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-rw-r--r--arch/x86/crypto/aesni-intel_asm.S1192
1 files changed, 1192 insertions, 0 deletions
diff --git a/arch/x86/crypto/aesni-intel_asm.S b/arch/x86/crypto/aesni-intel_asm.S
index ff16756a51c1..aafced54df64 100644
--- a/arch/x86/crypto/aesni-intel_asm.S
+++ b/arch/x86/crypto/aesni-intel_asm.S
@@ -9,6 +9,17 @@
* Vinodh Gopal <vinodh.gopal@intel.com>
* Kahraman Akdemir
*
+ * Added RFC4106 AES-GCM support for 128-bit keys under the AEAD
+ * interface for 64-bit kernels.
+ * Authors: Erdinc Ozturk (erdinc.ozturk@intel.com)
+ * Aidan O'Mahony (aidan.o.mahony@intel.com)
+ * Adrian Hoban <adrian.hoban@intel.com>
+ * James Guilford (james.guilford@intel.com)
+ * Gabriele Paoloni <gabriele.paoloni@intel.com>
+ * Tadeusz Struk (tadeusz.struk@intel.com)
+ * Wajdi Feghali (wajdi.k.feghali@intel.com)
+ * Copyright (c) 2010, Intel Corporation.
+ *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
@@ -18,8 +29,60 @@
#include <linux/linkage.h>
#include <asm/inst.h>
+.data
+POLY: .octa 0xC2000000000000000000000000000001
+TWOONE: .octa 0x00000001000000000000000000000001
+
+# order of these constants should not change.
+# more specifically, ALL_F should follow SHIFT_MASK,
+# and ZERO should follow ALL_F
+
+SHUF_MASK: .octa 0x000102030405060708090A0B0C0D0E0F
+MASK1: .octa 0x0000000000000000ffffffffffffffff
+MASK2: .octa 0xffffffffffffffff0000000000000000
+SHIFT_MASK: .octa 0x0f0e0d0c0b0a09080706050403020100
+ALL_F: .octa 0xffffffffffffffffffffffffffffffff
+ZERO: .octa 0x00000000000000000000000000000000
+ONE: .octa 0x00000000000000000000000000000001
+F_MIN_MASK: .octa 0xf1f2f3f4f5f6f7f8f9fafbfcfdfeff0
+dec: .octa 0x1
+enc: .octa 0x2
+
+
.text
+
+#define STACK_OFFSET 8*3
+#define HashKey 16*0 // store HashKey <<1 mod poly here
+#define HashKey_2 16*1 // store HashKey^2 <<1 mod poly here
+#define HashKey_3 16*2 // store HashKey^3 <<1 mod poly here
+#define HashKey_4 16*3 // store HashKey^4 <<1 mod poly here
+#define HashKey_k 16*4 // store XOR of High 64 bits and Low 64
+ // bits of HashKey <<1 mod poly here
+ //(for Karatsuba purposes)
+#define HashKey_2_k 16*5 // store XOR of High 64 bits and Low 64
+ // bits of HashKey^2 <<1 mod poly here
+ // (for Karatsuba purposes)
+#define HashKey_3_k 16*6 // store XOR of High 64 bits and Low 64
+ // bits of HashKey^3 <<1 mod poly here
+ // (for Karatsuba purposes)
+#define HashKey_4_k 16*7 // store XOR of High 64 bits and Low 64
+ // bits of HashKey^4 <<1 mod poly here
+ // (for Karatsuba purposes)
+#define VARIABLE_OFFSET 16*8
+
+#define arg1 rdi
+#define arg2 rsi
+#define arg3 rdx
+#define arg4 rcx
+#define arg5 r8
+#define arg6 r9
+#define arg7 STACK_OFFSET+8(%r14)
+#define arg8 STACK_OFFSET+16(%r14)
+#define arg9 STACK_OFFSET+24(%r14)
+#define arg10 STACK_OFFSET+32(%r14)
+
+
#define STATE1 %xmm0
#define STATE2 %xmm4
#define STATE3 %xmm5
@@ -47,6 +110,1135 @@
#define T2 %r11
#define TCTR_LOW T2
+
+/* GHASH_MUL MACRO to implement: Data*HashKey mod (128,127,126,121,0)
+*
+*
+* Input: A and B (128-bits each, bit-reflected)
+* Output: C = A*B*x mod poly, (i.e. >>1 )
+* To compute GH = GH*HashKey mod poly, give HK = HashKey<<1 mod poly as input
+* GH = GH * HK * x mod poly which is equivalent to GH*HashKey mod poly.
+*
+*/
+.macro GHASH_MUL GH HK TMP1 TMP2 TMP3 TMP4 TMP5
+ movdqa \GH, \TMP1
+ pshufd $78, \GH, \TMP2
+ pshufd $78, \HK, \TMP3
+ pxor \GH, \TMP2 # TMP2 = a1+a0
+ pxor \HK, \TMP3 # TMP3 = b1+b0
+ PCLMULQDQ 0x11, \HK, \TMP1 # TMP1 = a1*b1
+ PCLMULQDQ 0x00, \HK, \GH # GH = a0*b0
+ PCLMULQDQ 0x00, \TMP3, \TMP2 # TMP2 = (a0+a1)*(b1+b0)
+ pxor \GH, \TMP2
+ pxor \TMP1, \TMP2 # TMP2 = (a0*b0)+(a1*b0)
+ movdqa \TMP2, \TMP3
+ pslldq $8, \TMP3 # left shift TMP3 2 DWs
+ psrldq $8, \TMP2 # right shift TMP2 2 DWs
+ pxor \TMP3, \GH
+ pxor \TMP2, \TMP1 # TMP2:GH holds the result of GH*HK
+
+ # first phase of the reduction
+
+ movdqa \GH, \TMP2
+ movdqa \GH, \TMP3
+ movdqa \GH, \TMP4 # copy GH into TMP2,TMP3 and TMP4
+ # in in order to perform
+ # independent shifts
+ pslld $31, \TMP2 # packed right shift <<31
+ pslld $30, \TMP3 # packed right shift <<30
+ pslld $25, \TMP4 # packed right shift <<25
+ pxor \TMP3, \TMP2 # xor the shifted versions
+ pxor \TMP4, \TMP2
+ movdqa \TMP2, \TMP5
+ psrldq $4, \TMP5 # right shift TMP5 1 DW
+ pslldq $12, \TMP2 # left shift TMP2 3 DWs
+ pxor \TMP2, \GH
+
+ # second phase of the reduction
+
+ movdqa \GH,\TMP2 # copy GH into TMP2,TMP3 and TMP4
+ # in in order to perform
+ # independent shifts
+ movdqa \GH,\TMP3
+ movdqa \GH,\TMP4
+ psrld $1,\TMP2 # packed left shift >>1
+ psrld $2,\TMP3 # packed left shift >>2
+ psrld $7,\TMP4 # packed left shift >>7
+ pxor \TMP3,\TMP2 # xor the shifted versions
+ pxor \TMP4,\TMP2
+ pxor \TMP5, \TMP2
+ pxor \TMP2, \GH
+ pxor \TMP1, \GH # result is in TMP1
+.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 num_initial_blocks TMP1 TMP2 TMP3 TMP4 TMP5 XMM0 XMM1 \
+XMM2 XMM3 XMM4 XMMDst TMP6 TMP7 i i_seq operation
+
+ mov arg7, %r10 # %r10 = AAD
+ mov arg8, %r12 # %r12 = aadLen
+ mov %r12, %r11
+ pxor %xmm\i, %xmm\i
+_get_AAD_loop\num_initial_blocks\operation:
+ movd (%r10), \TMP1
+ pslldq $12, \TMP1
+ psrldq $4, %xmm\i
+ pxor \TMP1, %xmm\i
+ add $4, %r10
+ sub $4, %r12
+ jne _get_AAD_loop\num_initial_blocks\operation
+ cmp $16, %r11
+ je _get_AAD_loop2_done\num_initial_blocks\operation
+ mov $16, %r12
+_get_AAD_loop2\num_initial_blocks\operation:
+ psrldq $4, %xmm\i
+ sub $4, %r12
+ cmp %r11, %r12
+ jne _get_AAD_loop2\num_initial_blocks\operation
+_get_AAD_loop2_done\num_initial_blocks\operation:
+ pshufb SHUF_MASK(%rip), %xmm\i # byte-reflect the AAD data
+ xor %r11, %r11 # initialise the data pointer offset as zero
+
+ # start AES for num_initial_blocks blocks
+
+ mov %arg5, %rax # %rax = *Y0
+ movdqu (%rax), \XMM0 # XMM0 = Y0
+ pshufb SHUF_MASK(%rip), \XMM0
+.if \i_seq != 0
+.irpc index, \i_seq
+ paddd ONE(%rip), \XMM0 # INCR Y0
+ movdqa \XMM0, %xmm\index
+ pshufb SHUF_MASK(%rip), %xmm\index # perform a 16 byte swap
+.endr
+.irpc index, \i_seq
+ pxor 16*0(%arg1), %xmm\index
+.endr
+.irpc index, \i_seq
+ movaps 0x10(%rdi), \TMP1
+ AESENC \TMP1, %xmm\index # Round 1
+.endr
+.irpc index, \i_seq
+ movaps 0x20(%arg1), \TMP1
+ AESENC \TMP1, %xmm\index # Round 2
+.endr
+.irpc index, \i_seq
+ movaps 0x30(%arg1), \TMP1
+ AESENC \TMP1, %xmm\index # Round 2
+.endr
+.irpc index, \i_seq
+ movaps 0x40(%arg1), \TMP1
+ AESENC \TMP1, %xmm\index # Round 2
+.endr
+.irpc index, \i_seq
+ movaps 0x50(%arg1), \TMP1
+ AESENC \TMP1, %xmm\index # Round 2
+.endr
+.irpc index, \i_seq
+ movaps 0x60(%arg1), \TMP1
+ AESENC \TMP1, %xmm\index # Round 2
+.endr
+.irpc index, \i_seq
+ movaps 0x70(%arg1), \TMP1
+ AESENC \TMP1, %xmm\index # Round 2
+.endr
+.irpc index, \i_seq
+ movaps 0x80(%arg1), \TMP1
+ AESENC \TMP1, %xmm\index # Round 2
+.endr
+.irpc index, \i_seq
+ movaps 0x90(%arg1), \TMP1
+ AESENC \TMP1, %xmm\index # Round 2
+.endr
+.irpc index, \i_seq
+ movaps 0xa0(%arg1), \TMP1
+ AESENCLAST \TMP1, %xmm\index # Round 10
+.endr
+.irpc index, \i_seq
+ movdqu (%arg3 , %r11, 1), \TMP1
+ pxor \TMP1, %xmm\index
+ movdqu %xmm\index, (%arg2 , %r11, 1)
+ # write back plaintext/ciphertext for num_initial_blocks
+ add $16, %r11
+.if \operation == dec
+ movdqa \TMP1, %xmm\index
+.endif
+ pshufb SHUF_MASK(%rip), %xmm\index
+ # prepare plaintext/ciphertext for GHASH computation
+.endr
+.endif
+ GHASH_MUL %xmm\i, \TMP3, \TMP1, \TMP2, \TMP4, \TMP5, \XMM1
+ # apply GHASH on num_initial_blocks blocks
+
+.if \i == 5
+ pxor %xmm5, %xmm6
+ GHASH_MUL %xmm6, \TMP3, \TMP1, \TMP2, \TMP4, \TMP5, \XMM1
+ pxor %xmm6, %xmm7
+ GHASH_MUL %xmm7, \TMP3, \TMP1, \TMP2, \TMP4, \TMP5, \XMM1
+ pxor %xmm7, %xmm8
+ GHASH_MUL %xmm8, \TMP3, \TMP1, \TMP2, \TMP4, \TMP5, \XMM1
+.elseif \i == 6
+ pxor %xmm6, %xmm7
+ GHASH_MUL %xmm7, \TMP3, \TMP1, \TMP2, \TMP4, \TMP5, \XMM1
+ pxor %xmm7, %xmm8
+ GHASH_MUL %xmm8, \TMP3, \TMP1, \TMP2, \TMP4, \TMP5, \XMM1
+.elseif \i == 7
+ pxor %xmm7, %xmm8
+ GHASH_MUL %xmm8, \TMP3, \TMP1, \TMP2, \TMP4, \TMP5, \XMM1
+.endif
+ cmp $64, %r13
+ jl _initial_blocks_done\num_initial_blocks\operation
+ # no need for precomputed values
+/*
+*
+* Precomputations for HashKey parallel with encryption of first 4 blocks.
+* Haskey_i_k holds XORed values of the low and high parts of the Haskey_i
+*/
+ paddd ONE(%rip), \XMM0 # INCR Y0
+ movdqa \XMM0, \XMM1
+ pshufb SHUF_MASK(%rip), \XMM1 # perform a 16 byte swap
+ paddd ONE(%rip), \XMM0 # INCR Y0
+ movdqa \XMM0, \XMM2
+ pshufb SHUF_MASK(%rip), \XMM2 # perform a 16 byte swap
+ paddd ONE(%rip), \XMM0 # INCR Y0
+ movdqa \XMM0, \XMM3
+ pshufb SHUF_MASK(%rip), \XMM3 # perform a 16 byte swap
+ paddd ONE(%rip), \XMM0 # INCR Y0
+ movdqa \XMM0, \XMM4
+ pshufb SHUF_MASK(%rip), \XMM4 # perform a 16 byte swap
+ pxor 16*0(%arg1), \XMM1
+ pxor 16*0(%arg1), \XMM2
+ pxor 16*0(%arg1), \XMM3
+ pxor 16*0(%arg1), \XMM4
+ movdqa \TMP3, \TMP5
+ pshufd $78, \TMP3, \TMP1
+ pxor \TMP3, \TMP1
+ movdqa \TMP1, HashKey_k(%rsp)
+ GHASH_MUL \TMP5, \TMP3, \TMP1, \TMP2, \TMP4, \TMP6, \TMP7
+# TMP5 = HashKey^2<<1 (mod poly)
+ movdqa \TMP5, HashKey_2(%rsp)
+# HashKey_2 = HashKey^2<<1 (mod poly)
+ pshufd $78, \TMP5, \TMP1
+ pxor \TMP5, \TMP1
+ movdqa \TMP1, HashKey_2_k(%rsp)
+.irpc index, 1234 # do 4 rounds
+ movaps 0x10*\index(%arg1), \TMP1
+ AESENC \TMP1, \XMM1
+ AESENC \TMP1, \XMM2
+ AESENC \TMP1, \XMM3
+ AESENC \TMP1, \XMM4
+.endr
+ GHASH_MUL \TMP5, \TMP3, \TMP1, \TMP2, \TMP4, \TMP6, \TMP7
+# TMP5 = HashKey^3<<1 (mod poly)
+ movdqa \TMP5, HashKey_3(%rsp)
+ pshufd $78, \TMP5, \TMP1
+ pxor \TMP5, \TMP1
+ movdqa \TMP1, HashKey_3_k(%rsp)
+.irpc index, 56789 # do next 5 rounds
+ movaps 0x10*\index(%arg1), \TMP1
+ AESENC \TMP1, \XMM1
+ AESENC \TMP1, \XMM2
+ AESENC \TMP1, \XMM3
+ AESENC \TMP1, \XMM4
+.endr
+ GHASH_MUL \TMP5, \TMP3, \TMP1, \TMP2, \TMP4, \TMP6, \TMP7
+# TMP5 = HashKey^3<<1 (mod poly)
+ movdqa \TMP5, HashKey_4(%rsp)
+ pshufd $78, \TMP5, \TMP1
+ pxor \TMP5, \TMP1
+ movdqa \TMP1, HashKey_4_k(%rsp)
+ movaps 0xa0(%arg1), \TMP2
+ AESENCLAST \TMP2, \XMM1
+ AESENCLAST \TMP2, \XMM2
+ AESENCLAST \TMP2, \XMM3
+ AESENCLAST \TMP2, \XMM4
+ movdqu 16*0(%arg3 , %r11 , 1), \TMP1
+ pxor \TMP1, \XMM1
+.if \operation == dec
+ movdqu \XMM1, 16*0(%arg2 , %r11 , 1)
+ movdqa \TMP1, \XMM1
+.endif
+ movdqu 16*1(%arg3 , %r11 , 1), \TMP1
+ pxor \TMP1, \XMM2
+.if \operation == dec
+ movdqu \XMM2, 16*1(%arg2 , %r11 , 1)
+ movdqa \TMP1, \XMM2
+.endif
+ movdqu 16*2(%arg3 , %r11 , 1), \TMP1
+ pxor \TMP1, \XMM3
+.if \operation == dec
+ movdqu \XMM3, 16*2(%arg2 , %r11 , 1)
+ movdqa \TMP1, \XMM3
+.endif
+ movdqu 16*3(%arg3 , %r11 , 1), \TMP1
+ pxor \TMP1, \XMM4
+.if \operation == dec
+ movdqu \XMM4, 16*3(%arg2 , %r11 , 1)
+ movdqa \TMP1, \XMM4
+.else
+ movdqu \XMM1, 16*0(%arg2 , %r11 , 1)
+ movdqu \XMM2, 16*1(%arg2 , %r11 , 1)
+ movdqu \XMM3, 16*2(%arg2 , %r11 , 1)
+ movdqu \XMM4, 16*3(%arg2 , %r11 , 1)
+.endif
+ add $64, %r11
+ pshufb SHUF_MASK(%rip), \XMM1 # perform a 16 byte swap
+ pxor \XMMDst, \XMM1
+# combine GHASHed value with the corresponding ciphertext
+ pshufb SHUF_MASK(%rip), \XMM2 # perform a 16 byte swap
+ pshufb SHUF_MASK(%rip), \XMM3 # perform a 16 byte swap
+ pshufb SHUF_MASK(%rip), \XMM4 # perform a 16 byte swap
+_initial_blocks_done\num_initial_blocks\operation:
+.endm
+
+/*
+* encrypt 4 blocks at a time
+* ghash the 4 previously encrypted ciphertext blocks
+* arg1, %arg2, %arg3 are used as pointers only, not modified
+* %r11 is the data offset value
+*/
+.macro GHASH_4_ENCRYPT_4_PARALLEL TMP1 TMP2 TMP3 TMP4 TMP5 \
+TMP6 XMM0 XMM1 XMM2 XMM3 XMM4 XMM5 XMM6 XMM7 XMM8 operation
+
+ movdqa \XMM1, \XMM5
+ movdqa \XMM2, \XMM6
+ movdqa \XMM3, \XMM7
+ movdqa \XMM4, \XMM8
+
+ # multiply TMP5 * HashKey using karatsuba
+
+ movdqa \XMM5, \TMP4
+ pshufd $78, \XMM5, \TMP6
+ pxor \XMM5, \TMP6
+ paddd ONE(%rip), \XMM0 # INCR CNT
+ movdqa HashKey_4(%rsp), \TMP5
+ PCLMULQDQ 0x11, \TMP5, \TMP4 # TMP4 = a1*b1
+ movdqa \XMM0, \XMM1
+ paddd ONE(%rip), \XMM0 # INCR CNT
+ movdqa \XMM0, \XMM2
+ paddd ONE(%rip), \XMM0 # INCR CNT
+ movdqa \XMM0, \XMM3
+ paddd ONE(%rip), \XMM0 # INCR CNT
+ movdqa \XMM0, \XMM4
+ pshufb SHUF_MASK(%rip), \XMM1 # perform a 16 byte swap
+ PCLMULQDQ 0x00, \TMP5, \XMM5 # XMM5 = a0*b0
+ pshufb SHUF_MASK(%rip), \XMM2 # perform a 16 byte swap
+ pshufb SHUF_MASK(%rip), \XMM3 # perform a 16 byte swap
+ pshufb SHUF_MASK(%rip), \XMM4 # perform a 16 byte swap
+ pxor (%arg1), \XMM1
+ pxor (%arg1), \XMM2
+ pxor (%arg1), \XMM3
+ pxor (%arg1), \XMM4
+ movdqa HashKey_4_k(%rsp), \TMP5
+ PCLMULQDQ 0x00, \TMP5, \TMP6 # TMP6 = (a1+a0)*(b1+b0)
+ movaps 0x10(%arg1), \TMP1
+ AESENC \TMP1, \XMM1 # Round 1
+ AESENC \TMP1, \XMM2
+ AESENC \TMP1, \XMM3
+ AESENC \TMP1, \XMM4
+ movaps 0x20(%arg1), \TMP1
+ AESENC \TMP1, \XMM1 # Round 2
+ AESENC \TMP1, \XMM2
+ AESENC \TMP1, \XMM3
+ AESENC \TMP1, \XMM4
+ movdqa \XMM6, \TMP1
+ pshufd $78, \XMM6, \TMP2
+ pxor \XMM6, \TMP2
+ movdqa HashKey_3(%rsp), \TMP5
+ PCLMULQDQ 0x11, \TMP5, \TMP1 # TMP1 = a1 * b1
+ movaps 0x30(%arg1), \TMP3
+ AESENC \TMP3, \XMM1 # Round 3
+ AESENC \TMP3, \XMM2
+ AESENC \TMP3, \XMM3
+ AESENC \TMP3, \XMM4
+ PCLMULQDQ 0x00, \TMP5, \XMM6 # XMM6 = a0*b0
+ movaps 0x40(%arg1), \TMP3
+ AESENC \TMP3, \XMM1 # Round 4
+ AESENC \TMP3, \XMM2
+ AESENC \TMP3, \XMM3
+ AESENC \TMP3, \XMM4
+ movdqa HashKey_3_k(%rsp), \TMP5
+ PCLMULQDQ 0x00, \TMP5, \TMP2 # TMP2 = (a1+a0)*(b1+b0)
+ movaps 0x50(%arg1), \TMP3
+ AESENC \TMP3, \XMM1 # Round 5
+ AESENC \TMP3, \XMM2
+ AESENC \TMP3, \XMM3
+ AESENC \TMP3, \XMM4
+ pxor \TMP1, \TMP4
+# accumulate the results in TMP4:XMM5, TMP6 holds the middle part
+ pxor \XMM6, \XMM5
+ pxor \TMP2, \TMP6
+ movdqa \XMM7, \TMP1
+ pshufd $78, \XMM7, \TMP2
+ pxor \XMM7, \TMP2
+ movdqa HashKey_2(%rsp ), \TMP5
+
+ # Multiply TMP5 * HashKey using karatsuba
+
+ PCLMULQDQ 0x11, \TMP5, \TMP1 # TMP1 = a1*b1
+ movaps 0x60(%arg1), \TMP3
+ AESENC \TMP3, \XMM1 # Round 6
+ AESENC \TMP3, \XMM2
+ AESENC \TMP3, \XMM3
+ AESENC \TMP3, \XMM4
+ PCLMULQDQ 0x00, \TMP5, \XMM7 # XMM7 = a0*b0
+ movaps 0x70(%arg1), \TMP3
+ AESENC \TMP3, \XMM1 # Round 7
+ AESENC \TMP3, \XMM2
+ AESENC \TMP3, \XMM3
+ AESENC \TMP3, \XMM4
+ movdqa HashKey_2_k(%rsp), \TMP5
+ PCLMULQDQ 0x00, \TMP5, \TMP2 # TMP2 = (a1+a0)*(b1+b0)
+ movaps 0x80(%arg1), \TMP3
+ AESENC \TMP3, \XMM1 # Round 8
+ AESENC \TMP3, \XMM2
+ AESENC \TMP3, \XMM3
+ AESENC \TMP3, \XMM4
+ pxor \TMP1, \TMP4
+# accumulate the results in TMP4:XMM5, TMP6 holds the middle part
+ pxor \XMM7, \XMM5
+ pxor \TMP2, \TMP6
+
+ # Multiply XMM8 * HashKey
+ # XMM8 and TMP5 hold the values for the two operands
+
+ movdqa \XMM8, \TMP1
+ pshufd $78, \XMM8, \TMP2
+ pxor \XMM8, \TMP2
+ movdqa HashKey(%rsp), \TMP5
+ PCLMULQDQ 0x11, \TMP5, \TMP1 # TMP1 = a1*b1
+ movaps 0x90(%arg1), \TMP3
+ AESENC \TMP3, \XMM1 # Round 9
+ AESENC \TMP3, \XMM2
+ AESENC \TMP3, \XMM3
+ AESENC \TMP3, \XMM4
+ PCLMULQDQ 0x00, \TMP5, \XMM8 # XMM8 = a0*b0
+ movaps 0xa0(%arg1), \TMP3
+ AESENCLAST \TMP3, \XMM1 # Round 10
+ AESENCLAST \TMP3, \XMM2
+ AESENCLAST \TMP3, \XMM3
+ AESENCLAST \TMP3, \XMM4
+ movdqa HashKey_k(%rsp), \TMP5
+ PCLMULQDQ 0x00, \TMP5, \TMP2 # TMP2 = (a1+a0)*(b1+b0)
+ movdqu (%arg3,%r11,1), \TMP3
+ pxor \TMP3, \XMM1 # Ciphertext/Plaintext XOR EK
+.if \operation == dec
+ movdqu \XMM1, (%arg2,%r11,1) # Write to plaintext buffer
+ movdqa \TMP3, \XMM1
+.endif
+ movdqu 16(%arg3,%r11,1), \TMP3
+ pxor \TMP3, \XMM2 # Ciphertext/Plaintext XOR EK
+.if \operation == dec
+ movdqu \XMM2, 16(%arg2,%r11,1) # Write to plaintext buffer
+ movdqa \TMP3, \XMM2
+.endif
+ movdqu 32(%arg3,%r11,1), \TMP3
+ pxor \TMP3, \XMM3 # Ciphertext/Plaintext XOR EK
+.if \operation == dec
+ movdqu \XMM3, 32(%arg2,%r11,1) # Write to plaintext buffer
+ movdqa \TMP3, \XMM3
+.endif
+ movdqu 48(%arg3,%r11,1), \TMP3
+ pxor \TMP3, \XMM4 # Ciphertext/Plaintext XOR EK
+.if \operation == dec
+ movdqu \XMM4, 48(%arg2,%r11,1) # Write to plaintext buffer
+ movdqa \TMP3, \XMM4
+.else
+ movdqu \XMM1, (%arg2,%r11,1) # Write to the ciphertext buffer
+ movdqu \XMM2, 16(%arg2,%r11,1) # Write to the ciphertext buffer
+ movdqu \XMM3, 32(%arg2,%r11,1) # Write to the ciphertext buffer
+ movdqu \XMM4, 48(%arg2,%r11,1) # Write to the ciphertext buffer
+.endif
+ pshufb SHUF_MASK(%rip), \XMM1 # perform a 16 byte swap
+ pshufb SHUF_MASK(%rip), \XMM2 # perform a 16 byte swap
+ pshufb SHUF_MASK(%rip), \XMM3 # perform a 16 byte swap
+ pshufb SHUF_MASK(%rip), \XMM4 # perform a 16 byte sway
+
+ pxor \TMP4, \TMP1
+ pxor \XMM8, \XMM5
+ pxor \TMP6, \TMP2
+ pxor \TMP1, \TMP2
+ pxor \XMM5, \TMP2
+ movdqa \TMP2, \TMP3
+ pslldq $8, \TMP3 # left shift TMP3 2 DWs
+ psrldq $8, \TMP2 # right shift TMP2 2 DWs
+ pxor \TMP3, \XMM5
+ pxor \TMP2, \TMP1 # accumulate the results in TMP1:XMM5
+
+ # first phase of reduction
+
+ movdqa \XMM5, \TMP2
+ movdqa \XMM5, \TMP3
+ movdqa \XMM5, \TMP4
+# move XMM5 into TMP2, TMP3, TMP4 in order to perform shifts independently
+ pslld $31, \TMP2 # packed right shift << 31
+ pslld $30, \TMP3 # packed right shift << 30
+ pslld $25, \TMP4 # packed right shift << 25
+ pxor \TMP3, \TMP2 # xor the shifted versions
+ pxor \TMP4, \TMP2
+ movdqa \TMP2, \TMP5
+ psrldq $4, \TMP5 # right shift T5 1 DW
+ pslldq $12, \TMP2 # left shift T2 3 DWs
+ pxor \TMP2, \XMM5
+
+ # second phase of reduction
+
+ movdqa \XMM5,\TMP2 # make 3 copies of XMM5 into TMP2, TMP3, TMP4
+ movdqa \XMM5,\TMP3
+ movdqa \XMM5,\TMP4
+ psrld $1, \TMP2 # packed left shift >>1
+ psrld $2, \TMP3 # packed left shift >>2
+ psrld $7, \TMP4 # packed left shift >>7
+ pxor \TMP3,\TMP2 # xor the shifted versions
+ pxor \TMP4,\TMP2
+ pxor \TMP5, \TMP2
+ pxor \TMP2, \XMM5
+ pxor \TMP1, \XMM5 # result is in TMP1
+
+ pxor \XMM5, \XMM1
+.endm
+
+/* GHASH the last 4 ciphertext blocks. */
+.macro GHASH_LAST_4 TMP1 TMP2 TMP3 TMP4 TMP5 TMP6 \
+TMP7 XMM1 XMM2 XMM3 XMM4 XMMDst
+
+ # Multiply TMP6 * HashKey (using Karatsuba)
+
+ movdqa \XMM1, \TMP6
+ pshufd $78, \XMM1, \TMP2
+ pxor \XMM1, \TMP2
+ movdqa HashKey_4(%rsp), \TMP5
+ PCLMULQDQ 0x11, \TMP5, \TMP6 # TMP6 = a1*b1
+ PCLMULQDQ 0x00, \TMP5, \XMM1 # XMM1 = a0*b0
+ movdqa HashKey_4_k(%rsp), \TMP4
+ PCLMULQDQ 0x00, \TMP4, \TMP2 # TMP2 = (a1+a0)*(b1+b0)
+ movdqa \XMM1, \XMMDst
+ movdqa \TMP2, \XMM1 # result in TMP6, XMMDst, XMM1
+
+ # Multiply TMP1 * HashKey (using Karatsuba)
+
+ movdqa \XMM2, \TMP1
+ pshufd $78, \XMM2, \TMP2
+ pxor \XMM2, \TMP2
+ movdqa HashKey_3(%rsp), \TMP5
+ PCLMULQDQ 0x11, \TMP5, \TMP1 # TMP1 = a1*b1
+ PCLMULQDQ 0x00, \TMP5, \XMM2 # XMM2 = a0*b0
+ movdqa HashKey_3_k(%rsp), \TMP4
+ PCLMULQDQ 0x00, \TMP4, \TMP2 # TMP2 = (a1+a0)*(b1+b0)
+ pxor \TMP1, \TMP6
+ pxor \XMM2, \XMMDst
+ pxor \TMP2, \XMM1
+# results accumulated in TMP6, XMMDst, XMM1
+
+ # Multiply TMP1 * HashKey (using Karatsuba)
+
+ movdqa \XMM3, \TMP1
+ pshufd $78, \XMM3, \TMP2
+ pxor \XMM3, \TMP2
+ movdqa HashKey_2(%rsp), \TMP5
+ PCLMULQDQ 0x11, \TMP5, \TMP1 # TMP1 = a1*b1
+ PCLMULQDQ 0x00, \TMP5, \XMM3 # XMM3 = a0*b0
+ movdqa HashKey_2_k(%rsp), \TMP4
+ PCLMULQDQ 0x00, \TMP4, \TMP2 # TMP2 = (a1+a0)*(b1+b0)
+ pxor \TMP1, \TMP6
+ pxor \XMM3, \XMMDst
+ pxor \TMP2, \XMM1 # results accumulated in TMP6, XMMDst, XMM1
+
+ # Multiply TMP1 * HashKey (using Karatsuba)
+ movdqa \XMM4, \TMP1
+ pshufd $78, \XMM4, \TMP2
+ pxor \XMM4, \TMP2
+ movdqa HashKey(%rsp), \TMP5
+ PCLMULQDQ 0x11, \TMP5, \TMP1 # TMP1 = a1*b1
+ PCLMULQDQ 0x00, \TMP5, \XMM4 # XMM4 = a0*b0
+ movdqa HashKey_k(%rsp), \TMP4
+ PCLMULQDQ 0x00, \TMP4, \TMP2 # TMP2 = (a1+a0)*(b1+b0)
+ pxor \TMP1, \TMP6
+ pxor \XMM4, \XMMDst
+ pxor \XMM1, \TMP2
+ pxor \TMP6, \TMP2
+ pxor \XMMDst, \TMP2
+ # middle section of the temp results combined as in karatsuba algorithm
+ movdqa \TMP2, \TMP4
+ pslldq $8, \TMP4 # left shift TMP4 2 DWs
+ psrldq $8, \TMP2 # right shift TMP2 2 DWs
+ pxor \TMP4, \XMMDst
+ pxor \TMP2, \TMP6
+# TMP6:XMMDst holds the result of the accumulated carry-less multiplications
+ # first phase of the reduction
+ movdqa \XMMDst, \TMP2
+ movdqa \XMMDst, \TMP3
+ movdqa \XMMDst, \TMP4
+# move XMMDst into TMP2, TMP3, TMP4 in order to perform 3 shifts independently
+ pslld $31, \TMP2 # packed right shifting << 31
+ pslld $30, \TMP3 # packed right shifting << 30
+ pslld $25, \TMP4 # packed right shifting << 25
+ pxor \TMP3, \TMP2 # xor the shifted versions
+ pxor \TMP4, \TMP2
+ movdqa \TMP2, \TMP7
+ psrldq $4, \TMP7 # right shift TMP7 1 DW
+ pslldq $12, \TMP2 # left shift TMP2 3 DWs
+ pxor \TMP2, \XMMDst
+
+ # second phase of the reduction
+ movdqa \XMMDst, \TMP2
+ # make 3 copies of XMMDst for doing 3 shift operations
+ movdqa \XMMDst, \TMP3
+ movdqa \XMMDst, \TMP4
+ psrld $1, \TMP2 # packed left shift >> 1
+ psrld $2, \TMP3 # packed left shift >> 2
+ psrld $7, \TMP4 # packed left shift >> 7
+ pxor \TMP3, \TMP2 # xor the shifted versions
+ pxor \TMP4, \TMP2
+ pxor \TMP7, \TMP2
+ pxor \TMP2, \XMMDst
+ pxor \TMP6, \XMMDst # reduced result is in XMMDst
+.endm
+
+/* Encryption of a single block done*/
+.macro ENCRYPT_SINGLE_BLOCK XMM0 TMP1
+
+ pxor (%arg1), \XMM0
+ movaps 16(%arg1), \TMP1
+ AESENC \TMP1, \XMM0
+ movaps 32(%arg1), \TMP1
+ AESENC \TMP1, \XMM0
+ movaps 48(%arg1), \TMP1
+ AESENC \TMP1, \XMM0
+ movaps 64(%arg1), \TMP1
+ AESENC \TMP1, \XMM0
+ movaps 80(%arg1), \TMP1
+ AESENC \TMP1, \XMM0
+ movaps 96(%arg1), \TMP1
+ AESENC \TMP1, \XMM0
+ movaps 112(%arg1), \TMP1
+ AESENC \TMP1, \XMM0
+ movaps 128(%arg1), \TMP1
+ AESENC \TMP1, \XMM0
+ movaps 144(%arg1), \TMP1
+ AESENC \TMP1, \XMM0
+ movaps 160(%arg1), \TMP1
+ AESENCLAST \TMP1, \XMM0
+.endm
+
+
+/*****************************************************************************
+* void aesni_gcm_dec(void *aes_ctx, // AES Key schedule. Starts on a 16 byte boundary.
+* u8 *out, // Plaintext output. Encrypt in-place is allowed.
+* const u8 *in, // Ciphertext input
+* u64 plaintext_len, // Length of data in bytes for decryption.
+* u8 *iv, // Pre-counter block j0: 4 byte salt (from Security Association)
+* // concatenated with 8 byte Initialisation Vector (from IPSec ESP Payload)
+* // concatenated with 0x00000001. 16-byte aligned pointer.
+* u8 *hash_subkey, // H, the Hash sub key input. Data starts on a 16-byte boundary.
+* const u8 *aad, // Additional Authentication Data (AAD)
+* u64 aad_len, // Length of AAD in bytes. With RFC4106 this is going to be 8 or 12 bytes
+* u8 *auth_tag, // Authenticated Tag output. The driver will compare this to the
+* // given authentication tag and only return the plaintext if they match.
+* u64 auth_tag_len); // Authenticated Tag Length in bytes. Valid values are 16
+* // (most likely), 12 or 8.
+*
+* Assumptions:
+*
+* keys:
+* keys are pre-expanded and aligned to 16 bytes. we are using the first
+* set of 11 keys in the data structure void *aes_ctx
+*
+* iv:
+* 0 1 2 3
+* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | Salt (From the SA) |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | Initialization Vector |
+* | (This is the sequence number from IPSec header) |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | 0x1 |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*
+*
+*
+* AAD:
+* AAD padded to 128 bits with 0
+* for example, assume AAD is a u32 vector
+*
+* if AAD is 8 bytes:
+* AAD[3] = {A0, A1};
+* padded AAD in xmm register = {A1 A0 0 0}
+*
+* 0 1 2 3
+* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | SPI (A1) |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | 32-bit Sequence Number (A0) |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | 0x0 |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*
+* AAD Format with 32-bit Sequence Number
+*
+* if AAD is 12 bytes:
+* AAD[3] = {A0, A1, A2};
+* padded AAD in xmm register = {A2 A1 A0 0}
+*
+* 0 1 2 3
+* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | SPI (A2) |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | 64-bit Extended Sequence Number {A1,A0} |
+* | |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | 0x0 |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*
+* AAD Format with 64-bit Extended Sequence Number
+*
+* aadLen:
+* from the definition of the spec, aadLen can only be 8 or 12 bytes.
+* The code supports 16 too but for other sizes, the code will fail.
+*
+* TLen:
+* from the definition of the spec, TLen can only be 8, 12 or 16 bytes.
+* For other sizes, the code will fail.
+*
+* poly = x^128 + x^127 + x^126 + x^121 + 1
+*
+*****************************************************************************/
+
+ENTRY(aesni_gcm_dec)
+ push %r12
+ push %r13
+ push %r14
+ mov %rsp, %r14
+/*
+* states of %xmm registers %xmm6:%xmm15 not saved
+* all %xmm registers are clobbered
+*/
+ sub $VARIABLE_OFFSET, %rsp
+ and $~63, %rsp # align rsp to 64 bytes
+ mov %arg6, %r12
+ movdqu (%r12), %xmm13 # %xmm13 = HashKey
+ pshufb SHUF_MASK(%rip), %xmm13
+
+# Precompute HashKey<<1 (mod poly) from the hash key (required for GHASH)
+
+ movdqa %xmm13, %xmm2
+ psllq $1, %xmm13
+ psrlq $63, %xmm2
+ movdqa %xmm2, %xmm1
+ pslldq $8, %xmm2
+ psrldq $8, %xmm1
+ por %xmm2, %xmm13
+
+ # Reduction
+
+ pshufd $0x24, %xmm1, %xmm2
+ pcmpeqd TWOONE(%rip), %xmm2
+ pand POLY(%rip), %xmm2
+ pxor %xmm2, %xmm13 # %xmm13 holds the HashKey<<1 (mod poly)
+
+
+ # Decrypt first few blocks
+
+ movdqa %xmm13, HashKey(%rsp) # store HashKey<<1 (mod poly)
+ mov %arg4, %r13 # save the number of bytes of plaintext/ciphertext
+ and $-16, %r13 # %r13 = %r13 - (%r13 mod 16)
+ mov %r13, %r12
+ and $(3<<4), %r12
+ jz _initial_num_blocks_is_0_decrypt
+ cmp $(2<<4), %r12
+ jb _initial_num_blocks_is_1_decrypt
+ je _initial_num_blocks_is_2_decrypt
+_initial_num_blocks_is_3_decrypt:
+ INITIAL_BLOCKS 3, %xmm9, %xmm10, %xmm13, %xmm11, %xmm12, %xmm0, \
+%xmm1, %xmm2, %xmm3, %xmm4, %xmm8, %xmm5, %xmm6, 5, 678, dec
+ sub $48, %r13
+ jmp _initial_blocks_decrypted
+_initial_num_blocks_is_2_decrypt:
+ INITIAL_BLOCKS 2, %xmm9, %xmm10, %xmm13, %xmm11, %xmm12, %xmm0, \
+%xmm1, %xmm2, %xmm3, %xmm4, %xmm8, %xmm5, %xmm6, 6, 78, dec
+ sub $32, %r13
+ jmp _initial_blocks_decrypted
+_initial_num_blocks_is_1_decrypt:
+ INITIAL_BLOCKS 1, %xmm9, %xmm10, %xmm13, %xmm11, %xmm12, %xmm0, \
+%xmm1, %xmm2, %xmm3, %xmm4, %xmm8, %xmm5, %xmm6, 7, 8, dec
+ sub $16, %r13
+ jmp _initial_blocks_decrypted
+_initial_num_blocks_is_0_decrypt:
+ INITIAL_BLOCKS 0, %xmm9, %xmm10, %xmm13, %xmm11, %xmm12, %xmm0, \
+%xmm1, %xmm2, %xmm3, %xmm4, %xmm8, %xmm5, %xmm6, 8, 0, dec
+_initial_blocks_decrypted:
+ cmp $0, %r13
+ je _zero_cipher_left_decrypt
+ sub $64, %r13
+ je _four_cipher_left_decrypt
+_decrypt_by_4:
+ GHASH_4_ENCRYPT_4_PARALLEL %xmm9, %xmm10, %xmm11, %xmm12, %xmm13, \
+%xmm14, %xmm0, %xmm1, %xmm2, %xmm3, %xmm4, %xmm5, %xmm6, %xmm7, %xmm8, dec
+ add $64, %r11
+ sub $64, %r13
+ jne _decrypt_by_4
+_four_cipher_left_decrypt:
+ GHASH_LAST_4 %xmm9, %xmm10, %xmm11, %xmm12, %xmm13, %xmm14, \
+%xmm15, %xmm1, %xmm2, %xmm3, %xmm4, %xmm8
+_zero_cipher_left_decrypt:
+ mov %arg4, %r13
+ and $15, %r13 # %r13 = arg4 (mod 16)
+ je _multiple_of_16_bytes_decrypt
+
+ # Handle the last <16 byte block seperately
+
+ paddd ONE(%rip), %xmm0 # increment CNT to get Yn
+ pshufb SHUF_MASK(%rip), %xmm0
+ ENCRYPT_SINGLE_BLOCK %xmm0, %xmm1 # E(K, Yn)
+ sub $16, %r11
+ add %r13, %r11
+ movdqu (%arg3,%r11,1), %xmm1 # recieve the last <16 byte block
+ lea SHIFT_MASK+16(%rip), %r12
+ sub %r13, %r12
+# adjust the shuffle mask pointer to be able to shift 16-%r13 bytes
+# (%r13 is the number of bytes in plaintext mod 16)
+ movdqu (%r12), %xmm2 # get the appropriate shuffle mask
+ pshufb %xmm2, %xmm1 # right shift 16-%r13 butes
+ movdqa %xmm1, %xmm2
+ pxor %xmm1, %xmm0 # Ciphertext XOR E(K, Yn)
+ movdqu ALL_F-SHIFT_MASK(%r12), %xmm1
+ # get the appropriate mask to mask out top 16-%r13 bytes of %xmm0
+ pand %xmm1, %xmm0 # mask out top 16-%r13 bytes of %xmm0
+ pand %xmm1, %xmm2
+ pshufb SHUF_MASK(%rip),%xmm2
+ pxor %xmm2, %xmm8
+ GHASH_MUL %xmm8, %xmm13, %xmm9, %xmm10, %xmm11, %xmm5, %xmm6
+ # GHASH computation for the last <16 byte block
+ sub %r13, %r11
+ add $16, %r11
+
+ # output %r13 bytes
+ movq %xmm0, %rax
+ cmp $8, %r13
+ jle _less_than_8_bytes_left_decrypt
+ mov %rax, (%arg2 , %r11, 1)
+ add $8, %r11
+ psrldq $8, %xmm0
+ movq %xmm0, %rax
+ sub $8, %r13
+_less_than_8_bytes_left_decrypt:
+ mov %al, (%arg2, %r11, 1)
+ add $1, %r11
+ shr $8, %rax
+ sub $1, %r13
+ jne _less_than_8_bytes_left_decrypt
+_multiple_of_16_bytes_decrypt:
+ mov arg8, %r12 # %r13 = aadLen (number of bytes)
+ shl $3, %r12 # convert into number of bits
+ movd %r12d, %xmm15 # len(A) in %xmm15
+ shl $3, %arg4 # len(C) in bits (*128)
+ movq %arg4, %xmm1
+ pslldq $8, %xmm15 # %xmm15 = len(A)||0x0000000000000000
+ pxor %xmm1, %xmm15 # %xmm15 = len(A)||len(C)
+ pxor %xmm15, %xmm8
+ GHASH_MUL %xmm8, %xmm13, %xmm9, %xmm10, %xmm11, %xmm5, %xmm6
+ # final GHASH computation
+ pshufb SHUF_MASK(%rip), %xmm8
+ mov %arg5, %rax # %rax = *Y0
+ movdqu (%rax), %xmm0 # %xmm0 = Y0
+ ENCRYPT_SINGLE_BLOCK %xmm0, %xmm1 # E(K, Y0)
+ pxor %xmm8, %xmm0
+_return_T_decrypt:
+ mov arg9, %r10 # %r10 = authTag
+ mov arg10, %r11 # %r11 = auth_tag_len
+ cmp $16, %r11
+ je _T_16_decrypt
+ cmp $12, %r11
+ je _T_12_decrypt
+_T_8_decrypt:
+ movq %xmm0, %rax
+ mov %rax, (%r10)
+ jmp _return_T_done_decrypt
+_T_12_decrypt:
+ movq %xmm0, %rax
+ mov %rax, (%r10)
+ psrldq $8, %xmm0
+ movd %xmm0, %eax
+ mov %eax, 8(%r10)
+ jmp _return_T_done_decrypt
+_T_16_decrypt:
+ movdqu %xmm0, (%r10)
+_return_T_done_decrypt:
+ mov %r14, %rsp
+ pop %r14
+ pop %r13
+ pop %r12
+ ret
+
+
+/*****************************************************************************
+* void aesni_gcm_enc(void *aes_ctx, // AES Key schedule. Starts on a 16 byte boundary.
+* u8 *out, // Ciphertext output. Encrypt in-place is allowed.
+* const u8 *in, // Plaintext input
+* u64 plaintext_len, // Length of data in bytes for encryption.
+* u8 *iv, // Pre-counter block j0: 4 byte salt (from Security Association)
+* // concatenated with 8 byte Initialisation Vector (from IPSec ESP Payload)
+* // concatenated with 0x00000001. 16-byte aligned pointer.
+* u8 *hash_subkey, // H, the Hash sub key input. Data starts on a 16-byte boundary.
+* const u8 *aad, // Additional Authentication Data (AAD)
+* u64 aad_len, // Length of AAD in bytes. With RFC4106 this is going to be 8 or 12 bytes
+* u8 *auth_tag, // Authenticated Tag output.
+* u64 auth_tag_len); // Authenticated Tag Length in bytes. Valid values are 16 (most likely),
+* // 12 or 8.
+*
+* Assumptions:
+*
+* keys:
+* keys are pre-expanded and aligned to 16 bytes. we are using the
+* first set of 11 keys in the data structure void *aes_ctx
+*
+*
+* iv:
+* 0 1 2 3
+* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | Salt (From the SA) |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | Initialization Vector |
+* | (This is the sequence number from IPSec header) |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | 0x1 |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*
+*
+*
+* AAD:
+* AAD padded to 128 bits with 0
+* for example, assume AAD is a u32 vector
+*
+* if AAD is 8 bytes:
+* AAD[3] = {A0, A1};
+* padded AAD in xmm register = {A1 A0 0 0}
+*
+* 0 1 2 3
+* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | SPI (A1) |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | 32-bit Sequence Number (A0) |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | 0x0 |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*
+* AAD Format with 32-bit Sequence Number
+*
+* if AAD is 12 bytes:
+* AAD[3] = {A0, A1, A2};
+* padded AAD in xmm register = {A2 A1 A0 0}
+*
+* 0 1 2 3
+* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | SPI (A2) |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | 64-bit Extended Sequence Number {A1,A0} |
+* | |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | 0x0 |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*
+* AAD Format with 64-bit Extended Sequence Number
+*
+* aadLen:
+* from the definition of the spec, aadLen can only be 8 or 12 bytes.
+* The code supports 16 too but for other sizes, the code will fail.
+*
+* TLen:
+* from the definition of the spec, TLen can only be 8, 12 or 16 bytes.
+* For other sizes, the code will fail.
+*
+* poly = x^128 + x^127 + x^126 + x^121 + 1
+***************************************************************************/
+ENTRY(aesni_gcm_enc)
+ push %r12
+ push %r13
+ push %r14
+ mov %rsp, %r14
+#
+# states of %xmm registers %xmm6:%xmm15 not saved
+# all %xmm registers are clobbered
+#
+ sub $VARIABLE_OFFSET, %rsp
+ and $~63, %rsp
+ mov %arg6, %r12
+ movdqu (%r12), %xmm13
+ pshufb SHUF_MASK(%rip), %xmm13
+
+# precompute HashKey<<1 mod poly from the HashKey (required for GHASH)
+
+ movdqa %xmm13, %xmm2
+ psllq $1, %xmm13
+ psrlq $63, %xmm2
+ movdqa %xmm2, %xmm1
+ pslldq $8, %xmm2
+ psrldq $8, %xmm1
+ por %xmm2, %xmm13
+
+ # reduce HashKey<<1
+
+ pshufd $0x24, %xmm1, %xmm2
+ pcmpeqd TWOONE(%rip), %xmm2
+ pand POLY(%rip), %xmm2
+ pxor %xmm2, %xmm13
+ movdqa %xmm13, HashKey(%rsp)
+ mov %arg4, %r13 # %xmm13 holds HashKey<<1 (mod poly)
+ and $-16, %r13
+ mov %r13, %r12
+
+ # Encrypt first few blocks
+
+ and $(3<<4), %r12
+ jz _initial_num_blocks_is_0_encrypt
+ cmp $(2<<4), %r12
+ jb _initial_num_blocks_is_1_encrypt
+ je _initial_num_blocks_is_2_encrypt
+_initial_num_blocks_is_3_encrypt:
+ INITIAL_BLOCKS 3, %xmm9, %xmm10, %xmm13, %xmm11, %xmm12, %xmm0, \
+%xmm1, %xmm2, %xmm3, %xmm4, %xmm8, %xmm5, %xmm6, 5, 678, enc
+ sub $48, %r13
+ jmp _initial_blocks_encrypted
+_initial_num_blocks_is_2_encrypt:
+ INITIAL_BLOCKS 2, %xmm9, %xmm10, %xmm13, %xmm11, %xmm12, %xmm0, \
+%xmm1, %xmm2, %xmm3, %xmm4, %xmm8, %xmm5, %xmm6, 6, 78, enc
+ sub $32, %r13
+ jmp _initial_blocks_encrypted
+_initial_num_blocks_is_1_encrypt:
+ INITIAL_BLOCKS 1, %xmm9, %xmm10, %xmm13, %xmm11, %xmm12, %xmm0, \
+%xmm1, %xmm2, %xmm3, %xmm4, %xmm8, %xmm5, %xmm6, 7, 8, enc
+ sub $16, %r13
+ jmp _initial_blocks_encrypted
+_initial_num_blocks_is_0_encrypt:
+ INITIAL_BLOCKS 0, %xmm9, %xmm10, %xmm13, %xmm11, %xmm12, %xmm0, \
+%xmm1, %xmm2, %xmm3, %xmm4, %xmm8, %xmm5, %xmm6, 8, 0, enc
+_initial_blocks_encrypted:
+
+ # Main loop - Encrypt remaining blocks
+
+ cmp $0, %r13
+ je _zero_cipher_left_encrypt
+ sub $64, %r13
+ je _four_cipher_left_encrypt
+_encrypt_by_4_encrypt:
+ GHASH_4_ENCRYPT_4_PARALLEL %xmm9, %xmm10, %xmm11, %xmm12, %xmm13, \
+%xmm14, %xmm0, %xmm1, %xmm2, %xmm3, %xmm4, %xmm5, %xmm6, %xmm7, %xmm8, enc
+ add $64, %r11
+ sub $64, %r13
+ jne _encrypt_by_4_encrypt
+_four_cipher_left_encrypt:
+ GHASH_LAST_4 %xmm9, %xmm10, %xmm11, %xmm12, %xmm13, %xmm14, \
+%xmm15, %xmm1, %xmm2, %xmm3, %xmm4, %xmm8
+_zero_cipher_left_encrypt:
+ mov %arg4, %r13
+ and $15, %r13 # %r13 = arg4 (mod 16)
+ je _multiple_of_16_bytes_encrypt
+
+ # Handle the last <16 Byte block seperately
+ paddd ONE(%rip), %xmm0 # INCR CNT to get Yn
+ pshufb SHUF_MASK(%rip), %xmm0
+ ENCRYPT_SINGLE_BLOCK %xmm0, %xmm1 # Encrypt(K, Yn)
+ sub $16, %r11
+ add %r13, %r11
+ movdqu (%arg3,%r11,1), %xmm1 # receive the last <16 byte blocks
+ lea SHIFT_MASK+16(%rip), %r12
+ sub %r13, %r12
+ # adjust the shuffle mask pointer to be able to shift 16-r13 bytes
+ # (%r13 is the number of bytes in plaintext mod 16)
+ movdqu (%r12), %xmm2 # get the appropriate shuffle mask
+ pshufb %xmm2, %xmm1 # shift right 16-r13 byte
+ pxor %xmm1, %xmm0 # Plaintext XOR Encrypt(K, Yn)
+ movdqu ALL_F-SHIFT_MASK(%r12), %xmm1
+ # get the appropriate mask to mask out top 16-r13 bytes of xmm0
+ pand %xmm1, %xmm0 # mask out top 16-r13 bytes of xmm0
+
+ pshufb SHUF_MASK(%rip),%xmm0
+ pxor %xmm0, %xmm8
+ GHASH_MUL %xmm8, %xmm13, %xmm9, %xmm10, %xmm11, %xmm5, %xmm6
+ # GHASH computation for the last <16 byte block
+ sub %r13, %r11
+ add $16, %r11
+ pshufb SHUF_MASK(%rip), %xmm0
+ # shuffle xmm0 back to output as ciphertext
+
+ # Output %r13 bytes
+ movq %xmm0, %rax
+ cmp $8, %r13
+ jle _less_than_8_bytes_left_encrypt
+ mov %rax, (%arg2 , %r11, 1)
+ add $8, %r11
+ psrldq $8, %xmm0
+ movq %xmm0, %rax
+ sub $8, %r13
+_less_than_8_bytes_left_encrypt:
+ mov %al, (%arg2, %r11, 1)
+ add $1, %r11
+ shr $8, %rax
+ sub $1, %r13
+ jne _less_than_8_bytes_left_encrypt
+_multiple_of_16_bytes_encrypt:
+ mov arg8, %r12 # %r12 = addLen (number of bytes)
+ shl $3, %r12
+ movd %r12d, %xmm15 # len(A) in %xmm15
+ shl $3, %arg4 # len(C) in bits (*128)
+ movq %arg4, %xmm1
+ pslldq $8, %xmm15 # %xmm15 = len(A)||0x0000000000000000
+ pxor %xmm1, %xmm15 # %xmm15 = len(A)||len(C)
+ pxor %xmm15, %xmm8
+ GHASH_MUL %xmm8, %xmm13, %xmm9, %xmm10, %xmm11, %xmm5, %xmm6
+ # final GHASH computation
+
+ pshufb SHUF_MASK(%rip), %xmm8 # perform a 16 byte swap
+ mov %arg5, %rax # %rax = *Y0
+ movdqu (%rax), %xmm0 # %xmm0 = Y0
+ ENCRYPT_SINGLE_BLOCK %xmm0, %xmm15 # Encrypt(K, Y0)
+ pxor %xmm8, %xmm0
+_return_T_encrypt:
+ mov arg9, %r10 # %r10 = authTag
+ mov arg10, %r11 # %r11 = auth_tag_len
+ cmp $16, %r11
+ je _T_16_encrypt
+ cmp $12, %r11
+ je _T_12_encrypt
+_T_8_encrypt:
+ movq %xmm0, %rax
+ mov %rax, (%r10)
+ jmp _return_T_done_encrypt
+_T_12_encrypt:
+ movq %xmm0, %rax
+ mov %rax, (%r10)
+ psrldq $8, %xmm0
+ movd %xmm0, %eax
+ mov %eax, 8(%r10)
+ jmp _return_T_done_encrypt
+_T_16_encrypt:
+ movdqu %xmm0, (%r10)
+_return_T_done_encrypt:
+ mov %r14, %rsp
+ pop %r14
+ pop %r13
+ pop %r12
+ ret
+
+
+
_key_expansion_128:
_key_expansion_256a:
pshufd $0b11111111, %xmm1, %xmm1
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