558 lines
12 KiB
NASM
558 lines
12 KiB
NASM
;; 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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;; 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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;; "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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TITLE MASM_RRA_GenerateBlock and MASM_RSA_GenerateBlock
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SUBTITLE Microsoft specific ASM code to utilize RDRAND and RDSEED for down level Microsoft toolchains
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PUBLIC MASM_RRA_GenerateBlock
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PUBLIC MASM_RSA_GenerateBlock
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Naming convention used in rdrand.{h|cpp|asm}
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;; MSC = Microsoft Compiler (and compatibles)
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;; GCC = GNU Compiler (and compatibles)
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;; ALL = MSC and GCC (and compatibles)
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;; RRA = RDRAND, Assembly
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;; RSA = RDSEED, Assembly
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;; RRI = RDRAND, Intrinsic
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;; RSA = RDSEED, Intrinsic
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;; Caller/Callee Saved Registers
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;; https://msdn.microsoft.com/en-us/library/6t169e9c.aspx
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; C/C++ Function prototypes
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;; X86:
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;; extern "C" int MASM_RRA_GenerateBlock(byte* ptr, size_t size, unsigned int safety);
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;; X64:
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;; extern "C" int __fastcall MASM_RRA_GenerateBlock(byte* ptr, size_t size, unsigned int safety);
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Return values
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RDRAND_SUCCESS EQU 1
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RDRAND_FAILURE EQU 0
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RDSEED_SUCCESS EQU 1
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RDSEED_FAILURE EQU 0
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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IFDEF _M_X86 ;; Set via the command line
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.486
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.MODEL FLAT
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ENDIF
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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 LANGUAGE:C
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OPTION PROLOGUE:NONE
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OPTION EPILOGUE:NONE
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;; Base relative (in): arg1, byte* buffer
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;; Base relative (in): arg2, size_t bsize
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;; Base relative (in): arg3, unsigned int safety
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;; EAX (out): success (1), failure (0)
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MASM_RRA_GenerateBlock PROC arg1:DWORD,arg2:DWORD,arg3:DWORD
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MWSIZE EQU 04h ;; machine word size
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buffer EQU edi
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bsize EQU edx
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safety EQU ecx
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Load_Arguments:
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mov buffer, arg1
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mov bsize, arg2
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mov safety, arg3
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Validate_Pointer:
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cmp buffer, 0
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je GenerateBlock_PreRet
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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_Success
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Call_RDRAND_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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;; If CF=1, the number returned by RDRAND is valid.
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;; If CF=0, a random number was not available.
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jc RDRAND_succeeded
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RDRAND_failed:
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;; Exit if we've reached the limit
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cmp safety, 0
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je GenerateBlock_Failure
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dec safety
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jmp GenerateBlock_Top
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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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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 GenerateBlock_Success
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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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jmp GenerateBlock_Success
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GenerateBlock_PreRet:
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;; Test for success (was the request completely fulfilled?)
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cmp bsize, 0
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je GenerateBlock_Success
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GenerateBlock_Failure:
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xor eax, eax
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mov al, RDRAND_FAILURE
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ret
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GenerateBlock_Success:
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xor eax, eax
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mov al, RDRAND_SUCCESS
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ret
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MASM_RRA_GenerateBlock ENDP
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ENDIF ;; _M_X86
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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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;; RCX (in): arg1, byte* buffer
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;; RDX (in): arg2, size_t bsize
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;; R8d (in): arg3, unsigned int safety
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;; RAX (out): success (1), failure (0)
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MASM_RRA_GenerateBlock PROC
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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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safety EQU r8d
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;; No need for Load_Arguments due to fastcall
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Validate_Pointer:
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;; Validate pointer
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cmp buffer, 0
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je GenerateBlock_PreRet
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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_Success
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Call_RDRAND_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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;; If CF=1, the number returned by RDRAND is valid.
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;; If CF=0, a random number was not available.
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jc RDRAND_succeeded
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RDRAND_failed:
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;; Exit if we've reached the limit
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cmp safety, 0
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je GenerateBlock_Failure
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dec safety
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jmp GenerateBlock_Top
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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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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 GenerateBlock_Success
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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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jmp GenerateBlock_Success
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GenerateBlock_PreRet:
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;; Test for success (was the request completely fulfilled?)
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cmp bsize, 0
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je GenerateBlock_Success
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GenerateBlock_Failure:
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xor rax, rax
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mov al, RDRAND_FAILURE
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ret
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GenerateBlock_Success:
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xor rax, rax
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mov al, RDRAND_SUCCESS
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ret
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MASM_RRA_GenerateBlock ENDP
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ENDIF ;; _M_X64
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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 LANGUAGE:C
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OPTION PROLOGUE:NONE
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OPTION EPILOGUE:NONE
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;; Base relative (in): arg1, byte* buffer
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;; Base relative (in): arg2, size_t bsize
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;; Base relative (in): arg3, unsigned int safety
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;; EAX (out): success (1), failure (0)
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MASM_RSA_GenerateBlock PROC arg1:DWORD,arg2:DWORD,arg3:DWORD
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MWSIZE EQU 04h ;; machine word size
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buffer EQU edi
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bsize EQU edx
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safety EQU ecx
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Load_Arguments:
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mov buffer, arg1
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mov bsize, arg2
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mov safety, arg3
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Validate_Pointer:
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cmp buffer, 0
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je GenerateBlock_PreRet
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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_Success
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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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jc RDSEED_succeeded
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RDSEED_failed:
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;; Exit if we've reached the limit
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cmp safety, 0
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je GenerateBlock_Failure
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dec safety
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jmp GenerateBlock_Top
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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 GenerateBlock_Success
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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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jmp GenerateBlock_Success
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GenerateBlock_PreRet:
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;; Test for success (was the request completely fulfilled?)
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cmp bsize, 0
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je GenerateBlock_Success
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GenerateBlock_Failure:
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xor eax, eax
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mov al, RDSEED_FAILURE
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ret
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GenerateBlock_Success:
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xor eax, eax
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mov al, RDSEED_SUCCESS
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ret
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MASM_RSA_GenerateBlock ENDP
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ENDIF ;; _M_X86
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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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;; RCX (in): arg1, byte* buffer
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;; RDX (in): arg2, size_t bsize
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;; R8d (in): arg3, unsigned int safety
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;; RAX (out): success (1), failure (0)
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MASM_RSA_GenerateBlock PROC ;; arg1:QWORD,arg2:QWORD,arg3:DWORD
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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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safety EQU r8d
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;; No need for Load_Arguments due to fastcall
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Validate_Pointer:
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;; Validate pointer
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cmp buffer, 0
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je GenerateBlock_PreRet
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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_Success
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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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jc RDSEED_succeeded
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RDSEED_failed:
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;; Exit if we've reached the limit
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cmp safety, 0
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je GenerateBlock_Failure
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dec safety
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jmp GenerateBlock_Top
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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 GenerateBlock_Success
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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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jmp GenerateBlock_Success
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GenerateBlock_PreRet:
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;; Test for success (was the request completely fulfilled?)
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cmp bsize, 0
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je GenerateBlock_Success
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GenerateBlock_Failure:
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xor rax, rax
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mov al, RDSEED_FAILURE
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ret
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GenerateBlock_Success:
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xor rax, rax
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mov al, RDSEED_SUCCESS
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ret
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MASM_RSA_GenerateBlock ENDP
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ENDIF ;; _M_X64
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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END
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