Initial encryption/decryption via ChaCha20-Poly1305

wrappers/keyDeriv.go

@@ -0,0 +1,19 @@
+package wrappers
+
+import (
+	"golang.org/x/crypto/argon2"
+	"golang.org/x/crypto/chacha20poly1305"
+)
+
+// parameters for Argon2
+const (
+	argonTime    = 1
+	argonMemory  = 64 * 1024
+	argonThreads = 4
+	argonKeyLen  = chacha20poly1305.KeySize
+)
+
+// DeriveKey derives an encryption key from a passphrase using Argon2.
+func deriveKey(passphrase []byte, salt []byte) []byte {
+	return argon2.IDKey(passphrase, salt, argonTime, argonMemory, argonThreads, argonKeyLen)
+}