summaryrefslogtreecommitdiff
path: root/arch/x86/crypto/aesni-intel_asm.S
diff options
context:
space:
mode:
authorDave Watson <davejwatson@fb.com>2018-02-14 20:40:19 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2018-02-22 17:16:49 +0300
commitae952c5ec655b2b8bb337acb554d53481b0e01bc (patch)
treeef96fbbe5a3a2edfb7d96bf89e874cc1f74f1aa2 /arch/x86/crypto/aesni-intel_asm.S
parent1476db2d129d5e4fc59e93a7abd22edcb26b52f5 (diff)
downloadlinux-ae952c5ec655b2b8bb337acb554d53481b0e01bc.tar.xz
crypto: aesni - Introduce partial block macro
Before this diff, multiple calls to GCM_ENC_DEC will succeed, but only if all calls are a multiple of 16 bytes. Handle partial blocks at the start of GCM_ENC_DEC, and update aadhash as appropriate. The data offset %r11 is also updated after the partial block. Signed-off-by: Dave Watson <davejwatson@fb.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'arch/x86/crypto/aesni-intel_asm.S')
-rw-r--r--arch/x86/crypto/aesni-intel_asm.S151
1 files changed, 150 insertions, 1 deletions
diff --git a/arch/x86/crypto/aesni-intel_asm.S b/arch/x86/crypto/aesni-intel_asm.S
index af9013401387..760a5174e308 100644
--- a/arch/x86/crypto/aesni-intel_asm.S
+++ b/arch/x86/crypto/aesni-intel_asm.S
@@ -285,7 +285,13 @@ ALL_F: .octa 0xffffffffffffffffffffffffffffffff
movdqu AadHash(%arg2), %xmm8
movdqu HashKey(%arg2), %xmm13
add %arg5, InLen(%arg2)
+
+ xor %r11, %r11 # initialise the data pointer offset as zero
+ PARTIAL_BLOCK %arg3 %arg4 %arg5 %r11 %xmm8 \operation
+
+ sub %r11, %arg5 # sub partial block data used
mov %arg5, %r13 # save the number of bytes
+
and $-16, %r13 # %r13 = %r13 - (%r13 mod 16)
mov %r13, %r12
# Encrypt/Decrypt first few blocks
@@ -606,6 +612,150 @@ _get_AAD_done\@:
movdqu \TMP6, AadHash(%arg2)
.endm
+# PARTIAL_BLOCK: Handles encryption/decryption and the tag partial blocks
+# between update calls.
+# Requires the input data be at least 1 byte long due to READ_PARTIAL_BLOCK
+# Outputs encrypted bytes, and updates hash and partial info in gcm_data_context
+# Clobbers rax, r10, r12, r13, xmm0-6, xmm9-13
+.macro PARTIAL_BLOCK CYPH_PLAIN_OUT PLAIN_CYPH_IN PLAIN_CYPH_LEN DATA_OFFSET \
+ AAD_HASH operation
+ mov PBlockLen(%arg2), %r13
+ cmp $0, %r13
+ je _partial_block_done_\@ # Leave Macro if no partial blocks
+ # Read in input data without over reading
+ cmp $16, \PLAIN_CYPH_LEN
+ jl _fewer_than_16_bytes_\@
+ movups (\PLAIN_CYPH_IN), %xmm1 # If more than 16 bytes, just fill xmm
+ jmp _data_read_\@
+
+_fewer_than_16_bytes_\@:
+ lea (\PLAIN_CYPH_IN, \DATA_OFFSET, 1), %r10
+ mov \PLAIN_CYPH_LEN, %r12
+ READ_PARTIAL_BLOCK %r10 %r12 %xmm0 %xmm1
+
+ mov PBlockLen(%arg2), %r13
+
+_data_read_\@: # Finished reading in data
+
+ movdqu PBlockEncKey(%arg2), %xmm9
+ movdqu HashKey(%arg2), %xmm13
+
+ lea SHIFT_MASK(%rip), %r12
+
+ # adjust the shuffle mask pointer to be able to shift r13 bytes
+ # r16-r13 is the number of bytes in plaintext mod 16)
+ add %r13, %r12
+ movdqu (%r12), %xmm2 # get the appropriate shuffle mask
+ PSHUFB_XMM %xmm2, %xmm9 # shift right r13 bytes
+
+.ifc \operation, dec
+ movdqa %xmm1, %xmm3
+ pxor %xmm1, %xmm9 # Cyphertext XOR E(K, Yn)
+
+ mov \PLAIN_CYPH_LEN, %r10
+ add %r13, %r10
+ # Set r10 to be the amount of data left in CYPH_PLAIN_IN after filling
+ sub $16, %r10
+ # Determine if if partial block is not being filled and
+ # shift mask accordingly
+ jge _no_extra_mask_1_\@
+ sub %r10, %r12
+_no_extra_mask_1_\@:
+
+ movdqu ALL_F-SHIFT_MASK(%r12), %xmm1
+ # get the appropriate mask to mask out bottom r13 bytes of xmm9
+ pand %xmm1, %xmm9 # mask out bottom r13 bytes of xmm9
+
+ pand %xmm1, %xmm3
+ movdqa SHUF_MASK(%rip), %xmm10
+ PSHUFB_XMM %xmm10, %xmm3
+ PSHUFB_XMM %xmm2, %xmm3
+ pxor %xmm3, \AAD_HASH
+
+ cmp $0, %r10
+ jl _partial_incomplete_1_\@
+
+ # GHASH computation for the last <16 Byte block
+ GHASH_MUL \AAD_HASH, %xmm13, %xmm0, %xmm10, %xmm11, %xmm5, %xmm6
+ xor %rax,%rax
+
+ mov %rax, PBlockLen(%arg2)
+ jmp _dec_done_\@
+_partial_incomplete_1_\@:
+ add \PLAIN_CYPH_LEN, PBlockLen(%arg2)
+_dec_done_\@:
+ movdqu \AAD_HASH, AadHash(%arg2)
+.else
+ pxor %xmm1, %xmm9 # Plaintext XOR E(K, Yn)
+
+ mov \PLAIN_CYPH_LEN, %r10
+ add %r13, %r10
+ # Set r10 to be the amount of data left in CYPH_PLAIN_IN after filling
+ sub $16, %r10
+ # Determine if if partial block is not being filled and
+ # shift mask accordingly
+ jge _no_extra_mask_2_\@
+ sub %r10, %r12
+_no_extra_mask_2_\@:
+
+ movdqu ALL_F-SHIFT_MASK(%r12), %xmm1
+ # get the appropriate mask to mask out bottom r13 bytes of xmm9
+ pand %xmm1, %xmm9
+
+ movdqa SHUF_MASK(%rip), %xmm1
+ PSHUFB_XMM %xmm1, %xmm9
+ PSHUFB_XMM %xmm2, %xmm9
+ pxor %xmm9, \AAD_HASH
+
+ cmp $0, %r10
+ jl _partial_incomplete_2_\@
+
+ # GHASH computation for the last <16 Byte block
+ GHASH_MUL \AAD_HASH, %xmm13, %xmm0, %xmm10, %xmm11, %xmm5, %xmm6
+ xor %rax,%rax
+
+ mov %rax, PBlockLen(%arg2)
+ jmp _encode_done_\@
+_partial_incomplete_2_\@:
+ add \PLAIN_CYPH_LEN, PBlockLen(%arg2)
+_encode_done_\@:
+ movdqu \AAD_HASH, AadHash(%arg2)
+
+ movdqa SHUF_MASK(%rip), %xmm10
+ # shuffle xmm9 back to output as ciphertext
+ PSHUFB_XMM %xmm10, %xmm9
+ PSHUFB_XMM %xmm2, %xmm9
+.endif
+ # output encrypted Bytes
+ cmp $0, %r10
+ jl _partial_fill_\@
+ mov %r13, %r12
+ mov $16, %r13
+ # Set r13 to be the number of bytes to write out
+ sub %r12, %r13
+ jmp _count_set_\@
+_partial_fill_\@:
+ mov \PLAIN_CYPH_LEN, %r13
+_count_set_\@:
+ movdqa %xmm9, %xmm0
+ MOVQ_R64_XMM %xmm0, %rax
+ cmp $8, %r13
+ jle _less_than_8_bytes_left_\@
+
+ mov %rax, (\CYPH_PLAIN_OUT, \DATA_OFFSET, 1)
+ add $8, \DATA_OFFSET
+ psrldq $8, %xmm0
+ MOVQ_R64_XMM %xmm0, %rax
+ sub $8, %r13
+_less_than_8_bytes_left_\@:
+ movb %al, (\CYPH_PLAIN_OUT, \DATA_OFFSET, 1)
+ add $1, \DATA_OFFSET
+ shr $8, %rax
+ sub $1, %r13
+ jne _less_than_8_bytes_left_\@
+_partial_block_done_\@:
+.endm # PARTIAL_BLOCK
+
/*
* if a = number of total plaintext bytes
* b = floor(a/16)
@@ -624,7 +774,6 @@ _get_AAD_done\@:
movdqu AadHash(%arg2), %xmm\i # XMM0 = Y0
- xor %r11, %r11 # initialise the data pointer offset as zero
# start AES for num_initial_blocks blocks
movdqu CurCount(%arg2), \XMM0 # XMM0 = Y0