Make sure all BIGNUM operations work within the FIPS provider

The FIPS provider does not have a default OPENSSL_CTX so, where
necessary, we need to ensure we can always access an explicit
OPENSSL_CTX. We remove functions from the FIPS provider that use
the default OPENSSL_CTX, and fixup some places which were using
those removed functions.

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/9310)

1 files changed, 19 insertions, 7 deletions

diff --git a/doc/man3/BN_generate_prime.pod b/doc/man3/BN_generate_prime.pod
index eb5d89a3dc..5de646d916 100644
--- a/doc/man3/BN_generate_prime.pod
+++ b/doc/man3/BN_generate_prime.pod
@@ -2,15 +2,19 @@
 
 =head1 NAME
 
-BN_generate_prime_ex, BN_is_prime_ex, BN_is_prime_fasttest_ex, BN_GENCB_call,
-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
+BN_generate_prime_ex2, BN_generate_prime_ex, BN_is_prime_ex,
+BN_is_prime_fasttest_ex, BN_GENCB_call, 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
 
  #include <openssl/bn.h>
 
+ int BN_generate_prime_ex2(BIGNUM *ret, int bits, int safe,
+                           const BIGNUM *add, const BIGNUM *rem, BN_GENCB *cb,
+                           BN_CTX *ctx);
+
  int BN_generate_prime_ex(BIGNUM *ret, int bits, int safe, const BIGNUM *add,
                           const BIGNUM *rem, BN_GENCB *cb);
 
@@ -50,9 +54,10 @@ L<openssl_user_macros(7)>:
 
 =head1 DESCRIPTION
 
-BN_generate_prime_ex() generates a pseudo-random prime number of
-at least bit length B<bits>. The returned number is probably prime
-with a negligible error.
+BN_generate_prime_ex2() generates a pseudo-random prime number of
+at least bit length B<bits> using the BN_CTX provided in B<ctx>. The value of
+B<ctx> must not be NULL.
+The returned number is probably prime with a negligible error.
 
 If B<ret> is not B<NULL>, it will be used to store the number.
 
@@ -94,6 +99,13 @@ that (p-1)/2 is also prime).
 The random generator must be seeded prior to calling BN_generate_prime_ex().
 If the automatic seeding or reseeding of the OpenSSL CSPRNG fails due to
 external circumstances (see L<RAND(7)>), the operation will fail.
+The random number generator configured for the OPENSSL_CTX associated with
+B<ctx> will be used.
+
+BN_generate_prime_ex() is the same as BN_generate_prime_ex2() except that no
+B<ctx> parameter is passed.
+In this case the random number generator associated with the default OPENSSL_CTX
+will be used.
 
 BN_is_prime_ex() and BN_is_prime_fasttest_ex() test if the number B<p> is
 prime.  The following tests are performed until one of them shows that