x509.js
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'use strict';
var x509 = module.exports;
var ASN1 = require('./asn1.js');
var Enc = require('./encoding.js');
x509.guess = function (der, asn1) {
// accepting der for compatability with other usages
var meta = { kty: 'RSA', format: 'pkcs1', public: true };
//meta.asn1 = ASN1.parse(u8);
if (asn1.children.every(function(el) {
return 0x02 === el.type;
})) {
if (2 === asn1.children.length) {
// rsa pkcs1 public
return meta;
} else if (asn1.children.length >= 9) {
// the standard allows for "otherPrimeInfos", hence at least 9
meta.public = false;
// rsa pkcs1 private
return meta;
} else {
throw new Error("not an RSA PKCS#1 public or private key (wrong number of ints)");
}
} else {
meta.format = 'pkcs8';
}
return meta;
};
x509.parsePkcs1 = function parseRsaPkcs1(buf, asn1, jwk) {
if (!asn1.children.every(function(el) {
return 0x02 === el.type;
})) {
throw new Error("not an RSA PKCS#1 public or private key (not all ints)");
}
if (2 === asn1.children.length) {
jwk.n = Enc.bufToUrlBase64(asn1.children[0].value);
jwk.e = Enc.bufToUrlBase64(asn1.children[1].value);
return jwk;
} else if (asn1.children.length >= 9) {
// the standard allows for "otherPrimeInfos", hence at least 9
jwk.n = Enc.bufToUrlBase64(asn1.children[1].value);
jwk.e = Enc.bufToUrlBase64(asn1.children[2].value);
jwk.d = Enc.bufToUrlBase64(asn1.children[3].value);
jwk.p = Enc.bufToUrlBase64(asn1.children[4].value);
jwk.q = Enc.bufToUrlBase64(asn1.children[5].value);
jwk.dp = Enc.bufToUrlBase64(asn1.children[6].value);
jwk.dq = Enc.bufToUrlBase64(asn1.children[7].value);
jwk.qi = Enc.bufToUrlBase64(asn1.children[8].value);
return jwk;
} else {
throw new Error("not an RSA PKCS#1 public or private key (wrong number of ints)");
}
};
x509.parsePkcs8 = function parseRsaPkcs8(buf, asn1, jwk) {
if (2 === asn1.children.length
&& 0x03 === asn1.children[1].type
&& 0x30 === asn1.children[1].value[0]) {
asn1 = ASN1.parse(asn1.children[1].value);
jwk.n = Enc.bufToUrlBase64(asn1.children[0].value);
jwk.e = Enc.bufToUrlBase64(asn1.children[1].value);
} else if (3 === asn1.children.length
&& 0x04 === asn1.children[2].type
&& 0x30 === asn1.children[2].children[0].type
&& 0x02 === asn1.children[2].children[0].children[0].type) {
asn1 = asn1.children[2].children[0];
jwk.n = Enc.bufToUrlBase64(asn1.children[1].value);
jwk.e = Enc.bufToUrlBase64(asn1.children[2].value);
jwk.d = Enc.bufToUrlBase64(asn1.children[3].value);
jwk.p = Enc.bufToUrlBase64(asn1.children[4].value);
jwk.q = Enc.bufToUrlBase64(asn1.children[5].value);
jwk.dp = Enc.bufToUrlBase64(asn1.children[6].value);
jwk.dq = Enc.bufToUrlBase64(asn1.children[7].value);
jwk.qi = Enc.bufToUrlBase64(asn1.children[8].value);
} else {
throw new Error("not an RSA PKCS#8 public or private key (wrong format)");
}
return jwk;
};
x509.packPkcs1 = function (jwk) {
var n = ASN1.UInt(Enc.base64ToHex(jwk.n));
var e = ASN1.UInt(Enc.base64ToHex(jwk.e));
if (!jwk.d) {
return Enc.hexToBuf(ASN1('30', n, e));
}
return Enc.hexToBuf(ASN1('30'
, ASN1.UInt('00')
, n
, e
, ASN1.UInt(Enc.base64ToHex(jwk.d))
, ASN1.UInt(Enc.base64ToHex(jwk.p))
, ASN1.UInt(Enc.base64ToHex(jwk.q))
, ASN1.UInt(Enc.base64ToHex(jwk.dp))
, ASN1.UInt(Enc.base64ToHex(jwk.dq))
, ASN1.UInt(Enc.base64ToHex(jwk.qi))
));
};
x509.packPkcs8 = function (jwk) {
if (!jwk.d) {
// Public RSA
return Enc.hexToBuf(ASN1('30'
, ASN1('30'
, ASN1('06', '2a864886f70d010101')
, ASN1('05')
)
, ASN1.BitStr(ASN1('30'
, ASN1.UInt(Enc.base64ToHex(jwk.n))
, ASN1.UInt(Enc.base64ToHex(jwk.e))
))
));
}
// Private RSA
return Enc.hexToBuf(ASN1('30'
, ASN1.UInt('00')
, ASN1('30'
, ASN1('06', '2a864886f70d010101')
, ASN1('05')
)
, ASN1('04'
, ASN1('30'
, ASN1.UInt('00')
, ASN1.UInt(Enc.base64ToHex(jwk.n))
, ASN1.UInt(Enc.base64ToHex(jwk.e))
, ASN1.UInt(Enc.base64ToHex(jwk.d))
, ASN1.UInt(Enc.base64ToHex(jwk.p))
, ASN1.UInt(Enc.base64ToHex(jwk.q))
, ASN1.UInt(Enc.base64ToHex(jwk.dp))
, ASN1.UInt(Enc.base64ToHex(jwk.dq))
, ASN1.UInt(Enc.base64ToHex(jwk.qi))
)
)
));
};
x509.packSpki = x509.packPkcs8;