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 "iotivity_config.h"
44 #ifdef HAVE_SYS_TIME_H
50 #if defined(__ANDROID__)
52 #include <linux/time.h>
60 #ifdef HAVE_UUID_UUID_H
61 #include <uuid/uuid.h>
64 #define NANO_SEC 1000000000
69 // ARM GCC compiler doesnt define srandom function.
70 #if defined(ARDUINO) && !defined(ARDUINO_ARCH_SAM)
71 #define HAVE_SRANDOM 1
74 uint8_t GetRandomBitRaw()
76 return analogRead((uint8_t)ANALOG_IN) & 0x1;
79 uint8_t GetRandomBitRaw2()
84 a = GetRandomBitRaw() | (GetRandomBitRaw()<<1);
87 return 0; // 1 to 0 transition: log a zero bit
91 return 1;// 0 to 1 transition: log a one bit
93 // For other cases, try again.
97 uint8_t GetRandomBit()
102 a = GetRandomBitRaw2() | (GetRandomBitRaw2()<<1);
105 return 0; // 1 to 0 transition: log a zero bit
109 return 1;// 0 to 1 transition: log a one bit
111 // For other cases, try again.
116 int8_t OCSeedRandom()
119 // Get current time to Seed.
120 uint64_t currentTime = 0;
122 struct timespec getTs;
123 clock_gettime(CLOCK_MONOTONIC, &getTs);
124 currentTime = (getTs.tv_sec * (uint64_t)NANO_SEC + getTs.tv_nsec)/1000;
127 if (QueryPerformanceCounter(&count)) {
128 currentTime = count.QuadPart;
130 #elif _POSIX_TIMERS > 0
132 clock_gettime(CLOCK_MONOTONIC, &ts);
133 currentTime = (ts.tv_sec * (uint64_t)NANO_SEC + ts.tv_nsec)/ 1000;
136 gettimeofday(&tv, NULL);
137 currentTime = tv.tv_sec * (uint64_t)1000000 + tv.tv_usec;
139 #if defined(__unix__) || defined(__APPLE__)
140 int32_t fd = open("/dev/urandom", O_RDONLY);
143 uint32_t randomSeed = 0;
144 uint32_t totalRead = 0; //how many integers were read
145 int32_t currentRead = 0;
146 while (totalRead < sizeof(randomSeed))
148 currentRead = read(fd, (uint8_t*) &randomSeed + totalRead,
149 sizeof(randomSeed) - totalRead);
152 totalRead += currentRead;
156 srand(randomSeed | currentTime);
161 // Do time based seed when problem in accessing "/dev/urandom"
166 #elif defined ARDUINO
171 result += result + GetRandomBit();
183 void OCFillRandomMem(uint8_t * location, uint16_t len)
191 *location++ = OCGetRandomByte();
195 uint32_t OCGetRandom()
198 OCFillRandomMem((uint8_t*) &result, 4);
202 uint8_t OCGetRandomByte(void)
205 return random() & 0x00FF;
207 return rand() & 0x00FF;
211 uint32_t OCGetRandomRange(uint32_t firstBound, uint32_t secondBound)
216 if (firstBound > secondBound)
219 diff = firstBound - secondBound;
221 else if (firstBound < secondBound)
224 diff = secondBound - firstBound;
230 result = ((float)OCGetRandom()/((float)(0xFFFFFFFF))*(float)diff) + (float) base;
234 #if defined(__ANDROID__)
235 uint8_t parseUuidChar(char c)
246 uint8_t parseUuidPart(const char *c)
248 return (parseUuidChar(c[0])<<4) + parseUuidChar(c[1]);
252 OCRandomUuidResult OCGenerateUuid(uint8_t uuid[UUID_SIZE])
256 return RAND_UUID_INVALID_PARAM;
258 #if defined(__ANDROID__)
259 char uuidString[UUID_STRING_SIZE];
260 int8_t ret = OCGenerateUuidString(uuidString);
267 uuid[ 0] = parseUuidPart(&uuidString[0]);
268 uuid[ 1] = parseUuidPart(&uuidString[2]);
269 uuid[ 2] = parseUuidPart(&uuidString[4]);
270 uuid[ 3] = parseUuidPart(&uuidString[6]);
272 uuid[ 4] = parseUuidPart(&uuidString[9]);
273 uuid[ 5] = parseUuidPart(&uuidString[11]);
275 uuid[ 6] = parseUuidPart(&uuidString[14]);
276 uuid[ 7] = parseUuidPart(&uuidString[16]);
278 uuid[ 8] = parseUuidPart(&uuidString[19]);
279 uuid[ 9] = parseUuidPart(&uuidString[21]);
281 uuid[10] = parseUuidPart(&uuidString[24]);
282 uuid[11] = parseUuidPart(&uuidString[26]);
283 uuid[12] = parseUuidPart(&uuidString[28]);
284 uuid[13] = parseUuidPart(&uuidString[30]);
285 uuid[14] = parseUuidPart(&uuidString[32]);
286 uuid[15] = parseUuidPart(&uuidString[34]);
289 #elif defined(HAVE_UUID_UUID_H)
290 // note: uuid_t is typedefed as unsigned char[16] on linux/apple
294 // Fallback for all platforms is filling the array with random data
295 OCFillRandomMem(uuid, UUID_SIZE);
300 OCRandomUuidResult OCGenerateUuidString(char uuidString[UUID_STRING_SIZE])
304 return RAND_UUID_INVALID_PARAM;
306 #if defined(__ANDROID__)
307 int32_t fd = open("/proc/sys/kernel/random/uuid", O_RDONLY);
310 ssize_t readResult = read(fd, uuidString, UUID_STRING_SIZE - 1);
314 return RAND_UUID_READ_ERROR;
316 else if (readResult < UUID_STRING_SIZE - 1)
318 uuidString[0] = '\0';
319 return RAND_UUID_READ_ERROR;
322 uuidString[UUID_STRING_SIZE - 1] = '\0';
323 for (char* p = uuidString; *p; ++p)
332 return RAND_UUID_READ_ERROR;
334 #elif defined(HAVE_UUID_UUID_H)
335 uint8_t uuid[UUID_SIZE];
336 int8_t ret = OCGenerateUuid(uuid);
343 uuid_unparse_lower(uuid, uuidString);
347 uint8_t uuid[UUID_SIZE];
348 OCGenerateUuid(uuid);
350 return OCConvertUuidToString(uuid, uuidString);
354 OCRandomUuidResult OCConvertUuidToString(const uint8_t uuid[UUID_SIZE],
355 char uuidString[UUID_STRING_SIZE])
357 if (uuid == NULL || uuidString == NULL)
359 return RAND_UUID_INVALID_PARAM;
363 int ret = snprintf(uuidString, UUID_STRING_SIZE,
364 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
365 uuid[0], uuid[1], uuid[2], uuid[3],
366 uuid[4], uuid[5], uuid[6], uuid[7],
367 uuid[8], uuid[9], uuid[10], uuid[11],
368 uuid[12], uuid[13], uuid[14], uuid[15]
371 if (ret != UUID_STRING_SIZE - 1)
373 return RAND_UUID_CONVERT_ERROR;