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@ -21,71 +21,42 @@
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdio.h>
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#ifdef _WIN32
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#include <time.h>
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#else
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#include <assert.h>
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#endif
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#include "rand.h"
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#ifndef RAND_PLATFORM_INDEPENDANT
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static FILE *frand = NULL;
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#ifndef RAND_PLATFORM_INDEPENDENT
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int finalize_rand(void)
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{
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#include <stdio.h>
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#ifdef _WIN32
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return 0;
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#include <time.h>
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#else
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if (!frand) return 0;
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int err = fclose(frand);
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frand = NULL;
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return err;
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#include <assert.h>
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#endif
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}
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uint32_t random32(void)
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{
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#ifdef _WIN32
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srand((unsigned)time(NULL));
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static int initialized = 0;
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if (!initialized) {
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srand((unsigned)time(NULL));
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initialized = 1;
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}
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return ((rand() % 0xFF) | ((rand() % 0xFF) << 8) | ((rand() % 0xFF) << 16) | ((rand() % 0xFF) << 24));
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#else
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uint32_t r;
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size_t len = sizeof(r);
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static FILE *frand = NULL;
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if (!frand) {
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frand = fopen("/dev/urandom", "r");
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}
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size_t len_read = fread(&r, 1, len, frand);
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(void)len_read;
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assert(len_read == len);
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uint32_t r;
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size_t len_read = fread(&r, 1, sizeof(r), frand);
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assert(len_read == sizeof(r));
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return r;
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#endif
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}
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void random_buffer(uint8_t *buf, size_t len)
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{
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#ifdef _WIN32
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srand((unsigned)time(NULL));
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size_t i;
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for (i = 0; i < len; i++) {
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buf[i] = rand() % 0xFF;
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}
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#else
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if (!frand) {
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frand = fopen("/dev/urandom", "r");
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}
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size_t len_read = fread(buf, 1, len, frand);
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(void)len_read;
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assert(len_read == len);
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#endif
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}
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#endif /* RAND_PLATFORM_INDEPENDANT */
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#endif /* RAND_PLATFORM_INDEPENDENT */
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//
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// Following code should be platform independant
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// The following code is platform independent
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//
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uint32_t random_uniform(uint32_t n)
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@ -95,13 +66,22 @@ uint32_t random_uniform(uint32_t n)
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return x / (max / n);
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}
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void random_buffer(uint8_t *buf, size_t len)
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{
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uint32_t r = 0;
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for (size_t i = 0; i < len; i++) {
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if (i % 4 == 0) {
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r = random32();
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}
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buf[i] = (r >> ((i % 4) * 8)) & 0xFF;
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}
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}
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void random_permute(char *str, size_t len)
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{
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int i, j;
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char t;
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for (i = len - 1; i >= 1; i--) {
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j = random_uniform(i + 1);
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t = str[j];
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for (int i = len - 1; i >= 1; i--) {
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int j = random_uniform(i + 1);
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char t = str[j];
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str[j] = str[i];
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str[i] = t;
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}
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