1 files changed, 42 insertions, 0 deletions
diff --git a/tools/genkeypair.c b/tools/genkeypair.c
new file mode 100644
index 0000000..7db856b
--- /dev/null
+++ b/tools/genkeypair.c
@@ -0,0 +1,42 @@
+// *SUPER* low effort x25519 keygen tool, for lack of better tool on hand.
+// To compile:
+// Unix: $CC -O2 -Dbool=_Bool -o.build/genkeypair tools/genkeypair.c
+// Windows: clang-cl -fuse-ld=lld -O2 -Dbool=_Bool -Fe.build/genkeypair.exe tools/genkeypair.c /link advapi32.lib
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "../src/3p/monocypher/monocypher.c" // yeah, we're doing this.
+#include "../src/os.h"
+
+int main(void) {
+	unsigned char prv[32], pub[32];
+	os_randombytes(prv, sizeof(prv));
+	crypto_x25519_public_key(pub, prv);
+	// and now the worst string formatting code you've ever seen!!!
+	fputs("Private key: ", stdout);
+	for (int i = 0; i < sizeof(prv); i += 4) {
+		fprintf(stdout, "%.2X%.2X%.2X%.2X",
+				prv[i], prv[i + 1], prv[i + 2], prv[i + 3]);
+	}
+	fputs("\n{", stdout);
+	for (int i = 0; i < sizeof(prv) - 4; i += 4) {
+		fprintf(stdout, "0x%.2X, 0x%.2X, 0x%.2X, 0x%.2X, ",
+				prv[i], prv[i + 1], prv[i + 2], prv[i + 3]);
+	}
+	fprintf(stdout, "0x%.2X, 0x%.2X, 0x%.2X, 0x%.2X}\n\nPublic key:  ",
+			prv[sizeof(prv) - 4], prv[sizeof(prv) - 3],
+			prv[sizeof(prv) - 2], prv[sizeof(prv) - 1]);
+	for (int i = 0; i < sizeof(pub); i += 4) {
+		fprintf(stdout, "%.2X%.2X%.2X%.2X",
+				pub[i], pub[i + 1], pub[i + 2], pub[i + 3]);
+	}
+	fputs("\n{", stdout);
+	for (int i = 0; i < sizeof(pub) - 4; i += 4) {
+		fprintf(stdout, "0x%.2X, 0x%.2X, 0x%.2X, 0x%.2X, ",
+				pub[i], pub[i + 1], pub[i + 2], pub[i + 3]);
+	}
+	fprintf(stdout, "0x%.2X, 0x%.2X, 0x%.2X, 0x%.2X}\n",
+			pub[sizeof(pub) - 4], pub[sizeof(pub) - 3],
+			pub[sizeof(pub) - 2], pub[sizeof(pub) - 1]);
+}