git ssb

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var cl = require('chloride')
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//var rx = require('is-canonical-base64')(null, null, 32)
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exports.isUnboxKey = function (s) {
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  return s === Buffer.from(s, 'base64').toString('base64')
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//  return rx.test(s)
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}
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exports.id2Buffer = function (id) {
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  return Buffer.from(id.substring(1, id.indexOf('.')), 'base64')
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}
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exports.isBox2 = function (ctxt) {
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  //we can just do a fairly lax check here, don't check the content
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  //is canonical base64, because that check has already been done.
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  return 'string' == typeof ctxt && /\.box2$/.test(ctxt)
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}
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exports.isCurvePair = function (keys) {
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  return keys.public && keys.private
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}
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exports.ctxt2Buffer = function (ctxt) {
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  return exports.isBox2(ctxt) && Buffer.from(ctxt.substring(0, ctxt.indexOf('.')), 'base64')
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}
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function toBuffer(b) {
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  return Buffer.isBuffer(b) ? b : Buffer.from(b, 'base64')
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}
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exports.hmac = function (a, b) {
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  return cl.crypto_auth(toBuffer(a), toBuffer(b))
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}
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exports.getGroupMsgKey = function (previous, group) {
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  //or would it be better to use generic hash (with key?)
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  return exports.hmac(Buffer.concat([previous, exports.id2Buffer(group.id)]), Buffer.from(group.unbox, 'base64'))
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}
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exports.scalarmultKeys = function (a_key, recps) {
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  return recps.map(function (curve) {
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    return cl.crypto_scalarmult(
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      toBuffer(curve.private),
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      toBuffer(a_key)
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    )
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  })
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}
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