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authorlloyd <[email protected]>2006-08-21 04:41:10 +0000
committerlloyd <[email protected]>2006-08-21 04:41:10 +0000
commit0cbbd70d84cd9592f503ab4879de8392e5ad6370 (patch)
tree6a1d4412c54948e8e5fd1aca42e707160b621a4c /modules/alg_ia32/sha1core.S
parent98c14509534dc916f698b17d8f23bab922dff143 (diff)
Inside the compression function, store the original stack pointer in the
W array, and then use %esp to point to the message words. This gives an extra register for temporary usage.
Diffstat (limited to 'modules/alg_ia32/sha1core.S')
-rw-r--r--modules/alg_ia32/sha1core.S62
1 files changed, 36 insertions, 26 deletions
diff --git a/modules/alg_ia32/sha1core.S b/modules/alg_ia32/sha1core.S
index c37ff205b..2701438be 100644
--- a/modules/alg_ia32/sha1core.S
+++ b/modules/alg_ia32/sha1core.S
@@ -84,50 +84,56 @@ LOOP_UNTIL_EQ(ESI, 80, .EXPANSION)
ASSIGN(EDX, ARRAY4(EDI, 3))
ASSIGN(ESI, ARRAY4(EDI, 4))
+ ASSIGN(ARRAY4(EBP, 80), ESP)
+ ASSIGN(ESP, EBP)
+
#define MAGIC1 0x5A827999
#define MAGIC2 0x6ED9EBA1
#define MAGIC3 0x8F1BBCDC
#define MAGIC4 0xCA62C1D6
-#define MSG EBP
+#define MSG ESP
+#define T2 EBP
#define F1(A, B, C, D, E, F, N) \
- ASSIGN(F, A) ; \
+ ASSIGN(T2, ARRAY4(MSG, N)) ; \
+ ASSIGN(A, F) ; \
ROTL_IMM(F, 5) ; \
ADD(F, E) ; \
ASSIGN(E, C) ; \
XOR(E, D) ; \
- ADD(F, ARRAY4(MSG, N)) ; \
+ ADD3_IMM(F, T2, MAGIC1) ; \
AND(E, B) ; \
XOR(E, D) ; \
ROTR_IMM(B, 2) ; \
- ADD3_IMM(F, E, MAGIC1) ;
+ ADD(E, F) ;
#define F2_4(A, B, C, D, E, F, N, MAGIC) \
- ASSIGN(F, A) ; \
+ ASSIGN(T2, ARRAY4(MSG, N)) ; \
+ ASSIGN(A, F) ; \
ROTL_IMM(F, 5) ; \
ADD(F, E) ; \
ASSIGN(E, B) ; \
- ADD(F, ARRAY4(MSG, N)) ; \
XOR(E, C) ; \
- ROTR_IMM(B, 2) ; \
+ ADD3_IMM(F, T2, MAGIC) ; \
XOR(E, D) ; \
- ADD3_IMM(F, E, MAGIC) ; \
+ ROTR_IMM(B, 2) ; \
+ ADD(E, F) ;
#define F3(A, B, C, D, E, F, N) \
- ASSIGN(F, B) ; \
- OR(F, C) ; \
- AND(F, D) ; \
- ASSIGN(MSG, B) ; \
- ROTR_IMM(B, 2) ; \
- AND(MSG, C) ; \
- OR(F, MSG) ; \
- ASSIGN(MSG, ARG(3)) ; \
+ ASSIGN(T2, ARRAY4(MSG, N)) ; \
+ ASSIGN(A, F) ; \
+ ROTL_IMM(F, 5) ; \
ADD(F, E) ; \
- ASSIGN(E, A) ; \
- ROTL_IMM(E, 5) ; \
- ADD3_IMM(F, E, MAGIC3) ; \
- ADD(F, ARRAY4(MSG, N)) ; \
+ ASSIGN(E, B) ; \
+ OR(E, C) ; \
+ AND(E, D) ; \
+ ADD3_IMM(F, T2, MAGIC3) ; \
+ ASSIGN(T2, B) ; \
+ AND(T2, C) ; \
+ OR(E, T2) ; \
+ ROTR_IMM(B, 2) ; \
+ ADD(E, F) ;
#define F2(A, B, C, D, E, F, MSG) \
F2_4(A, B, C, D, E, F, MSG, MAGIC2)
@@ -135,6 +141,8 @@ LOOP_UNTIL_EQ(ESI, 80, .EXPANSION)
#define F4(A, B, C, D, E, F, MSG) \
F2_4(A, B, C, D, E, F, MSG, MAGIC4)
+ ASSIGN(EDI, EAX)
+
/* First Round */
F1(EAX, EBX, ECX, EDX, ESI, EDI, 0)
F1(EDI, EAX, EBX, ECX, EDX, ESI, 1)
@@ -223,12 +231,14 @@ LOOP_UNTIL_EQ(ESI, 80, .EXPANSION)
F4(EAX, EBX, ECX, EDX, ESI, EDI, 78)
F4(EDI, EAX, EBX, ECX, EDX, ESI, 79)
- ASSIGN(EDX, ARG(1))
- ADD(ARRAY4(EDX, 0), ESI)
- ADD(ARRAY4(EDX, 1), EDI)
- ADD(ARRAY4(EDX, 2), EAX)
- ADD(ARRAY4(EDX, 3), EBX)
- ADD(ARRAY4(EDX, 4), ECX)
+ ASSIGN(ESP, ARRAY4(ESP, 80))
+
+ ASSIGN(EBP, ARG(1))
+ ADD(ARRAY4(EBP, 0), EDX)
+ ADD(ARRAY4(EBP, 1), EDI)
+ ADD(ARRAY4(EBP, 2), EAX)
+ ADD(ARRAY4(EBP, 3), EBX)
+ ADD(ARRAY4(EBP, 4), ECX)
RESTORE_REGS()
END_FUNCTION(sha160_core)