AAD hash only needs to be calculated once for each scatter/gather operation.
Move it to its own macro, and call it from GCM_INIT instead of
INITIAL_BLOCKS.
Signed-off-by: Dave Watson <[email protected]>
---
arch/x86/crypto/aesni-intel_asm.S | 71 ++++++++++++++++++++++++---------------
1 file changed, 43 insertions(+), 28 deletions(-)
diff --git a/arch/x86/crypto/aesni-intel_asm.S b/arch/x86/crypto/aesni-intel_asm.S
index 6c5a80d..58bbfac 100644
--- a/arch/x86/crypto/aesni-intel_asm.S
+++ b/arch/x86/crypto/aesni-intel_asm.S
@@ -229,6 +229,10 @@ ALL_F: .octa 0xffffffffffffffffffffffffffffffff
mov %arg5, %r13 # %xmm13 holds HashKey<<1 (mod poly)
and $-16, %r13
mov %r13, %r12
+
+ CALC_AAD_HASH %xmm13 %xmm0 %xmm1 %xmm2 %xmm3 %xmm4 \
+ %xmm5 %xmm6
+ mov %r13, %r12
.endm
# GCM_ENC_DEC Encodes/Decodes given data. Assumes that the passed gcm_context
@@ -496,51 +500,62 @@ _read_next_byte_lt8_\@:
_done_read_partial_block_\@:
.endm
-/*
-* if a = number of total plaintext bytes
-* b = floor(a/16)
-* num_initial_blocks = b mod 4
-* encrypt the initial num_initial_blocks blocks and apply ghash on
-* the ciphertext
-* %r10, %r11, %r12, %rax, %xmm5, %xmm6, %xmm7, %xmm8, %xmm9 registers
-* are clobbered
-* arg1, %arg3, %arg4, %r14 are used as a pointer only, not modified
-*/
-
-
-.macro INITIAL_BLOCKS_ENC_DEC TMP1 TMP2 TMP3 TMP4 TMP5 XMM0 XMM1 \
-XMM2 XMM3 XMM4 XMMDst TMP6 TMP7 i i_seq operation
- MOVADQ SHUF_MASK(%rip), %xmm14
- mov arg8, %r10 # %r10 = AAD
- mov arg9, %r11 # %r11 = aadLen
- pxor %xmm\i, %xmm\i
- pxor \XMM2, \XMM2
+# CALC_AAD_HASH: Calculates the hash of the data which will not be encrypted.
+# clobbers r10-11, xmm14
+.macro CALC_AAD_HASH HASHKEY TMP1 TMP2 TMP3 TMP4 TMP5 \
+ TMP6 TMP7
+ MOVADQ SHUF_MASK(%rip), %xmm14
+ mov arg8, %r10 # %r10 = AAD
+ mov arg9, %r11 # %r11 = aadLen
+ pxor \TMP7, \TMP7
+ pxor \TMP6, \TMP6
cmp $16, %r11
jl _get_AAD_rest\@
_get_AAD_blocks\@:
- movdqu (%r10), %xmm\i
- PSHUFB_XMM %xmm14, %xmm\i # byte-reflect the AAD data
- pxor %xmm\i, \XMM2
- GHASH_MUL \XMM2, \TMP3, \TMP1, \TMP2, \TMP4, \TMP5, \XMM1
+ movdqu (%r10), \TMP7
+ PSHUFB_XMM %xmm14, \TMP7 # byte-reflect the AAD data
+ pxor \TMP7, \TMP6
+ GHASH_MUL \TMP6, \HASHKEY, \TMP1, \TMP2, \TMP3, \TMP4, \TMP5
add $16, %r10
sub $16, %r11
cmp $16, %r11
jge _get_AAD_blocks\@
- movdqu \XMM2, %xmm\i
+ movdqu \TMP6, \TMP7
/* read the last <16B of AAD */
_get_AAD_rest\@:
cmp $0, %r11
je _get_AAD_done\@
- READ_PARTIAL_BLOCK %r10, %r11, \TMP1, %xmm\i
- PSHUFB_XMM %xmm14, %xmm\i # byte-reflect the AAD data
- pxor \XMM2, %xmm\i
- GHASH_MUL %xmm\i, \TMP3, \TMP1, \TMP2, \TMP4, \TMP5, \XMM1
+ READ_PARTIAL_BLOCK %r10, %r11, \TMP1, \TMP7
+ PSHUFB_XMM %xmm14, \TMP7 # byte-reflect the AAD data
+ pxor \TMP6, \TMP7
+ GHASH_MUL \TMP7, \HASHKEY, \TMP1, \TMP2, \TMP3, \TMP4, \TMP5
+ movdqu \TMP7, \TMP6
_get_AAD_done\@:
+ movdqu \TMP6, AadHash(%arg2)
+.endm
+
+/*
+* if a = number of total plaintext bytes
+* b = floor(a/16)
+* num_initial_blocks = b mod 4
+* encrypt the initial num_initial_blocks blocks and apply ghash on
+* the ciphertext
+* %r10, %r11, %r12, %rax, %xmm5, %xmm6, %xmm7, %xmm8, %xmm9 registers
+* are clobbered
+* arg1, %arg2, %arg3, %r14 are used as a pointer only, not modified
+*/
+
+
+.macro INITIAL_BLOCKS_ENC_DEC TMP1 TMP2 TMP3 TMP4 TMP5 XMM0 XMM1 \
+ XMM2 XMM3 XMM4 XMMDst TMP6 TMP7 i i_seq operation
+
+ movdqu AadHash(%arg2), %xmm\i # XMM0 = Y0
+
xor %r11, %r11 # initialise the data pointer offset as zero
# start AES for num_initial_blocks blocks
--
2.9.5