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73 lines
1.9 KiB
73 lines
1.9 KiB
// Copyright 2015 Joyent, Inc. |
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module.exports = { |
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read: read, |
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write: write |
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}; |
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var assert = require('assert-plus'); |
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var utils = require('../utils'); |
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var Key = require('../key'); |
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var PrivateKey = require('../private-key'); |
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var pem = require('./pem'); |
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var ssh = require('./ssh'); |
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var rfc4253 = require('./rfc4253'); |
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function read(buf, options) { |
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if (typeof (buf) === 'string') { |
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if (buf.trim().match(/^[-]+[ ]*BEGIN/)) |
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return (pem.read(buf, options)); |
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if (buf.match(/^\s*ssh-[a-z]/)) |
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return (ssh.read(buf, options)); |
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if (buf.match(/^\s*ecdsa-/)) |
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return (ssh.read(buf, options)); |
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buf = new Buffer(buf, 'binary'); |
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} else { |
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assert.buffer(buf); |
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if (findPEMHeader(buf)) |
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return (pem.read(buf, options)); |
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if (findSSHHeader(buf)) |
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return (ssh.read(buf, options)); |
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} |
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if (buf.readUInt32BE(0) < buf.length) |
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return (rfc4253.read(buf, options)); |
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throw (new Error('Failed to auto-detect format of key')); |
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} |
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function findSSHHeader(buf) { |
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var offset = 0; |
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while (offset < buf.length && |
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(buf[offset] === 32 || buf[offset] === 10 || buf[offset] === 9)) |
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++offset; |
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if (offset + 4 <= buf.length && |
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buf.slice(offset, offset + 4).toString('ascii') === 'ssh-') |
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return (true); |
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if (offset + 6 <= buf.length && |
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buf.slice(offset, offset + 6).toString('ascii') === 'ecdsa-') |
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return (true); |
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return (false); |
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} |
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function findPEMHeader(buf) { |
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var offset = 0; |
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while (offset < buf.length && |
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(buf[offset] === 32 || buf[offset] === 10)) |
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++offset; |
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if (buf[offset] !== 45) |
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return (false); |
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while (offset < buf.length && |
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(buf[offset] === 45)) |
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++offset; |
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while (offset < buf.length && |
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(buf[offset] === 32)) |
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++offset; |
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if (offset + 5 > buf.length || |
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buf.slice(offset, offset + 5).toString('ascii') !== 'BEGIN') |
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return (false); |
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return (true); |
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} |
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function write(key, options) { |
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throw (new Error('"auto" format cannot be used for writing')); |
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}
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