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 #if defined(__ANDROID__) || defined(__linux__) || defined(__APPLE__)
39 #if defined(__ANDROID__)
40 #include <linux/time.h>
46 #if !defined(__ANDROID__) && (defined(__linux__) || defined(__APPLE__))
47 #include <uuid/uuid.h>
53 // ARM GCC compiler doesnt define srandom function.
54 #if defined(ARDUINO) && !defined(ARDUINO_ARCH_SAM)
55 #define HAVE_SRANDOM 1
58 uint8_t GetRandomBitRaw()
60 return analogRead((uint8_t)ANALOG_IN) & 0x1;
63 uint8_t GetRandomBitRaw2()
68 a = GetRandomBitRaw() | (GetRandomBitRaw()<<1);
71 return 0; // 1 to 0 transition: log a zero bit
75 return 1;// 0 to 1 transition: log a one bit
77 // For other cases, try again.
81 uint8_t GetRandomBit()
86 a = GetRandomBitRaw2() | (GetRandomBitRaw2()<<1);
89 return 0; // 1 to 0 transition: log a zero bit
93 return 1;// 0 to 1 transition: log a one bit
95 // For other cases, try again.
100 int8_t OCSeedRandom()
102 #if defined(__ANDROID__) || defined(__linux__) || defined(__APPLE__) || defined(__TIZEN__)
103 // Get current time to Seed.
104 uint64_t currentTime = 0;
106 struct timespec getTs;
107 clock_gettime(CLOCK_MONOTONIC, &getTs);
108 currentTime = (getTs.tv_sec * (uint64_t)1000000000 + getTs.tv_nsec)/1000;
109 #elif _POSIX_TIMERS > 0
111 clock_gettime(CLOCK_MONOTONIC, &ts);
112 currentTime = ts.tv_sec * 1000000 + ts.tv_nsec / 1000;
115 gettimeofday(&tv, NULL);
116 currentTime = tv.tv_sec * 1000000 + tv.tv_usec;
119 int32_t fd = open("/dev/urandom", O_RDONLY);
122 uint32_t randomSeed = 0;
123 uint32_t totalRead = 0; //how many integers were read
124 int32_t currentRead = 0;
125 while (totalRead < sizeof(randomSeed))
127 currentRead = read(fd, (uint8_t*) &randomSeed + totalRead,
128 sizeof(randomSeed) - totalRead);
131 totalRead += currentRead;
135 srand(randomSeed | currentTime);
139 // Do time based seed when problem in accessing "/dev/urandom"
144 #elif defined ARDUINO
149 result += result + GetRandomBit();
161 void OCFillRandomMem(uint8_t * location, uint16_t len)
169 *location++ = OCGetRandomByte();
173 uint32_t OCGetRandom()
176 OCFillRandomMem((uint8_t*) &result, 4);
180 uint8_t OCGetRandomByte(void)
182 #if defined(__ANDROID__) || defined(__linux__) || defined(__APPLE__)
183 return rand() & 0x00FF;
184 #elif defined ARDUINO
186 return random() & 0x00FF;
188 return rand() & 0x00FF;
193 uint32_t OCGetRandomRange(uint32_t firstBound, uint32_t secondBound)
198 if (firstBound > secondBound)
201 diff = firstBound - secondBound;
203 else if (firstBound < secondBound)
206 diff = secondBound - firstBound;
212 result = ((float)OCGetRandom()/((float)(0xFFFFFFFF))*(float)diff) + (float) base;
216 #if defined(__ANDROID__)
217 uint8_t parseUuidChar(char c)
228 uint8_t parseUuidPart(const char *c)
230 return (parseUuidChar(c[0])<<4) + parseUuidChar(c[1]);
234 OCRandomUuidResult OCGenerateUuid(uint8_t uuid[UUID_SIZE])
238 return RAND_UUID_INVALID_PARAM;
240 #if defined(__ANDROID__)
241 char uuidString[UUID_STRING_SIZE];
242 int8_t ret = OCGenerateUuidString(uuidString);
249 uuid[ 0] = parseUuidPart(&uuidString[0]);
250 uuid[ 1] = parseUuidPart(&uuidString[2]);
251 uuid[ 2] = parseUuidPart(&uuidString[4]);
252 uuid[ 3] = parseUuidPart(&uuidString[6]);
254 uuid[ 4] = parseUuidPart(&uuidString[9]);
255 uuid[ 5] = parseUuidPart(&uuidString[11]);
257 uuid[ 6] = parseUuidPart(&uuidString[14]);
258 uuid[ 7] = parseUuidPart(&uuidString[16]);
260 uuid[ 8] = parseUuidPart(&uuidString[19]);
261 uuid[ 9] = parseUuidPart(&uuidString[21]);
263 uuid[10] = parseUuidPart(&uuidString[24]);
264 uuid[11] = parseUuidPart(&uuidString[26]);
265 uuid[12] = parseUuidPart(&uuidString[28]);
266 uuid[13] = parseUuidPart(&uuidString[30]);
267 uuid[14] = parseUuidPart(&uuidString[32]);
268 uuid[15] = parseUuidPart(&uuidString[34]);
271 #elif !defined(__ANDROID__) && (defined(__linux__) || defined(__APPLE__))
272 // note: uuid_t is typedefed as unsigned char[16] on linux/apple
276 // Fallback for all platforms is filling the array with random data
277 OCFillRandomMem(uuid, UUID_SIZE);
282 OCRandomUuidResult OCGenerateUuidString(char uuidString[UUID_STRING_SIZE])
286 return RAND_UUID_INVALID_PARAM;
288 #if defined(__ANDROID__)
289 int32_t fd = open("/proc/sys/kernel/random/uuid", O_RDONLY);
292 ssize_t readResult = read(fd, uuidString, UUID_STRING_SIZE - 1);
296 return RAND_UUID_READ_ERROR;
298 else if (readResult < UUID_STRING_SIZE - 1)
300 uuidString[0] = '\0';
301 return RAND_UUID_READ_ERROR;
304 uuidString[UUID_STRING_SIZE - 1] = '\0';
305 for (char* p = uuidString; *p; ++p)
314 return RAND_UUID_READ_ERROR;
316 #elif !defined(__ANDROID__) && (defined(__linux__) || defined(__APPLE__))
317 uint8_t uuid[UUID_SIZE];
318 int8_t ret = OCGenerateUuid(uuid);
325 uuid_unparse_lower(uuid, uuidString);
329 uint8_t uuid[UUID_SIZE];
330 OCGenerateUuid(uuid);
332 return OCConvertUuidToString(uuid, uuidString);
336 OCRandomUuidResult OCConvertUuidToString(const uint8_t uuid[UUID_SIZE],
337 char uuidString[UUID_STRING_SIZE])
339 if (uuid == NULL || uuidString == NULL)
341 return RAND_UUID_INVALID_PARAM;
345 int ret = snprintf(uuidString, UUID_STRING_SIZE,
346 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
347 uuid[0], uuid[1], uuid[2], uuid[3],
348 uuid[4], uuid[5], uuid[6], uuid[7],
349 uuid[8], uuid[9], uuid[10], uuid[11],
350 uuid[12], uuid[13], uuid[14], uuid[15]
353 if (ret != UUID_STRING_SIZE - 1)
355 return RAND_UUID_CONVERT_ERROR;