mirror of
https://github.com/veracrypt/VeraCrypt.git
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Windows: use separate assembly files for RDRAND and RDSEED in order to fix a mysterious crash when MASM_RDSEED_GenerateBlock is called after MASM_RDRAND_GenerateBlock.
This commit is contained in:
Mounir IDRASSI
@@ -397,6 +397,21 @@
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<Command Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">echo %(Filename)%(Extension) & ml.exe /nologo /D_M_X86 /W3 /Cx /Zi /safeseh /Fo "$(TargetDir)\%(Filename).obj" /c "%(FullPath)"
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</Command>
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<Command Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">echo %(Filename)%(Extension) & ml.exe /nologo /D_M_X86 /W3 /Cx /Zi /safeseh /Fo "$(TargetDir)\%(Filename).obj" /c "%(FullPath)"
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</Command>
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<Outputs Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">$(TargetDir)\%(Filename).obj;%(Outputs)</Outputs>
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<Outputs Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">$(TargetDir)\%(Filename).obj;%(Outputs)</Outputs>
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<Outputs Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">$(TargetDir)\%(Filename).obj;%(Outputs)</Outputs>
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<Outputs Condition="'$(Configuration)|$(Platform)'=='Release|x64'">$(TargetDir)\%(Filename).obj;%(Outputs)</Outputs>
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</CustomBuild>
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<CustomBuild Include="rdseed_ml.asm">
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<FileType>Document</FileType>
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<Command Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">echo %(Filename)%(Extension) & ml64.exe /nologo /D_M_X64 /W3 /Cx /Zi /Fo "$(TargetDir)\%(Filename).obj" /c "%(FullPath)"
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</Command>
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<Command Condition="'$(Configuration)|$(Platform)'=='Release|x64'">echo %(Filename)%(Extension) & ml64.exe /nologo /D_M_X64 /W3 /Cx /Zi /Fo "$(TargetDir)\%(Filename).obj" /c "%(FullPath)"
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</Command>
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<Command Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">echo %(Filename)%(Extension) & ml.exe /nologo /D_M_X86 /W3 /Cx /Zi /safeseh /Fo "$(TargetDir)\%(Filename).obj" /c "%(FullPath)"
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</Command>
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<Command Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">echo %(Filename)%(Extension) & ml.exe /nologo /D_M_X86 /W3 /Cx /Zi /safeseh /Fo "$(TargetDir)\%(Filename).obj" /c "%(FullPath)"
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</Command>
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<Outputs Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">$(TargetDir)\%(Filename).obj;%(Outputs)</Outputs>
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<Outputs Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">$(TargetDir)\%(Filename).obj;%(Outputs)</Outputs>
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@@ -217,5 +217,8 @@
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<CustomBuild Include="rdrand_ml.asm">
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<Filter>Source Files</Filter>
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</CustomBuild>
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<CustomBuild Include="rdseed_ml.asm">
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<Filter>Source Files</Filter>
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</CustomBuild>
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</ItemGroup>
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</Project>
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@@ -61,3 +61,7 @@ TC_ASM_ERR_LOG = ..\Driver\build_errors_asm.log
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"$(OBJ_PATH)\$(O)\rdrand_ml.obj": rdrand_ml.asm
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$(VC_MLEXE) $(VC_MLFLAGS) /Fo "$@" /c rdrand_ml.asm 2>$(TC_ASM_ERR_LOG)
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"$(OBJ_PATH)\$(O)\rdseed_ml.obj": rdseed_ml.asm
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$(VC_MLEXE) $(VC_MLFLAGS) /Fo "$@" /c rdseed_ml.asm 2>$(TC_ASM_ERR_LOG)
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@@ -25,6 +25,7 @@ SOURCES = \
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gost89_$(TC_ARCH).asm \
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Aes_hw_cpu.asm \
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rdrand_ml.asm \
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rdseed_ml.asm \
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Aeskey.c \
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Aestab.c \
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chacha-xmm.c \
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@@ -1,9 +1,9 @@
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;; rdrand.asm - written and placed in public domain by Jeffrey Walton and Uri Blumenthal.
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;; Copyright assigned to the Crypto++ project.
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;; This ASM file provides RDRAND and RDSEED to downlevel Microsoft tool chains.
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;; Everything "just works" under Visual Studio. Other platforms will have to
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;; run MASM/MASM-64 and then link to the object files.
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;; This ASM file provides RDRAND to downlevel Microsoft tool chains.
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;; Everything "just works" under Visual Studio. Other platforms will
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;; have to run MASM/MASM-64 and then link to the object files.
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;; set ASFLAGS=/nologo /D_M_X86 /W3 /Cx /Zi /safeseh
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;; set ASFLAGS64=/nologo /D_M_X64 /W3 /Cx /Zi
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@@ -13,11 +13,10 @@
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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TITLE MASM_RDRAND_GenerateBlock and MASM_RDSEED_GenerateBlock
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SUBTITLE Microsoft specific ASM code to utilize RDRAND and RDSEED for down level Microsoft toolchains
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TITLE MASM_RDRAND_GenerateBlock source file
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SUBTITLE Microsoft specific ASM code to utilize RDRAND for down level Microsoft toolchains
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PUBLIC MASM_RDRAND_GenerateBlock
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PUBLIC MASM_RDSEED_GenerateBlock
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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@@ -38,7 +37,6 @@ IFDEF _M_X86 ;; Set via the command line
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;; Fastcall calling conventions exports
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ALIAS <@MASM_RDRAND_GenerateBlock@8> = <MASM_RDRAND_GenerateBlock>
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ALIAS <@MASM_RDSEED_GenerateBlock@8> = <MASM_RDSEED_GenerateBlock>
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ENDIF
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@@ -63,13 +61,13 @@ MASM_RDRAND_GenerateBlock PROC ;; arg1:DWORD, arg2:DWORD
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bsize EQU edx
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;; Top of While loop
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GenerateBlock_Top:
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RDRAND_GenerateBlock_Top:
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;; Check remaining size
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cmp bsize, 0
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je GenerateBlock_Return
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je RDRAND_GenerateBlock_Return
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Call_RDRAND_EAX:
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RDRAND_Call_EAX:
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;; RDRAND is not available prior to VS2012. Just emit
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;; the byte codes using DB. This is `rdrand eax`.
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DB 0Fh, 0C7h, 0F0h
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@@ -78,46 +76,48 @@ Call_RDRAND_EAX:
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;; If CF=0, a random number was not available.
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;; Retry immediately
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jnc Call_RDRAND_EAX
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jnc RDRAND_Call_EAX
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RDRAND_succeeded:
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cmp bsize, MWSIZE
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jb Partial_Machine_Word
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jb RDRAND_Partial_Machine_Word
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Full_Machine_Word:
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RDRAND_Full_Machine_Word:
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mov DWORD PTR [buffer], eax
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add buffer, MWSIZE ;; No need for Intel Core 2 slow workarounds, like
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sub bsize, MWSIZE ;; `lea buffer,[buffer+MWSIZE]` for faster adds
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;; Continue
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jmp GenerateBlock_Top
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jmp RDRAND_GenerateBlock_Top
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;; 1,2,3 bytes remain
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Partial_Machine_Word:
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RDRAND_Partial_Machine_Word:
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;; Test bit 1 to see if size is at least 2
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test bsize, 2
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jz Bit_1_Not_Set
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jz RDRAND_Bit_1_Not_Set
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mov WORD PTR [buffer], ax
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shr eax, 16
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add buffer, 2
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Bit_1_Not_Set:
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RDRAND_Bit_1_Not_Set:
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;; Test bit 0 to see if size is at least 1
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test bsize, 1
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jz Bit_0_Not_Set
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jz RDRAND_Bit_0_Not_Set
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mov BYTE PTR [buffer], al
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;; shr ax, 8
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;; add buffer, 1
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Bit_0_Not_Set:
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RDRAND_Bit_0_Not_Set:
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;; We've hit all the bits
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GenerateBlock_Return:
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RDRAND_GenerateBlock_Return:
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;; Clear artifacts
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xor eax, eax
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@@ -127,9 +127,6 @@ MASM_RDRAND_GenerateBlock ENDP
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ENDIF ;; _M_X86
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OPTION PROLOGUE:PrologueDef
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OPTION EPILOGUE:EpilogueDef
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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@@ -151,13 +148,13 @@ MASM_RDRAND_GenerateBlock PROC ;; arg1:QWORD, arg2:QWORD
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bsize EQU rdx
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;; Top of While loop
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GenerateBlock_Top:
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RDRAND_GenerateBlock_Top:
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;; Check remaining size
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cmp bsize, 0
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je GenerateBlock_Return
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je RDRAND_GenerateBlock_Return
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Call_RDRAND_RAX:
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RDRAND_Call_RAX:
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;; RDRAND is not available prior to VS2012. Just emit
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;; the byte codes using DB. This is `rdrand rax`.
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DB 048h, 0Fh, 0C7h, 0F0h
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@@ -166,254 +163,67 @@ Call_RDRAND_RAX:
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;; If CF=0, a random number was not available.
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;; Retry immediately
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jnc Call_RDRAND_RAX
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jnc RDRAND_Call_RAX
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RDRAND_succeeded:
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cmp bsize, MWSIZE
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jb Partial_Machine_Word
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jb RDRAND_Partial_Machine_Word
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Full_Machine_Word:
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RDRAND_Full_Machine_Word:
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mov QWORD PTR [buffer], rax
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add buffer, MWSIZE
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sub bsize, MWSIZE
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;; Continue
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jmp GenerateBlock_Top
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jmp RDRAND_GenerateBlock_Top
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;; 1,2,3,4,5,6,7 bytes remain
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Partial_Machine_Word:
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RDRAND_Partial_Machine_Word:
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;; Test bit 2 to see if size is at least 4
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test bsize, 4
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jz Bit_2_Not_Set
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jz RDRAND_Bit_2_Not_Set
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mov DWORD PTR [buffer], eax
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shr rax, 32
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add buffer, 4
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Bit_2_Not_Set:
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RDRAND_Bit_2_Not_Set:
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;; Test bit 1 to see if size is at least 2
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test bsize, 2
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jz Bit_1_Not_Set
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jz RDRAND_Bit_1_Not_Set
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mov WORD PTR [buffer], ax
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shr eax, 16
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add buffer, 2
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Bit_1_Not_Set:
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RDRAND_Bit_1_Not_Set:
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;; Test bit 0 to see if size is at least 1
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test bsize, 1
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jz Bit_0_Not_Set
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jz RDRAND_Bit_0_Not_Set
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mov BYTE PTR [buffer], al
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;; shr ax, 8
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;; add buffer, 1
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Bit_0_Not_Set:
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RDRAND_Bit_0_Not_Set:
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;; We've hit all the bits
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GenerateBlock_Return:
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;; Clear artifacts
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xor rax, rax
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ret
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MASM_RDRAND_GenerateBlock ENDP
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ENDIF ;; _M_X64
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OPTION PROLOGUE:PrologueDef
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OPTION EPILOGUE:EpilogueDef
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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IFDEF _M_X86 ;; Set via the command line
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.CODE
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ALIGN 8
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OPTION PROLOGUE:NONE
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OPTION EPILOGUE:NONE
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;; No need for Load_Arguments due to fastcall
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;; ECX (in): arg1, byte* buffer
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;; EDX (in): arg2, size_t bsize
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MASM_RDSEED_GenerateBlock PROC ;; arg1:DWORD, arg2:DWORD
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MWSIZE EQU 04h ;; machine word size
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buffer EQU ecx
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bsize EQU edx
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;; Top of While loop
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GenerateBlock_Top:
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;; Check remaining size
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cmp bsize, 0
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je GenerateBlock_Return
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Call_RDSEED_EAX:
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;; RDSEED is not available prior to VS2012. Just emit
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;; the byte codes using DB. This is `rdseed eax`.
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DB 0Fh, 0C7h, 0F8h
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;; If CF=1, the number returned by RDSEED is valid.
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;; If CF=0, a random number was not available.
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;; Retry immediately
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jnc Call_RDSEED_EAX
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RDSEED_succeeded:
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cmp bsize, MWSIZE
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jb Partial_Machine_Word
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Full_Machine_Word:
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mov DWORD PTR [buffer], eax
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add buffer, MWSIZE ;; No need for Intel Core 2 slow workarounds, like
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sub bsize, MWSIZE ;; `lea buffer,[buffer+MWSIZE]` for faster adds
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;; Continue
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jmp GenerateBlock_Top
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;; 1,2,3 bytes remain
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Partial_Machine_Word:
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;; Test bit 1 to see if size is at least 2
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test bsize, 2
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jz Bit_1_Not_Set
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mov WORD PTR [buffer], ax
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shr eax, 16
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add buffer, 2
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Bit_1_Not_Set:
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;; Test bit 0 to see if size is at least 1
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test bsize, 1
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jz Bit_0_Not_Set
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mov BYTE PTR [buffer], al
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Bit_0_Not_Set:
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;; We've hit all the bits
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GenerateBlock_Return:
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;; Clear artifacts
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xor eax, eax
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ret
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MASM_RDSEED_GenerateBlock ENDP
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ENDIF ;; _M_X86
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OPTION PROLOGUE:PrologueDef
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OPTION EPILOGUE:EpilogueDef
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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IFDEF _M_X64 ;; Set via the command line
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.CODE
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ALIGN 16
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OPTION PROLOGUE:NONE
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OPTION EPILOGUE:NONE
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;; No need for Load_Arguments due to fastcall
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;; RCX (in): arg1, byte* buffer
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;; RDX (in): arg2, size_t bsize
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MASM_RDSEED_GenerateBlock PROC ;; arg1:QWORD, arg2:QWORD
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MWSIZE EQU 08h ;; machine word size
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buffer EQU rcx
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bsize EQU rdx
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;; Top of While loop
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GenerateBlock_Top:
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;; Check remaining size
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cmp bsize, 0
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je GenerateBlock_Return
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Call_RDSEED_RAX:
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;; RDSEED is not available prior to VS2012. Just emit
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;; the byte codes using DB. This is `rdseed rax`.
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DB 048h, 0Fh, 0C7h, 0F8h
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;; If CF=1, the number returned by RDSEED is valid.
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;; If CF=0, a random number was not available.
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;; Retry immediately
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jnc Call_RDSEED_RAX
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RDSEED_succeeded:
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cmp bsize, MWSIZE
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jb Partial_Machine_Word
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Full_Machine_Word:
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mov QWORD PTR [buffer], rax
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add buffer, MWSIZE
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sub bsize, MWSIZE
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;; Continue
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jmp GenerateBlock_Top
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;; 1,2,3,4,5,6,7 bytes remain
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Partial_Machine_Word:
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;; Test bit 2 to see if size is at least 4
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test bsize, 4
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jz Bit_2_Not_Set
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mov DWORD PTR [buffer], eax
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shr rax, 32
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add buffer, 4
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Bit_2_Not_Set:
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;; Test bit 1 to see if size is at least 2
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test bsize, 2
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jz Bit_1_Not_Set
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mov WORD PTR [buffer], ax
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shr eax, 16
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add buffer, 2
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Bit_1_Not_Set:
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;; Test bit 0 to see if size is at least 1
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test bsize, 1
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jz Bit_0_Not_Set
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mov BYTE PTR [buffer], al
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Bit_0_Not_Set:
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;; We've hit all the bits
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GenerateBlock_Return:
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RDRAND_GenerateBlock_Return:
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;; Clear artifacts
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xor rax, rax
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ret
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MASM_RDSEED_GenerateBlock ENDP
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MASM_RDRAND_GenerateBlock ENDP
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ENDIF ;; _M_X64
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|
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OPTION PROLOGUE:PrologueDef
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OPTION EPILOGUE:EpilogueDef
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||||
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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230
src/Crypto/rdseed_ml.asm
Normal file
230
src/Crypto/rdseed_ml.asm
Normal file
@@ -0,0 +1,230 @@
|
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;; rdrand.asm - written and placed in public domain by Jeffrey Walton and Uri Blumenthal.
|
||||
;; Copyright assigned to the Crypto++ project.
|
||||
|
||||
;; This ASM file provides RDSEED to downlevel Microsoft tool chains.
|
||||
;; Everything "just works" under Visual Studio. Other platforms will
|
||||
;; have to run MASM/MASM-64 and then link to the object files.
|
||||
|
||||
;; set ASFLAGS=/nologo /D_M_X86 /W3 /Cx /Zi /safeseh
|
||||
;; set ASFLAGS64=/nologo /D_M_X64 /W3 /Cx /Zi
|
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;; "C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\bin\ml.exe" %ASFLAGS% /Fo rdrand-x86.obj /c rdrand.asm
|
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;; "C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\bin\amd64\ml64.exe" %ASFLAGS64% /Fo rdrand-x64.obj /c rdrand.asm
|
||||
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
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|
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TITLE MASM_RDSEED_GenerateBlock source file
|
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SUBTITLE Microsoft specific ASM code to utilize RDSEED for down level Microsoft toolchains
|
||||
|
||||
PUBLIC MASM_RDSEED_GenerateBlock
|
||||
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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|
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;; C/C++ Function prototypes (both are fastcall)
|
||||
;; X86:
|
||||
;; extern "C" void __fastcall MASM_RDSEED_GenerateBlock(byte* ptr, size_t size);
|
||||
;; X64:
|
||||
;; extern "C" void __fastcall MASM_RDSEED_GenerateBlock(byte* ptr, size_t size);
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||||
|
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
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|
||||
IFDEF _M_X86 ;; Set via the command line
|
||||
|
||||
.486
|
||||
.MODEL FLAT
|
||||
|
||||
;; Fastcall calling conventions exports
|
||||
ALIAS <@MASM_RDSEED_GenerateBlock@8> = <MASM_RDSEED_GenerateBlock>
|
||||
|
||||
ENDIF
|
||||
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
|
||||
IFDEF _M_X86 ;; Set via the command line
|
||||
|
||||
.CODE
|
||||
ALIGN 8
|
||||
OPTION PROLOGUE:NONE
|
||||
OPTION EPILOGUE:NONE
|
||||
|
||||
;; No need for Load_Arguments due to fastcall
|
||||
;; ECX (in): arg1, byte* buffer
|
||||
;; EDX (in): arg2, size_t bsize
|
||||
|
||||
MASM_RDSEED_GenerateBlock PROC ;; arg1:DWORD, arg2:DWORD
|
||||
|
||||
MWSIZE EQU 04h ;; machine word size
|
||||
buffer EQU ecx
|
||||
bsize EQU edx
|
||||
|
||||
;; Top of While loop
|
||||
RDSEED_GenerateBlock_Top:
|
||||
|
||||
;; Check remaining size
|
||||
cmp bsize, 0
|
||||
je RDSEED_GenerateBlock_Return
|
||||
|
||||
RDSEED_Call_EAX:
|
||||
;; RDSEED is not available prior to VS2012. Just emit
|
||||
;; the byte codes using DB. This is `rdseed eax`.
|
||||
DB 0Fh, 0C7h, 0F8h
|
||||
|
||||
;; If CF=1, the number returned by RDSEED is valid.
|
||||
;; If CF=0, a random number was not available.
|
||||
|
||||
;; Retry immediately
|
||||
jnc RDSEED_Call_EAX
|
||||
|
||||
RDSEED_succeeded:
|
||||
|
||||
cmp bsize, MWSIZE
|
||||
jb RDSEED_Partial_Machine_Word
|
||||
|
||||
RDSEED_Full_Machine_Word:
|
||||
|
||||
mov DWORD PTR [buffer], eax
|
||||
add buffer, MWSIZE ;; No need for Intel Core 2 slow workarounds, like
|
||||
sub bsize, MWSIZE ;; `lea buffer,[buffer+MWSIZE]` for faster adds
|
||||
|
||||
;; Continue
|
||||
jmp RDSEED_GenerateBlock_Top
|
||||
|
||||
;; 1,2,3 bytes remain
|
||||
RDSEED_Partial_Machine_Word:
|
||||
|
||||
;; Test bit 1 to see if size is at least 2
|
||||
test bsize, 2
|
||||
jz RDSEED_Bit_1_Not_Set
|
||||
|
||||
mov WORD PTR [buffer], ax
|
||||
shr eax, 16
|
||||
add buffer, 2
|
||||
|
||||
RDSEED_Bit_1_Not_Set:
|
||||
|
||||
;; Test bit 0 to see if size is at least 1
|
||||
test bsize, 1
|
||||
jz RDSEED_Bit_0_Not_Set
|
||||
|
||||
mov BYTE PTR [buffer], al
|
||||
;; shr ax, 8
|
||||
;; add buffer, 1
|
||||
|
||||
RDSEED_Bit_0_Not_Set:
|
||||
|
||||
;; We've hit all the bits
|
||||
|
||||
RDSEED_GenerateBlock_Return:
|
||||
|
||||
;; Clear artifacts
|
||||
xor eax, eax
|
||||
ret
|
||||
|
||||
MASM_RDSEED_GenerateBlock ENDP
|
||||
|
||||
ENDIF ;; _M_X86
|
||||
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
|
||||
IFDEF _M_X64 ;; Set via the command line
|
||||
|
||||
.CODE
|
||||
ALIGN 16
|
||||
OPTION PROLOGUE:NONE
|
||||
OPTION EPILOGUE:NONE
|
||||
|
||||
;; No need for Load_Arguments due to fastcall
|
||||
;; RCX (in): arg1, byte* buffer
|
||||
;; RDX (in): arg2, size_t bsize
|
||||
|
||||
MASM_RDSEED_GenerateBlock PROC ;; arg1:QWORD, arg2:QWORD
|
||||
|
||||
MWSIZE EQU 08h ;; machine word size
|
||||
buffer EQU rcx
|
||||
bsize EQU rdx
|
||||
|
||||
;; Top of While loop
|
||||
RDSEED_GenerateBlock_Top:
|
||||
|
||||
;; Check remaining size
|
||||
cmp bsize, 0
|
||||
je RDSEED_GenerateBlock_Return
|
||||
|
||||
RDSEED_Call_RAX:
|
||||
;; RDSEED is not available prior to VS2012. Just emit
|
||||
;; the byte codes using DB. This is `rdseed rax`.
|
||||
DB 048h, 0Fh, 0C7h, 0F8h
|
||||
|
||||
;; If CF=1, the number returned by RDSEED is valid.
|
||||
;; If CF=0, a random number was not available.
|
||||
|
||||
;; Retry immediately
|
||||
jnc RDSEED_Call_RAX
|
||||
|
||||
RDSEED_succeeded:
|
||||
|
||||
cmp bsize, MWSIZE
|
||||
jb RDSEED_Partial_Machine_Word
|
||||
|
||||
RDSEED_Full_Machine_Word:
|
||||
|
||||
mov QWORD PTR [buffer], rax
|
||||
add buffer, MWSIZE
|
||||
sub bsize, MWSIZE
|
||||
|
||||
;; Continue
|
||||
jmp RDSEED_GenerateBlock_Top
|
||||
|
||||
;; 1,2,3,4,5,6,7 bytes remain
|
||||
RDSEED_Partial_Machine_Word:
|
||||
|
||||
;; Test bit 2 to see if size is at least 4
|
||||
test bsize, 4
|
||||
jz RDSEED_Bit_2_Not_Set
|
||||
|
||||
mov DWORD PTR [buffer], eax
|
||||
shr rax, 32
|
||||
add buffer, 4
|
||||
|
||||
RDSEED_Bit_2_Not_Set:
|
||||
|
||||
;; Test bit 1 to see if size is at least 2
|
||||
test bsize, 2
|
||||
jz RDSEED_Bit_1_Not_Set
|
||||
|
||||
mov WORD PTR [buffer], ax
|
||||
shr eax, 16
|
||||
add buffer, 2
|
||||
|
||||
RDSEED_Bit_1_Not_Set:
|
||||
|
||||
;; Test bit 0 to see if size is at least 1
|
||||
test bsize, 1
|
||||
jz RDSEED_Bit_0_Not_Set
|
||||
|
||||
mov BYTE PTR [buffer], al
|
||||
;; shr ax, 8
|
||||
;; add buffer, 1
|
||||
|
||||
RDSEED_Bit_0_Not_Set:
|
||||
|
||||
;; We've hit all the bits
|
||||
|
||||
RDSEED_GenerateBlock_Return:
|
||||
|
||||
;; Clear artifacts
|
||||
xor rax, rax
|
||||
ret
|
||||
|
||||
MASM_RDSEED_GenerateBlock ENDP
|
||||
|
||||
ENDIF ;; _M_X64
|
||||
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
|
||||
END
|
||||
Reference in New Issue
Block a user