Crypto++ 8.9
Free C++ class library of cryptographic schemes
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Classes for access to the operating system's random number generators. More...
Go to the source code of this file.
Classes | |
class | OS_RNG_Err |
Exception thrown when an operating system error is encountered. More... | |
class | MicrosoftCryptoProvider |
class | NonblockingRng |
Wrapper class for /dev/random and /dev/srandom. More... | |
class | BlockingRng |
Wrapper class for /dev/random and /dev/srandom. More... | |
class | AutoSeededRandomPool |
Automatically Seeded Randomness Pool. More... | |
class | AutoSeededX917RNG< BLOCK_CIPHER > |
Automatically Seeded X9.17 RNG. More... | |
class | DefaultAutoSeededRNG |
A typedef providing a default generator. More... | |
Functions | |
CRYPTOPP_DLL void | OS_GenerateRandomBlock (bool blocking, byte *output, size_t size) |
OS_GenerateRandomBlock. | |
Variables | |
AutoSeededX917RNG< AES > | |
Classes for access to the operating system's random number generators.
Definition in file osrng.h.
CRYPTOPP_DLL void OS_GenerateRandomBlock | ( | bool | blocking, |
byte * | output, | ||
size_t | size ) |
OS_GenerateRandomBlock.
Generate random array of bytes
blocking | specifies whether a blocking or non-blocking generator should be used |
output | the byte buffer |
size | the length of the buffer, in bytes |
OS_GenerateRandomBlock() uses the underlying operating system's random number generator. On Windows, CryptGenRandom() is called using NonblockingRng.
On Unix and compatibles, /dev/urandom is called if blocking is false using NonblockingRng. If blocking is true, then either /dev/randomd or /dev/srandom is used by way of BlockingRng, if available.