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-rw-r--r--src/seed.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/src/seed.c b/src/seed.c
new file mode 100644
index 0000000..25e5182
--- /dev/null
+++ b/src/seed.c
@@ -0,0 +1,40 @@
+#include "ed25519.h"
+
+#ifndef ED25519_NO_SEED
+
+#ifdef _WIN32
+#include <Windows.h>
+#include <Wincrypt.h>
+#else
+#include <stdio.h>
+#endif
+
+int ed25519_create_seed(unsigned char *seed) {
+#ifdef _WIN32
+ HCRYPTPROV prov;
+
+ if (!CryptAcquireContext(&prov, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
+ return 1;
+ }
+
+ if (!CryptGenRandom(prov, 32, seed)) {
+ CryptReleaseContext(prov, 0);
+ return 1;
+ }
+
+ CryptReleaseContext(prov, 0);
+#else
+ FILE *f = fopen("/dev/urandom", "rb");
+
+ if (f == NULL) {
+ return 1;
+ }
+
+ fread(seed, 1, 32, f);
+ fclose(f);
+#endif
+
+ return 0;
+}
+
+#endif \ No newline at end of file