init: pristine aerc 0.20.0 source

lib/crypto/gpg/gpgbin/sign.go

@@ -0,0 +1,29 @@
+package gpgbin
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+
+	"git.sr.ht/~rjarry/aerc/models"
+)
+
+// Sign creates a detached signature based on the contents of r
+func Sign(r io.Reader, from string) ([]byte, string, error) {
+	args := []string{
+		"--armor",
+		"--detach-sign",
+		"--default-key", from,
+	}
+
+	g := newGpg(r, args)
+	_ = g.cmd.Run()
+
+	var md models.MessageDetails
+	err := parseStatusFd(bytes.NewReader(g.stderr.Bytes()), &md)
+	if err != nil {
+		return nil, "", fmt.Errorf("failed to parse messagedetails: %w", err)
+	}
+
+	return g.stdout.Bytes(), md.Micalg, nil
+}