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chacha_private.h

Absolute File Name:/home/opencoverage/opencoverage/guest-scripts/openssh/src/openbsd-compat/chacha_private.h
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1/*-
2chacha-merged.c version 20080118-
3D. J. Bernstein-
4Public domain.-
5*/-
6-
7/* $OpenBSD: chacha_private.h,v 1.2 2013/10/04 07:02:27 djm Exp $ */-
8-
9typedef unsigned char u8;-
10typedef unsigned int u32;-
11-
12typedef struct-
13{-
14 u32 input[16]; /* could be compressed */-
15} chacha_ctx;-
16-
17#define U8C(v) (v##U)-
18#define U32C(v) (v##U)-
19-
20#define U8V(v) ((u8)(v) & U8C(0xFF))-
21#define U32V(v) ((u32)(v) & U32C(0xFFFFFFFF))-
22-
23#define ROTL32(v, n) \-
24 (U32V((v) << (n)) | ((v) >> (32 - (n))))-
25-
26#define U8TO32_LITTLE(p) \-
27 (((u32)((p)[0]) ) | \-
28 ((u32)((p)[1]) << 8) | \-
29 ((u32)((p)[2]) << 16) | \-
30 ((u32)((p)[3]) << 24))-
31-
32#define U32TO8_LITTLE(p, v) \-
33 do { \-
34 (p)[0] = U8V((v) ); \-
35 (p)[1] = U8V((v) >> 8); \-
36 (p)[2] = U8V((v) >> 16); \-
37 (p)[3] = U8V((v) >> 24); \-
38 } while (0)-
39-
40#define ROTATE(v,c) (ROTL32(v,c))-
41#define XOR(v,w) ((v) ^ (w))-
42#define PLUS(v,w) (U32V((v) + (w)))-
43#define PLUSONE(v) (PLUS((v),1))-
44-
45#define QUARTERROUND(a,b,c,d) \-
46 a = PLUS(a,b); d = ROTATE(XOR(d,a),16); \-
47 c = PLUS(c,d); b = ROTATE(XOR(b,c),12); \-
48 a = PLUS(a,b); d = ROTATE(XOR(d,a), 8); \-
49 c = PLUS(c,d); b = ROTATE(XOR(b,c), 7);-
50-
51static const char sigma[16] = "expand 32-byte k";-
52static const char tau[16] = "expand 16-byte k";-
53-
54static void-
55chacha_keysetup(chacha_ctx *x,const u8 *k,u32 kbits,u32 ivbits)-
56{-
57 const char *constants;-
58-
59 x->input[4] = U8TO32_LITTLE(k + 0);-
60 x->input[5] = U8TO32_LITTLE(k + 4);-
61 x->input[6] = U8TO32_LITTLE(k + 8);-
62 x->input[7] = U8TO32_LITTLE(k + 12);-
63 if (kbits == 256) { /* recommended */
kbits == 256Description
TRUEevaluated 3033 times by 4 tests
Evaluated by:
  • ssh-keygen
  • test_kex
  • test_sshbuf
  • test_sshkey
FALSEnever evaluated
0-3033
64 k += 16;-
65 constants = sigma;-
66 } else { /* kbits == 128 */
executed 3033 times by 4 tests: end of block
Executed by:
  • ssh-keygen
  • test_kex
  • test_sshbuf
  • test_sshkey
3033
67 constants = tau;-
68 }
never executed: end of block
0
69 x->input[8] = U8TO32_LITTLE(k + 0);-
70 x->input[9] = U8TO32_LITTLE(k + 4);-
71 x->input[10] = U8TO32_LITTLE(k + 8);-
72 x->input[11] = U8TO32_LITTLE(k + 12);-
73 x->input[0] = U8TO32_LITTLE(constants + 0);-
74 x->input[1] = U8TO32_LITTLE(constants + 4);-
75 x->input[2] = U8TO32_LITTLE(constants + 8);-
76 x->input[3] = U8TO32_LITTLE(constants + 12);-
77}
executed 3033 times by 4 tests: end of block
Executed by:
  • ssh-keygen
  • test_kex
  • test_sshbuf
  • test_sshkey
3033
78-
79static void-
80chacha_ivsetup(chacha_ctx *x,const u8 *iv)-
81{-
82 x->input[12] = 0;-
83 x->input[13] = 0;-
84 x->input[14] = U8TO32_LITTLE(iv + 0);-
85 x->input[15] = U8TO32_LITTLE(iv + 4);-
86}
executed 3033 times by 4 tests: end of block
Executed by:
  • ssh-keygen
  • test_kex
  • test_sshbuf
  • test_sshkey
3033
87-
88static void-
89chacha_encrypt_bytes(chacha_ctx *x,const u8 *m,u8 *c,u32 bytes)-
90{-
91 u32 x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;-
92 u32 j0, j1, j2, j3, j4, j5, j6, j7, j8, j9, j10, j11, j12, j13, j14, j15;-
93 u8 *ctarget = NULL;-
94 u8 tmp[64];-
95 u_int i;-
96-
97 if (!bytes) return;
never executed: return;
!bytesDescription
TRUEnever evaluated
FALSEevaluated 3023 times by 4 tests
Evaluated by:
  • ssh-keygen
  • test_kex
  • test_sshbuf
  • test_sshkey
0-3023
98-
99 j0 = x->input[0];-
100 j1 = x->input[1];-
101 j2 = x->input[2];-
102 j3 = x->input[3];-
103 j4 = x->input[4];-
104 j5 = x->input[5];-
105 j6 = x->input[6];-
106 j7 = x->input[7];-
107 j8 = x->input[8];-
108 j9 = x->input[9];-
109 j10 = x->input[10];-
110 j11 = x->input[11];-
111 j12 = x->input[12];-
112 j13 = x->input[13];-
113 j14 = x->input[14];-
114 j15 = x->input[15];-
115-
116 for (;;) {-
117 if (bytes < 64) {
bytes < 64Description
TRUEnever evaluated
FALSEevaluated 48368 times by 4 tests
Evaluated by:
  • ssh-keygen
  • test_kex
  • test_sshbuf
  • test_sshkey
0-48368
118 for (i = 0;i < bytes;++i) tmp[i] = m[i];
never executed: tmp[i] = m[i];
i < bytesDescription
TRUEnever evaluated
FALSEnever evaluated
0
119 m = tmp;-
120 ctarget = c;-
121 c = tmp;-
122 }
never executed: end of block
0
123 x0 = j0;-
124 x1 = j1;-
125 x2 = j2;-
126 x3 = j3;-
127 x4 = j4;-
128 x5 = j5;-
129 x6 = j6;-
130 x7 = j7;-
131 x8 = j8;-
132 x9 = j9;-
133 x10 = j10;-
134 x11 = j11;-
135 x12 = j12;-
136 x13 = j13;-
137 x14 = j14;-
138 x15 = j15;-
139 for (i = 20;i > 0;i -= 2) {
i > 0Description
TRUEevaluated 483680 times by 4 tests
Evaluated by:
  • ssh-keygen
  • test_kex
  • test_sshbuf
  • test_sshkey
FALSEevaluated 48368 times by 4 tests
Evaluated by:
  • ssh-keygen
  • test_kex
  • test_sshbuf
  • test_sshkey
48368-483680
140 QUARTERROUND( x0, x4, x8,x12)-
141 QUARTERROUND( x1, x5, x9,x13)-
142 QUARTERROUND( x2, x6,x10,x14)-
143 QUARTERROUND( x3, x7,x11,x15)-
144 QUARTERROUND( x0, x5,x10,x15)-
145 QUARTERROUND( x1, x6,x11,x12)-
146 QUARTERROUND( x2, x7, x8,x13)-
147 QUARTERROUND( x3, x4, x9,x14)-
148 }
executed 483680 times by 4 tests: end of block
Executed by:
  • ssh-keygen
  • test_kex
  • test_sshbuf
  • test_sshkey
483680
149 x0 = PLUS(x0,j0);-
150 x1 = PLUS(x1,j1);-
151 x2 = PLUS(x2,j2);-
152 x3 = PLUS(x3,j3);-
153 x4 = PLUS(x4,j4);-
154 x5 = PLUS(x5,j5);-
155 x6 = PLUS(x6,j6);-
156 x7 = PLUS(x7,j7);-
157 x8 = PLUS(x8,j8);-
158 x9 = PLUS(x9,j9);-
159 x10 = PLUS(x10,j10);-
160 x11 = PLUS(x11,j11);-
161 x12 = PLUS(x12,j12);-
162 x13 = PLUS(x13,j13);-
163 x14 = PLUS(x14,j14);-
164 x15 = PLUS(x15,j15);-
165-
166#ifndef KEYSTREAM_ONLY-
167 x0 = XOR(x0,U8TO32_LITTLE(m + 0));-
168 x1 = XOR(x1,U8TO32_LITTLE(m + 4));-
169 x2 = XOR(x2,U8TO32_LITTLE(m + 8));-
170 x3 = XOR(x3,U8TO32_LITTLE(m + 12));-
171 x4 = XOR(x4,U8TO32_LITTLE(m + 16));-
172 x5 = XOR(x5,U8TO32_LITTLE(m + 20));-
173 x6 = XOR(x6,U8TO32_LITTLE(m + 24));-
174 x7 = XOR(x7,U8TO32_LITTLE(m + 28));-
175 x8 = XOR(x8,U8TO32_LITTLE(m + 32));-
176 x9 = XOR(x9,U8TO32_LITTLE(m + 36));-
177 x10 = XOR(x10,U8TO32_LITTLE(m + 40));-
178 x11 = XOR(x11,U8TO32_LITTLE(m + 44));-
179 x12 = XOR(x12,U8TO32_LITTLE(m + 48));-
180 x13 = XOR(x13,U8TO32_LITTLE(m + 52));-
181 x14 = XOR(x14,U8TO32_LITTLE(m + 56));-
182 x15 = XOR(x15,U8TO32_LITTLE(m + 60));-
183#endif-
184-
185 j12 = PLUSONE(j12);-
186 if (!j12) {
!j12Description
TRUEnever evaluated
FALSEevaluated 48368 times by 4 tests
Evaluated by:
  • ssh-keygen
  • test_kex
  • test_sshbuf
  • test_sshkey
0-48368
187 j13 = PLUSONE(j13);-
188 /* stopping at 2^70 bytes per nonce is user's responsibility */-
189 }
never executed: end of block
0
190-
191 U32TO8_LITTLE(c + 0,x0);-
192 U32TO8_LITTLE(c + 4,x1);-
193 U32TO8_LITTLE(c + 8,x2);-
194 U32TO8_LITTLE(c + 12,x3);-
195 U32TO8_LITTLE(c + 16,x4);-
196 U32TO8_LITTLE(c + 20,x5);-
197 U32TO8_LITTLE(c + 24,x6);-
198 U32TO8_LITTLE(c + 28,x7);-
199 U32TO8_LITTLE(c + 32,x8);-
200 U32TO8_LITTLE(c + 36,x9);-
201 U32TO8_LITTLE(c + 40,x10);-
202 U32TO8_LITTLE(c + 44,x11);-
203 U32TO8_LITTLE(c + 48,x12);-
204 U32TO8_LITTLE(c + 52,x13);-
205 U32TO8_LITTLE(c + 56,x14);-
206 U32TO8_LITTLE(c + 60,x15);-
207-
208 if (bytes <= 64) {
bytes <= 64Description
TRUEevaluated 3023 times by 4 tests
Evaluated by:
  • ssh-keygen
  • test_kex
  • test_sshbuf
  • test_sshkey
FALSEevaluated 45345 times by 4 tests
Evaluated by:
  • ssh-keygen
  • test_kex
  • test_sshbuf
  • test_sshkey
3023-45345
209 if (bytes < 64) {
bytes < 64Description
TRUEnever evaluated
FALSEevaluated 3023 times by 4 tests
Evaluated by:
  • ssh-keygen
  • test_kex
  • test_sshbuf
  • test_sshkey
0-3023
210 for (i = 0;i < bytes;++i) ctarget[i] = c[i];
never executed: ctarget[i] = c[i];
i < bytesDescription
TRUEnever evaluated
FALSEnever evaluated
0
211 }
never executed: end of block
0
212 x->input[12] = j12;-
213 x->input[13] = j13;-
214 return;
executed 3023 times by 4 tests: return;
Executed by:
  • ssh-keygen
  • test_kex
  • test_sshbuf
  • test_sshkey
3023
215 }-
216 bytes -= 64;-
217 c += 64;-
218#ifndef KEYSTREAM_ONLY-
219 m += 64;-
220#endif-
221 }
executed 45345 times by 4 tests: end of block
Executed by:
  • ssh-keygen
  • test_kex
  • test_sshbuf
  • test_sshkey
45345
222}
never executed: end of block
0
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