1 files changed, 50 insertions, 0 deletions
diff --git a/sign_input.go b/sign_input.go
new file mode 100644
index 0000000..e2c2320
--- /dev/null
+++ b/sign_input.go
@@ -0,0 +1,50 @@
+package main
+
+import (
+	"crypto"
+	"encoding/base64"
+	"flag"
+	"io"
+	"io/ioutil"
+)
+
+func SignInput(args []string) error {
+	fs := flag.NewFlagSet("pkictl sign-input", flag.ExitOnError)
+	flagPrivate := fs.String("private-key", "", "path to the private key or read from stdin")
+	flagInput := fs.String("input", "stdin", "path to the message to sign or stdin")
+	flagOutput := fs.String("output", "stdout", "write private key to file")
+	fs.Parse(args)
+
+	pk, err := loadPrivateKey(*flagPrivate)
+	if err != nil {
+		return err
+	}
+
+	out, err := openOutput(*flagOutput)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+
+	in, err := openInput(*flagInput)
+	if err != nil {
+		return err
+	}
+	defer in.Close()
+
+	message, err := ioutil.ReadAll(in)
+	if err != nil {
+		return err
+	}
+
+	signature, err := pk.Sign(message, crypto.SHA256)
+	if err != nil {
+		return err
+	}
+
+	_, err = io.WriteString(out, base64.StdEncoding.EncodeToString(signature))
+	if err != nil {
+		return err
+	}
+	return nil
+}