120 lines
2.5 KiB
C++
120 lines
2.5 KiB
C++
/*
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* Noise generation for PuTTY's cryptographic random number
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* generator.
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*/
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#include "global.h"
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#if defined(WIN32)
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#define _WIN32_WINNT 0x0400 // VC6 header needs this defined.
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#include <windows.h>
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#include <wincrypt.h>
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/*
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* This function is called once, at PuTTY startup, and will do some
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* seriously silly things like listing directories and getting disk
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* free space and a process snapshot.
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*/
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void noise_get_heavy(void (*func) (void *, int))
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{
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static HCRYPTPROV hProv = NULL;
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if( hProv == NULL )
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{
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if( !CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT) )
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RageException::Throw( "CryptAcquireContext" );
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}
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char buf[2048];
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if ( !CryptGenRandom(hProv, sizeof(buf), (BYTE*) buf) )
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RageException::Throw( "CryptGenRandom" );
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func( buf, sizeof(buf) );
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}
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/*
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* This function is called every time the random pool needs
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* stirring, and will acquire the system time in all available
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* forms and the battery status.
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*/
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void noise_get_light(void (*func) (void *, int))
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{
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SYSTEMTIME systime;
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DWORD adjust[2];
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BOOL rubbish;
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GetSystemTime(&systime);
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func(&systime, sizeof(systime));
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GetSystemTimeAdjustment(&adjust[0], &adjust[1], &rubbish);
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func(&adjust, sizeof(adjust));
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}
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#else
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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static int read_dev_urandom(char *buf, int len)
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{
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int fd;
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int ngot, ret;
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fd = open("/dev/urandom", O_RDONLY);
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if (fd < 0)
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return 0;
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ngot = 0;
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while (ngot < len)
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{
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ret = read(fd, buf+ngot, len-ngot);
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if (ret < 0) {
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close(fd);
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return 0;
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}
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ngot += ret;
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}
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return 1;
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}
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/*
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* This function is called once, at PuTTY startup. It will do some
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* slightly silly things such as fetching an entire process listing
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* and scanning /tmp, load the saved random seed from disk, and
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* also read 32 bytes out of /dev/urandom.
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*/
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void noise_get_heavy(void (*func) (void *, int))
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{
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char buf[512];
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FILE *fp;
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int ret;
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if (read_dev_urandom(buf, 32))
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func(buf, 32);
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fp = popen("ps -axu 2>/dev/null", "r");
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while ( (ret = fread(buf, 1, sizeof(buf), fp)) > 0)
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func(buf, ret);
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pclose(fp);
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fp = popen("ls -al /tmp 2>/dev/null", "r");
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while ( (ret = fread(buf, 1, sizeof(buf), fp)) > 0)
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func(buf, ret);
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pclose(fp);
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}
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/*
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* This function is called every time the random pool needs
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* stirring, and will acquire the system time.
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*/
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void noise_get_light(void (*func) (void *, int))
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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func(&tv, sizeof(tv));
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}
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#endif
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