Add ascii armor support

armor.go

@@ -0,0 +1,39 @@
+package crypto
+
+import (
+	"bytes"
+	"io/ioutil"
+
+	. "github.com/tendermint/go-common"
+	"golang.org/x/crypto/openpgp/armor"
+)
+
+func EncodeArmor(blockType string, headers map[string]string, data []byte) string {
+	buf := new(bytes.Buffer)
+	w, err := armor.Encode(buf, blockType, headers)
+	if err != nil {
+		PanicSanity("Error encoding ascii armor: " + err.Error())
+	}
+	_, err = w.Write(data)
+	if err != nil {
+		PanicSanity("Error encoding ascii armor: " + err.Error())
+	}
+	err = w.Close()
+	if err != nil {
+		PanicSanity("Error encoding ascii armor: " + err.Error())
+	}
+	return string(buf.Bytes())
+}
+
+func DecodeArmor(armorStr string) (blockType string, headers map[string]string, data []byte, err error) {
+	buf := bytes.NewBufferString(armorStr)
+	block, err := armor.Decode(buf)
+	if err != nil {
+		return "", nil, nil, err
+	}
+	data, err = ioutil.ReadAll(block.Body)
+	if err != nil {
+		return "", nil, nil, err
+	}
+	return block.Type, block.Header, data, nil
+}

armor_test.go

@@ -0,0 +1,25 @@
+package crypto
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestSimpleArmor(t *testing.T) {
+	blockType := "MINT TEST"
+	data := []byte("somedata")
+	armorStr := EncodeArmor(blockType, nil, data)
+	t.Log("Got armor: ", armorStr)
+
+	// Decode armorStr and test for equivalence.
+	blockType2, _, data2, err := DecodeArmor(armorStr)
+	if err != nil {
+		t.Error(err)
+	}
+	if blockType != blockType2 {
+		t.Errorf("Expected block type %v but got %v", blockType, blockType2)
+	}
+	if !bytes.Equal(data, data2) {
+		t.Errorf("Expected data %X but got %X", data2, data)
+	}
+}