VeraCrypt
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-rw-r--r--src/Crypto/rdrand_ml.asm266
1 files changed, 38 insertions, 228 deletions
diff --git a/src/Crypto/rdrand_ml.asm b/src/Crypto/rdrand_ml.asm
index 1579a15..4b85f7f 100644
--- a/src/Crypto/rdrand_ml.asm
+++ b/src/Crypto/rdrand_ml.asm
@@ -1,9 +1,9 @@
;; rdrand.asm - written and placed in public domain by Jeffrey Walton and Uri Blumenthal.
;; Copyright assigned to the Crypto++ project.
-;; This ASM file provides RDRAND and 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.
+;; This ASM file provides RDRAND 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
@@ -13,11 +13,10 @@
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-TITLE MASM_RDRAND_GenerateBlock and MASM_RDSEED_GenerateBlock
-SUBTITLE Microsoft specific ASM code to utilize RDRAND and RDSEED for down level Microsoft toolchains
+TITLE MASM_RDRAND_GenerateBlock source file
+SUBTITLE Microsoft specific ASM code to utilize RDRAND for down level Microsoft toolchains
PUBLIC MASM_RDRAND_GenerateBlock
-PUBLIC MASM_RDSEED_GenerateBlock
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -38,7 +37,6 @@ IFDEF _M_X86 ;; Set via the command line
;; Fastcall calling conventions exports
ALIAS <@MASM_RDRAND_GenerateBlock@8> = <MASM_RDRAND_GenerateBlock>
-ALIAS <@MASM_RDSEED_GenerateBlock@8> = <MASM_RDSEED_GenerateBlock>
ENDIF
@@ -63,13 +61,13 @@ MASM_RDRAND_GenerateBlock PROC ;; arg1:DWORD, arg2:DWORD
bsize EQU edx
;; Top of While loop
-GenerateBlock_Top:
+RDRAND_GenerateBlock_Top:
;; Check remaining size
cmp bsize, 0
- je GenerateBlock_Return
+ je RDRAND_GenerateBlock_Return
-Call_RDRAND_EAX:
+RDRAND_Call_EAX:
;; RDRAND is not available prior to VS2012. Just emit
;; the byte codes using DB. This is `rdrand eax`.
DB 0Fh, 0C7h, 0F0h
@@ -78,46 +76,48 @@ Call_RDRAND_EAX:
;; If CF=0, a random number was not available.
;; Retry immediately
- jnc Call_RDRAND_EAX
+ jnc RDRAND_Call_EAX
RDRAND_succeeded:
cmp bsize, MWSIZE
- jb Partial_Machine_Word
+ jb RDRAND_Partial_Machine_Word
-Full_Machine_Word:
+RDRAND_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 GenerateBlock_Top
+ jmp RDRAND_GenerateBlock_Top
;; 1,2,3 bytes remain
-Partial_Machine_Word:
+RDRAND_Partial_Machine_Word:
;; Test bit 1 to see if size is at least 2
test bsize, 2
- jz Bit_1_Not_Set
+ jz RDRAND_Bit_1_Not_Set
mov WORD PTR [buffer], ax
shr eax, 16
add buffer, 2
-Bit_1_Not_Set:
+RDRAND_Bit_1_Not_Set:
;; Test bit 0 to see if size is at least 1
test bsize, 1
- jz Bit_0_Not_Set
+ jz RDRAND_Bit_0_Not_Set
mov BYTE PTR [buffer], al
+ ;; shr ax, 8
+ ;; add buffer, 1
-Bit_0_Not_Set:
+RDRAND_Bit_0_Not_Set:
;; We've hit all the bits
-GenerateBlock_Return:
+RDRAND_GenerateBlock_Return:
;; Clear artifacts
xor eax, eax
@@ -127,9 +127,6 @@ MASM_RDRAND_GenerateBlock ENDP
ENDIF ;; _M_X86
-OPTION PROLOGUE:PrologueDef
-OPTION EPILOGUE:EpilogueDef
-
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -151,13 +148,13 @@ MASM_RDRAND_GenerateBlock PROC ;; arg1:QWORD, arg2:QWORD
bsize EQU rdx
;; Top of While loop
-GenerateBlock_Top:
+RDRAND_GenerateBlock_Top:
;; Check remaining size
cmp bsize, 0
- je GenerateBlock_Return
+ je RDRAND_GenerateBlock_Return
-Call_RDRAND_RAX:
+RDRAND_Call_RAX:
;; RDRAND is not available prior to VS2012. Just emit
;; the byte codes using DB. This is `rdrand rax`.
DB 048h, 0Fh, 0C7h, 0F0h
@@ -166,254 +163,67 @@ Call_RDRAND_RAX:
;; If CF=0, a random number was not available.
;; Retry immediately
- jnc Call_RDRAND_RAX
+ jnc RDRAND_Call_RAX
RDRAND_succeeded:
cmp bsize, MWSIZE
- jb Partial_Machine_Word
-
-Full_Machine_Word:
-
- mov QWORD PTR [buffer], rax
- add buffer, MWSIZE
- sub bsize, MWSIZE
-
- ;; Continue
- jmp GenerateBlock_Top
-
- ;; 1,2,3,4,5,6,7 bytes remain
-Partial_Machine_Word:
-
- ;; Test bit 2 to see if size is at least 4
- test bsize, 4
- jz Bit_2_Not_Set
-
- mov DWORD PTR [buffer], eax
- shr rax, 32
- add buffer, 4
-
-Bit_2_Not_Set:
-
- ;; Test bit 1 to see if size is at least 2
- test bsize, 2
- jz Bit_1_Not_Set
-
- mov WORD PTR [buffer], ax
- shr eax, 16
- add buffer, 2
-
-Bit_1_Not_Set:
-
- ;; Test bit 0 to see if size is at least 1
- test bsize, 1
- jz Bit_0_Not_Set
-
- mov BYTE PTR [buffer], al
-
-Bit_0_Not_Set:
-
- ;; We've hit all the bits
-
-GenerateBlock_Return:
-
- ;; Clear artifacts
- xor rax, rax
- ret
-
-MASM_RDRAND_GenerateBlock ENDP
-
-ENDIF ;; _M_X64
-
-OPTION PROLOGUE:PrologueDef
-OPTION EPILOGUE:EpilogueDef
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
-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
-GenerateBlock_Top:
-
- ;; Check remaining size
- cmp bsize, 0
- je GenerateBlock_Return
-
-Call_RDSEED_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 Call_RDSEED_EAX
-
-RDSEED_succeeded:
-
- cmp bsize, MWSIZE
- jb Partial_Machine_Word
-
-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 GenerateBlock_Top
-
- ;; 1,2,3 bytes remain
-Partial_Machine_Word:
-
- ;; Test bit 1 to see if size is at least 2
- test bsize, 2
- jz Bit_1_Not_Set
-
- mov WORD PTR [buffer], ax
- shr eax, 16
- add buffer, 2
-
-Bit_1_Not_Set:
-
- ;; Test bit 0 to see if size is at least 1
- test bsize, 1
- jz Bit_0_Not_Set
-
- mov BYTE PTR [buffer], al
-
-Bit_0_Not_Set:
-
- ;; We've hit all the bits
-
-GenerateBlock_Return:
-
- ;; Clear artifacts
- xor eax, eax
- ret
-
-MASM_RDSEED_GenerateBlock ENDP
-
-ENDIF ;; _M_X86
+ jb RDRAND_Partial_Machine_Word
-OPTION PROLOGUE:PrologueDef
-OPTION EPILOGUE:EpilogueDef
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
-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
-GenerateBlock_Top:
-
- ;; Check remaining size
- cmp bsize, 0
- je GenerateBlock_Return
-
-Call_RDSEED_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 Call_RDSEED_RAX
-
-RDSEED_succeeded:
-
- cmp bsize, MWSIZE
- jb Partial_Machine_Word
-
-Full_Machine_Word:
+RDRAND_Full_Machine_Word:
mov QWORD PTR [buffer], rax
add buffer, MWSIZE
sub bsize, MWSIZE
;; Continue
- jmp GenerateBlock_Top
+ jmp RDRAND_GenerateBlock_Top
;; 1,2,3,4,5,6,7 bytes remain
-Partial_Machine_Word:
+RDRAND_Partial_Machine_Word:
;; Test bit 2 to see if size is at least 4
test bsize, 4
- jz Bit_2_Not_Set
+ jz RDRAND_Bit_2_Not_Set
mov DWORD PTR [buffer], eax
shr rax, 32
add buffer, 4
-Bit_2_Not_Set:
+RDRAND_Bit_2_Not_Set:
;; Test bit 1 to see if size is at least 2
test bsize, 2
- jz Bit_1_Not_Set
+ jz RDRAND_Bit_1_Not_Set
mov WORD PTR [buffer], ax
shr eax, 16
add buffer, 2
-Bit_1_Not_Set:
+RDRAND_Bit_1_Not_Set:
;; Test bit 0 to see if size is at least 1
test bsize, 1
- jz Bit_0_Not_Set
+ jz RDRAND_Bit_0_Not_Set
mov BYTE PTR [buffer], al
+ ;; shr ax, 8
+ ;; add buffer, 1
-Bit_0_Not_Set:
+RDRAND_Bit_0_Not_Set:
;; We've hit all the bits
-GenerateBlock_Return:
+RDRAND_GenerateBlock_Return:
;; Clear artifacts
xor rax, rax
ret
-MASM_RDSEED_GenerateBlock ENDP
+MASM_RDRAND_GenerateBlock ENDP
ENDIF ;; _M_X64
-OPTION PROLOGUE:PrologueDef
-OPTION EPILOGUE:EpilogueDef
-
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;