update name: convertIfEcdsa => ecdsaAsn1SigToJoseSig

keypairs.js

@@ -154,9 +154,9 @@ 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 (!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) {
@@ -197,7 +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) {
@@ -229,13 +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, '')
@@ -249,6 +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 {
@@ -299,3 +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

@@ -1,7 +1,7 @@
 {
   "name": "keypairs",
-  "version": "1.2.8",
-  "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": [
     "bin/keypairs.js"
@@ -21,7 +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) {
@@ -90,7 +91,7 @@ Keypairs.parseOrGenerate({ key: '' }).then(function (pair) {
       if ('NOERR' === e.code) { throw e; }
       return true;
     })
-  , Keypairs.signJwt({ jwk: pair.private, iss: 'https://example.com/', exp: '1h' }).then(function (jwt) {
+  , 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 = {