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46 lines
1.4 KiB
C++
46 lines
1.4 KiB
C++
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/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2014.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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random.cpp
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Kernel entropy gathering.
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*******************************************************************************/
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#include <errno.h>
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#include <sortix/kernel/copy.h>
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#include <sortix/kernel/syscall.h>
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namespace Sortix {
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int sys_getentropy(void* user_buffer, size_t size)
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{
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unsigned char buffer[256];
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if ( sizeof(buffer) < size )
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return errno = EIO, -1;
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// TODO: SECURITY: We need to actually gather entropy and deliver it.
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for ( size_t i = 0; i < size; i++ )
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buffer[i] = i;
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if ( !CopyToUser(user_buffer, buffer, size) )
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return -1;
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return 0;
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}
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} // namespace Sortix
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