1// Copyright 2013 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// DO NOT EDIT.
6// Generate with: go run gen.go -full -output md5block.go
7
8package md5
9
10import (
11	"runtime"
12	"unsafe"
13)
14
15const x86 = runtime.GOARCH == "amd64" || runtime.GOARCH == "386"
16
17var littleEndian bool
18
19func init() {
20	x := uint32(0x04030201)
21	y := [4]byte{0x1, 0x2, 0x3, 0x4}
22	littleEndian = *(*[4]byte)(unsafe.Pointer(&x)) == y
23}
24
25func blockGeneric(dig *digest, p []byte) {
26	a := dig.s[0]
27	b := dig.s[1]
28	c := dig.s[2]
29	d := dig.s[3]
30	var X *[16]uint32
31	var xbuf [16]uint32
32	for len(p) >= chunk {
33		aa, bb, cc, dd := a, b, c, d
34
35		// This is a constant condition - it is not evaluated on each iteration.
36		if x86 {
37			// MD5 was designed so that x86 processors can just iterate
38			// over the block data directly as uint32s, and we generate
39			// less code and run 1.3x faster if we take advantage of that.
40			// My apologies.
41			X = (*[16]uint32)(unsafe.Pointer(&p[0]))
42		} else if littleEndian && uintptr(unsafe.Pointer(&p[0]))&(unsafe.Alignof(uint32(0))-1) == 0 {
43			X = (*[16]uint32)(unsafe.Pointer(&p[0]))
44		} else {
45			X = &xbuf
46			j := 0
47			for i := 0; i < 16; i++ {
48				X[i&15] = uint32(p[j]) | uint32(p[j+1])<<8 | uint32(p[j+2])<<16 | uint32(p[j+3])<<24
49				j += 4
50			}
51		}
52
53		// Round 1.
54
55		a += (((c ^ d) & b) ^ d) + X[0] + 3614090360
56		a = a<<7 | a>>(32-7) + b
57
58		d += (((b ^ c) & a) ^ c) + X[1] + 3905402710
59		d = d<<12 | d>>(32-12) + a
60
61		c += (((a ^ b) & d) ^ b) + X[2] + 606105819
62		c = c<<17 | c>>(32-17) + d
63
64		b += (((d ^ a) & c) ^ a) + X[3] + 3250441966
65		b = b<<22 | b>>(32-22) + c
66
67		a += (((c ^ d) & b) ^ d) + X[4] + 4118548399
68		a = a<<7 | a>>(32-7) + b
69
70		d += (((b ^ c) & a) ^ c) + X[5] + 1200080426
71		d = d<<12 | d>>(32-12) + a
72
73		c += (((a ^ b) & d) ^ b) + X[6] + 2821735955
74		c = c<<17 | c>>(32-17) + d
75
76		b += (((d ^ a) & c) ^ a) + X[7] + 4249261313
77		b = b<<22 | b>>(32-22) + c
78
79		a += (((c ^ d) & b) ^ d) + X[8] + 1770035416
80		a = a<<7 | a>>(32-7) + b
81
82		d += (((b ^ c) & a) ^ c) + X[9] + 2336552879
83		d = d<<12 | d>>(32-12) + a
84
85		c += (((a ^ b) & d) ^ b) + X[10] + 4294925233
86		c = c<<17 | c>>(32-17) + d
87
88		b += (((d ^ a) & c) ^ a) + X[11] + 2304563134
89		b = b<<22 | b>>(32-22) + c
90
91		a += (((c ^ d) & b) ^ d) + X[12] + 1804603682
92		a = a<<7 | a>>(32-7) + b
93
94		d += (((b ^ c) & a) ^ c) + X[13] + 4254626195
95		d = d<<12 | d>>(32-12) + a
96
97		c += (((a ^ b) & d) ^ b) + X[14] + 2792965006
98		c = c<<17 | c>>(32-17) + d
99
100		b += (((d ^ a) & c) ^ a) + X[15] + 1236535329
101		b = b<<22 | b>>(32-22) + c
102
103		// Round 2.
104
105		a += (((b ^ c) & d) ^ c) + X[(1+5*0)&15] + 4129170786
106		a = a<<5 | a>>(32-5) + b
107
108		d += (((a ^ b) & c) ^ b) + X[(1+5*1)&15] + 3225465664
109		d = d<<9 | d>>(32-9) + a
110
111		c += (((d ^ a) & b) ^ a) + X[(1+5*2)&15] + 643717713
112		c = c<<14 | c>>(32-14) + d
113
114		b += (((c ^ d) & a) ^ d) + X[(1+5*3)&15] + 3921069994
115		b = b<<20 | b>>(32-20) + c
116
117		a += (((b ^ c) & d) ^ c) + X[(1+5*4)&15] + 3593408605
118		a = a<<5 | a>>(32-5) + b
119
120		d += (((a ^ b) & c) ^ b) + X[(1+5*5)&15] + 38016083
121		d = d<<9 | d>>(32-9) + a
122
123		c += (((d ^ a) & b) ^ a) + X[(1+5*6)&15] + 3634488961
124		c = c<<14 | c>>(32-14) + d
125
126		b += (((c ^ d) & a) ^ d) + X[(1+5*7)&15] + 3889429448
127		b = b<<20 | b>>(32-20) + c
128
129		a += (((b ^ c) & d) ^ c) + X[(1+5*8)&15] + 568446438
130		a = a<<5 | a>>(32-5) + b
131
132		d += (((a ^ b) & c) ^ b) + X[(1+5*9)&15] + 3275163606
133		d = d<<9 | d>>(32-9) + a
134
135		c += (((d ^ a) & b) ^ a) + X[(1+5*10)&15] + 4107603335
136		c = c<<14 | c>>(32-14) + d
137
138		b += (((c ^ d) & a) ^ d) + X[(1+5*11)&15] + 1163531501
139		b = b<<20 | b>>(32-20) + c
140
141		a += (((b ^ c) & d) ^ c) + X[(1+5*12)&15] + 2850285829
142		a = a<<5 | a>>(32-5) + b
143
144		d += (((a ^ b) & c) ^ b) + X[(1+5*13)&15] + 4243563512
145		d = d<<9 | d>>(32-9) + a
146
147		c += (((d ^ a) & b) ^ a) + X[(1+5*14)&15] + 1735328473
148		c = c<<14 | c>>(32-14) + d
149
150		b += (((c ^ d) & a) ^ d) + X[(1+5*15)&15] + 2368359562
151		b = b<<20 | b>>(32-20) + c
152
153		// Round 3.
154
155		a += (b ^ c ^ d) + X[(5+3*0)&15] + 4294588738
156		a = a<<4 | a>>(32-4) + b
157
158		d += (a ^ b ^ c) + X[(5+3*1)&15] + 2272392833
159		d = d<<11 | d>>(32-11) + a
160
161		c += (d ^ a ^ b) + X[(5+3*2)&15] + 1839030562
162		c = c<<16 | c>>(32-16) + d
163
164		b += (c ^ d ^ a) + X[(5+3*3)&15] + 4259657740
165		b = b<<23 | b>>(32-23) + c
166
167		a += (b ^ c ^ d) + X[(5+3*4)&15] + 2763975236
168		a = a<<4 | a>>(32-4) + b
169
170		d += (a ^ b ^ c) + X[(5+3*5)&15] + 1272893353
171		d = d<<11 | d>>(32-11) + a
172
173		c += (d ^ a ^ b) + X[(5+3*6)&15] + 4139469664
174		c = c<<16 | c>>(32-16) + d
175
176		b += (c ^ d ^ a) + X[(5+3*7)&15] + 3200236656
177		b = b<<23 | b>>(32-23) + c
178
179		a += (b ^ c ^ d) + X[(5+3*8)&15] + 681279174
180		a = a<<4 | a>>(32-4) + b
181
182		d += (a ^ b ^ c) + X[(5+3*9)&15] + 3936430074
183		d = d<<11 | d>>(32-11) + a
184
185		c += (d ^ a ^ b) + X[(5+3*10)&15] + 3572445317
186		c = c<<16 | c>>(32-16) + d
187
188		b += (c ^ d ^ a) + X[(5+3*11)&15] + 76029189
189		b = b<<23 | b>>(32-23) + c
190
191		a += (b ^ c ^ d) + X[(5+3*12)&15] + 3654602809
192		a = a<<4 | a>>(32-4) + b
193
194		d += (a ^ b ^ c) + X[(5+3*13)&15] + 3873151461
195		d = d<<11 | d>>(32-11) + a
196
197		c += (d ^ a ^ b) + X[(5+3*14)&15] + 530742520
198		c = c<<16 | c>>(32-16) + d
199
200		b += (c ^ d ^ a) + X[(5+3*15)&15] + 3299628645
201		b = b<<23 | b>>(32-23) + c
202
203		// Round 4.
204
205		a += (c ^ (b | ^d)) + X[(7*0)&15] + 4096336452
206		a = a<<6 | a>>(32-6) + b
207
208		d += (b ^ (a | ^c)) + X[(7*1)&15] + 1126891415
209		d = d<<10 | d>>(32-10) + a
210
211		c += (a ^ (d | ^b)) + X[(7*2)&15] + 2878612391
212		c = c<<15 | c>>(32-15) + d
213
214		b += (d ^ (c | ^a)) + X[(7*3)&15] + 4237533241
215		b = b<<21 | b>>(32-21) + c
216
217		a += (c ^ (b | ^d)) + X[(7*4)&15] + 1700485571
218		a = a<<6 | a>>(32-6) + b
219
220		d += (b ^ (a | ^c)) + X[(7*5)&15] + 2399980690
221		d = d<<10 | d>>(32-10) + a
222
223		c += (a ^ (d | ^b)) + X[(7*6)&15] + 4293915773
224		c = c<<15 | c>>(32-15) + d
225
226		b += (d ^ (c | ^a)) + X[(7*7)&15] + 2240044497
227		b = b<<21 | b>>(32-21) + c
228
229		a += (c ^ (b | ^d)) + X[(7*8)&15] + 1873313359
230		a = a<<6 | a>>(32-6) + b
231
232		d += (b ^ (a | ^c)) + X[(7*9)&15] + 4264355552
233		d = d<<10 | d>>(32-10) + a
234
235		c += (a ^ (d | ^b)) + X[(7*10)&15] + 2734768916
236		c = c<<15 | c>>(32-15) + d
237
238		b += (d ^ (c | ^a)) + X[(7*11)&15] + 1309151649
239		b = b<<21 | b>>(32-21) + c
240
241		a += (c ^ (b | ^d)) + X[(7*12)&15] + 4149444226
242		a = a<<6 | a>>(32-6) + b
243
244		d += (b ^ (a | ^c)) + X[(7*13)&15] + 3174756917
245		d = d<<10 | d>>(32-10) + a
246
247		c += (a ^ (d | ^b)) + X[(7*14)&15] + 718787259
248		c = c<<15 | c>>(32-15) + d
249
250		b += (d ^ (c | ^a)) + X[(7*15)&15] + 3951481745
251		b = b<<21 | b>>(32-21) + c
252
253		a += aa
254		b += bb
255		c += cc
256		d += dd
257
258		p = p[chunk:]
259	}
260
261	dig.s[0] = a
262	dig.s[1] = b
263	dig.s[2] = c
264	dig.s[3] = d
265}
266