54 line
978 B
C
54 line
978 B
C
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#ifndef RANDOM_H
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#define RANDOM_H
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#include <unistd.h>
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#include <sys/syscall.h>
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#ifdef __linux__
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#include <linux/random.h>
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#endif
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#ifndef SYS_getrandom
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#include <openssl/rand.h>
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <string>
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// dirty hacks
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#ifdef SYS_getrandom
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inline int getrandom(void *buf, size_t buflen, unsigned int flags)
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{
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return syscall(SYS_getrandom, buf, buflen, flags);
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}
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#else
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#if __linux__
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// ancient linux systems
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#define GRND_NONBLOCK 0
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inline int getrandom(void *buf, size_t buflen, unsigned int flags)
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{
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int result = RAND_bytes(buf, buflen);
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if(result == 1)
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{
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return (int)buflen;
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}
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return -1;
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}
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#endif
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#if __OpenBSD__
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inline int getrandom(void *buf, size_t buflen, unsigned int flags)
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{
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arc4random_buf(buf, buflen);
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return 0;
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}
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#endif
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#endif
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/* TODO: if the >=C++11 prngr are good enough, use them */
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class Random
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{
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public:
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Random();
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std::string getRandomHexString(unsigned int bytes);
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};
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#endif // RANDOM_H
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