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This is a first-cut at improving the callback mechanisms used in

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key-generation and prime-checking functions. Rather than explicitly passing
callback functions and caller-defined context data for the callbacks, a new
structure BN_GENCB is defined that encapsulates this; a pointer to the
structure is passed to all such functions instead.

This wrapper structure allows the encapsulation of "old" and "new" style
callbacks - "new" callbacks return a boolean result on the understanding
that returning FALSE should terminate keygen/primality processing.  The
BN_GENCB abstraction will allow future callback modifications without
needing to break binary compatibility nor change the API function
prototypes. The new API functions have been given names ending in "_ex" and
the old functions are implemented as wrappers to the new ones.  The
OPENSSL_NO_DEPRECATED symbol has been introduced so that, if defined,
declaration of the older functions will be skipped. NB: Some
openssl-internal code will stick with the older callbacks for now, so
appropriate "#undef" logic will be put in place - this is in case the user
is *building* openssl (rather than *including* its headers) with this
symbol defined.

There is another change in the new _ex functions; the key-generation
functions do not return key structures but operate on structures passed by
the caller, the return value is a boolean. This will allow for a smoother
transition to having key-generation as "virtual function" in the various
***_METHOD tables.
This commit is contained in:
Geoff Thorpe
2002-12-08 05:24:31 +00:00
parent e90e719739
commit e9224c7177
25 changed files with 619 additions and 116 deletions
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10
crypto/dsa/dsa.h
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@@ -186,10 +186,20 @@ void *DSA_get_ex_data(DSA *d, int idx);
DSA * d2i_DSAPublicKey(DSA **a, const unsigned char **pp, long length);
DSA * d2i_DSAPrivateKey(DSA **a, const unsigned char **pp, long length);
DSA * d2i_DSAparams(DSA **a, const unsigned char **pp, long length);
/* Deprecated version */
#ifndef OPENSSL_NO_DEPRECATED
DSA * DSA_generate_parameters(int bits,
unsigned char *seed,int seed_len,
int *counter_ret, unsigned long *h_ret,void
(*callback)(int, int, void *),void *cb_arg);
#endif /* !defined(OPENSSL_NO_DEPRECATED) */
/* New version */
int DSA_generate_parameters_ex(DSA *dsa, int bits,
unsigned char *seed,int seed_len,
int *counter_ret, unsigned long *h_ret, BN_GENCB *cb);
int DSA_generate_key(DSA *a);
int i2d_DSAPublicKey(const DSA *a, unsigned char **pp);
int i2d_DSAPrivateKey(const DSA *a, unsigned char **pp);