diff options
Diffstat (limited to 'lib/ssh/src/ssh_bits.erl')
| -rwxr-xr-x | lib/ssh/src/ssh_bits.erl | 64 |
1 files changed, 10 insertions, 54 deletions
diff --git a/lib/ssh/src/ssh_bits.erl b/lib/ssh/src/ssh_bits.erl index 21ddc5e8fe..3f0a06575c 100755 --- a/lib/ssh/src/ssh_bits.erl +++ b/lib/ssh/src/ssh_bits.erl @@ -1,19 +1,19 @@ %% %% %CopyrightBegin% -%% -%% Copyright Ericsson AB 2005-2009. All Rights Reserved. -%% +%% +%% Copyright Ericsson AB 2005-2011. All Rights Reserved. +%% %% The contents of this file are subject to the Erlang Public License, %% Version 1.1, (the "License"); you may not use this file except in %% compliance with the License. You should have received a copy of the %% Erlang Public License along with this software. If not, it can be %% retrieved online at http://www.erlang.org/. -%% +%% %% Software distributed under the License is distributed on an "AS IS" %% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See %% the License for the specific language governing rights and limitations %% under the License. -%% +%% %% %CopyrightEnd% %% @@ -34,7 +34,7 @@ %% integer utils -export([isize/1]). -export([irandom/1, irandom/3]). --export([random/1, random/3]). +-export([random/1]). -export([xor_bits/2, fill_bits/2]). -export([i2bin/2, bin2i/1]). @@ -401,9 +401,6 @@ xor_bits(XBits, YBits) -> irandom(Bits) -> irandom(Bits, 1, 0). -%% irandom_odd(Bits) -> -%% irandom(Bits, 1, 1). - %% %% irandom(N, Top, Bottom) %% @@ -414,57 +411,16 @@ irandom(Bits) -> %% Bot = 0 - do not set the least signifcant bit %% Bot = 1 - set the least signifcant bit (i.e always odd) %% -irandom(0, _Top, _Bottom) -> - 0; -irandom(Bits, Top, Bottom) -> - Bytes = (Bits+7) div 8, - Skip = (8-(Bits rem 8)) rem 8, - TMask = case Top of - 0 -> 0; - 1 -> 16#80; - 2 -> 16#c0 - end, - BMask = case Bottom of - 0 -> 0; - 1 -> (1 bsl Skip) - end, - <<X:Bits/big-unsigned-integer, _:Skip>> = random(Bytes, TMask, BMask), - X. +irandom(Bits, Top, Bottom) when is_integer(Top), + 0 =< Top, Top =< 2 -> + crypto:erlint(crypto:strong_rand_mpint(Bits, Top - 1, Bottom)). %% %% random/1 %% Generate N random bytes %% random(N) -> - random(N, 0, 0). - -random(N, TMask, BMask) -> - list_to_binary(rnd(N, TMask, BMask)). - -%% random/3 -%% random(Bytes, TopMask, BotMask) -%% where -%% Bytes is the number of bytes to generate -%% TopMask is bitwised or'ed to the first byte -%% BotMask is bitwised or'ed to the last byte -%% -rnd(0, _TMask, _BMask) -> - []; -rnd(1, TMask, BMask) -> - [(rand8() bor TMask) bor BMask]; -rnd(N, TMask, BMask) -> - [(rand8() bor TMask) | rnd_n(N-1, BMask)]. - -rnd_n(1, BMask) -> - [rand8() bor BMask]; -rnd_n(I, BMask) -> - [rand8() | rnd_n(I-1, BMask)]. - -rand8() -> - (rand32() bsr 8) band 16#ff. - -rand32() -> - random:uniform(16#100000000) -1. + crypto:strong_rand_bytes(N). %% %% Base 64 encode/decode |