56 lines
1.6 KiB
JavaScript
56 lines
1.6 KiB
JavaScript
'use strict';
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var SSH = module.exports;
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var Enc = require('./encoding.js');
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// 19 e c d s a - s h a 2 - n i s t p 2 5 6
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var SSH_EC_P256 = '00000013 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 32 35 36'
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.replace(/\s+/g, '').toLowerCase();
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// 19 e c d s a - s h a 2 - n i s t p 3 8 4
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var SSH_EC_P384 = '00000013 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 33 38 34'
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.replace(/\s+/g, '').toLowerCase();
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SSH.parseSsh = function (pem) {
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var jwk = { kty: 'EC', crv: null, x: null, y: null };
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var b64 = pem.split(/\s+/g)[1];
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var buf = Buffer.from(b64, 'base64');
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var hex = Enc.bufToHex(buf);
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var index = 40;
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var len;
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if (0 === hex.indexOf(SSH_EC_P256)) {
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jwk.crv = 'P-256';
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len = 32;
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} else if (0 === hex.indexOf(SSH_EC_P384)) {
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jwk.crv = 'P-384';
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len = 48;
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}
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var x = buf.slice(index, index + len);
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var y = buf.slice(index + len, index + len + len);
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jwk.x = Enc.bufToUrlBase64(x);
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jwk.y = Enc.bufToUrlBase64(y);
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return jwk;
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};
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SSH.packSsh = function (jwk) {
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// Custom SSH format
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var typ = 'ecdsa-sha2-nistp256';
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var a = '32 35 36';
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var b = '41';
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var comment = jwk.crv + '@localhost';
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if ('P-256' !== jwk.crv) {
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typ = 'ecdsa-sha2-nistp384';
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a = '33 38 34';
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b = '61';
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}
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var x = Enc.base64ToHex(jwk.x);
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var y = Enc.base64ToHex(jwk.y);
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var ssh = Enc.hexToUint8(
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('00 00 00 13 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70'
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+ a + '00 00 00 08 6e 69 73 74 70' + a + '00 00 00' + b
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+ '04' + x + y).replace(/\s+/g, '').toLowerCase()
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);
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return typ + ' ' + Enc.bufToBase64(ssh) + ' ' + comment;
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};
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