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Add macOS 10.10+ / iOS 8.0+ PRNG CCRandomGenerateBytes() #1135

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Add macOS 10.10+ / iOS 8.0+ PRNG CCRandomGenerateBytes() #1135

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22 changes: 20 additions & 2 deletions osrng.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,19 @@
# include <stdlib.h>
#endif

#if defined(__APPLE__)
/* OS X 10.10+, iOS 8.0+ */
#if defined(__MACH__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 101000
#define USE_CCRANDOMGENERATEBYTES
#elif defined(__AVAILABILITY_INTERNAL__IPHONE_8_0_DEP__IPHONE_8_0)
#define USE_CCRANDOMGENERATEBYTES
#endif
Comment on lines +38 to +42
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@AraHaan AraHaan Jul 15, 2023 •
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Suggested change
#if defined(__MACH__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 101000
#define USE_CCRANDOMGENERATEBYTES
#elif defined(__AVAILABILITY_INTERNAL__IPHONE_8_0_DEP__IPHONE_8_0)
#define USE_CCRANDOMGENERATEBYTES
#endif
#if (defined(__MACH__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 101000) || defined(__AVAILABILITY_INTERNAL__IPHONE_8_0_DEP__IPHONE_8_0)
#define USE_CCRANDOMGENERATEBYTES
#endif

#endif

#ifdef USE_CCRANDOMGENERATEBYTES
#include <CommonCrypto/CommonRandom.h>
#endif

// Solaris links /dev/urandom -> ../devices/pseudo/random@0:urandom
// We can't access the device. Avoid O_NOFOLLOW for the platform.
#ifdef __sun
Expand Down Expand Up @@ -156,7 +169,7 @@ MicrosoftCryptoProvider::~MicrosoftCryptoProvider()

NonblockingRng::NonblockingRng()
{
#if !defined(CRYPTOPP_WIN32_AVAILABLE) && !defined(USE_FREEBSD_ARC4RANDOM)
#if !defined(CRYPTOPP_WIN32_AVAILABLE) && !defined(USE_FREEBSD_ARC4RANDOM) && !defined(USE_CCRANDOMGENERATEBYTES)
# ifndef DONT_USE_O_NOFOLLOW
const int flags = O_RDONLY|O_NOFOLLOW;
# else
Expand All @@ -172,7 +185,7 @@ NonblockingRng::NonblockingRng()

NonblockingRng::~NonblockingRng()
{
#if !defined(CRYPTOPP_WIN32_AVAILABLE) && !defined(USE_FREEBSD_ARC4RANDOM)
#if !defined(CRYPTOPP_WIN32_AVAILABLE) && !defined(USE_FREEBSD_ARC4RANDOM) && !defined(USE_CCRANDOMGENERATEBYTES)
close(m_fd);
#endif
}
Expand Down Expand Up @@ -221,6 +234,11 @@ void NonblockingRng::GenerateBlock(byte *output, size_t size)
// Cryptographic quality prng based on ChaCha20,
// https://www.freebsd.org/cgi/man.cgi?query=arc4random_buf
arc4random_buf(output, size);
# elif defined(USE_CCRANDOMGENERATEBYTES)
// Cryptographic quality prng built into macOS 10.10+ and iOS 8.0+
// https://opensource.apple.com/source/CommonCrypto/CommonCrypto-60074/include/CommonRandom.h.auto.html
if (CCRandomGenerateBytes(output, size) != kCCSuccess)
throw OS_RNG_Err("CCRandomGenerateBytes");
# else
while (size)
{
Expand Down