Simplify RDRAND and RDSEED implementation selection logic. Its was too convoluted
Jeffrey Walton
parent
a017dbdeab
commit
0deae2c974
84
rdrand.cpp
84
rdrand.cpp
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@ -45,69 +45,41 @@
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/////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////
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// According to Wei, CRYPTOPP_DISABLE_ASM is a failsafe due to the assembler.
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// We sidestep it because it does not limit us. The assembler does not limit
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// us because we emit out own byte codes as needed. To diasble RDRAND or
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// RDSEED, set CRYPTOPP_BOOL_RDRAND_ASM or CRYPTOPP_BOOL_RDSEED_ASM to 0.
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#ifndef CRYPTOPP_CPUID_AVAILABLE
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#if (CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64)
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# ifndef CRYPTOPP_CPUID_AVAILABLE
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# define CRYPTOPP_CPUID_AVAILABLE
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# endif
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#endif
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#if defined(CRYPTOPP_CPUID_AVAILABLE) && !defined(CRYPTOPP_BOOL_RDRAND_ASM)
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# define CRYPTOPP_BOOL_RDRAND_ASM 1
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#else
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# define CRYPTOPP_BOOL_RDRAND_ASM 0
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#endif
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#if defined(CRYPTOPP_CPUID_AVAILABLE) && !defined(CRYPTOPP_BOOL_RDSEED_ASM)
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# define CRYPTOPP_BOOL_RDSEED_ASM 1
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#else
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# define CRYPTOPP_BOOL_RDSEED_ASM 0
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#endif
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#if defined(CRYPTOPP_CPUID_AVAILABLE)
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# define MSC_INTRIN_COMPILER ((CRYPTOPP_MSC_VERSION >= 1700) || (CRYPTOPP_LLVM_CLANG_VERSION >= 30200) || (_INTEL_COMPILER >= 1210))
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# define GCC_INTRIN_COMPILER ((CRYPTOPP_GCC_VERSION >= 40600) || (CRYPTOPP_LLVM_CLANG_VERSION >= 30200) || (_INTEL_COMPILER >= 1210)) || (__SUNPRO_CC >= 0x5130)
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#else
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# define MSC_INTRIN_COMPILER 0
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# define GCC_INTRIN_COMPILER 0
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#endif
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// In general, the library's ASM code is best on Windows, and Intrinsics is
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// the best code under GCC and compatibles. We favor them accordingly.
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// the best code under GCC. Clang is missing symbols, so it gets ASM.
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// The NASM code is optimized well on Linux, but its not easy to cut-in.
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#if defined(CRYPTOPP_CPUID_AVAILABLE) && (CRYPTOPP_MSC_VERSION >= 1200)
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# if CRYPTOPP_BOOL_RDRAND_ASM
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#if defined(CRYPTOPP_MSC_VERSION)
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# define MASM_RDRAND_ASM_AVAILABLE 1
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# elif MSC_INTRIN_COMPILER
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# define ALL_RDRAND_INTRIN_AVAILABLE 1
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# endif
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# if CRYPTOPP_BOOL_RDSEED_ASM
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# define MASM_RDSEED_ASM_AVAILABLE 1
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# elif MSC_INTRIN_COMPILER
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# define ALL_RDSEED_INTRIN_AVAILABLE 1
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# endif
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#elif defined(CRYPTOPP_CPUID_AVAILABLE) && (CRYPTOPP_GCC_VERSION >= 30200)
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# if GCC_INTRIN_COMPILER && defined(__RDRND__)
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#elif defined(CRYPTOPP_LLVM_CLANG_VERSION) || defined(CRYPTOPP_APPLE_CLANG_VERSION)
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# define GCC_RDRAND_ASM_AVAILABLE 1
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# define GCC_RDSEED_ASM_AVAILABLE 1
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#elif defined(__SUNPRO_CC)
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# if defined(__RDRND__) && (__SUNPRO_CC >= 0x5130)
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# define ALL_RDRAND_INTRIN_AVAILABLE 1
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# elif CRYPTOPP_BOOL_RDRAND_ASM
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# elif (__SUNPRO_CC >= 0x5100)
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# define GCC_RDRAND_ASM_AVAILABLE 1
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# endif
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# if GCC_INTRIN_COMPILER && defined(__RDSEED__)
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# if defined(__RDSEED__) && (__SUNPRO_CC >= 0x5140)
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# define ALL_RDSEED_INTRIN_AVAILABLE 1
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# elif CRYPTOPP_BOOL_RDSEED_ASM
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# elif (__SUNPRO_CC >= 0x5100)
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# define GCC_RDSEED_ASM_AVAILABLE 1
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# endif
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#elif defined(CRYPTOPP_CPUID_AVAILABLE) && (__SUNPRO_CC >= 0x5100)
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# if GCC_INTRIN_COMPILER && defined(__RDRND__) && (__SUNPRO_CC >= 0x5130)
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#elif defined(CRYPTOPP_GCC_VERSION)
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# if defined(__RDRND__) && (CRYPTOPP_GCC_VERSION >= 30200)
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# define ALL_RDRAND_INTRIN_AVAILABLE 1
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# elif CRYPTOPP_BOOL_RDRAND_ASM
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# else
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# define GCC_RDRAND_ASM_AVAILABLE 1
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# endif
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# if GCC_INTRIN_COMPILER && defined(__RDSEED__) && (__SUNPRO_CC >= 0x5140)
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# if defined(__RDSEED__) && (CRYPTOPP_GCC_VERSION >= 30200)
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# define ALL_RDSEED_INTRIN_AVAILABLE 1
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# elif CRYPTOPP_BOOL_RDSEED_ASM
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# else
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# define GCC_RDSEED_ASM_AVAILABLE 1
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# endif
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#endif
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@ -238,11 +210,7 @@ static int ALL_RRI_GenerateBlock(byte *output, size_t size, unsigned int safety)
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}
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}
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#if CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X32
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*((volatile word32*)&val) = 0;
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#else
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*((volatile word64*)&val) = 0;
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#endif
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SecureWipeBuffer(&val, 1);
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return int(size == 0);
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}
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@ -302,11 +270,7 @@ static int GCC_RRA_GenerateBlock(byte *output, size_t size, unsigned int safety)
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}
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}
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#if CRYPTOPP_BOOL_X64 || CRYPTOPP_BOOL_X32
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*((volatile word64*)&val) = 0;
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#else
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*((volatile word32*)&val) = 0;
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#endif
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SecureWipeBuffer(&val, 1);
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return int(size == 0);
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}
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@ -419,11 +383,7 @@ static int ALL_RSI_GenerateBlock(byte *output, size_t size, unsigned int safety)
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}
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}
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#if CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X32
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*((volatile word32*)&val) = 0;
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#else
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*((volatile word64*)&val) = 0;
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#endif
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SecureWipeBuffer(&val, 1);
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return int(size == 0);
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}
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@ -483,11 +443,7 @@ static int GCC_RSA_GenerateBlock(byte *output, size_t size, unsigned int safety)
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}
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}
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#if CRYPTOPP_BOOL_X64 || CRYPTOPP_BOOL_X32
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*((volatile word64*)&val) = 0;
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#else
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*((volatile word32*)&val) = 0;
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#endif
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SecureWipeBuffer(&val, 1);
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return int(size == 0);
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}
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