git ssb

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'use strict'
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var cl     = require('chloride')
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exports.hash = function (data, enc) {
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  data = (
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    'string' === typeof data && enc == null
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  ? new Buffer(data, 'binary')
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  : new Buffer(data, enc)
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  )
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  return cl.crypto_hash_sha256(data).toString('base64')+'.sha256'
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}
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exports.hasSigil = function hasSigil (s) {
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  return /^(@|%|&)/.test(s)
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}
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function tag (key, tag) {
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  if(!tag) throw new Error('no tag for:' + key.toString('base64'))
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  return key.toString('base64')+'.' + tag.replace(/^\./, '')
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}
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exports.keysToJSON = function keysToJSON(keys, curve) {
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  curve = (keys.curve || curve)
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  var pub = tag(keys.public.toString('base64'), curve)
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  return {
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    curve: curve,
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    public: pub,
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    private: keys.private ? tag(keys.private.toString('base64'), curve) : undefined,
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    id: '@'+(curve === 'ed25519' ? pub : exports.hash(pub))
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  }
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}
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exports.getTag = function getTag (string) {
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  var i = string.indexOf('.')
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  return string.substring(i+1)
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}
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exports.toBuffer = function (buf) {
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  if(buf == null) return buf
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  if(Buffer.isBuffer(buf)) throw new Error('already a buffer')
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  var i = buf.indexOf('.')
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  var start = (exports.hasSigil(buf)) ? 1 : 0
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  return new Buffer(buf.substring(start, ~i ? i : buf.length), 'base64')
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}
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