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fix(ecdh): allow base64 to be left-0-padded, needed for JWK format

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Fixes #97
This commit is contained in:
Jack Kleeman 2017-04-11 10:14:00 +01:00 committed by Friedel Ziegelmayer
parent 2b0b7abd78
commit be64372a5e
3 changed files with 11 additions and 4 deletions
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4
src/crypto/ecdh-browser.js
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@ -117,8 +117,8 @@ function unmarshalPublicKey (curve, key) {
return {
kty: 'EC',
crv: curve,
x: toBase64(x),
y: toBase64(y),
x: toBase64(x, byteLen),
y: toBase64(y, byteLen),
ext: true
}
}

5
src/crypto/util.js
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@ -5,8 +5,9 @@ const Buffer = require('safe-buffer').Buffer
// Convert a BN.js instance to a base64 encoded string without padding
// Adapted from https://tools.ietf.org/html/draft-ietf-jose-json-web-signature-41#appendix-C
exports.toBase64 = function toBase64 (bn) {
let s = bn.toArrayLike(Buffer, 'be').toString('base64')
exports.toBase64 = function toBase64 (bn, len) {
// if len is defined then the bytes are leading-0 padded to the length
let s = bn.toArrayLike(Buffer, 'be', len).toString('base64')
return s
.replace(/(=*)$/, '') // Remove any trailing '='s

6
test/util.spec.js
View File

@ -22,4 +22,10 @@ describe('Util', () => {
expect(util.toBase64(bn)).to.be.eql('3q0')
done()
})
it('toBase64 zero padding', (done) => {
let bnpad = new BN('ff', 16)
expect(util.toBase64(bnpad, 2)).to.be.eql('AP8')
done()
})
})