Initial

main.c

@@ -0,0 +1,66 @@
+#include "monocypher.h"
+#include "seed.h"
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define PRINT_HEX(arr, len) print_hex(#arr, (const uint8_t *)(arr), (len))
+
+void print_hex(const char *name, const uint8_t *data, size_t len) {
+    printf("%s (%zu bytes):\n", name, len);
+
+    for (size_t i = 0; i < len; i++) {
+        if (i % 16 == 0)
+            printf("  %04zx: ", i);
+
+        printf("%02X ", data[i]);
+
+        if ((i + 1) % 16 == 0 || i + 1 == len)
+            printf("\n");
+    }
+}
+
+int main(void) {
+    /* These can be used if not on bare metal */
+    // uint8_t seed[32];
+    // arc4random_buf(seed, 32);
+
+    uint8_t sk[64]; /* secret key          */
+    uint8_t pk[32]; /* Matching public key */
+    PRINT_HEX(seed, seed_len);
+
+    /* The seed is wiped automatically here */
+    crypto_eddsa_key_pair(sk, pk, seed);
+
+    print_hex("PubKey", pk, 32);
+    print_hex("SecKey", sk, 64);
+
+    uint8_t message[4];
+
+    /* Generate a random message */
+    arc4random_buf(message, 4);
+    PRINT_HEX(message, sizeof(message));
+
+    uint8_t sig[64];
+
+    /* Sign it and store the signature in sig[] */
+    crypto_eddsa_sign(sig, sk, (const uint8_t *)message, sizeof(message));
+    print_hex("Signature:", sig, 64);
+
+    /* Assert valid */
+    assert(!crypto_eddsa_check(sig, pk, (const uint8_t *)message, sizeof(message)));
+
+    /* Tamper with payload to invalidate the signature */
+    arc4random_buf(message, 4);
+    PRINT_HEX(message, sizeof(message));
+
+    /* Assert invalid */
+    assert(crypto_eddsa_check(sig, pk, (const uint8_t *)message, sizeof(message)));
+
+    /* Wipe the secret key if it is no longer needed */
+    crypto_wipe(sk, 32);
+
+    printf("Program finished: Ok!\n");
+}