1 files changed, 118 insertions, 0 deletions
diff --git a/test/ii-128/test-ae-roundtrip.c b/test/ii-128/test-ae-roundtrip.c
new file mode 100644
index 0000000..80ac737
--- /dev/null
+++ b/test/ii-128/test-ae-roundtrip.c
@@ -0,0 +1,118 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "lilliput-ae.h"
+
+#include "test-helpers.h"
+
+
+struct vector
+{
+    char *name;
+    uint8_t key[KEY_BYTES];
+    uint8_t nonce[NONCE_BYTES];
+    size_t auth_len;
+    uint8_t *auth;
+    size_t message_len;
+    uint8_t *message;
+};
+
+typedef struct vector vector;
+
+
+/* Keys and nonces generated with /dev/urandom. */
+
+const vector VECTORS[] = {
+    {
+        .name = "short",
+        .key = {
+            0xdc, 0xd8, 0xcb, 0x6d, 0xf9, 0xda, 0xf2, 0xc9,
+            0x7c, 0xc1, 0x6a, 0xff, 0x7e, 0x1d, 0x27, 0xa3
+        },
+        .nonce = {
+            0xcd, 0x6f, 0x24, 0xe1, 0xf8, 0xcd, 0x64, 0xde,
+            0x18, 0x2f, 0x92, 0xab, 0xdb, 0xfa, 0xff
+        },
+        .auth_len = 8,
+        .auth = (uint8_t*)"deadbeef",
+        .message_len = 4,
+        .message = (uint8_t[]){
+            0xde, 0xad, 0xbe, 0xef
+        }
+    },
+    {
+        .name = "block-sized",
+        .key = {
+            0x3f, 0x75, 0x05, 0x0a, 0xc1, 0xc6, 0xb5, 0xe0,
+            0x57, 0x2e, 0x60, 0x9e, 0x32, 0xab, 0xbe, 0xd0
+        },
+        .nonce = {
+            0xcd, 0x7d, 0xb0, 0xa0, 0x62, 0xdf, 0xda, 0x0a,
+            0x23, 0x7a, 0x17, 0x32, 0x60, 0x42, 0xef
+        },
+        .auth_len = 13,
+        .auth = (uint8_t*)"some metadata",
+        .message_len = 2*BLOCK_BYTES,
+        .message = (uint8_t*)"32-byte long, i.e. 2*BLOCK_BYTES"
+    },
+    {
+        .name = "arbitrarily long",
+        .key = {
+            0x13, 0x6a, 0x99, 0xfd, 0xbf, 0x88, 0xac, 0xf8,
+            0x92, 0x7b, 0x27, 0xb1, 0x10, 0xa5, 0xe8, 0x73
+        },
+        .nonce = {
+            0x59, 0x41, 0xa7, 0x53, 0x0f, 0xde, 0xf1, 0xb1,
+            0xca, 0xd5, 0x80, 0xc4, 0x1c, 0x16, 0x2b
+        },
+        .auth_len = 30,
+        .auth = (uint8_t*)"a bunch of associated metadata",
+        .message_len = 59,
+        .message = (uint8_t*)"here comes the placeholder: foobar ipsum dolor sit baz quux"
+    }
+};
+
+
+int main()
+{
+    int diff = 0;
+
+    for (const vector *v=VECTORS; v<ARRAY_END(VECTORS); v++)
+    {
+        uint8_t ciphertext[v->message_len];
+        uint8_t tag[TAG_BYTES];
+
+        lilliput_ae_encrypt(
+            v->message_len, v->message,
+            v->auth_len, v->auth,
+            v->key, v->nonce,
+            ciphertext,
+            tag
+        );
+
+        uint8_t deciphered[v->message_len];
+        bool valid = lilliput_ae_decrypt(
+            v->message_len, ciphertext,
+            v->auth_len, v->auth,
+            v->key, v->nonce, tag,
+            deciphered
+        );
+
+        if (!valid)
+        {
+            REPORT_INVALID(v->name);
+            diff++;
+            continue;
+        }
+
+        if (memcmp(deciphered, v->message, v->message_len) != 0)
+        {
+            REPORT_DIFFERENCE(v->name, "deciphered plaintext");
+            diff++;
+            continue;
+        }
+    }
+
+    return diff;
+}