Add flipbip app

applications/external/flipbip/lib/crypto/ed25519_donna/ed25519.h

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+#ifndef ED25519_H
+#define ED25519_H
+
+#include "../options.h"
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+typedef unsigned char ed25519_signature[64];
+typedef unsigned char ed25519_public_key[32];
+typedef unsigned char ed25519_secret_key[32];
+
+typedef unsigned char curve25519_key[32];
+
+typedef unsigned char ed25519_cosi_signature[32];
+
+void ed25519_publickey(const ed25519_secret_key sk, ed25519_public_key pk);
+void ed25519_publickey_ext(const ed25519_secret_key extsk, ed25519_public_key pk);
+
+int ed25519_sign_open(
+    const unsigned char* m,
+    size_t mlen,
+    const ed25519_public_key pk,
+    const ed25519_signature RS);
+void ed25519_sign(
+    const unsigned char* m,
+    size_t mlen,
+    const ed25519_secret_key sk,
+    ed25519_signature RS);
+void ed25519_sign_ext(
+    const unsigned char* m,
+    size_t mlen,
+    const ed25519_secret_key sk,
+    const ed25519_secret_key skext,
+    ed25519_signature RS);
+
+int ed25519_scalarmult(
+    ed25519_public_key res,
+    const ed25519_secret_key sk,
+    const ed25519_public_key pk);
+
+void curve25519_scalarmult(
+    curve25519_key mypublic,
+    const curve25519_key secret,
+    const curve25519_key basepoint);
+void curve25519_scalarmult_basepoint(curve25519_key mypublic, const curve25519_key secret);
+
+#if !defined(__GNUC__) || __GNUC__ > 4
+#define CONST const
+#else
+#define CONST
+#endif
+
+int ed25519_cosi_combine_publickeys(
+    ed25519_public_key res,
+    CONST ed25519_public_key* pks,
+    size_t n);
+void ed25519_cosi_combine_signatures(
+    ed25519_signature res,
+    const ed25519_public_key R,
+    CONST ed25519_cosi_signature* sigs,
+    size_t n);
+void ed25519_cosi_commit(ed25519_secret_key nonce, ed25519_public_key commitment);
+int ed25519_cosi_sign(
+    const unsigned char* m,
+    size_t mlen,
+    const ed25519_secret_key key,
+    const ed25519_secret_key nonce,
+    const ed25519_public_key R,
+    const ed25519_public_key pk,
+    ed25519_cosi_signature sig);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif // ED25519_H