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This change adds a new ENGINE called "dynamic" that allows new ENGINE

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implementations to be loaded from self-contained shared-libraries. It also
provides (in engine.h) definitions and macros to help implement a
self-contained ENGINE. Version control is handled in a way whereby the
loader or loadee can veto the load depending on any objections it has with
each other's declared interface level. The way this is currently
implemented assumes a veto will only take place when one side notices the
other's interface level is too *old*. If the other side is newer, it should
be assumed the newer version knows better whether to veto the load or not.
Version checking (like other "dynamic" settings) can be controlled using
the "dynamic" ENGINE's control commands. Also, the semantics for the
loading allow a shared-library ENGINE implementation to handle differing
interface levels on the fly (eg. loading secondary shared-libraries
depending on the versions required).

Code will be added soon to the existing ENGINEs to illustrate how they can
be built as external libraries rather than building statically into
libcrypto.

NB: Applications wanting to support "dynamic"-loadable ENGINEs will need to
add support for ENGINE "control commands". See apps/engine.c for an example
of this, and use "apps/openssl engine -vvvv" to test or experiment.
This commit is contained in:
Geoff Thorpe
2001-09-03 19:15:29 +00:00
parent 5b16639538
commit 9391f97715
6 changed files with 531 additions and 6 deletions
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7
crypto/engine/engine_err.c
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@@ -79,6 +79,9 @@ static ERR_STRING_DATA ENGINE_str_functs[]=
{ERR_PACK(0,ENGINE_F_CSWIFT_MOD_EXP,0), "CSWIFT_MOD_EXP"},
{ERR_PACK(0,ENGINE_F_CSWIFT_MOD_EXP_CRT,0), "CSWIFT_MOD_EXP_CRT"},
{ERR_PACK(0,ENGINE_F_CSWIFT_RSA_MOD_EXP,0), "CSWIFT_RSA_MOD_EXP"},
{ERR_PACK(0,ENGINE_F_DYNAMIC_CTRL,0), "DYNAMIC_CTRL"},
{ERR_PACK(0,ENGINE_F_DYNAMIC_GET_DATA_CTX,0), "DYNAMIC_GET_DATA_CTX"},
{ERR_PACK(0,ENGINE_F_DYNAMIC_LOAD,0), "DYNAMIC_LOAD"},
{ERR_PACK(0,ENGINE_F_ENGINE_ADD,0), "ENGINE_add"},
{ERR_PACK(0,ENGINE_F_ENGINE_BY_ID,0), "ENGINE_by_id"},
{ERR_PACK(0,ENGINE_F_ENGINE_CMD_IS_EXECUTABLE,0), "ENGINE_cmd_is_executable"},
@@ -118,6 +121,7 @@ static ERR_STRING_DATA ENGINE_str_functs[]=
{ERR_PACK(0,ENGINE_F_NURON_FINISH,0), "NURON_FINISH"},
{ERR_PACK(0,ENGINE_F_NURON_INIT,0), "NURON_INIT"},
{ERR_PACK(0,ENGINE_F_NURON_MOD_EXP,0), "NURON_MOD_EXP"},
{ERR_PACK(0,ENGINE_F_SET_DATA_CTX,0), "SET_DATA_CTX"},
{ERR_PACK(0,ENGINE_F_UBSEC_CTRL,0), "UBSEC_CTRL"},
{ERR_PACK(0,ENGINE_F_UBSEC_DSA_SIGN,0), "UBSEC_DSA_SIGN"},
{ERR_PACK(0,ENGINE_F_UBSEC_DSA_VERIFY,0), "UBSEC_DSA_VERIFY"},
@@ -155,6 +159,7 @@ static ERR_STRING_DATA ENGINE_str_reasons[]=
{ENGINE_R_ID_OR_NAME_MISSING ,"'id' or 'name' missing"},
{ENGINE_R_INIT_FAILED ,"init failed"},
{ENGINE_R_INTERNAL_LIST_ERROR ,"internal list error"},
{ENGINE_R_INVALID_ARGUMENT ,"invalid argument"},
{ENGINE_R_INVALID_CMD_NAME ,"invalid cmd name"},
{ENGINE_R_INVALID_CMD_NUMBER ,"invalid cmd number"},
{ENGINE_R_MISSING_KEY_COMPONENTS ,"missing key components"},
@@ -162,6 +167,7 @@ static ERR_STRING_DATA ENGINE_str_reasons[]=
{ENGINE_R_NOT_LOADED ,"not loaded"},
{ENGINE_R_NO_CALLBACK ,"no callback"},
{ENGINE_R_NO_CONTROL_FUNCTION ,"no control function"},
{ENGINE_R_NO_INDEX ,"no index"},
{ENGINE_R_NO_KEY ,"no key"},
{ENGINE_R_NO_LOAD_FUNCTION ,"no load function"},
{ENGINE_R_NO_REFERENCE ,"no reference"},
@@ -174,6 +180,7 @@ static ERR_STRING_DATA ENGINE_str_reasons[]=
{ENGINE_R_RSA_NOT_IMPLEMENTED ,"rsa not implemented"},
{ENGINE_R_SIZE_TOO_LARGE_OR_TOO_SMALL ,"size too large or too small"},
{ENGINE_R_UNIT_FAILURE ,"unit failure"},
{ENGINE_R_VERSION_INCOMPATIBILITY ,"version incompatibility"},
{0,NULL}
};