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| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 #include "secrng.h" | |
| 6 | |
| 7 #ifdef XP_WIN | |
| 8 #include <windows.h> | |
| 9 #include <time.h> | |
| 10 | |
| 11 static BOOL | |
| 12 CurrentClockTickTime(LPDWORD lpdwHigh, LPDWORD lpdwLow) | |
| 13 { | |
| 14 LARGE_INTEGER liCount; | |
| 15 | |
| 16 if (!QueryPerformanceCounter(&liCount)) | |
| 17 return FALSE; | |
| 18 | |
| 19 *lpdwHigh = liCount.u.HighPart; | |
| 20 *lpdwLow = liCount.u.LowPart; | |
| 21 return TRUE; | |
| 22 } | |
| 23 | |
| 24 size_t RNG_GetNoise(void *buf, size_t maxbuf) | |
| 25 { | |
| 26 DWORD dwHigh, dwLow, dwVal; | |
| 27 int n = 0; | |
| 28 int nBytes; | |
| 29 time_t sTime; | |
| 30 | |
| 31 if (maxbuf <= 0) | |
| 32 return 0; | |
| 33 | |
| 34 CurrentClockTickTime(&dwHigh, &dwLow); | |
| 35 | |
| 36 // get the maximally changing bits first | |
| 37 nBytes = sizeof(dwLow) > maxbuf ? maxbuf : sizeof(dwLow); | |
| 38 memcpy((char *)buf, &dwLow, nBytes); | |
| 39 n += nBytes; | |
| 40 maxbuf -= nBytes; | |
| 41 | |
| 42 if (maxbuf <= 0) | |
| 43 return n; | |
| 44 | |
| 45 nBytes = sizeof(dwHigh) > maxbuf ? maxbuf : sizeof(dwHigh); | |
| 46 memcpy(((char *)buf) + n, &dwHigh, nBytes); | |
| 47 n += nBytes; | |
| 48 maxbuf -= nBytes; | |
| 49 | |
| 50 if (maxbuf <= 0) | |
| 51 return n; | |
| 52 | |
| 53 // get the number of milliseconds that have elapsed since Windows started | |
| 54 dwVal = GetTickCount(); | |
| 55 | |
| 56 nBytes = sizeof(dwVal) > maxbuf ? maxbuf : sizeof(dwVal); | |
| 57 memcpy(((char *)buf) + n, &dwVal, nBytes); | |
| 58 n += nBytes; | |
| 59 maxbuf -= nBytes; | |
| 60 | |
| 61 if (maxbuf <= 0) | |
| 62 return n; | |
| 63 | |
| 64 // get the time in seconds since midnight Jan 1, 1970 | |
| 65 time(&sTime); | |
| 66 nBytes = sizeof(sTime) > maxbuf ? maxbuf : sizeof(sTime); | |
| 67 memcpy(((char *)buf) + n, &sTime, nBytes); | |
| 68 n += nBytes; | |
| 69 | |
| 70 return n; | |
| 71 } | |
| 72 | |
| 73 void RNG_SystemInfoForRNG(void) | |
| 74 { | |
| 75 DWORD dwVal; | |
| 76 char buffer[256]; | |
| 77 int nBytes; | |
| 78 MEMORYSTATUS sMem; | |
| 79 HANDLE hVal; | |
| 80 DWORD dwSerialNum; | |
| 81 DWORD dwComponentLen; | |
| 82 DWORD dwSysFlags; | |
| 83 char volName[128]; | |
| 84 DWORD dwSectors, dwBytes, dwFreeClusters, dwNumClusters; | |
| 85 | |
| 86 nBytes = RNG_GetNoise(buffer, 20); // get up to 20 bytes | |
| 87 RNG_RandomUpdate(buffer, nBytes); | |
| 88 | |
| 89 sMem.dwLength = sizeof(sMem); | |
| 90 GlobalMemoryStatus(&sMem); // assorted memory stats | |
| 91 RNG_RandomUpdate(&sMem, sizeof(sMem)); | |
| 92 | |
| 93 dwVal = GetLogicalDrives(); | |
| 94 RNG_RandomUpdate(&dwVal, sizeof(dwVal)); // bitfields in bits 0-25 | |
| 95 | |
| 96 dwVal = sizeof(buffer); | |
| 97 if (GetComputerName(buffer, &dwVal)) | |
| 98 RNG_RandomUpdate(buffer, dwVal); | |
| 99 | |
| 100 hVal = GetCurrentProcess(); // 4 or 8 byte pseudo handle (a | |
| 101 // constant!) of current process | |
| 102 RNG_RandomUpdate(&hVal, sizeof(hVal)); | |
| 103 | |
| 104 dwVal = GetCurrentProcessId(); // process ID (4 bytes) | |
| 105 RNG_RandomUpdate(&dwVal, sizeof(dwVal)); | |
| 106 | |
| 107 dwVal = GetCurrentThreadId(); // thread ID (4 bytes) | |
| 108 RNG_RandomUpdate(&dwVal, sizeof(dwVal)); | |
| 109 | |
| 110 volName[0] = '\0'; | |
| 111 buffer[0] = '\0'; | |
| 112 GetVolumeInformation(NULL, | |
| 113 volName, | |
| 114 sizeof(volName), | |
| 115 &dwSerialNum, | |
| 116 &dwComponentLen, | |
| 117 &dwSysFlags, | |
| 118 buffer, | |
| 119 sizeof(buffer)); | |
| 120 | |
| 121 RNG_RandomUpdate(volName, strlen(volName)); | |
| 122 RNG_RandomUpdate(&dwSerialNum, sizeof(dwSerialNum)); | |
| 123 RNG_RandomUpdate(&dwComponentLen, sizeof(dwComponentLen)); | |
| 124 RNG_RandomUpdate(&dwSysFlags, sizeof(dwSysFlags)); | |
| 125 RNG_RandomUpdate(buffer, strlen(buffer)); | |
| 126 | |
| 127 if (GetDiskFreeSpace(NULL, &dwSectors, &dwBytes, &dwFreeClusters, | |
| 128 &dwNumClusters)) { | |
| 129 RNG_RandomUpdate(&dwSectors, sizeof(dwSectors)); | |
| 130 RNG_RandomUpdate(&dwBytes, sizeof(dwBytes)); | |
| 131 RNG_RandomUpdate(&dwFreeClusters, sizeof(dwFreeClusters)); | |
| 132 RNG_RandomUpdate(&dwNumClusters, sizeof(dwNumClusters)); | |
| 133 } | |
| 134 | |
| 135 nBytes = RNG_GetNoise(buffer, 20); // get up to 20 bytes | |
| 136 RNG_RandomUpdate(buffer, nBytes); | |
| 137 } | |
| 138 | |
| 139 | |
| 140 /* | |
| 141 * The RtlGenRandom function is declared in <ntsecapi.h>, but the | |
| 142 * declaration is missing a calling convention specifier. So we | |
| 143 * declare it manually here. | |
| 144 */ | |
| 145 #define RtlGenRandom SystemFunction036 | |
| 146 DECLSPEC_IMPORT BOOLEAN WINAPI RtlGenRandom( | |
| 147 PVOID RandomBuffer, | |
| 148 ULONG RandomBufferLength); | |
| 149 | |
| 150 size_t RNG_SystemRNG(void *dest, size_t maxLen) | |
| 151 { | |
| 152 size_t bytes = 0; | |
| 153 | |
| 154 if (RtlGenRandom(dest, maxLen)) { | |
| 155 bytes = maxLen; | |
| 156 } | |
| 157 return bytes; | |
| 158 } | |
| 159 #endif /* is XP_WIN */ | |
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Chromium Code Reviews
Issue 2078763002:
Delete bundled copy of NSS and replace with README. (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/nss@master