Cleaned up remaining types for android bindings. Added bindings build…

… script

client.go

@@ -238,7 +238,7 @@ func (np *PubNameAndPassword) PubKey() (e4crypto.Ed25519PublicKey, error) {
 		return nil, fmt.Errorf("failed to create ed25519 key from password: %v", err)
 	}
 
-	edKey, ok := key.Public().(ed25519.PublicKey)
+	edKey, ok := ed25519.PrivateKey(key).Public().(ed25519.PublicKey)
 	if !ok {
 		return nil, errors.New("failed to cast key to ed25519.PublicKey")
 	}

crypto/crypto.go

@@ -97,7 +97,7 @@ func Decrypt(key, ad, ct []byte) ([]byte, error) {
 
 // Sign will sign the given payload using the given privateKey,
 // producing an output composed of: timestamp + signedID + payload + signature
-func Sign(signerID []byte, privateKey ed25519.PrivateKey, timestamp []byte, payload []byte) ([]byte, error) {
+func Sign(signerID []byte, privateKey Ed25519PrivateKey, timestamp []byte, payload []byte) ([]byte, error) {
 	if len(signerID) != IDLen {
 		return nil, ErrInvalidSignerID
 	}
@@ -206,7 +206,7 @@ func RandomDelta16() uint16 {
 }
 
 // Ed25519PrivateKeyFromPassword creates a ed25519.PrivateKey from a password
-func Ed25519PrivateKeyFromPassword(password string) (ed25519.PrivateKey, error) {
+func Ed25519PrivateKeyFromPassword(password string) (Ed25519PrivateKey, error) {
 	if err := ValidatePassword(password); err != nil {
 		return nil, fmt.Errorf("invalid password: %v", err)
 	}
@@ -215,8 +215,8 @@ func Ed25519PrivateKeyFromPassword(password string) (ed25519.PrivateKey, error)
 	return ed25519.NewKeyFromSeed(seed), nil
 }
 
-// PublicEd25519KeyToCurve25519 convert an ed25519.PublicKey to a curve25519 public key.
-func PublicEd25519KeyToCurve25519(edPubKey ed25519.PublicKey) Curve25519PublicKey {
+// PublicEd25519KeyToCurve25519 convert an Ed25519PublicKey to a Curve25519PublicKey.
+func PublicEd25519KeyToCurve25519(edPubKey Ed25519PublicKey) Curve25519PublicKey {
 	var edPk [ed25519.PublicKeySize]byte
 	var curveKey [Curve25519PubKeyLen]byte
 	copy(edPk[:], edPubKey)
@@ -227,8 +227,8 @@ func PublicEd25519KeyToCurve25519(edPubKey ed25519.PublicKey) Curve25519PublicKe
 	return curveKey[:]
 }
 
-// PrivateEd25519KeyToCurve25519 convert an ed25519.PrivateKey to a curve25519 private key.
-func PrivateEd25519KeyToCurve25519(edPrivKey ed25519.PrivateKey) Curve25519PrivateKey {
+// PrivateEd25519KeyToCurve25519 convert an Ed25519PrivateKey to a Curve25519PrivateKey.
+func PrivateEd25519KeyToCurve25519(edPrivKey Ed25519PrivateKey) Curve25519PrivateKey {
 	var edSk [ed25519.PrivateKeySize]byte
 	var curveKey [Curve25519PrivKeyLen]byte
 	copy(edSk[:], edPrivKey)

scripts/bindings.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+# Build android bindings
+# Require to have created env variables:
+#     export ANDROID_HOME=~/Android/Sdk/
+#     export ANDROID_NDK_HOME=~/Android/Sdk/ndk/21.0.6113669/
+# (this is default path where Android Studio is installing the SDK and NDK)
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+
+OUTDIR="${DIR}/../dist/bindings/android"
+# List of packages to include in the generated bindings. (ie: keys is not needed)
+INCLUDE_GO_PACKAGES=""
+
+mkdir -p "${OUTDIR}" 2>/dev/null
+
+gomobile bind -v -target android -o "${OUTDIR}/e4.aar" ${DIR}/../ ${DIR}/../crypto