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var elliptic = require('elliptic');
var BN = require('bn.js');
module.exports = function createECDH(curve) {
return new ECDH(curve);
};
var aliases = {
secp256k1: {
name: 'secp256k1',
byteLength: 32
},
secp224r1: {
name: 'p224',
byteLength: 28
},
prime256v1: {
name: 'p256',
byteLength: 32
},
prime192v1: {
name: 'p192',
byteLength: 24
},
ed25519: {
name: 'ed25519',
byteLength: 32
},
secp384r1: {
name: 'p384',
byteLength: 48
},
secp521r1: {
name: 'p521',
byteLength: 66
}
};
aliases.p224 = aliases.secp224r1;
aliases.p256 = aliases.secp256r1 = aliases.prime256v1;
aliases.p192 = aliases.secp192r1 = aliases.prime192v1;
aliases.p384 = aliases.secp384r1;
aliases.p521 = aliases.secp521r1;
function ECDH(curve) {
this.curveType = aliases[curve];
if (!this.curveType ) {
this.curveType = {
name: curve
};
}
this.curve = new elliptic.ec(this.curveType.name);
this.keys = void 0;
}
ECDH.prototype.generateKeys = function (enc, format) {
this.keys = this.curve.genKeyPair();
return this.getPublicKey(enc, format);
};
ECDH.prototype.computeSecret = function (other, inenc, enc) {
inenc = inenc || 'utf8';
if (!Buffer.isBuffer(other)) {
other = new Buffer(other, inenc);
}
var otherPub = this.curve.keyFromPublic(other).getPublic();
var out = otherPub.mul(this.keys.getPrivate()).getX();
return formatReturnValue(out, enc, this.curveType.byteLength);
};
ECDH.prototype.getPublicKey = function (enc, format) {
var key = this.keys.getPublic(format === 'compressed', true);
if (format === 'hybrid') {
if (key[key.length - 1] % 2) {
key[0] = 7;
} else {
key [0] = 6;
}
}
return formatReturnValue(key, enc);
};
ECDH.prototype.getPrivateKey = function (enc) {
return formatReturnValue(this.keys.getPrivate(), enc);
};
ECDH.prototype.setPublicKey = function (pub, enc) {
enc = enc || 'utf8';
if (!Buffer.isBuffer(pub)) {
pub = new Buffer(pub, enc);
}
this.keys._importPublic(pub);
return this;
};
ECDH.prototype.setPrivateKey = function (priv, enc) {
enc = enc || 'utf8';
if (!Buffer.isBuffer(priv)) {
priv = new Buffer(priv, enc);
}
var _priv = new BN(priv);
_priv = _priv.toString(16);
this.keys._importPrivate(_priv);
return this;
};
function formatReturnValue(bn, enc, len) {
if (!Array.isArray(bn)) {
bn = bn.toArray();
}
var buf = new Buffer(bn);
if (len && buf.length < len) {
var zeros = new Buffer(len - buf.length);
zeros.fill(0);
buf = Buffer.concat([zeros, buf]);
}
if (!enc) {
return buf;
} else {
return buf.toString(enc);
}
}
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