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 uint8_t GetRandomBitRaw()
55 return analogRead((uint8_t)ANALOG_IN) & 0x1;
58 uint8_t GetRandomBitRaw2()
63 a = GetRandomBitRaw() | (GetRandomBitRaw()<<1);
66 return 0; // 1 to 0 transition: log a zero bit
70 return 1;// 0 to 1 transition: log a one bit
72 // For other cases, try again.
76 uint8_t GetRandomBit()
81 a = GetRandomBitRaw2() | (GetRandomBitRaw2()<<1);
84 return 0; // 1 to 0 transition: log a zero bit
88 return 1;// 0 to 1 transition: log a one bit
90 // For other cases, try again.
97 #if defined(__ANDROID__) || defined(__linux__) || defined(__APPLE__) || defined(__TIZEN__)
98 // Get current time to Seed.
99 uint64_t currentTime = 0;
101 struct timespec getTs;
102 clock_gettime(CLOCK_MONOTONIC, &getTs);
103 currentTime = (getTs.tv_sec * (uint64_t)1000000000 + getTs.tv_nsec)/1000;
104 #elif _POSIX_TIMERS > 0
106 clock_gettime(CLOCK_MONOTONIC, &ts);
107 currentTime = ts.tv_sec * 1000000 + ts.tv_nsec / 1000;
110 gettimeofday(&tv, NULL);
111 currentTime = tv.tv_sec * 1000000 + tv.tv_usec;
114 int32_t fd = open("/dev/urandom", O_RDONLY);
117 uint32_t randomSeed = 0;
118 uint32_t totalRead = 0; //how many integers were read
119 int32_t currentRead = 0;
120 while (totalRead < sizeof(randomSeed))
122 currentRead = read(fd, (uint8_t*) &randomSeed + totalRead,
123 sizeof(randomSeed) - totalRead);
126 totalRead += currentRead;
130 srand(randomSeed | currentTime);
134 // Do time based seed when problem in accessing "/dev/urandom"
139 #elif defined ARDUINO
144 result += result + GetRandomBit();
152 void OCFillRandomMem(uint8_t * location, uint16_t len)
160 *location++ = OCGetRandomByte();
164 uint32_t OCGetRandom()
167 OCFillRandomMem((uint8_t*) &result, 4);
171 uint8_t OCGetRandomByte(void)
173 #if defined(__ANDROID__) || defined(__linux__) || defined(__APPLE__)
174 return rand() & 0x00FF;
175 #elif defined ARDUINO
176 return random() & 0x00FF;
180 uint32_t OCGetRandomRange(uint32_t firstBound, uint32_t secondBound)
185 if (firstBound > secondBound)
188 diff = firstBound - secondBound;
190 else if (firstBound < secondBound)
193 diff = secondBound - firstBound;
199 result = ((float)OCGetRandom()/((float)(0xFFFFFFFF))*(float)diff) + (float) base;
203 #if defined(__ANDROID__)
204 uint8_t parseUuidChar(char c)
215 uint8_t parseUuidPart(const char *c)
217 return (parseUuidChar(c[0])<<4) + parseUuidChar(c[1]);
221 OCRandomUuidResult OCGenerateUuid(uint8_t uuid[UUID_SIZE])
225 return RAND_UUID_INVALID_PARAM;
227 #if defined(__ANDROID__)
228 char uuidString[UUID_STRING_SIZE];
229 int8_t ret = OCGenerateUuidString(uuidString);
236 uuid[ 0] = parseUuidPart(&uuidString[0]);
237 uuid[ 1] = parseUuidPart(&uuidString[2]);
238 uuid[ 2] = parseUuidPart(&uuidString[4]);
239 uuid[ 3] = parseUuidPart(&uuidString[6]);
241 uuid[ 4] = parseUuidPart(&uuidString[9]);
242 uuid[ 5] = parseUuidPart(&uuidString[11]);
244 uuid[ 6] = parseUuidPart(&uuidString[14]);
245 uuid[ 7] = parseUuidPart(&uuidString[16]);
247 uuid[ 8] = parseUuidPart(&uuidString[19]);
248 uuid[ 9] = parseUuidPart(&uuidString[21]);
250 uuid[10] = parseUuidPart(&uuidString[24]);
251 uuid[11] = parseUuidPart(&uuidString[26]);
252 uuid[12] = parseUuidPart(&uuidString[28]);
253 uuid[13] = parseUuidPart(&uuidString[30]);
254 uuid[14] = parseUuidPart(&uuidString[32]);
255 uuid[15] = parseUuidPart(&uuidString[34]);
258 #elif !defined(__ANDROID__) && (defined(__linux__) || defined(__APPLE__))
259 // note: uuid_t is typedefed as unsigned char[16] on linux/apple
263 // Fallback for all platforms is filling the array with random data
264 OCFillRandomMem(uuid, UUID_SIZE);
269 OCRandomUuidResult OCGenerateUuidString(char uuidString[UUID_STRING_SIZE])
273 return RAND_UUID_INVALID_PARAM;
275 #if defined(__ANDROID__)
276 int32_t fd = open("/proc/sys/kernel/random/uuid", O_RDONLY);
279 ssize_t readResult = read(fd, uuidString, UUID_STRING_SIZE - 1);
283 return RAND_UUID_READ_ERROR;
285 else if (readResult < UUID_STRING_SIZE - 1)
287 uuidString[0] = '\0';
288 return RAND_UUID_READ_ERROR;
291 uuidString[UUID_STRING_SIZE - 1] = '\0';
292 for (char* p = uuidString; *p; ++p)
301 return RAND_UUID_READ_ERROR;
303 #elif !defined(__ANDROID__) && (defined(__linux__) || defined(__APPLE__))
304 uint8_t uuid[UUID_SIZE];
305 int8_t ret = OCGenerateUuid(uuid);
312 uuid_unparse_lower(uuid, uuidString);
316 uint8_t uuid[UUID_SIZE];
317 OCGenerateUuid(uuid);
319 return OCConvertUuidToString(uuid, uuidString);
323 OCRandomUuidResult OCConvertUuidToString(const uint8_t uuid[UUID_SIZE],
324 char uuidString[UUID_STRING_SIZE])
326 if (uuid == NULL || uuidString == NULL)
328 return RAND_UUID_INVALID_PARAM;
332 int ret = snprintf(uuidString, UUID_STRING_SIZE,
333 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
334 uuid[0], uuid[1], uuid[2], uuid[3],
335 uuid[4], uuid[5], uuid[6], uuid[7],
336 uuid[8], uuid[9], uuid[10], uuid[11],
337 uuid[12], uuid[13], uuid[14], uuid[15]
340 if (ret != UUID_STRING_SIZE - 1)
342 return RAND_UUID_CONVERT_ERROR;