124 lines
2.8 KiB
JavaScript
124 lines
2.8 KiB
JavaScript
'use strict';
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var Enc = require('./encoding.js');
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var x509 = module.exports;
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// 1.2.840.10045.3.1.7
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// prime256v1 (ANSI X9.62 named elliptic curve)
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var OBJ_ID_EC_256 = '06 08 2A8648CE3D030107'.replace(/\s+/g, '').toLowerCase();
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// 1.3.132.0.34
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// secp384r1 (SECG (Certicom) named elliptic curve)
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var OBJ_ID_EC_384 = '06 05 2B81040022'.replace(/\s+/g, '').toLowerCase();
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x509.parseSec1 = function parseEcOnlyPrivkey(u8, jwk) {
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var index = 7;
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var len = 32;
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var olen = OBJ_ID_EC_256.length/2;
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if ("P-384" === jwk.crv) {
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olen = OBJ_ID_EC_384.length/2;
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index = 8;
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len = 48;
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}
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if (len !== u8[index - 1]) {
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throw new Error("Unexpected bitlength " + len);
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}
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// private part is d
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var d = u8.slice(index, index + len);
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// compression bit index
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var ci = index + len + 2 + olen + 2 + 3;
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var c = u8[ci];
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var x, y;
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if (0x04 === c) {
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y = u8.slice(ci + 1 + len, ci + 1 + len + len);
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} else if (0x02 !== c) {
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throw new Error("not a supported EC private key");
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}
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x = u8.slice(ci + 1, ci + 1 + len);
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return {
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kty: jwk.kty
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, crv: jwk.crv
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, d: Enc.bufToUrlBase64(d)
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//, dh: Enc.bufToHex(d)
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, x: Enc.bufToUrlBase64(x)
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//, xh: Enc.bufToHex(x)
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, y: Enc.bufToUrlBase64(y)
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//, yh: Enc.bufToHex(y)
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};
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};
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x509.parsePkcs8 = function parseEcPkcs8(u8, jwk) {
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console.log("here", u8);
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var index = 24 + (OBJ_ID_EC_256.length/2);
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var len = 32;
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/*
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if ("P-384" === jwk.crv) {
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index = 24 + (OBJ_ID_EC_384.length/2) + 2;
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len = 48;
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}
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*/
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//console.log(index, u8.slice(index));
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if (0x04 !== u8[index]) {
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//console.log(jwk);
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throw new Error("privkey not found");
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}
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var d = u8.slice(index+2, index+2+len);
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var ci = index+2+len+5;
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var xi = ci+1;
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var x = u8.slice(xi, xi + len);
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var yi = xi+len;
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var y;
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if (0x04 === u8[ci]) {
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y = u8.slice(yi, yi + len);
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} else if (0x02 !== u8[ci]) {
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throw new Error("invalid compression bit (expected 0x04 or 0x02)");
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}
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var jwk = {};
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return {
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kty: jwk.kty
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, crv: jwk.crv
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, d: Enc.bufToUrlBase64(d)
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//, dh: Enc.bufToHex(d)
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, x: Enc.bufToUrlBase64(x)
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//, xh: Enc.bufToHex(x)
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, y: Enc.bufToUrlBase64(y)
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//, yh: Enc.bufToHex(y)
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};
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};
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x509.parseSpki = function parsePem(u8, jwk) {
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var ci = 16 + OBJ_ID_EC_256.length/2;
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var len = 32;
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if ("P-384" === jwk.crv) {
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ci = 16 + OBJ_ID_EC_384.length/2;
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len = 48;
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}
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var c = u8[ci];
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var xi = ci + 1;
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var x = u8.slice(xi, xi + len);
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var yi = xi + len;
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var y;
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if (0x04 === c) {
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y = u8.slice(yi, yi + len);
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} else if (0x02 !== c) {
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throw new Error("not a supported EC private key");
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}
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return {
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kty: jwk.kty
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, crv: jwk.crv
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, x: Enc.bufToUrlBase64(x)
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//, xh: Enc.bufToHex(x)
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, y: Enc.bufToUrlBase64(y)
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//, yh: Enc.bufToHex(y)
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};
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};
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x509.parsePkix = x509.parseSpki;
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