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// rdrand.cpp - written and placed in public domain by Jeffrey Walton and Uri Blumenthal.
#include "pch.h"
#include "config.h"
#include "cryptlib.h"
#include "secblock.h"
#include "rdrand.h"
#include "cpu.h"
#if CRYPTOPP_MSC_VERSION
# pragma warning(disable: 4100)
#endif
// This file (and friends) provides both RDRAND and RDSEED. They were added at
// Crypto++ 5.6.3. At compile time, it uses CRYPTOPP_BOOL_{X86|X32|X64}
// to select an implementation or "throw NotImplemented". The class does not
// determine if RDRAND or RDSEED are available at runtime. If not available,
// then a SIGILL will result. Users of the classes should call HasRDRAND()
// or HasRDSEED() to determine if a generator is available.
// The original classes accepted a retry count. Retries were superflous for
// RDRAND, and RDSEED encountered a failure about 1 in 256 bytes depending
// on the processor. Retries were removed at Crypto++ 6.0 because
// GenerateBlock unconditionally retries and always fulfills the request.
/////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////
// For Linux, NASM is optional. Run rdrand-nasm.sh, and then make
// with "USE_NASM" like so: USE_NASM=1 make -j 4. The makefile
// will add the appropriate defines when building rdrand.cpp,
// and add the appropriate object file during link.
#if 0
#define NASM_RDRAND_ASM_AVAILABLE 1
#define NASM_RDSEED_ASM_AVAILABLE 1
#endif
/////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////
#if defined(CRYPTOPP_CPUID_AVAILABLE)
# if defined(CRYPTOPP_MSC_VERSION)
# if (CRYPTOPP_MSC_VERSION >= 1700)
# define ALL_RDRAND_INTRIN_AVAILABLE 1
# else
# define MASM_RDRAND_ASM_AVAILABLE 1
# endif
# if (CRYPTOPP_MSC_VERSION >= 1800)
# define ALL_RDSEED_INTRIN_AVAILABLE 1
# else
# define MASM_RDSEED_ASM_AVAILABLE 1
# endif
# elif defined(CRYPTOPP_LLVM_CLANG_VERSION) || defined(CRYPTOPP_APPLE_CLANG_VERSION)
# if defined(__RDRND__)
# define ALL_RDRAND_INTRIN_AVAILABLE 1
# else
# define GCC_RDRAND_ASM_AVAILABLE 1
# endif
# if defined(__RDSEED__)
# define ALL_RDSEED_INTRIN_AVAILABLE 1
# else
# define GCC_RDSEED_ASM_AVAILABLE 1
# endif
# elif defined(__SUNPRO_CC)
# if defined(__RDRND__) && (__SUNPRO_CC >= 0x5130)
# define ALL_RDRAND_INTRIN_AVAILABLE 1
# elif (__SUNPRO_CC >= 0x5100)
# define GCC_RDRAND_ASM_AVAILABLE 1
# endif
# if defined(__RDSEED__) && (__SUNPRO_CC >= 0x5140)
# define ALL_RDSEED_INTRIN_AVAILABLE 1
# elif (__SUNPRO_CC >= 0x5100)
# define GCC_RDSEED_ASM_AVAILABLE 1
# endif
# elif defined(CRYPTOPP_GCC_VERSION)
# if defined(__RDRND__) && (CRYPTOPP_GCC_VERSION >= 40600)
# define ALL_RDRAND_INTRIN_AVAILABLE 1
# else
# define GCC_RDRAND_ASM_AVAILABLE 1
# endif
# if defined(__RDSEED__) && (CRYPTOPP_GCC_VERSION >= 40600)
# define ALL_RDSEED_INTRIN_AVAILABLE 1
# else
# define GCC_RDSEED_ASM_AVAILABLE 1
# endif
# endif
#endif
/////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////
#if (ALL_RDRAND_INTRIN_AVAILABLE || ALL_RDSEED_INTRIN_AVAILABLE)
# include <immintrin.h> // rdrand, MSC, ICC, GCC, and SunCC
# if defined(__GNUC__) && (CRYPTOPP_GCC_VERSION >= 40600)
# include <x86intrin.h> // rdseed for some compilers, like GCC
# endif
# if defined(__has_include)
# if __has_include(<x86intrin.h>)
# include <x86intrin.h>
# endif
# endif
#endif
#if MASM_RDRAND_ASM_AVAILABLE
extern "C" void CRYPTOPP_FASTCALL MASM_RDRAND_GenerateBlock(byte*, size_t);
#endif
#if MASM_RDSEED_ASM_AVAILABLE
extern "C" void CRYPTOPP_FASTCALL MASM_RDSEED_GenerateBlock(byte*, size_t);
#endif
#if NASM_RDRAND_ASM_AVAILABLE
extern "C" void NASM_RDRAND_GenerateBlock(byte*, size_t);
#endif
#if NASM_RDSEED_ASM_AVAILABLE
extern "C" void NASM_RDSEED_GenerateBlock(byte*, size_t);
#endif
/////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////
NAMESPACE_BEGIN(CryptoPP)
// Fills 4 bytes
inline void RDRAND32(void* output)
{
#if defined(__SUNPRO_CC)
__asm__ __volatile__
(
".byte 0x0f, 0xc7, 0xf0;\n"
".byte 0x73, 0xfb;\n"
: "=a" (*reinterpret_cast<word32*>(output))
: : "cc"
);
#elif defined(GCC_RDRAND_ASM_AVAILABLE) && (CRYPTOPP_GCC_VERSION >= 40600)
__asm__ __volatile__
(
INTEL_NOPREFIX
ASL(1)
AS1(rdrand eax)
ASJ(jnc, 1, b)
ATT_NOPREFIX
: "=a" (*reinterpret_cast<word32*>(output))
: : "cc"
);
#elif defined(GCC_RDRAND_ASM_AVAILABLE) && (CRYPTOPP_GCC_VERSION >= 30200)
__asm__ __volatile__
(
".byte 0x0f, 0xc7, 0xf0;\n"
".byte 0x73, 0xfb;\n"
: "=a" (*reinterpret_cast<word32*>(output))
: : "cc"
);
#elif defined(ALL_RDRAND_INTRIN_AVAILABLE)
while(!_rdrand32_step(reinterpret_cast<word32*>(output))) {}
#else
// RDRAND not detected at compile time, or no suitable compiler found
throw NotImplemented("RDRAND: failed to find an implementation");
#endif
}
#if CRYPTOPP_BOOL_X64
// Fills 8 bytes
inline void RDRAND64(void* output)
{
#if defined(__SUNPRO_CC) && (__SUNPRO_CC >= 0x5100)
__asm__ __volatile__
(
".byte 0x48, 0x0f, 0xc7, 0xf0;\n"
".byte 0x73, 0xfa;\n"
: "=a" (*reinterpret_cast<word64*>(output))
: : "cc"
);
#elif defined(GCC_RDRAND_ASM_AVAILABLE) && (CRYPTOPP_GCC_VERSION >= 40600)
__asm__ __volatile__
(
INTEL_NOPREFIX
ASL(1)
AS1(rdrand rax)
ASJ(jnc, 1, b)
ATT_NOPREFIX
: "=a" (*reinterpret_cast<word64*>(output))
: : "cc"
);
#elif defined(GCC_RDRAND_ASM_AVAILABLE) && (CRYPTOPP_GCC_VERSION >= 30200)
__asm__ __volatile__
(
".byte 0x48, 0x0f, 0xc7, 0xf0;\n"
".byte 0x73, 0xfa;\n"
: "=a" (*reinterpret_cast<word64*>(output))
: : "cc"
);
#elif defined(ALL_RDRAND_INTRIN_AVAILABLE)
while(!_rdrand64_step(reinterpret_cast<unsigned long long*>(output))) {}
#else
// RDRAND not detected at compile time, or no suitable compiler found
throw NotImplemented("RDRAND: failed to find an implementation");
#endif
}
#endif // CRYPTOPP_BOOL_X64 and RDRAND64
void RDRAND::GenerateBlock(byte *output, size_t size)
{
CRYPTOPP_ASSERT((output && size) || !(output || size));
if (size == 0) return;
#if defined(NASM_RDRAND_ASM_AVAILABLE)
NASM_RDRAND_GenerateBlock(output, size);
#elif defined(MASM_RDRAND_ASM_AVAILABLE)
MASM_RDRAND_GenerateBlock(output, size);
#elif CRYPTOPP_BOOL_X64
size_t i = 0;
for (i = 0; i < size/8; i++)
RDRAND64(reinterpret_cast<word64*>(output)+i);
output += i*8;
size -= i*8;
if (size)
{
word64 val;
RDRAND64(&val);
std::memcpy(output, &val, size);
}
#elif (CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X86)
size_t i = 0;
for (i = 0; i < size/4; i++)
RDRAND32(reinterpret_cast<word32*>(output)+i);
output += i*4;
size -= i*4;
if (size)
{
word32 val;
RDRAND32(&val);
std::memcpy(output, &val, size);
}
#else
// RDRAND not detected at compile time, or no suitable compiler found
throw NotImplemented("RDRAND: failed to find a suitable implementation");
#endif
}
void RDRAND::DiscardBytes(size_t n)
{
// RoundUpToMultipleOf is used because a full word is read, and its cheaper
// to discard full words. There's no sense in dealing with tail bytes.
FixedSizeSecBlock<word64, 16> discard;
n = RoundUpToMultipleOf(n, sizeof(word64));
size_t count = STDMIN(n, discard.SizeInBytes());
while (count)
{
GenerateBlock(discard.BytePtr(), count);
n -= count;
count = STDMIN(n, discard.SizeInBytes());
}
}
/////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////
// Fills 4 bytes
inline void RDSEED32(void* output)
{
#if defined(__SUNPRO_CC)
__asm__ __volatile__
(
".byte 0x0f, 0xc7, 0xf8;\n"
".byte 0x73, 0xfb;\n"
: "=a" (*reinterpret_cast<word32*>(output))
: : "cc"
);
#elif defined(GCC_RDSEED_ASM_AVAILABLE) && (CRYPTOPP_GCC_VERSION >= 40600)
__asm__ __volatile__
(
INTEL_NOPREFIX
ASL(1)
AS1(rdseed eax)
ASJ(jnc, 1, b)
ATT_NOPREFIX
: "=a" (*reinterpret_cast<word32*>(output))
: : "cc"
);
#elif defined(GCC_RDSEED_ASM_AVAILABLE) && (CRYPTOPP_GCC_VERSION >= 30200)
__asm__ __volatile__
(
".byte 0x0f, 0xc7, 0xf8;\n"
".byte 0x73, 0xfb;\n"
: "=a" (*reinterpret_cast<word32*>(output))
: : "cc"
);
#elif defined(ALL_RDSEED_INTRIN_AVAILABLE)
while(!_rdseed32_step(reinterpret_cast<word32*>(output))) {}
#else
// RDSEED not detected at compile time, or no suitable compiler found
throw NotImplemented("RDSEED: failed to find an implementation");
#endif
}
#if CRYPTOPP_BOOL_X64
// Fills 8 bytes
inline void RDSEED64(void* output)
{
#if defined(__SUNPRO_CC) && (__SUNPRO_CC >= 0x5100)
__asm__ __volatile__
(
".byte 0x48, 0x0f, 0xc7, 0xf8;\n"
".byte 0x73, 0xfa;\n"
: "=a" (*reinterpret_cast<word64*>(output))
: : "cc"
);
#elif defined(GCC_RDSEED_ASM_AVAILABLE) && (CRYPTOPP_GCC_VERSION >= 40600)
__asm__ __volatile__
(
INTEL_NOPREFIX
ASL(1)
AS1(rdseed rax)
ASJ(jnc, 1, b)
ATT_NOPREFIX
: "=a" (*reinterpret_cast<word64*>(output))
: : "cc"
);
#elif defined(GCC_RDSEED_ASM_AVAILABLE) && (CRYPTOPP_GCC_VERSION >= 30200)
__asm__ __volatile__
(
".byte 0x48, 0x0f, 0xc7, 0xf8;\n"
".byte 0x73, 0xfa;\n"
: "=a" (*reinterpret_cast<word64*>(output))
: : "cc"
);
#elif defined(ALL_RDSEED_INTRIN_AVAILABLE)
while(!_rdseed64_step(reinterpret_cast<unsigned long long*>(output))) {}
#else
// RDSEED not detected at compile time, or no suitable compiler found
throw NotImplemented("RDSEED: failed to find an implementation");
#endif
}
#endif // CRYPTOPP_BOOL_X64 and RDSEED64
void RDSEED::GenerateBlock(byte *output, size_t size)
{
CRYPTOPP_ASSERT((output && size) || !(output || size));
if (size == 0) return;
#if defined(NASM_RDSEED_ASM_AVAILABLE)
NASM_RDSEED_GenerateBlock(output, size);
#elif defined(MASM_RDSEED_ASM_AVAILABLE)
MASM_RDSEED_GenerateBlock(output, size);
#elif CRYPTOPP_BOOL_X64
size_t i = 0;
for (i = 0; i < size/8; i++)
RDSEED64(reinterpret_cast<word64*>(output)+i);
output += i*8;
size -= i*8;
if (size)
{
word64 val;
RDSEED64(&val);
std::memcpy(output, &val, size);
}
#elif (CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X86)
size_t i = 0;
for (i = 0; i < size/4; i++)
RDSEED32(reinterpret_cast<word32*>(output)+i);
output += i*4;
size -= i*4;
if (size)
{
word32 val;
RDSEED32(&val);
std::memcpy(output, &val, size);
}
#endif
}
void RDSEED::DiscardBytes(size_t n)
{
// RoundUpToMultipleOf is used because a full word is read, and its cheaper
// to discard full words. There's no sense in dealing with tail bytes.
FixedSizeSecBlock<word64, 16> discard;
n = RoundUpToMultipleOf(n, sizeof(word64));
size_t count = STDMIN(n, discard.SizeInBytes());
while (count)
{
GenerateBlock(discard.BytePtr(), count);
n -= count;
count = STDMIN(n, discard.SizeInBytes());
}
}
NAMESPACE_END
|
