {
-      console.warn("specifying 'sec1' twice? ...assuming that you meant 'spki' (pkix)");
-      set('pubFormat', 'spki');
-      return;
-    }
-    return;
-  }
-  if ('jwk' === larg) {
-    if (!opts.privFormat) {
-      set('privFormat', larg);
-    } else {
-      set('pubFormat', larg);
-    }
-    return;
-  }
-  if ('pem' === larg || 'der' === larg || 'json' === larg) {
-    if (!opts.privEncoding) {
-      set('privEncoding', larg);
-    } else {
-      set('pubEncoding', larg);
-    }
-    return;
-  }
-
-  // Filename
-  try {
-    fs.accessSync(arg);
-    opts.filenames.push(arg);
-    opts.names.push({ taken: true, name: arg });
-    if (!guessFile(arg)) {
-      opts.files.push(arg);
-    }
-    return;
-  } catch(e) { /* not keypath */ }
-
-  // Test for JWK-ness / payload-ness
-  if (guess(arg)) {
-    return;
-  }
-
-  // Test for JWT-ness
-  if (setJwt(arg)) {
-    return;
-  }
-
-  // Possibly the output file
-  if (!opts.extra1) {
-    opts.extra1 = arg;
-    opts.names.push({ taken: false, name: arg });
-    return;
-  }
-  if (!opts.extra2) {
-    opts.extra2 = arg;
-    opts.names.push({ taken: false, name: arg });
-    return;
-  }
-  // check if it's a valid output key
-
-  console.error("too many arguments or didn't understand argument '" + arg + "'");
-  if (opts.debug) {
-    console.warn(opts);
-  }
-  process.exit(1);
-});
-
-function guessFile(filename) {
-  try {
-    // TODO der support
-    var txt = fs.readFileSync(filename).toString('utf8');
-    return guess(txt, filename);
-  } catch(e) {
-    return false;
-  }
-}
-
-function guess(txt, filename) {
-  try {
-    var json = JSON.parse(txt);
-    if (-1 !== [ 'RSA', 'EC' ].indexOf(json.kty)) {
-      opts.jwks.push({ jwk: json, filename: filename });
-      return true;
-    } else if (json.signature && json.payload && (json.header || json.protected)) {
-      opts.jwss.push(json);
-      return true;
-    } else {
-      opts.payloads.push(txt);
-      return true;
-    }
-  } catch(e) {
-    try {
-      var pem = Eckles.importSync({ pem: txt });
-      // pem._string = txt;
-      opts.pems.push(pem);
-      return true;
-    } catch(e) {
-      try {
-        var pem = Rasha.importSync({ pem: txt });
-        // pem._string = txt;
-        opts.pems.push(pem);
-        return true;
-      } catch(e) {
-        // ignore
-      }
-    }
-  }
-  return false;
-}
-
-// node bin/keypairs.js debug spki pem json pkcs1 ~/.ssh/id_rsa.pub foo.pem bar.pem 'abc.abc.abc' '{"kty":"EC"}' '{}' '{"signature":"x", "payload":"x", "header":"x"}' '{"signature":"x", "payload":"x", "protected":"x"}' verify
-if (opts.debug) {
-  console.warn(opts);
-}
-
-var kp;
-
-if ('gen' === opts.action || (!opts.action && !opts.names.length)) {
-  if (opts.names.length > 2) {
-    console.error("there should only be two output files at most when generating keypairs");
-    console.error(opts.names.map(function (t) { return t.name; }));
-    process.exit(1);
-    return;
-  }
-
-  kp = genKeypair();
-} else if ('decode' === opts.action) {
-  if (!opts.jwts.length) {
-    console.error("no JWTs specified to decode");
-    process.exit(1);
-    return;
-  }
-
-  return Promise.all(opts.jwts.map(function (jwt, i) {
-    try {
-      var decoded = decodeJwt(jwt);
-      console.info("Decoded #" + (i + 1) + ":");
-      console.info(JSON.stringify(decoded, null, 2));
-    } catch(e) {
-      console.error("Failed to decode #" + (i + 1) + ":");
-      console.error(e);
-    }
-  }));
-} else if ('verify' === opts.action || (!opts.action && opts.jwts.length)) {
-  if (!opts.jwts.length) {
-    console.error("no JWTs specified to verify");
-    process.exit(1);
-    return;
-  }
-
-  return Promise.all(opts.jwts.map(function (jwt, i) {
-    return require('keyfetch').verify({ jwt: jwt }).then(function (decoded) {
-      console.info("Verified #" + (i + 1) + ":");
-      console.info(JSON.stringify(decoded, null, 2));
-    }).catch(function (err) {
-      console.error("Failed to verify #" + (i + 1) + ":");
+var cmd = "npm install --global keypairs-cli";
+console.error(cmd);
+require('child_process').exec(cmd, function (err) {
+  if (err) {
     console.error(err);
-    });
-  }));
-} else {
-  if (opts.names.length > 3) {
-    console.error("there should only be one input file and up to two output files when converting keypairs");
-    console.error(opts.names.map(function (t) { return t.name; }));
-    process.exit(1);
     return;
   }
-  kp = Promise.resolve(readKeypair());
-}
-
-if ('sign' === opts.action) {
-  return kp.then(function (pair) {
-    var jwk = pair.private;
-    if (!jwk || !jwk.d) {
-      console.error("the first key was not a private key");
-      console.error(opts.names.map(function (t) { return t.name; }));
-      process.exit(1);
-      return;
-    }
-    if (!opts.payloads.length) {
-      opts.payloads.push('{}');
-    }
-    return Promise.all(opts.payloads.map(function (payload) {
-      var claims = JSON.parse(payload);
-      if (!claims.iss) { claims.iss = opts.issuer; }
-      if (!claims.iss) { console.warn("No issuer given, token will not be verifiable"); }
-      if (!claims.sub) { claims.sub = opts.sub; }
-      if (!claims.exp) {
-        if (!opts.expiresAt) { setTimes('15m'); }
-        claims.exp = opts.expiresAt;
-      }
-      if (!claims.iat) { claims.iat = opts.issuedAt; }
-      if (!claims.nbf) { claims.nbf = opts.nbf; }
-      return Keypairs.signJwt({ jwk: pair.private, claims: claims }).then(function (jwt) {
-        console.info(jwt);
+  console.info("Run 'keypairs help' to see what you can do!");
 });
-    }));
-  });
-} else {
-  return convertKeypair();
-}
-
-function readKeypair() {
-  // note that the jwk may be a string
-  var jwkopts = opts.jwks.shift();
-  var jwk = jwkopts && jwkopts.jwk;
-  if (!jwk) {
-    console.error("no keys could be parsed from the given arguments");
-    console.error(opts.names.map(function (t) { return t.name; }));
-    process.exit(1);
-    return;
-  }
-
-  // omit the primary private key from the list of actual (or soon-to-be) files
-  if (jwkopts.filename) {
-    opts.names = opts.names.filter(function (name) {
-      console.log(jwkopts.filename, name.name);
-      return name.name !== jwkopts.filename;
-    });
-  }
-
-  var pair = { private: null, public: null };
-  if (jwk.d) {
-    pair.private = jwk;
-  }
-  pair.public = Keypairs._neuter({ jwk: jwk });
-  return pair;
-}
-
-function convertKeypair() {
-  var pair = readKeypair();
-
-  var ps = [];
-  if (pair.private && !opts.public) {
-    if ((!opts.privEncoding || 'json' === opts.privEncoding) && (!opts.privFormat || 'jwk' === opts.privFormat)) {
-      ps.push(Promise.resolve(pair.private));
-    } else {
-      ps.push(Keypairs.export({ jwk: pair.private, format: opts.privFormat, encoding: opts.privEncoding }));
-    }
-  }
-  if (!opts.private) {
-    if (opts.public) {
-      if (!opts.pubFormat) { opts.pubFormat = opts.privFormat; }
-      if (!opts.pubEncoding) { opts.pubEncoding = opts.privEncoding; }
-    }
-
-    if ((!opts.pubEncoding || 'json' === opts.pubEncoding) && (!opts.pubFormat || 'jwk' === opts.pubFormat)) {
-      ps.push(Promise.resolve(pair.public));
-    } else {
-      ps.push(Keypairs.export({ jwk: pair.public, format: opts.pubFormat, encoding: opts.pubEncoding, public: true }));
-    }
-  }
-  return Promise.all(ps).then(function (arr) {
-    // only use the first key
-    var key = convert(0, opts.public);
-    if (opts.public) {
-      // end early
-      if (opts.names.length) {
-        writeFile(opts.names[0].name, key, !opts.public); // todo make pub/priv param consistent, not flip-flop
-      } else {
-      console.warn(key + "\n");
-      }
-      return;
-    }
-
-    // private key stuff
-    if (opts.names.length) {
-      writeFile(opts.names[0].name, key, true);
-    } else {
-      console.info(key + "\n");
-    }
-
-    // pub key stuff
-    if (!opts.private) {
-      if (opts.names.length >= 2) {
-        writeFile(opts.names[1].name, key, false);
-      } else {
-        console.warn(key + "\n");
-      }
-    }
-
-    return pair;
-
-    function convert(i, pub) {
-      if (arr[i].kty) {
-        if (pub) {
-          if (opts.expiresAt) { arr[i].exp = opts.expiresAt; }
-          arr[i].use = "sig";
-        }
-        arr[i] = JSON.stringify(arr[i]);
-      }
-      return arr[i];
-    }
-  });
-}
-
-function genKeypair() {
-  return Keypairs.generate({
-    kty: opts.kty
-  , modulusLength: opts.modulusLength
-  , namedCurve: opts.namedCurve
-  }).then(function (pair) {
-    var ps = [];
-    if ((!opts.privEncoding || 'json' === opts.privEncoding) && (!opts.privFormat || 'jwk' === opts.privFormat)) {
-      ps.push(Promise.resolve(pair.private));
-    } else {
-      ps.push(Keypairs.export({ jwk: pair.private, format: opts.privFormat, encoding: opts.privEncoding }));
-    }
-    if ((!opts.pubEncoding || 'json' === opts.pubEncoding) && (!opts.pubFormat || 'jwk' === opts.pubFormat)) {
-      ps.push(Promise.resolve(pair.public));
-    } else {
-      ps.push(Keypairs.export({ jwk: pair.public, format: opts.pubFormat, encoding: opts.pubEncoding, public: true }));
-    }
-    return Promise.all(ps).then(function (arr) {
-      if (arr[0].kty) {
-        arr[0] = JSON.stringify(arr[0]);
-      }
-      if (arr[1].kty) {
-        if (opts.expiresAt) { arr[1].exp = opts.expiresAt; }
-        arr[1].use = "sig";
-        arr[1] = JSON.stringify(arr[1]);
-      }
-      if (!opts.names.length) {
-        console.info(arr[0] + "\n");
-        console.warn(arr[1] + "\n");
-      }
-      if (opts.names.length >= 1) {
-        writeFile(opts.names[0].name, arr[0], true);
-        if (!opts.private && opts.names.length >= 2) {
-          writeFile(opts.names[1].name, arr[1]);
-        }
-      }
-
-      return pair;
-    });
-  });
-}
-
-function writeFile(name, key, priv) {
-  var overwrite;
-  try {
-    fs.accessSync(name);
-    overwrite = opts.overwrite;
-    if (!opts.overwrite) {
-      if (priv) {
-        console.info(key + "\n");
-      } else {
-        console.warn(key + "\n");
-      }
-      console.error("'" + name + "' exists! force overwrite with 'overwrite'");
-      process.exit(1);
-      return;
-    }
-  } catch(e) {
-    // the file does not exist (or cannot be accessed)
-  }
-  fs.writeFileSync(name, key);
-  if (overwrite) {
-    console.info("Overwrote " + (priv ? "private" : "public") + " key at '" + name + "'");
-  } else {
-    console.info("Wrote " + (priv ? "private" : "public") + " key to '" + name + "'");
-  }
-}
-
-function setJwt(arg) {
-  try {
-    var jwt = arg.match(/^([\w-]+)\.([\w-]+)\.([\w-]+)$/);
-    // make sure header is a JWT header
-    JSON.parse(Buffer.from(jwt[1], 'base64'));
-    opts.jwts.push(arg);
-    return true;
-  } catch(e) {
-    // ignore
-  }
-}
-
-function setSubject(arg) {
-  if (!/.+@[a-z0-9_-]+\.[a-z0-9_-]+/i.test(arg)) {
-    return false;
-  }
-
-  opts.subject = arg;
-  return false;
-}
-
-function setIssuer(arg) {
-  if (!/^https?:\/\/[a-z0-9_-]+\.[a-z0-9_-]+/i.test(arg)) {
-    return false;
-  }
-
-  try {
-    new URL(arg);
-    opts.issuer = arg.replace(/\/$/, '');
-    return true;
-  } catch(e) {
-  }
-  return false;
-}
-
-function setTimes(arg) {
-  var t = arg.match(/^(\-?\d+)([dhms])$/i);
-  if (!t || !t[0]) {
-    return false;
-  }
-
-  var num = parseInt(t[1], 10);
-  var unit = t[2];
-  var mult = 1;
-  opts.issuedAt = Math.round(Date.now()/1000);
-  switch(unit) {
-    // fancy fallthrough, what fun!
-    case 'd':
-      mult *= 24;
-      /*falls through*/
-    case 'h':
-      mult *= 60;
-      /*falls through*/
-    case 'm':
-      mult *= 60;
-      /*falls through*/
-    case 's':
-      mult *= 1;
-  }
-  if (!opts.expiresIn) {
-    opts.expiresIn = mult * num;
-    opts.expiresAt = opts.issuedAt + opts.expiresIn;
-  } else {
-    opts.nbf = opts.issuedAt + (mult * num);
-  }
-  return true;
-}
-
-function decodeJwt(jwt) {
-  var parts = jwt.split('.');
-  return {
-    header: JSON.parse(Buffer.from(parts[0], 'base64'))
-  , payload: JSON.parse(Buffer.from(parts[1], 'base64'))
-  , signature: parts[2] //Buffer.from(parts[2], 'base64')
-  };
-}

keypairs.js

@@ -10,10 +10,19 @@ var Keypairs = module.exports;
 Keypairs.generate = function (opts) {
   opts = opts || {};
   var kty = opts.kty || opts.type;
+  var p;
   if ('RSA' === kty) {
-    return Rasha.generate(opts);
+    p = Rasha.generate(opts);
+  } else {
+    p = Eckles.generate(opts);
   }
-  return Eckles.generate(opts);
+  return p.then(function (pair) {
+    return Keypairs.thumbprint({ jwk: pair.public }).then(function (thumb) {
+      pair.private.kid = thumb; // maybe not the same id on the private key?
+      pair.public.kid = thumb;
+      return pair;
+    });
+  });
 };
 
 Keypairs.parse = function (opts) {
@@ -24,6 +33,7 @@ Keypairs.parse = function (opts) {
   var pem;
   var p;
 
+  if (!opts.key || !opts.key.kty) {
     try {
       jwk = JSON.parse(opts.key);
       p = Keypairs.export({ jwk: jwk }).catch(function (e) {
@@ -41,6 +51,9 @@ Keypairs.parse = function (opts) {
         return Promise.reject(err);
       });
     }
+  } else {
+    p = Promise.resolve(opts.key);
+  }
 
   return p.then(function (jwk) {
     var pubopts = JSON.parse(JSON.stringify(opts));
@@ -74,6 +87,11 @@ Keypairs.parseOrGenerate = function (opts) {
 Keypairs.import = function (opts) {
   return Eckles.import(opts).catch(function () {
     return Rasha.import(opts);
+  }).then(function (jwk) {
+    return Keypairs.thumbprint({ jwk: jwk }).then(function (thumb) {
+      jwk.kid = thumb;
+      return jwk;
+    });
   });
 };
 
@@ -87,24 +105,32 @@ Keypairs.export = function (opts) {
   });
 };
 
-Keypairs._neuter = function (opts) {
+// Chopping off the private parts is now part of the public API.
+// I thought it sounded a little too crude at first, but it really is the best name in every possible way.
+Keypairs.neuter = Keypairs._neuter = function (opts) {
   // trying to find the best balance of an immutable copy with custom attributes
   var jwk = {};
   Object.keys(opts.jwk).forEach(function (k) {
+    if ('undefined' === typeof opts.jwk[k]) { return; }
     // ignore RSA and EC private parts
     if (-1 !== ['d', 'p', 'q', 'dp', 'dq', 'qi'].indexOf(k)) { return; }
     jwk[k] = JSON.parse(JSON.stringify(opts.jwk[k]));
   });
   return jwk;
 };
+
 Keypairs.publish = function (opts) {
   if ('object' !== typeof opts.jwk || !opts.jwk.kty) { throw new Error("invalid jwk: " + JSON.stringify(opts.jwk)); }
 
-  var jwk = Keypairs._neuter(opts);
+  // returns a copy
+  var jwk = Keypairs.neuter(opts);
 
-  if (!jwk.exp) {
-    if (opts.expiresIn) { jwk.exp = Math.round(Date.now()/1000) + opts.expiresIn; }
-    else { jwk.exp = opts.expiresAt; }
+  if (jwk.exp) {
+    jwk.exp = setTime(jwk.exp);
+  } else {
+    if (opts.exp) { jwk.exp = setTime(opts.exp); }
+    else if (opts.expiresIn) { jwk.exp = Math.round(Date.now()/1000) + opts.expiresIn; }
+    else if (opts.expiresAt) { jwk.exp = opts.expiresAt; }
   }
   if (!jwk.use && false !== jwk.use) { jwk.use = "sig"; }
 
@@ -128,20 +154,25 @@ Keypairs.signJwt = function (opts) {
     var header = opts.header || {};
     var claims = JSON.parse(JSON.stringify(opts.claims || {}));
     header.typ = 'JWT';
-    if (!header.kid) {
-      header.kid = thumb;
-    }
-    if (false === claims.iat) {
+
+    if (!header.kid) { header.kid = thumb; }
+    if (!header.alg && opts.alg) { header.alg = opts.alg; }
+    if (!claims.iat && (false === claims.iat || false === opts.iat)) {
       claims.iat = undefined;
     } else if (!claims.iat) {
       claims.iat = Math.round(Date.now()/1000);
     }
-    if (false === claims.exp) {
+
+    if (opts.exp) {
+      claims.exp = setTime(opts.exp);
+    } else if (!claims.exp && (false === claims.exp || false === opts.exp)) {
       claims.exp = undefined;
     } else if (!claims.exp) {
-      throw new Error("opts.claims.exp should be the expiration date (as seconds since the Unix epoch) or false");
+      throw new Error("opts.claims.exp should be the expiration date as seconds, human form (i.e. '1h' or '15m') or false");
     }
-    if (false === claims.iss) {
+
+    if (opts.iss) { claims.iss = opts.iss; }
+    if (!claims.iss && (false === claims.iss || false === opts.iss)) {
       claims.iss = undefined;
     } else if (!claims.iss) {
       throw new Error("opts.claims.iss should be in the form of https://example.com/, a secure OIDC base url");
@@ -166,7 +197,7 @@ Keypairs.signJws = function (opts) {
       if (!opts.jwk) {
         throw new Error("opts.jwk must exist and must declare 'typ'");
       }
-      return ('RSA' === opts.jwk.typ) ? "RS256" : "ES256";
+      return ('RSA' === opts.jwk.kty) ? "RS256" : "ES256";
     }
 
     function sign(pem) {
@@ -198,13 +229,21 @@ Keypairs.signJws = function (opts) {
       }
 
       // node specifies RSA-SHAxxx even whet it's actually ecdsa (it's all encoded x509 shasums anyway)
-      var nodeAlg = "RSA-SHA" + (((protect||header).alg||'').replace(/^[^\d]+/, '')||'256');
+      var nodeAlg = "SHA" + (((protect||header).alg||'').replace(/^[^\d]+/, '')||'256');
       var protected64 = Enc.strToUrlBase64(protectedHeader);
       var payload64 = Enc.bufToUrlBase64(payload);
-      var sig = require('crypto')
+      var binsig = require('crypto')
         .createSign(nodeAlg)
         .update(protect ? (protected64 + "." + payload64) : payload64)
-        .sign(pem, 'base64')
+        .sign(pem)
+      ;
+      if ('EC' === opts.jwk.kty) {
+        // ECDSA JWT signatures differ from "normal" ECDSA signatures
+        // https://tools.ietf.org/html/rfc7518#section-3.4
+        binsig = ecdsaAsn1SigToJoseSig(binsig);
+      }
+
+      var sig = binsig.toString('base64')
         .replace(/\+/g, '-')
         .replace(/\//g, '_')
         .replace(/=/g, '')
@@ -218,6 +257,41 @@ Keypairs.signJws = function (opts) {
       };
     }
 
+    function ecdsaAsn1SigToJoseSig(binsig) {
+      // should have asn1 sequence header of 0x30
+      if (0x30 !== binsig[0]) { throw new Error("Impossible EC SHA head marker"); }
+      var index = 2; // first ecdsa "R" header byte
+      var len = binsig[1];
+      var lenlen = 0;
+      // Seek length of length if length is greater than 127 (i.e. two 512-bit / 64-byte R and S values)
+      if (0x80 & len) {
+        lenlen = len - 0x80; // should be exactly 1
+        len = binsig[2]; // should be <= 130 (two 64-bit SHA-512s, plus padding)
+        index += lenlen;
+      }
+      // should be of BigInt type
+      if (0x02 !== binsig[index]) { throw new Error("Impossible EC SHA R marker"); }
+      index += 1;
+
+      var rlen = binsig[index];
+      var bits = 32;
+      if (rlen > 49) {
+        bits = 64;
+      } else if (rlen > 33) {
+        bits = 48;
+      }
+      var r = binsig.slice(index + 1, index + 1 + rlen).toString('hex');
+      var slen = binsig[index + 1 + rlen + 1]; // skip header and read length
+      var s = binsig.slice(index + 1 + rlen + 1 + 1).toString('hex');
+      if (2 *slen !== s.length) { throw new Error("Impossible EC SHA S length"); }
+      // There may be one byte of padding on either
+      while (r.length < 2*bits) { r = '00' + r; }
+      while (s.length < 2*bits) { s = '00' + s; }
+      if (2*(bits+1) === r.length) { r = r.slice(2); }
+      if (2*(bits+1) === s.length) { s = s.slice(2); }
+      return Buffer.concat([Buffer.from(r, 'hex'), Buffer.from(s, 'hex')]);
+    }
+
     if (opts.pem && opts.jwk) {
       return sign(opts.pem);
     } else {
@@ -226,6 +300,36 @@ Keypairs.signJws = function (opts) {
   });
 };
 
+function setTime(time) {
+  if ('number' === typeof time) { return time; }
+
+  var t = time.match(/^(\-?\d+)([dhms])$/i);
+  if (!t || !t[0]) {
+    throw new Error("'" + time + "' should be datetime in seconds or human-readable format (i.e. 3d, 1h, 15m, 30s");
+  }
+
+  var now = Math.round(Date.now()/1000);
+  var num = parseInt(t[1], 10);
+  var unit = t[2];
+  var mult = 1;
+  switch(unit) {
+    // fancy fallthrough, what fun!
+    case 'd':
+      mult *= 24;
+      /*falls through*/
+    case 'h':
+      mult *= 60;
+      /*falls through*/
+    case 'm':
+      mult *= 60;
+      /*falls through*/
+    case 's':
+      mult *= 1;
+  }
+
+  return now + (mult * num);
+}
+
 Enc.strToUrlBase64 = function (str) {
   // node automatically can tell the difference
   // between uc2 (utf-8) strings and binary strings
@@ -238,3 +342,25 @@ Enc.bufToUrlBase64 = function (buf) {
   return Buffer.from(buf).toString('base64')
     .replace(/\+/g, '-').replace(/\//g, '_').replace(/=/g, '');
 };
+
+// For 'rsa-compat' module only
+// PLEASE do not use these sync methods, they are deprecated
+Keypairs._importSync = function (opts) {
+  try {
+    return Eckles.importSync(opts);
+  } catch(e) {
+    try {
+      return Rasha.importSync(opts);
+    } catch(e) {
+      console.error("options.pem does not appear to be a valid RSA or ECDSA public or private key");
+    }
+  }
+};
+// PLEASE do not use these, they are deprecated
+Keypairs._exportSync = function (opts) {
+  if ('RSA' === opts.jwk.kty) {
+    return Rasha.exportSync(opts);
+  } else {
+    return Eckles.exportSync(opts);
+  }
+};

package.json

@@ -1,17 +1,16 @@
 {
   "name": "keypairs",
-  "version": "1.2.0",
-  "description": "Lightweight RSA/ECDSA keypair generation and JWK <-> PEM",
+  "version": "1.2.14",
+  "description": "Lightweight RSA/ECDSA keypair generation and JWK <-> PEM using node's native RSA and ECDSA support",
   "main": "keypairs.js",
   "files": [
-    "CLI.md",
     "bin/keypairs.js"
   ],
   "scripts": {
     "test": "node test.js"
   },
   "bin": {
-    "keypairs": "bin/keypairs.js"
+    "keypairs-install": "bin/keypairs.js"
   },
   "repository": {
     "type": "git",
@@ -22,7 +21,11 @@
     "RSA",
     "ECDSA",
     "PEM",
-    "JWK"
+    "JWK",
+    "keypair",
+    "crypto",
+    "sign",
+    "verify"
   ],
   "author": "AJ ONeal <coolaj86@gmail.com> (https://coolaj86.com/)",
   "license": "MPL-2.0",

test.js

@@ -1,6 +1,7 @@
 var Keypairs = require('./');
 
 /* global Promise*/
+console.info("This SHOULD result in an error message:");
 Keypairs.parseOrGenerate({ key: '' }).then(function (pair) {
   // should NOT have any warning output
   if (!pair.private || !pair.public) {
@@ -90,6 +91,20 @@ Keypairs.parseOrGenerate({ key: '' }).then(function (pair) {
       if ('NOERR' === e.code) { throw e; }
       return true;
     })
+  , Keypairs.signJwt({ jwk: pair.private, alg: 'ES512', iss: 'https://example.com/', exp: '1h' }).then(function (jwt) {
+      var parts = jwt.split('.');
+      var now = Math.round(Date.now()/1000);
+      var token = {
+        header: JSON.parse(Buffer.from(parts[0], 'base64'))
+      , payload: JSON.parse(Buffer.from(parts[1], 'base64'))
+      , signature: parts[2] //Buffer.from(parts[2], 'base64')
+      };
+      // allow some leeway just in case we happen to hit a 1ms boundary
+      if (token.payload.exp - now > 60 * 59.99) {
+        return true;
+      }
+      throw new Error("token was not properly generated");
+    })
   ]).then(function (results) {
     if (results.length && results.every(function (v) { return true === v; })) {
       console.info("If a warning prints right above this, it's a pass");