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ecdh: Implement ECDH using libgcrypt

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* include/libssh/crypto.h (struct ssh_crypto_struct): Provide a
suitable 'ecdh_privkey'.
* include/libssh/ecdh.h: Also define 'HAVE_ECDH' if we do ECC using
libgcrypt.
(ecdh_build_k): New prototype.
* src/CMakeLists.txt (libssh_SRCS): Add backend-specific files.
* src/ecdh.c: Move backend-specific parts to...
* src/ecdh_crypto.c: ... this file.
* src/ecdh_gcrypt.c: New file.
* src/wrapper.c (crypto_free): Free 'ecdh_privkey'.

Signed-off-by: Justus Winter <justus@g10code.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
This commit is contained in:
Justus Winter
2016-05-02 16:00:26 +02:00
committed by Andreas Schneider
parent f62cded9f0
commit e3a866b8c1
7 changed files with 645 additions and 266 deletions
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4
include/libssh/crypto.h
View File

@@ -76,7 +76,11 @@ enum ssh_cipher_e {
struct ssh_crypto_struct {
bignum e,f,x,k,y;
#ifdef HAVE_ECDH
#ifdef HAVE_OPENSSL_ECC
EC_KEY *ecdh_privkey;
#elif defined HAVE_GCRYPT_ECC
gcry_sexp_t ecdh_privkey;
#endif
ssh_string ecdh_client_pubkey;
ssh_string ecdh_server_pubkey;
#endif

10
include/libssh/ecdh.h
View File

@@ -33,9 +33,17 @@
#endif /* HAVE_OPENSSL_ECDH_H */
#endif /* HAVE_LIBCRYPTO */
int ssh_client_ecdh_init(ssh_session session);
#ifdef HAVE_GCRYPT_ECC
#define HAVE_ECDH 1
#endif
/* Common functions. */
int ssh_client_ecdh_reply(ssh_session session, ssh_buffer packet);
/* Backend-specific functions. */
int ssh_client_ecdh_init(ssh_session session);
int ecdh_build_k(ssh_session session);
#ifdef WITH_SERVER
int ssh_server_ecdh_init(ssh_session session, ssh_buffer packet);
#endif /* WITH_SERVER */