90 lines
3.1 KiB
C
90 lines
3.1 KiB
C
/* Copyright (c) 2012-2017, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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#ifndef TOR_CRYPTO_CURVE25519_H
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#define TOR_CRYPTO_CURVE25519_H
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#include "testsupport.h"
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#include "torint.h"
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#include "crypto_digest.h"
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#include "crypto_openssl_mgt.h"
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/** Length of a curve25519 public key when encoded. */
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#define CURVE25519_PUBKEY_LEN 32
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/** Length of a curve25519 secret key when encoded. */
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#define CURVE25519_SECKEY_LEN 32
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/** Length of the result of a curve25519 handshake. */
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#define CURVE25519_OUTPUT_LEN 32
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/** Wrapper type for a curve25519 public key.
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*
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* (We define a separate type for these to make it less likely that we'll
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* mistake them for secret keys.)
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* */
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typedef struct curve25519_public_key_t {
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uint8_t public_key[CURVE25519_PUBKEY_LEN];
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} curve25519_public_key_t;
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/** Wrapper type for a curve25519 secret key
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*
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* (We define a separate type for these to make it less likely that we'll
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* mistake them for public keys.)
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**/
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typedef struct curve25519_secret_key_t {
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uint8_t secret_key[CURVE25519_SECKEY_LEN];
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} curve25519_secret_key_t;
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/** A paired public and private key for curve25519. **/
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typedef struct curve25519_keypair_t {
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curve25519_public_key_t pubkey;
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curve25519_secret_key_t seckey;
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} curve25519_keypair_t;
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/* These functions require that we actually know how to use curve25519 keys.
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* The other data structures and functions in this header let us parse them,
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* store them, and move them around.
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*/
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int curve25519_public_key_is_ok(const curve25519_public_key_t *);
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int curve25519_secret_key_generate(curve25519_secret_key_t *key_out,
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int extra_strong);
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void curve25519_public_key_generate(curve25519_public_key_t *key_out,
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const curve25519_secret_key_t *seckey);
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int curve25519_keypair_generate(curve25519_keypair_t *keypair_out,
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int extra_strong);
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void curve25519_handshake(uint8_t *output,
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const curve25519_secret_key_t *,
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const curve25519_public_key_t *);
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int curve25519_keypair_write_to_file(const curve25519_keypair_t *keypair,
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const char *fname,
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const char *tag);
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int curve25519_keypair_read_from_file(curve25519_keypair_t *keypair_out,
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char **tag_out,
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const char *fname);
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int curve25519_rand_seckey_bytes(uint8_t *out, int extra_strong);
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#ifdef CRYPTO_CURVE25519_PRIVATE
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STATIC int curve25519_impl(uint8_t *output, const uint8_t *secret,
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const uint8_t *basepoint);
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STATIC int curve25519_basepoint_impl(uint8_t *output, const uint8_t *secret);
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#endif /* defined(CRYPTO_CURVE25519_PRIVATE) */
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#define CURVE25519_BASE64_PADDED_LEN 44
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int curve25519_public_from_base64(curve25519_public_key_t *pkey,
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const char *input);
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int curve25519_public_to_base64(char *output,
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const curve25519_public_key_t *pkey);
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void curve25519_set_impl_params(int use_ed);
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void curve25519_init(void);
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#endif /* !defined(TOR_CRYPTO_CURVE25519_H) */
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