1 files changed, 89 insertions, 0 deletions
diff --git a/src/lib/crypt_ops/crypto_curve25519.h b/src/lib/crypt_ops/crypto_curve25519.h
new file mode 100644
index 0000000000..8a5b9b2018
--- /dev/null
+++ b/src/lib/crypt_ops/crypto_curve25519.h
@@ -0,0 +1,89 @@
+/* Copyright (c) 2012-2018, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+#ifndef TOR_CRYPTO_CURVE25519_H
+#define TOR_CRYPTO_CURVE25519_H
+
+#include "common/testsupport.h"
+#include "lib/cc/torint.h"
+#include "common/crypto_digest.h"
+#include "common/crypto_openssl_mgt.h"
+
+/** Length of a curve25519 public key when encoded. */
+#define CURVE25519_PUBKEY_LEN 32
+/** Length of a curve25519 secret key when encoded. */
+#define CURVE25519_SECKEY_LEN 32
+/** Length of the result of a curve25519 handshake. */
+#define CURVE25519_OUTPUT_LEN 32
+
+/** Wrapper type for a curve25519 public key.
+ *
+ *  (We define a separate type for these to make it less likely that we'll
+ *  mistake them for secret keys.)
+ * */
+typedef struct curve25519_public_key_t {
+  uint8_t public_key[CURVE25519_PUBKEY_LEN];
+} curve25519_public_key_t;
+
+/** Wrapper type for a curve25519 secret key
+ *
+ * (We define a separate type for these to make it less likely that we'll
+ * mistake them for public keys.)
+ **/
+typedef struct curve25519_secret_key_t {
+  uint8_t secret_key[CURVE25519_SECKEY_LEN];
+} curve25519_secret_key_t;
+
+/** A paired public and private key for curve25519. **/
+typedef struct curve25519_keypair_t {
+  curve25519_public_key_t pubkey;
+  curve25519_secret_key_t seckey;
+} curve25519_keypair_t;
+
+/* These functions require that we actually know how to use curve25519 keys.
+ * The other data structures and functions in this header let us parse them,
+ * store them, and move them around.
+ */
+
+int curve25519_public_key_is_ok(const curve25519_public_key_t *);
+
+int curve25519_secret_key_generate(curve25519_secret_key_t *key_out,
+                                   int extra_strong);
+void curve25519_public_key_generate(curve25519_public_key_t *key_out,
+                                    const curve25519_secret_key_t *seckey);
+int curve25519_keypair_generate(curve25519_keypair_t *keypair_out,
+                                int extra_strong);
+
+void curve25519_handshake(uint8_t *output,
+                          const curve25519_secret_key_t *,
+                          const curve25519_public_key_t *);
+
+int curve25519_keypair_write_to_file(const curve25519_keypair_t *keypair,
+                                     const char *fname,
+                                     const char *tag);
+
+int curve25519_keypair_read_from_file(curve25519_keypair_t *keypair_out,
+                                      char **tag_out,
+                                      const char *fname);
+
+int curve25519_rand_seckey_bytes(uint8_t *out, int extra_strong);
+
+#ifdef CRYPTO_CURVE25519_PRIVATE
+STATIC int curve25519_impl(uint8_t *output, const uint8_t *secret,
+                           const uint8_t *basepoint);
+
+STATIC int curve25519_basepoint_impl(uint8_t *output, const uint8_t *secret);
+#endif /* defined(CRYPTO_CURVE25519_PRIVATE) */
+
+#define CURVE25519_BASE64_PADDED_LEN 44
+
+int curve25519_public_from_base64(curve25519_public_key_t *pkey,
+                                  const char *input);
+int curve25519_public_to_base64(char *output,
+                                const curve25519_public_key_t *pkey);
+
+void curve25519_set_impl_params(int use_ed);
+void curve25519_init(void);
+
+#endif /* !defined(TOR_CRYPTO_CURVE25519_H) */
+