free NULL cleanup.

[openssl.git] / doc / crypto / BN_generate_prime.pod

diff --git a/doc/crypto/BN_generate_prime.pod b/doc/crypto/BN_generate_prime.pod
index f1f2265a866580b89947548a6eb535093d6f8a2d..f5b05e8328ad194b046ef7448ba96dd4beaa1140 100644 (file)
--- a/doc/crypto/BN_generate_prime.pod
+++ b/doc/crypto/BN_generate_prime.pod
@@ -3,8 +3,9 @@
 =head1 NAME
 
 BN_generate_prime_ex, BN_is_prime_ex, BN_is_prime_fasttest_ex, BN_GENCB_call,
-BN_GENCB_set_old, BN_GENCB_set, BN_generate_prime, BN_is_prime,
-BN_is_prime_fasttest - generate primes and test for primality
+BN_GENCB_new, BN_GENCB_free, BN_GENCB_set_old, BN_GENCB_set, BN_GENCB_get_arg,
+BN_generate_prime, BN_is_prime, BN_is_prime_fasttest - generate primes and test
+for primality
 
 =head1 SYNOPSIS
 
@@ -20,10 +21,17 @@ BN_is_prime_fasttest - generate primes and test for primality
 
  int BN_GENCB_call(BN_GENCB *cb, int a, int b);
 
- #define BN_GENCB_set_old(gencb, callback, cb_arg) ...
+ BN_GENCB *BN_GENCB_new(void);
 
- #define BN_GENCB_set(gencb, callback, cb_arg) ...
+ void BN_GENCB_free(BN_GENCB *cb);
 
+ void BN_GENCB_set_old(BN_GENCB *gencb,
+     void (*callback)(int, int, void *), void *cb_arg);
+
+ void BN_GENCB_set(BN_GENCB *gencb,
+     int (*callback)(int, int, BN_GENCB *), void *cb_arg);
+
+ void *BN_GENCB_get_arg(BN_GENCB *cb);
 
 Deprecated:
 
@@ -103,17 +111,23 @@ B<BN_GENCB> structure that are supported: "new" style and "old" style. New
 programs should prefer the "new" style, whilst the "old" style is provided
 for backwards compatibility purposes.
 
+A BN_GENCB structure should be created through a call to BN_GENCB_new, and freed
+through a call to BN_GENCB_free.
+
 For "new" style callbacks a BN_GENCB structure should be initialised with a
-call to BN_GENCB_set, where B<gencb> is a B<BN_GENCB *>, B<callback> is of
+call to BN_GENCB_set(), where B<gencb> is a B<BN_GENCB *>, B<callback> is of
 type B<int (*callback)(int, int, BN_GENCB *)> and B<cb_arg> is a B<void *>.
 "Old" style callbacks are the same except they are initialised with a call
-to BN_GENCB_set_old and B<callback> is of type
+to BN_GENCB_set_old() and B<callback> is of type
 B<void (*callback)(int, int, void *)>.
 
 A callback is invoked through a call to B<BN_GENCB_call>. This will check
 the type of the callback and will invoke B<callback(a, b, gencb)> for new
 style callbacks or B<callback(a, b, cb_arg)> for old style.
 
+It is possible to obtained the argument associated with a BN_GENCB structure
+(set via a call to BN_GENCB_set or BN_GENCB_set_old) using BN_GENCB_get_arg.
+
 BN_generate_prime (deprecated) works in the same way as
 BN_generate_prime_ex but expects an old style callback function
 directly in the B<callback> parameter, and an argument to pass to it in
@@ -132,10 +146,31 @@ prime with an error probability of less than 0.25^B<nchecks>, and
 
 BN_generate_prime() returns the prime number on success, B<NULL> otherwise.
 
+BN_GENCB_new returns a pointer to a BN_GENCB structure on success, or B<NULL>
+otherwise.
+
+BN_GENCB_get_arg returns the argument previously associated with a BN_GENCB
+structure.
+
 Callback functions should return 1 on success or 0 on error.
 
 The error codes can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>.
 
+=head1 REMOVED FUNCTIONALITY
+
+As of OpenSSL 1.1.0 it is no longer possible to create a BN_GENCB structure
+directly, as in:
+
+ BN_GENCB callback;
+
+Instead applications should create a BN_GENCB structure using BN_GENCB_new:
+
+ BN_GENCB *callback;
+ callback = BN_GENCB_new();
+ if(!callback) /* handle error */
+ ...
+ BN_GENCB_free(callback);
+
 =head1 SEE ALSO
 
 L<bn(3)|bn(3)>, L<ERR_get_error(3)|ERR_get_error(3)>, L<rand(3)|rand(3)>
@@ -145,6 +180,7 @@ L<bn(3)|bn(3)>, L<ERR_get_error(3)|ERR_get_error(3)>, L<rand(3)|rand(3)>
 The B<cb_arg> arguments to BN_generate_prime() and to BN_is_prime()
 were added in SSLeay 0.9.0. The B<ret> argument to BN_generate_prime()
 was added in SSLeay 0.9.1.
-BN_is_prime_fasttest() was added in OpenSSL 0.9.5.
+BN_is_prime_fasttest() was added in OpenSSL 0.9.5. BN_GENCB_new, BN_GENCB_free
+and BN_GENCB_get_arg were added in OpenSSL 1.1.0
 
 =cut