1 files changed, 40 insertions, 0 deletions
diff --git a/libs/libsodium/src/crypto_vrf/rfc9381/keypair.c b/libs/libsodium/src/crypto_vrf/rfc9381/keypair.c
new file mode 100644
index 0000000000..ecefa5e054
--- /dev/null
+++ b/libs/libsodium/src/crypto_vrf/rfc9381/keypair.c
@@ -0,0 +1,40 @@
+#include <string.h>
+
+#include "crypto_hash_sha512.h"
+#include "crypto_vrf_rfc9381.h"
+#include "private/ed25519_ref10.h"
+#include "randombytes.h"
+#include "utils.h"
+
+int
+crypto_vrf_rfc9381_seed_keypair(unsigned char *pk, unsigned char *sk,
+                                    const unsigned char *seed)
+{
+    ge25519_p3 A;
+
+    crypto_hash_sha512(sk, seed, 32);
+    sk[0] &= 248;
+    sk[31] &= 127;
+    sk[31] |= 64;
+
+    ge25519_scalarmult_base(&A, sk);
+    ge25519_p3_tobytes(pk, &A);
+
+    memmove(sk, seed, 32);
+    memmove(sk + 32, pk, 32);
+
+    return 0;
+}
+
+int
+crypto_vrf_rfc9381_keypair(unsigned char *pk, unsigned char *sk)
+{
+    unsigned char seed[32];
+    int           ret;
+
+    randombytes_buf(seed, sizeof seed);
+    ret = crypto_vrf_rfc9381_seed_keypair(pk, sk, seed);
+    sodium_memzero(seed, sizeof seed);
+
+    return ret;
+}