Import keystore logic from light-client

cryptostore/docs.go

@@ -0,0 +1,25 @@
+/*
+package cryptostore maintains everything needed for doing public-key signing and
+key management in software, based on the go-crypto library from tendermint.
+
+It is flexible, and allows the user to provide a key generation algorithm
+(currently Ed25519 or Secp256k1), an encoder to passphrase-encrypt our keys
+when storing them (currently SecretBox from NaCl), and a method to persist
+the keys (currently FileStorage like ssh, or MemStorage for tests).
+It should be relatively simple to write your own implementation of these
+interfaces to match your specific security requirements.
+
+Note that the private keys are never exposed outside the package, and the
+interface of Manager could be implemented by an HSM in the future for
+enhanced security.  It would require a completely different implementation
+however.
+
+This Manager aims to implement Signer and KeyManager interfaces, along
+with some extensions to allow importing/exporting keys and updating the
+passphrase.
+
+Encoder and Generator implementations are currently in this package,
+keys.Storage implementations exist as subpackages of
+keys/storage
+*/
+package cryptostore