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Add internal function evp_generic_do_all()

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This function is used to traverse all algorithm implementations for a
given operation type, and execute the given function for each of them.

For each algorithm implementation, a method is created and passed to
the given function, and then freed after that function's return.  If
the caller wishes to keep the method for longer, they must call the
appropriate up_ref function on the method, and they must also make
sure to free the passed methods at some point.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/9356)
This commit is contained in:
Richard Levitte 2019-07-13 06:53:44 +02:00
parent 84d167f6eb
commit 3d96a51c09
2 changed files with 45 additions and 0 deletions
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38
crypto/evp/evp_fetch.c
View file

@ -236,3 +236,41 @@ int EVP_set_default_properties(OPENSSL_CTX *libctx, const char *propq)
EVPerr(EVP_F_EVP_SET_DEFAULT_PROPERTIES, ERR_R_INTERNAL_ERROR);
return 0;
}
struct do_all_data_st {
void (*user_fn)(void *method, void *arg);
void *user_arg;
void *(*new_method)(const char *name, const OSSL_DISPATCH *fns,
OSSL_PROVIDER *prov);
void (*free_method)(void *);
};
static void do_one(OSSL_PROVIDER *provider, const OSSL_ALGORITHM *algo,
int no_store, void *vdata)
{
struct do_all_data_st *data = vdata;
void *method = data->new_method(algo->algorithm_name,
algo->implementation, provider);
if (method != NULL) {
data->user_fn(method, data->user_arg);
data->free_method(method);
}
}
void evp_generic_do_all(OPENSSL_CTX *libctx, int operation_id,
void (*user_fn)(void *method, void *arg),
void *user_arg,
void *(*new_method)(const char *name,
const OSSL_DISPATCH *fns,
OSSL_PROVIDER *prov),
void (*free_method)(void *))
{
struct do_all_data_st data;
data.new_method = new_method;
data.free_method = free_method;
data.user_fn = user_fn;
data.user_arg = user_arg;
ossl_algorithm_do_all(libctx, operation_id, NULL, do_one, &data);
}

7
crypto/evp/evp_locl.h
View file

@ -139,6 +139,13 @@ void *evp_generic_fetch(OPENSSL_CTX *ctx, int operation_id,
OSSL_PROVIDER *prov),
int (*up_ref_method)(void *),
void (*free_method)(void *));
void evp_generic_do_all(OPENSSL_CTX *libctx, int operation_id,
void (*user_fn)(void *method, void *arg),
void *user_arg,
void *(*new_method)(const char *name,
const OSSL_DISPATCH *fns,
OSSL_PROVIDER *prov),
void (*free_method)(void *));
/* Helper functions to avoid duplicating code */