diff options
author | Ulf Möller <ulf@openssl.org> | 2001-02-20 00:23:07 +0000 |
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committer | Ulf Möller <ulf@openssl.org> | 2001-02-20 00:23:07 +0000 |
commit | 335c4f0966eda1374cd6f7ed646b6c2adc998885 (patch) | |
tree | 7c39b7d8e9192951f9ff7be6c351cbc465039cfb /doc/crypto/BN_rand.pod | |
parent | 5003a61b9f62d865bc1261af157dc283e7c31249 (diff) |
BN_rand_range() needs a BN_rand() variant that doesn't set the MSB.
Diffstat (limited to 'doc/crypto/BN_rand.pod')
-rw-r--r-- | doc/crypto/BN_rand.pod | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/doc/crypto/BN_rand.pod b/doc/crypto/BN_rand.pod index 2a8bed5fed..cbae2fca97 100644 --- a/doc/crypto/BN_rand.pod +++ b/doc/crypto/BN_rand.pod @@ -17,10 +17,12 @@ BN_rand, BN_pseudo_rand - generate pseudo-random number =head1 DESCRIPTION BN_rand() generates a cryptographically strong pseudo-random number of -B<bits> bits in length and stores it in B<rnd>. If B<top> is true, the -two most significant bits of the number will be set to 1, so that the -product of two such random numbers will always have 2*B<bits> length. -If B<bottom> is true, the number will be odd. +B<bits> bits in length and stores it in B<rnd>. If B<top> is -1, the +most significant bit of the random number can be zero. If B<top> is 0, +it is set to 1, and if B<top> is 1, the two most significant bits of +the number will be set to 1, so that the product of two such random +numbers will always have 2*B<bits> length. If B<bottom> is true, the +number will be odd. BN_pseudo_rand() does the same, but pseudo-random numbers generated by this function are not necessarily unpredictable. They can be used for @@ -45,7 +47,7 @@ L<RAND_add(3)|RAND_add(3)>, L<RAND_bytes(3)|RAND_bytes(3)> =head1 HISTORY BN_rand() is available in all versions of SSLeay and OpenSSL. -BN_pseudo_rand() was added in OpenSSL 0.9.5, and BN_rand_range() -in OpenSSL 0.9.6a. +BN_pseudo_rand() was added in OpenSSL 0.9.5. The B<top> == -1 case +and the function BN_rand_range() were added in OpenSSL 0.9.6a. =cut |