add external dependencies in a pre-built way to avoid incompatibilities

external/include/sodium/crypto_core_ristretto255.h

@@ -0,0 +1,100 @@
+#ifndef crypto_core_ristretto255_H
+#define crypto_core_ristretto255_H
+
+#include <stddef.h>
+#include "export.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define crypto_core_ristretto255_BYTES 32
+SODIUM_EXPORT
+size_t crypto_core_ristretto255_bytes(void);
+
+#define crypto_core_ristretto255_HASHBYTES 64
+SODIUM_EXPORT
+size_t crypto_core_ristretto255_hashbytes(void);
+
+#define crypto_core_ristretto255_SCALARBYTES 32
+SODIUM_EXPORT
+size_t crypto_core_ristretto255_scalarbytes(void);
+
+#define crypto_core_ristretto255_NONREDUCEDSCALARBYTES 64
+SODIUM_EXPORT
+size_t crypto_core_ristretto255_nonreducedscalarbytes(void);
+
+SODIUM_EXPORT
+int crypto_core_ristretto255_is_valid_point(const unsigned char *p)
+            __attribute__ ((nonnull));
+
+SODIUM_EXPORT
+int crypto_core_ristretto255_add(unsigned char *r,
+                                 const unsigned char *p, const unsigned char *q)
+            __attribute__ ((nonnull));
+
+SODIUM_EXPORT
+int crypto_core_ristretto255_sub(unsigned char *r,
+                                 const unsigned char *p, const unsigned char *q)
+            __attribute__ ((nonnull));
+
+SODIUM_EXPORT
+int crypto_core_ristretto255_from_hash(unsigned char *p,
+                                       const unsigned char *r)
+            __attribute__ ((nonnull));
+
+SODIUM_EXPORT
+void crypto_core_ristretto255_random(unsigned char *p)
+            __attribute__ ((nonnull));
+
+SODIUM_EXPORT
+void crypto_core_ristretto255_scalar_random(unsigned char *r)
+            __attribute__ ((nonnull));
+
+SODIUM_EXPORT
+int crypto_core_ristretto255_scalar_invert(unsigned char *recip,
+                                           const unsigned char *s)
+            __attribute__ ((nonnull));
+
+SODIUM_EXPORT
+void crypto_core_ristretto255_scalar_negate(unsigned char *neg,
+                                            const unsigned char *s)
+            __attribute__ ((nonnull));
+
+SODIUM_EXPORT
+void crypto_core_ristretto255_scalar_complement(unsigned char *comp,
+                                                const unsigned char *s)
+            __attribute__ ((nonnull));
+
+SODIUM_EXPORT
+void crypto_core_ristretto255_scalar_add(unsigned char *z,
+                                         const unsigned char *x,
+                                         const unsigned char *y)
+            __attribute__ ((nonnull));
+
+SODIUM_EXPORT
+void crypto_core_ristretto255_scalar_sub(unsigned char *z,
+                                         const unsigned char *x,
+                                         const unsigned char *y)
+            __attribute__ ((nonnull));
+
+SODIUM_EXPORT
+void crypto_core_ristretto255_scalar_mul(unsigned char *z,
+                                         const unsigned char *x,
+                                         const unsigned char *y)
+            __attribute__ ((nonnull));
+
+/*
+ * The interval `s` is sampled from should be at least 317 bits to ensure almost
+ * uniformity of `r` over `L`.
+ */
+SODIUM_EXPORT
+void crypto_core_ristretto255_scalar_reduce(unsigned char *r,
+                                            const unsigned char *s)
+            __attribute__ ((nonnull));
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif