mirror of
https://github.com/RfidResearchGroup/proxmark3.git
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d19754567d
* .h include only the strict minimum for their own parsing * this forces all files to include explicitment their needs and not count on far streched dependencies * this helps Makefile to rebuild only the minimum * according to this rule, most standalone .h are now gone * big app.h is gone * remove seldom __cplusplus, if c++ happens, everything will have to be done properly anyway * all unrequired include were removed * split common/ into common/ (client+arm) and common_arm/ (os+bootloader) * bring zlib to common/ * bring stuff not really/not yet used in common back to armsrc/ or client/ * bring liblua into client/ * bring uart into client/ * move some portions of code around (dbprint, protocols,...) * rename unused files into *_disabled.[ch] to make it explicit * rename soft Uarts between 14a, 14b and iclass, so a standalone could use several without clash * remove PrintAndLogDevice * move deprecated-hid-flasher from client to tools * Makefiles * treat deps in armsrc/ as in client/ * client: stop on warning (-Werror), same as for armsrc/ Tested on: * all standalone modes * Linux
40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// Burtle Prng - Modified. 42iterations instead of 20.
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// ref: http://burtleburtle.net/bob/rand/smallprng.html
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//-----------------------------------------------------------------------------
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#include "prng.h"
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#define rot(x,k) (((x)<<(k))|((x)>>(32-(k))))
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uint32_t burtle_get_mod(prng_ctx *x) {
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uint32_t e = x->a - rot(x->b, 21);
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x->a = x->b ^ rot(x->c, 19);
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x->b = x->c + rot(x->d, 6);
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x->c = x->d + e;
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x->d = e + x->a;
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return x->d;
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}
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void burtle_init_mod(prng_ctx *x, uint32_t seed) {
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x->a = 0xf1ea5eed;
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x->b = x->c = x->d = seed;
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for (uint8_t i = 0; i < 42; ++i) {
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(void)burtle_get_mod(x);
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}
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}
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void burtle_init(prng_ctx *x, uint32_t seed) {
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uint32_t i;
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x->a = 0xf1ea5eed, x->b = x->c = x->d = seed;
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for (i = 0; i < 20; ++i) {
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(void)burtle_get_mod(x);
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}
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}
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uint32_t GetSimplePrng(uint32_t seed) {
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seed *= 0x19660D;
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seed += 0x3C6EF35F;
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return seed;
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}
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