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
|
// Implementation of multiplication of an fe25519 bit value with the curve constant 121666.
//
// B. Haase, Endress + Hauser Conducta GmbH & Ko. KG
// public domain.
//
// gnu assembler format.
//
// Generated and tested with C++ functions in the test subdirectory.
//
// ATTENTION:
// Not yet tested on target hardware.
.code 16
.text
.align 2
.global fe25519_mpyWith121666_asm
.code 16
.thumb_func
.type fe25519_mpyWith121666_asm, %function
fe25519_mpyWith121666_asm:
push {r4,r5,r6,r7,r14}
ldr r7,=56130
ldr r2,[r1,#28]
lsl r5,r2,#16
lsr r6,r2,#16
lsr r3,r2,#16
uxth r2,r2
mul r2,r7
mul r3,r7
add r5,r2
mov r2,#0
adc r6,r2
lsl r2,r3,#16
lsr r3,r3,#16
add r5,r2
adc r6,r3
lsl r2,r5,#1
lsr r2,r2,#1
str r2,[r0,#28]
lsr r5,r5,#31
lsl r6,r6,#1
orr r5,r6
mov r6,#19
mul r5,r6
mov r6,#0
ldr r2,[r1,#0]
lsl r3,r2,#16
lsr r4,r2,#16
add r5,r3
adc r6,r4
lsr r3,r2,#16
uxth r2,r2
mul r2,r7
mul r3,r7
add r5,r2
mov r2,#0
adc r6,r2
lsl r2,r3,#16
lsr r3,r3,#16
add r5,r2
adc r6,r3
str r5,[r0,#0]
mov r5,#0
ldr r2,[r1,#4]
lsl r3,r2,#16
lsr r4,r2,#16
add r6,r3
adc r5,r4
lsr r3,r2,#16
uxth r2,r2
mul r2,r7
mul r3,r7
add r6,r2
mov r2,#0
adc r5,r2
lsl r2,r3,#16
lsr r3,r3,#16
add r6,r2
adc r5,r3
str r6,[r0,#4]
mov r6,#0
ldr r2,[r1,#8]
lsl r3,r2,#16
lsr r4,r2,#16
add r5,r3
adc r6,r4
lsr r3,r2,#16
uxth r2,r2
mul r2,r7
mul r3,r7
add r5,r2
mov r2,#0
adc r6,r2
lsl r2,r3,#16
lsr r3,r3,#16
add r5,r2
adc r6,r3
str r5,[r0,#8]
mov r5,#0
ldr r2,[r1,#12]
lsl r3,r2,#16
lsr r4,r2,#16
add r6,r3
adc r5,r4
lsr r3,r2,#16
uxth r2,r2
mul r2,r7
mul r3,r7
add r6,r2
mov r2,#0
adc r5,r2
lsl r2,r3,#16
lsr r3,r3,#16
add r6,r2
adc r5,r3
str r6,[r0,#12]
mov r6,#0
ldr r2,[r1,#16]
lsl r3,r2,#16
lsr r4,r2,#16
add r5,r3
adc r6,r4
lsr r3,r2,#16
uxth r2,r2
mul r2,r7
mul r3,r7
add r5,r2
mov r2,#0
adc r6,r2
lsl r2,r3,#16
lsr r3,r3,#16
add r5,r2
adc r6,r3
str r5,[r0,#16]
mov r5,#0
ldr r2,[r1,#20]
lsl r3,r2,#16
lsr r4,r2,#16
add r6,r3
adc r5,r4
lsr r3,r2,#16
uxth r2,r2
mul r2,r7
mul r3,r7
add r6,r2
mov r2,#0
adc r5,r2
lsl r2,r3,#16
lsr r3,r3,#16
add r6,r2
adc r5,r3
str r6,[r0,#20]
mov r6,#0
ldr r2,[r1,#24]
lsl r3,r2,#16
lsr r4,r2,#16
add r5,r3
adc r6,r4
lsr r3,r2,#16
uxth r2,r2
mul r2,r7
mul r3,r7
add r5,r2
mov r2,#0
adc r6,r2
lsl r2,r3,#16
lsr r3,r3,#16
add r5,r2
adc r6,r3
str r5,[r0,#24]
mov r5,#0
ldr r2,[r0,#28]
add r6,r2
str r6,[r0,#28]
pop {r4,r5,r6,r7,r15}
.size fe25519_mpyWith121666_asm, .-fe25519_mpyWith121666_asm
|
