1 files changed, 32 insertions, 0 deletions
diff --git a/lib/liboqs/src/sig/sphincs/pqclean_sphincs-shake256-256f-simple_clean/fors.h b/lib/liboqs/src/sig/sphincs/pqclean_sphincs-shake256-256f-simple_clean/fors.h
new file mode 100644
index 000000000..2cb13e990
--- /dev/null
+++ b/lib/liboqs/src/sig/sphincs/pqclean_sphincs-shake256-256f-simple_clean/fors.h
@@ -0,0 +1,32 @@
+#ifndef PQCLEAN_SPHINCSSHAKE256256FSIMPLE_CLEAN_FORS_H
+#define PQCLEAN_SPHINCSSHAKE256256FSIMPLE_CLEAN_FORS_H
+
+#include <stdint.h>
+
+#include "hash_state.h"
+#include "params.h"
+
+/**
+ * Signs a message m, deriving the secret key from sk_seed and the FTS address.
+ * Assumes m contains at least PQCLEAN_SPHINCSSHAKE256256FSIMPLE_CLEAN_FORS_HEIGHT * PQCLEAN_SPHINCSSHAKE256256FSIMPLE_CLEAN_FORS_TREES bits.
+ */
+void PQCLEAN_SPHINCSSHAKE256256FSIMPLE_CLEAN_fors_sign(
+    unsigned char *sig, unsigned char *pk,
+    const unsigned char *m,
+    const unsigned char *sk_seed, const unsigned char *pub_seed,
+    const uint32_t fors_addr[8], const hash_state *hash_state_seeded);
+
+/**
+ * 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 PQCLEAN_SPHINCSSHAKE256256FSIMPLE_CLEAN_FORS_HEIGHT * PQCLEAN_SPHINCSSHAKE256256FSIMPLE_CLEAN_FORS_TREES bits.
+ */
+void PQCLEAN_SPHINCSSHAKE256256FSIMPLE_CLEAN_fors_pk_from_sig(
+    unsigned char *pk,
+    const unsigned char *sig, const unsigned char *m,
+    const unsigned char *pub_seed, const uint32_t fors_addr[8],
+    const hash_state *hash_state_seeded);
+
+#endif