2 files changed, 62 insertions, 3 deletions
diff --git a/static/decrypt-aes-gcm.go b/static/decrypt-aes-gcm.go
new file mode 100644
index 0000000..bab07b5
--- /dev/null
+++ b/static/decrypt-aes-gcm.go
@@ -0,0 +1,52 @@
+package main
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"encoding/hex"
+	"errors"
+	"io/ioutil"
+	"os"
+)
+
+func main() {
+	err := inner()
+	if err != nil {
+		panic(err.Error())
+	}
+}
+
+func inner() error {
+	if len(os.Args) < 3 {
+		return errors.New("usage: ./decrypt-aes-gcm <key> <nonce> < input-file > output-file")
+	}
+	key, err := hex.DecodeString(os.Args[1])
+	if err != nil {
+		return err
+	}
+	nonce, err := hex.DecodeString(os.Args[2])
+	if err != nil {
+		return err
+	}
+	ciphertext, err := ioutil.ReadAll(os.Stdin)
+	if err != nil {
+		return err
+	}
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return err
+	}
+	aesgcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return err
+	}
+	plaintext, err := aesgcm.Open(nil, nonce, ciphertext, nil)
+	if err != nil {
+		return err
+	}
+	_, err = os.Stdout.Write(plaintext)
+	if err != nil {
+		return err
+	}
+	return nil
+}
diff --git a/static/styles.css b/static/styles.css
index 5ea8a95..768aba7 100644
--- a/static/styles.css
+++ b/static/styles.css
@@ -20,7 +20,7 @@ ul {
 }
 
 pre {
-	white-space: pre-wrap;
+	/* white-space: pre-wrap; */
 }
 
 details[open=""] {
@@ -51,6 +51,13 @@ code {
 	max-height: 200px;
     max-width: 300px;
 	min-height: 150px;
-    /* width: 48%; */
-    /* height: auto; */
+}
+
+.demo {
+    border: 1px dotted grey;
+    display: inline-block;
+    padding: 20px;
+	overflow-x: scroll;
+	width: 100%;
+	box-sizing: border-box;
 }