1 //******************************************************************
3 // Copyright 2014 Intel Mobile Communications GmbH All Rights Reserved.
5 //-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
7 // Licensed under the Apache License, Version 2.0 (the "License");
8 // you may not use this file except in compliance with the License.
9 // You may obtain a copy of the License at
11 // http://www.apache.org/licenses/LICENSE-2.0
13 // Unless required by applicable law or agreed to in writing, software
14 // distributed under the License is distributed on an "AS IS" BASIS,
15 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 // See the License for the specific language governing permissions and
17 // limitations under the License.
19 //-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
21 // Defining _POSIX_C_SOURCE macro with 199309L (or greater) as value
22 // causes header files to expose definitions
23 // corresponding to the POSIX.1b, Real-time extensions
24 // (IEEE Std 1003.1b-1993) specification
26 // For this specific file, see use of clock_gettime,
27 // Refer to http://pubs.opengroup.org/stage7tc1/functions/clock_gettime.html
28 // and to http://man7.org/linux/man-pages/man2/clock_gettime.2.html
29 #ifndef _POSIX_C_SOURCE
30 #define _POSIX_C_SOURCE 200809L
33 #include "platform_features.h"
43 #ifdef HAVE_SYS_TIME_H
49 #if defined(__ANDROID__)
51 #include <linux/time.h>
59 #ifdef HAVE_UUID_UUID_H
60 #include <uuid/uuid.h>
63 #define NANO_SEC 1000000000
68 // ARM GCC compiler doesnt define srandom function.
69 #if defined(ARDUINO) && !defined(ARDUINO_ARCH_SAM)
70 #define HAVE_SRANDOM 1
73 uint8_t GetRandomBitRaw()
75 return analogRead((uint8_t)ANALOG_IN) & 0x1;
78 uint8_t GetRandomBitRaw2()
83 a = GetRandomBitRaw() | (GetRandomBitRaw()<<1);
86 return 0; // 1 to 0 transition: log a zero bit
90 return 1;// 0 to 1 transition: log a one bit
92 // For other cases, try again.
96 uint8_t GetRandomBit()
101 a = GetRandomBitRaw2() | (GetRandomBitRaw2()<<1);
104 return 0; // 1 to 0 transition: log a zero bit
108 return 1;// 0 to 1 transition: log a one bit
110 // For other cases, try again.
115 int8_t OCSeedRandom()
118 // Get current time to Seed.
119 uint64_t currentTime = 0;
121 struct timespec getTs;
122 clock_gettime(CLOCK_MONOTONIC, &getTs);
123 currentTime = (getTs.tv_sec * (uint64_t)NANO_SEC + getTs.tv_nsec)/1000;
126 if (QueryPerformanceCounter(&count)) {
127 currentTime = count.QuadPart;
129 #elif _POSIX_TIMERS > 0
131 clock_gettime(CLOCK_MONOTONIC, &ts);
132 currentTime = (ts.tv_sec * (uint64_t)NANO_SEC + ts.tv_nsec)/ 1000;
135 gettimeofday(&tv, NULL);
136 currentTime = tv.tv_sec * (uint64_t)1000000 + tv.tv_usec;
138 #if defined(__unix__) || defined(__APPLE__)
139 int32_t fd = open("/dev/urandom", O_RDONLY);
142 uint32_t randomSeed = 0;
143 uint32_t totalRead = 0; //how many integers were read
144 int32_t currentRead = 0;
145 while (totalRead < sizeof(randomSeed))
147 currentRead = read(fd, (uint8_t*) &randomSeed + totalRead,
148 sizeof(randomSeed) - totalRead);
151 totalRead += currentRead;
155 srand(randomSeed | currentTime);
160 // Do time based seed when problem in accessing "/dev/urandom"
165 #elif defined ARDUINO
170 result += result + GetRandomBit();
182 void OCFillRandomMem(uint8_t * location, uint16_t len)
190 *location++ = OCGetRandomByte();
194 uint32_t OCGetRandom()
197 OCFillRandomMem((uint8_t*) &result, 4);
201 uint8_t OCGetRandomByte(void)
204 return random() & 0x00FF;
206 return rand() & 0x00FF;
210 uint32_t OCGetRandomRange(uint32_t firstBound, uint32_t secondBound)
215 if (firstBound > secondBound)
218 diff = firstBound - secondBound;
220 else if (firstBound < secondBound)
223 diff = secondBound - firstBound;
229 result = ((float)OCGetRandom()/((float)(0xFFFFFFFF))*(float)diff) + (float) base;
233 #if defined(__ANDROID__)
234 uint8_t parseUuidChar(char c)
245 uint8_t parseUuidPart(const char *c)
247 return (parseUuidChar(c[0])<<4) + parseUuidChar(c[1]);
251 OCRandomUuidResult OCGenerateUuid(uint8_t uuid[UUID_SIZE])
255 return RAND_UUID_INVALID_PARAM;
257 #if defined(__ANDROID__)
258 char uuidString[UUID_STRING_SIZE];
259 int8_t ret = OCGenerateUuidString(uuidString);
266 uuid[ 0] = parseUuidPart(&uuidString[0]);
267 uuid[ 1] = parseUuidPart(&uuidString[2]);
268 uuid[ 2] = parseUuidPart(&uuidString[4]);
269 uuid[ 3] = parseUuidPart(&uuidString[6]);
271 uuid[ 4] = parseUuidPart(&uuidString[9]);
272 uuid[ 5] = parseUuidPart(&uuidString[11]);
274 uuid[ 6] = parseUuidPart(&uuidString[14]);
275 uuid[ 7] = parseUuidPart(&uuidString[16]);
277 uuid[ 8] = parseUuidPart(&uuidString[19]);
278 uuid[ 9] = parseUuidPart(&uuidString[21]);
280 uuid[10] = parseUuidPart(&uuidString[24]);
281 uuid[11] = parseUuidPart(&uuidString[26]);
282 uuid[12] = parseUuidPart(&uuidString[28]);
283 uuid[13] = parseUuidPart(&uuidString[30]);
284 uuid[14] = parseUuidPart(&uuidString[32]);
285 uuid[15] = parseUuidPart(&uuidString[34]);
288 #elif defined(HAVE_UUID_UUID_H)
289 // note: uuid_t is typedefed as unsigned char[16] on linux/apple
293 // Fallback for all platforms is filling the array with random data
294 OCFillRandomMem(uuid, UUID_SIZE);
299 OCRandomUuidResult OCGenerateUuidString(char uuidString[UUID_STRING_SIZE])
303 return RAND_UUID_INVALID_PARAM;
305 #if defined(__ANDROID__)
306 int32_t fd = open("/proc/sys/kernel/random/uuid", O_RDONLY);
309 ssize_t readResult = read(fd, uuidString, UUID_STRING_SIZE - 1);
313 return RAND_UUID_READ_ERROR;
315 else if (readResult < UUID_STRING_SIZE - 1)
317 uuidString[0] = '\0';
318 return RAND_UUID_READ_ERROR;
321 uuidString[UUID_STRING_SIZE - 1] = '\0';
322 for (char* p = uuidString; *p; ++p)
331 return RAND_UUID_READ_ERROR;
333 #elif defined(HAVE_UUID_UUID_H)
334 uint8_t uuid[UUID_SIZE];
335 int8_t ret = OCGenerateUuid(uuid);
342 uuid_unparse_lower(uuid, uuidString);
346 uint8_t uuid[UUID_SIZE];
347 OCGenerateUuid(uuid);
349 return OCConvertUuidToString(uuid, uuidString);
353 OCRandomUuidResult OCConvertUuidToString(const uint8_t uuid[UUID_SIZE],
354 char uuidString[UUID_STRING_SIZE])
356 if (uuid == NULL || uuidString == NULL)
358 return RAND_UUID_INVALID_PARAM;
362 int ret = snprintf(uuidString, UUID_STRING_SIZE,
363 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
364 uuid[0], uuid[1], uuid[2], uuid[3],
365 uuid[4], uuid[5], uuid[6], uuid[7],
366 uuid[8], uuid[9], uuid[10], uuid[11],
367 uuid[12], uuid[13], uuid[14], uuid[15]
370 if (ret != UUID_STRING_SIZE - 1)
372 return RAND_UUID_CONVERT_ERROR;