1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
C x86_64/poly1305-internal.asm
ifelse(`
Copyright (C) 2013 Niels Möller
This file is part of GNU Nettle.
GNU Nettle is free software: you can redistribute it and/or
modify it under the terms of either:
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
or both in parallel, as here.
GNU Nettle is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see http://www.gnu.org/licenses/.
')
.file "poly1305-internal.asm"
C Registers mainly used by poly1305_block
define(`CTX', `%rdi') C First argument to all functions
define(`KEY', `%rsi')
define(`MASK',` %r8')
C _poly1305_set_key(struct poly1305_ctx *ctx, const uint8_t key[16])
.text
ALIGN(16)
PROLOGUE(_nettle_poly1305_set_key)
W64_ENTRY(2,0)
mov $0x0ffffffc0fffffff, MASK
mov (KEY), %rax
and MASK, %rax
and $-4, MASK
mov %rax, P1305_R0 (CTX)
imul $5, %rax
mov %rax, P1305_S0 (CTX) C 5*R0
mov 8(KEY), %rax
and MASK, %rax
mov %rax, P1305_R1 (CTX)
shr $2, %rax
imul $5, %rax
mov %rax, P1305_S1 (CTX) C 5*(R1>>2)
xor XREG(%rax), XREG(%rax)
mov %rax, P1305_H0 (CTX)
mov %rax, P1305_H1 (CTX)
mov %rax, P1305_H2 (CTX)
W64_EXIT(2,0)
ret
undefine(`KEY')
undefine(`MASK')
EPILOGUE(_nettle_poly1305_set_key)
define(`T0', `%rcx')
define(`T1', `%rsi') C Overlaps message input pointer.
define(`T2', `%r8')
define(`H0', `%r9')
define(`H1', `%r10')
define(`F0', `%r11')
define(`F1', `%r12')
C First accumulate the independent products
C
C {H1,H0} = R0 T0 + S1 T1 + S0 (T2 >> 2)
C {F1,F0} = R1 T0 + R0 T1 + S1 T2
C T = R0 * (T2 & 3)
C
C Then add together as
C
C +--+--+--+
C |T |H1|H0|
C +--+--+--+
C + |F1|F0|
C --+--+--+--+
C |H2|H1|H0|
C +--+--+--+
C _poly1305_block (struct poly1305_ctx *ctx, const uint8_t m[16], unsigned hi)
PROLOGUE(_nettle_poly1305_block)
W64_ENTRY(3, 0)
push %r12
mov (%rsi), T0
mov 8(%rsi), T1
mov XREG(%rdx), XREG(T2) C Also zero extends
add P1305_H0 (CTX), T0
adc P1305_H1 (CTX), T1
adc P1305_H2 (CTX), T2
mov P1305_R1 (CTX), %rax
mul T0 C R1 T0
mov %rax, F0
mov %rdx, F1
mov T0, %rax C Last use of T0 input
mov P1305_R0 (CTX), T0
mul T0 C R0*T0
mov %rax, H0
mov %rdx, H1
mov T1, %rax
mul T0 C R0*T1
add %rax, F0
adc %rdx, F1
mov P1305_S1 (CTX), T0
mov T1, %rax C Last use of T1 input
mul T0 C S1*T1
add %rax, H0
adc %rdx, H1
mov T2, %rax
mul T0 C S1*T2
add %rax, F0
adc %rdx, F1
mov $3, XREG(T1)
and T2, T1
shr $2, T2
mov P1305_S0 (CTX), %rax
mul T2 C S0*(T2 >> 2)
add %rax, H0
adc %rdx, H1
imul P1305_R0 (CTX), T1 C R0*(T2 & 3)
add F0, H1
adc T1, F1
mov H0, P1305_H0 (CTX)
mov H1, P1305_H1 (CTX)
mov F1, P1305_H2 (CTX)
pop %r12
W64_EXIT(3, 0)
ret
EPILOGUE(_nettle_poly1305_block)
undefine(`T0')
undefine(`T1')
undefine(`T2')
undefine(`H0')
undefine(`H1')
undefine(`F0')
undefine(`F1')
C _poly1305_digest (struct poly1305_ctx *ctx, uint8_t *s)
define(`S', `%rsi')
define(`T0', `%rcx')
define(`T1', `%r8')
define(`H0', `%r9')
define(`H1', `%r10')
define(`F0', `%r11')
define(`F1', `%rrd') C Overlaps CTX
PROLOGUE(_nettle_poly1305_digest)
W64_ENTRY(2, 0)
mov P1305_H0 (CTX), H0
mov P1305_H1 (CTX), H1
mov P1305_H2 (CTX), F0
xor XREG(%rax), XREG(%rax)
mov %rax, P1305_H0 (CTX)
mov %rax, P1305_H1 (CTX)
mov %rax, P1305_H2 (CTX)
mov $3, XREG(%rax)
and XREG(F0), XREG(%rax)
shr $2, F0
imul $5, F0
add F0, H0
adc $0, H1
adc $0, XREG(%rax)
C Add 5, use result if >= 2^130
mov $5, T0
xor T1, T1
add H0, T0
adc H1, T1
adc $-4, XREG(%rax) C Carry if %rax + c >= 4
cmovc T0, H0
cmovc T1, H1
add H0, (S)
adc H1, 8(S)
W64_EXIT(2, 0)
ret
EPILOGUE(_nettle_poly1305_digest)
|
