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crypto: aesni - Split AAD hash calculation to separate macro 

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 <davejwatson@fb.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Dave Watson 2018-02-14 09:39:36 -08:00 committed by Herbert Xu
parent 9ee4a5df22
commit c594c54085
1 changed files with 46 additions and 31 deletions
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77
arch/x86/crypto/aesni-intel_asm.S
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@ -230,6 +230,10 @@ 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
@ -497,6 +501,45 @@ _read_next_byte_lt8_\@:
_done_read_partial_block_\@:
.endm
# 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), \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 \TMP6, \TMP7
/* read the last <16B of AAD */
_get_AAD_rest\@:
cmp $0, %r11
je _get_AAD_done\@
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)
@ -505,43 +548,15 @@ _done_read_partial_block_\@:
* 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
* 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
MOVADQ SHUF_MASK(%rip), %xmm14
mov arg8, %r10 # %r10 = AAD
mov arg9, %r11 # %r11 = aadLen
pxor %xmm\i, %xmm\i
pxor \XMM2, \XMM2
XMM2 XMM3 XMM4 XMMDst TMP6 TMP7 i i_seq operation
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
add $16, %r10
sub $16, %r11
cmp $16, %r11
jge _get_AAD_blocks\@
movdqu AadHash(%arg2), %xmm\i # XMM0 = Y0
movdqu \XMM2, %xmm\i
/* 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
_get_AAD_done\@:
xor %r11, %r11 # initialise the data pointer offset as zero
# start AES for num_initial_blocks blocks