diff --git a/lib/x509.js b/lib/x509.js new file mode 100644 index 0000000..63d1a7d --- /dev/null +++ b/lib/x509.js @@ -0,0 +1,173 @@ +'use strict'; +(function (exports) { + 'use strict'; + var x509 = exports.x509 = {}; + var ASN1 = exports.ASN1; + var Enc = exports.Enc; + + // 1.2.840.10045.3.1.7 + // prime256v1 (ANSI X9.62 named elliptic curve) + var OBJ_ID_EC = '06 08 2A8648CE3D030107'.replace(/\s+/g, '').toLowerCase(); + // 1.3.132.0.34 + // secp384r1 (SECG (Certicom) named elliptic curve) + var OBJ_ID_EC_384 = '06 05 2B81040022'.replace(/\s+/g, '').toLowerCase(); + // 1.2.840.10045.2.1 + // ecPublicKey (ANSI X9.62 public key type) + var OBJ_ID_EC_PUB = '06 07 2A8648CE3D0201'.replace(/\s+/g, '').toLowerCase(); + + x509.parseSec1 = function parseEcOnlyPrivkey(u8, jwk) { + var index = 7; + var len = 32; + var olen = OBJ_ID_EC.length / 2; + + if ("P-384" === jwk.crv) { + olen = OBJ_ID_EC_384.length / 2; + index = 8; + len = 48; + } + if (len !== u8[index - 1]) { + throw new Error("Unexpected bitlength " + len); + } + + // private part is d + var d = u8.slice(index, index + len); + // compression bit index + var ci = index + len + 2 + olen + 2 + 3; + var c = u8[ci]; + var x, y; + + if (0x04 === c) { + y = u8.slice(ci + 1 + len, ci + 1 + len + len); + } else if (0x02 !== c) { + throw new Error("not a supported EC private key"); + } + x = u8.slice(ci + 1, ci + 1 + len); + + return { + kty: jwk.kty + , crv: jwk.crv + , d: Enc.bufToUrlBase64(d) + //, dh: Enc.bufToHex(d) + , x: Enc.bufToUrlBase64(x) + //, xh: Enc.bufToHex(x) + , y: Enc.bufToUrlBase64(y) + //, yh: Enc.bufToHex(y) + }; + }; + + x509.parsePkcs8 = function parseEcPkcs8(u8, jwk) { + var index = 24 + (OBJ_ID_EC.length / 2); + var len = 32; + if ("P-384" === jwk.crv) { + index = 24 + (OBJ_ID_EC_384.length / 2) + 2; + len = 48; + } + + //console.log(index, u8.slice(index)); + if (0x04 !== u8[index]) { + //console.log(jwk); + throw new Error("privkey not found"); + } + var d = u8.slice(index + 2, index + 2 + len); + var ci = index + 2 + len + 5; + var xi = ci + 1; + var x = u8.slice(xi, xi + len); + var yi = xi + len; + var y; + if (0x04 === u8[ci]) { + y = u8.slice(yi, yi + len); + } else if (0x02 !== u8[ci]) { + throw new Error("invalid compression bit (expected 0x04 or 0x02)"); + } + + return { + kty: jwk.kty + , crv: jwk.crv + , d: Enc.bufToUrlBase64(d) + //, dh: Enc.bufToHex(d) + , x: Enc.bufToUrlBase64(x) + //, xh: Enc.bufToHex(x) + , y: Enc.bufToUrlBase64(y) + //, yh: Enc.bufToHex(y) + }; + }; + + x509.parseSpki = function parsePem(u8, jwk) { + var ci = 16 + OBJ_ID_EC.length / 2; + var len = 32; + + if ("P-384" === jwk.crv) { + ci = 16 + OBJ_ID_EC_384.length / 2; + len = 48; + } + + var c = u8[ci]; + var xi = ci + 1; + var x = u8.slice(xi, xi + len); + var yi = xi + len; + var y; + if (0x04 === c) { + y = u8.slice(yi, yi + len); + } else if (0x02 !== c) { + throw new Error("not a supported EC private key"); + } + + return { + kty: jwk.kty + , crv: jwk.crv + , x: Enc.bufToUrlBase64(x) + //, xh: Enc.bufToHex(x) + , y: Enc.bufToUrlBase64(y) + //, yh: Enc.bufToHex(y) + }; + }; + x509.parsePkix = x509.parseSpki; + + x509.packSec1 = function (jwk) { + var d = Enc.base64ToHex(jwk.d); + var x = Enc.base64ToHex(jwk.x); + var y = Enc.base64ToHex(jwk.y); + var objId = ('P-256' === jwk.crv) ? OBJ_ID_EC : OBJ_ID_EC_384; + return Enc.hexToUint8( + ASN1('30' + , ASN1.UInt('01') + , ASN1('04', d) + , ASN1('A0', objId) + , ASN1('A1', ASN1.BitStr('04' + x + y))) + ); + }; + x509.packPkcs8 = function (jwk) { + var d = Enc.base64ToHex(jwk.d); + var x = Enc.base64ToHex(jwk.x); + var y = Enc.base64ToHex(jwk.y); + var objId = ('P-256' === jwk.crv) ? OBJ_ID_EC : OBJ_ID_EC_384; + return Enc.hexToUint8( + ASN1('30' + , ASN1.UInt('00') + , ASN1('30' + , OBJ_ID_EC_PUB + , objId + ) + , ASN1('04' + , ASN1('30' + , ASN1.UInt('01') + , ASN1('04', d) + , ASN1('A1', ASN1.BitStr('04' + x + y))))) + ); + }; + x509.packSpki = function (jwk) { + var x = Enc.base64ToHex(jwk.x); + var y = Enc.base64ToHex(jwk.y); + var objId = ('P-256' === jwk.crv) ? OBJ_ID_EC : OBJ_ID_EC_384; + return Enc.hexToUint8( + ASN1('30' + , ASN1('30' + , OBJ_ID_EC_PUB + , objId + ) + , ASN1.BitStr('04' + x + y)) + ); + }; + x509.packPkix = x509.packSpki; + +}('undefined' !== typeof module ? module.exports : window));