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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
src/wrapper.c
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@@ -161,7 +161,11 @@ void crypto_free(struct ssh_crypto_struct *crypto){
SAFE_FREE(crypto->ecdh_client_pubkey);
SAFE_FREE(crypto->ecdh_server_pubkey);
if(crypto->ecdh_privkey != NULL){
#ifdef HAVE_OPENSSL_ECC
EC_KEY_free(crypto->ecdh_privkey);
#elif defined HAVE_GCRYPT_ECC
gcry_sexp_release(crypto->ecdh_privkey);
#endif
crypto->ecdh_privkey = NULL;
}
#endif