First commit, Vystem v0.1

Blastproof/keygen/fors.h

@@ -0,0 +1,32 @@
+#ifndef SPX_FORS_H
+#define SPX_FORS_H
+
+#include <stdint.h>
+
+#include "params.h"
+#include "context.h"
+
+/**
+ * Signs a message m, deriving the secret key from sk_seed and the FTS address.
+ * Assumes m contains at least SPX_FORS_HEIGHT * SPX_FORS_TREES bits.
+ */
+#define fors_sign SPX_NAMESPACE(fors_sign)
+void fors_sign(unsigned char *sig, unsigned char *pk,
+               const unsigned char *m,
+               const spx_ctx* ctx,
+               const uint32_t fors_addr[8]);
+
+/**
+ * Derives the FORS public key from a signature.
+ * This can be used for verification by comparing to a known public key, or to
+ * subsequently verify a signature on the derived public key. The latter is the
+ * typical use-case when used as an FTS below an OTS in a hypertree.
+ * Assumes m contains at least SPX_FORS_HEIGHT * SPX_FORS_TREES bits.
+ */
+#define fors_pk_from_sig SPX_NAMESPACE(fors_pk_from_sig)
+void fors_pk_from_sig(unsigned char *pk,
+                      const unsigned char *sig, const unsigned char *m,
+                      const spx_ctx* ctx,
+                      const uint32_t fors_addr[8]);
+
+#endif