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Diffstat (limited to 'roms/edk2/CryptoPkg/Library/OpensslLib/openssl/doc/man3/BN_rand.pod')
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diff --git a/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/doc/man3/BN_rand.pod b/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/doc/man3/BN_rand.pod new file mode 100644 index 000000000..d57348e62 --- /dev/null +++ b/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/doc/man3/BN_rand.pod @@ -0,0 +1,99 @@ +=pod + +=head1 NAME + +BN_rand, BN_priv_rand, BN_pseudo_rand, +BN_rand_range, BN_priv_rand_range, BN_pseudo_rand_range +- generate pseudo-random number + +=head1 SYNOPSIS + + #include <openssl/bn.h> + + int BN_rand(BIGNUM *rnd, int bits, int top, int bottom); + + int BN_priv_rand(BIGNUM *rnd, int bits, int top, int bottom); + + int BN_pseudo_rand(BIGNUM *rnd, int bits, int top, int bottom); + + int BN_rand_range(BIGNUM *rnd, BIGNUM *range); + + int BN_priv_rand_range(BIGNUM *rnd, BIGNUM *range); + + int BN_pseudo_rand_range(BIGNUM *rnd, BIGNUM *range); + +=head1 DESCRIPTION + +BN_rand() generates a cryptographically strong pseudo-random number of +B<bits> in length and stores it in B<rnd>. +If B<bits> is less than zero, or too small to +accommodate the requirements specified by the B<top> and B<bottom> +parameters, an error is returned. +The B<top> parameters specifies +requirements on the most significant bit of the generated number. +If it is B<BN_RAND_TOP_ANY>, there is no constraint. +If it is B<BN_RAND_TOP_ONE>, the top bit must be one. +If it is B<BN_RAND_TOP_TWO>, 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 B<BN_RAND_BOTTOM_ODD>, the number will be odd; if it +is B<BN_RAND_BOTTOM_ANY> it can be odd or even. +If B<bits> is 1 then B<top> cannot also be B<BN_RAND_FLG_TOPTWO>. + +BN_rand_range() generates a cryptographically strong pseudo-random +number B<rnd> in the range 0 E<lt>= B<rnd> E<lt> B<range>. + +BN_priv_rand() and BN_priv_rand_range() have the same semantics as +BN_rand() and BN_rand_range() respectively. They are intended to be +used for generating values that should remain private, and mirror the +same difference between L<RAND_bytes(3)> and L<RAND_priv_bytes(3)>. + +=head1 NOTES + +Always check the error return value of these functions and do not take +randomness for granted: an error occurs if the CSPRNG has not been +seeded with enough randomness to ensure an unpredictable byte sequence. + +=head1 RETURN VALUES + +The functions return 1 on success, 0 on error. +The error codes can be obtained by L<ERR_get_error(3)>. + +=head1 SEE ALSO + +L<ERR_get_error(3)>, +L<RAND_add(3)>, +L<RAND_bytes(3)>, +L<RAND_priv_bytes(3)>, +L<RAND(7)>, +L<RAND_DRBG(7)> + +=head1 HISTORY + +=over 2 + +=item * + +Starting with OpenSSL release 1.1.0, BN_pseudo_rand() has been identical +to BN_rand() and BN_pseudo_rand_range() has been identical to +BN_rand_range(). +The "pseudo" functions should not be used and may be deprecated in +a future release. + +=item * + +The +BN_priv_rand() and BN_priv_rand_range() functions were added in OpenSSL 1.1.1. + +=back + +=head1 COPYRIGHT + +Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved. + +Licensed under the OpenSSL license (the "License"). You may not use +this file except in compliance with the License. You can obtain a copy +in the file LICENSE in the source distribution or at +L<https://www.openssl.org/source/license.html>. + +=cut |