Signed-off-by: Supraja Meedinti <supraja0493@gmail.com>
Reviewed-by: Giorgio Vazzana <mywing81@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
... | ... |
@@ -60,6 +60,7 @@ HEADERS = adler32.h \ |
60 | 60 |
time.h \ |
61 | 61 |
timecode.h \ |
62 | 62 |
timestamp.h \ |
63 |
+ twofish.h \ |
|
63 | 64 |
version.h \ |
64 | 65 |
xtea.h \ |
65 | 66 |
|
... | ... |
@@ -129,6 +130,7 @@ OBJS = adler32.o \ |
129 | 129 |
time.o \ |
130 | 130 |
timecode.o \ |
131 | 131 |
tree.o \ |
132 |
+ twofish.o \ |
|
132 | 133 |
utils.o \ |
133 | 134 |
xga_font_data.o \ |
134 | 135 |
xtea.o \ |
... | ... |
@@ -184,6 +186,7 @@ TESTPROGS = adler32 \ |
184 | 184 |
sha512 \ |
185 | 185 |
softfloat \ |
186 | 186 |
tree \ |
187 |
+ twofish \ |
|
187 | 188 |
utf8 \ |
188 | 189 |
xtea \ |
189 | 190 |
|
190 | 191 |
new file mode 100644 |
... | ... |
@@ -0,0 +1,375 @@ |
0 |
+/* |
|
1 |
+ * An implementation of the TwoFish algorithm |
|
2 |
+ * Copyright (c) 2015 Supraja Meedinti |
|
3 |
+ * |
|
4 |
+ * This file is part of FFmpeg. |
|
5 |
+ * |
|
6 |
+ * FFmpeg is free software; you can redistribute it and/or |
|
7 |
+ * modify it under the terms of the GNU Lesser General Public |
|
8 |
+ * License as published by the Free Software Foundation; either |
|
9 |
+ * version 2.1 of the License, or (at your option) any later version. |
|
10 |
+ * |
|
11 |
+ * FFmpeg is distributed in the hope that it will be useful, |
|
12 |
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
13 |
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
14 |
+ * Lesser General Public License for more details. |
|
15 |
+ * |
|
16 |
+ * You should have received a copy of the GNU Lesser General Public |
|
17 |
+ * License along with FFmpeg; if not, write to the Free Software |
|
18 |
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
19 |
+ */ |
|
20 |
+#include "twofish.h" |
|
21 |
+#include "common.h" |
|
22 |
+#include "intreadwrite.h" |
|
23 |
+#include "attributes.h" |
|
24 |
+ |
|
25 |
+#define LR(x, n) ((x) << (n) | (x) >> (32 - (n))) |
|
26 |
+#define RR(x, n) ((x) >> (n) | (x) << (32 - (n))) |
|
27 |
+ |
|
28 |
+typedef struct AVTWOFISH { |
|
29 |
+ uint32_t K[40]; |
|
30 |
+ uint32_t S[4]; |
|
31 |
+ int ksize; |
|
32 |
+} AVTWOFISH; |
|
33 |
+ |
|
34 |
+static const uint8_t MD1[256] = { |
|
35 |
+ 0x00, 0x5b, 0xb6, 0xed, 0x05, 0x5e, 0xb3, 0xe8, 0x0a, 0x51, 0xbc, 0xe7, 0x0f, 0x54, 0xb9, 0xe2, |
|
36 |
+ 0x14, 0x4f, 0xa2, 0xf9, 0x11, 0x4a, 0xa7, 0xfc, 0x1e, 0x45, 0xa8, 0xf3, 0x1b, 0x40, 0xad, 0xf6, |
|
37 |
+ 0x28, 0x73, 0x9e, 0xc5, 0x2d, 0x76, 0x9b, 0xc0, 0x22, 0x79, 0x94, 0xcf, 0x27, 0x7c, 0x91, 0xca, |
|
38 |
+ 0x3c, 0x67, 0x8a, 0xd1, 0x39, 0x62, 0x8f, 0xd4, 0x36, 0x6d, 0x80, 0xdb, 0x33, 0x68, 0x85, 0xde, |
|
39 |
+ 0x50, 0x0b, 0xe6, 0xbd, 0x55, 0x0e, 0xe3, 0xb8, 0x5a, 0x01, 0xec, 0xb7, 0x5f, 0x04, 0xe9, 0xb2, |
|
40 |
+ 0x44, 0x1f, 0xf2, 0xa9, 0x41, 0x1a, 0xf7, 0xac, 0x4e, 0x15, 0xf8, 0xa3, 0x4b, 0x10, 0xfd, 0xa6, |
|
41 |
+ 0x78, 0x23, 0xce, 0x95, 0x7d, 0x26, 0xcb, 0x90, 0x72, 0x29, 0xc4, 0x9f, 0x77, 0x2c, 0xc1, 0x9a, |
|
42 |
+ 0x6c, 0x37, 0xda, 0x81, 0x69, 0x32, 0xdf, 0x84, 0x66, 0x3d, 0xd0, 0x8b, 0x63, 0x38, 0xd5, 0x8e, |
|
43 |
+ 0xa0, 0xfb, 0x16, 0x4d, 0xa5, 0xfe, 0x13, 0x48, 0xaa, 0xf1, 0x1c, 0x47, 0xaf, 0xf4, 0x19, 0x42, |
|
44 |
+ 0xb4, 0xef, 0x02, 0x59, 0xb1, 0xea, 0x07, 0x5c, 0xbe, 0xe5, 0x08, 0x53, 0xbb, 0xe0, 0x0d, 0x56, |
|
45 |
+ 0x88, 0xd3, 0x3e, 0x65, 0x8d, 0xd6, 0x3b, 0x60, 0x82, 0xd9, 0x34, 0x6f, 0x87, 0xdc, 0x31, 0x6a, |
|
46 |
+ 0x9c, 0xc7, 0x2a, 0x71, 0x99, 0xc2, 0x2f, 0x74, 0x96, 0xcd, 0x20, 0x7b, 0x93, 0xc8, 0x25, 0x7e, |
|
47 |
+ 0xf0, 0xab, 0x46, 0x1d, 0xf5, 0xae, 0x43, 0x18, 0xfa, 0xa1, 0x4c, 0x17, 0xff, 0xa4, 0x49, 0x12, |
|
48 |
+ 0xe4, 0xbf, 0x52, 0x09, 0xe1, 0xba, 0x57, 0x0c, 0xee, 0xb5, 0x58, 0x03, 0xeb, 0xb0, 0x5d, 0x06, |
|
49 |
+ 0xd8, 0x83, 0x6e, 0x35, 0xdd, 0x86, 0x6b, 0x30, 0xd2, 0x89, 0x64, 0x3f, 0xd7, 0x8c, 0x61, 0x3a, |
|
50 |
+ 0xcc, 0x97, 0x7a, 0x21, 0xc9, 0x92, 0x7f, 0x24, 0xc6, 0x9d, 0x70, 0x2b, 0xc3, 0x98, 0x75, 0x2e |
|
51 |
+}; |
|
52 |
+ |
|
53 |
+static const uint8_t MD2[256] = { |
|
54 |
+ 0x00, 0xef, 0xb7, 0x58, 0x07, 0xe8, 0xb0, 0x5f, 0x0e, 0xe1, 0xb9, 0x56, 0x09, 0xe6, 0xbe, 0x51, |
|
55 |
+ 0x1c, 0xf3, 0xab, 0x44, 0x1b, 0xf4, 0xac, 0x43, 0x12, 0xfd, 0xa5, 0x4a, 0x15, 0xfa, 0xa2, 0x4d, |
|
56 |
+ 0x38, 0xd7, 0x8f, 0x60, 0x3f, 0xd0, 0x88, 0x67, 0x36, 0xd9, 0x81, 0x6e, 0x31, 0xde, 0x86, 0x69, |
|
57 |
+ 0x24, 0xcb, 0x93, 0x7c, 0x23, 0xcc, 0x94, 0x7b, 0x2a, 0xc5, 0x9d, 0x72, 0x2d, 0xc2, 0x9a, 0x75, |
|
58 |
+ 0x70, 0x9f, 0xc7, 0x28, 0x77, 0x98, 0xc0, 0x2f, 0x7e, 0x91, 0xc9, 0x26, 0x79, 0x96, 0xce, 0x21, |
|
59 |
+ 0x6c, 0x83, 0xdb, 0x34, 0x6b, 0x84, 0xdc, 0x33, 0x62, 0x8d, 0xd5, 0x3a, 0x65, 0x8a, 0xd2, 0x3d, |
|
60 |
+ 0x48, 0xa7, 0xff, 0x10, 0x4f, 0xa0, 0xf8, 0x17, 0x46, 0xa9, 0xf1, 0x1e, 0x41, 0xae, 0xf6, 0x19, |
|
61 |
+ 0x54, 0xbb, 0xe3, 0x0c, 0x53, 0xbc, 0xe4, 0x0b, 0x5a, 0xb5, 0xed, 0x02, 0x5d, 0xb2, 0xea, 0x05, |
|
62 |
+ 0xe0, 0x0f, 0x57, 0xb8, 0xe7, 0x08, 0x50, 0xbf, 0xee, 0x01, 0x59, 0xb6, 0xe9, 0x06, 0x5e, 0xb1, |
|
63 |
+ 0xfc, 0x13, 0x4b, 0xa4, 0xfb, 0x14, 0x4c, 0xa3, 0xf2, 0x1d, 0x45, 0xaa, 0xf5, 0x1a, 0x42, 0xad, |
|
64 |
+ 0xd8, 0x37, 0x6f, 0x80, 0xdf, 0x30, 0x68, 0x87, 0xd6, 0x39, 0x61, 0x8e, 0xd1, 0x3e, 0x66, 0x89, |
|
65 |
+ 0xc4, 0x2b, 0x73, 0x9c, 0xc3, 0x2c, 0x74, 0x9b, 0xca, 0x25, 0x7d, 0x92, 0xcd, 0x22, 0x7a, 0x95, |
|
66 |
+ 0x90, 0x7f, 0x27, 0xc8, 0x97, 0x78, 0x20, 0xcf, 0x9e, 0x71, 0x29, 0xc6, 0x99, 0x76, 0x2e, 0xc1, |
|
67 |
+ 0x8c, 0x63, 0x3b, 0xd4, 0x8b, 0x64, 0x3c, 0xd3, 0x82, 0x6d, 0x35, 0xda, 0x85, 0x6a, 0x32, 0xdd, |
|
68 |
+ 0xa8, 0x47, 0x1f, 0xf0, 0xaf, 0x40, 0x18, 0xf7, 0xa6, 0x49, 0x11, 0xfe, 0xa1, 0x4e, 0x16, 0xf9, |
|
69 |
+ 0xb4, 0x5b, 0x03, 0xec, 0xb3, 0x5c, 0x04, 0xeb, 0xba, 0x55, 0x0d, 0xe2, 0xbd, 0x52, 0x0a, 0xe5 |
|
70 |
+}; |
|
71 |
+ |
|
72 |
+static const uint8_t q0[256] = { |
|
73 |
+ 0xa9, 0x67, 0xb3, 0xe8, 0x04, 0xfd, 0xa3, 0x76, 0x9a, 0x92, 0x80, 0x78, 0xe4, 0xdd, 0xd1, 0x38, |
|
74 |
+ 0x0d, 0xc6, 0x35, 0x98, 0x18, 0xf7, 0xec, 0x6c, 0x43, 0x75, 0x37, 0x26, 0xfa, 0x13, 0x94, 0x48, |
|
75 |
+ 0xf2, 0xd0, 0x8b, 0x30, 0x84, 0x54, 0xdf, 0x23, 0x19, 0x5b, 0x3d, 0x59, 0xf3, 0xae, 0xa2, 0x82, |
|
76 |
+ 0x63, 0x01, 0x83, 0x2e, 0xd9, 0x51, 0x9b, 0x7c, 0xa6, 0xeb, 0xa5, 0xbe, 0x16, 0x0c, 0xe3, 0x61, |
|
77 |
+ 0xc0, 0x8c, 0x3a, 0xf5, 0x73, 0x2c, 0x25, 0x0b, 0xbb, 0x4e, 0x89, 0x6b, 0x53, 0x6a, 0xb4, 0xf1, |
|
78 |
+ 0xe1, 0xe6, 0xbd, 0x45, 0xe2, 0xf4, 0xb6, 0x66, 0xcc, 0x95, 0x03, 0x56, 0xd4, 0x1c, 0x1e, 0xd7, |
|
79 |
+ 0xfb, 0xc3, 0x8e, 0xb5, 0xe9, 0xcf, 0xbf, 0xba, 0xea, 0x77, 0x39, 0xaf, 0x33, 0xc9, 0x62, 0x71, |
|
80 |
+ 0x81, 0x79, 0x09, 0xad, 0x24, 0xcd, 0xf9, 0xd8, 0xe5, 0xc5, 0xb9, 0x4d, 0x44, 0x08, 0x86, 0xe7, |
|
81 |
+ 0xa1, 0x1d, 0xaa, 0xed, 0x06, 0x70, 0xb2, 0xd2, 0x41, 0x7b, 0xa0, 0x11, 0x31, 0xc2, 0x27, 0x90, |
|
82 |
+ 0x20, 0xf6, 0x60, 0xff, 0x96, 0x5c, 0xb1, 0xab, 0x9e, 0x9c, 0x52, 0x1b, 0x5f, 0x93, 0x0a, 0xef, |
|
83 |
+ 0x91, 0x85, 0x49, 0xee, 0x2d, 0x4f, 0x8f, 0x3b, 0x47, 0x87, 0x6d, 0x46, 0xd6, 0x3e, 0x69, 0x64, |
|
84 |
+ 0x2a, 0xce, 0xcb, 0x2f, 0xfc, 0x97, 0x05, 0x7a, 0xac, 0x7f, 0xd5, 0x1a, 0x4b, 0x0e, 0xa7, 0x5a, |
|
85 |
+ 0x28, 0x14, 0x3f, 0x29, 0x88, 0x3c, 0x4c, 0x02, 0xb8, 0xda, 0xb0, 0x17, 0x55, 0x1f, 0x8a, 0x7d, |
|
86 |
+ 0x57, 0xc7, 0x8d, 0x74, 0xb7, 0xc4, 0x9f, 0x72, 0x7e, 0x15, 0x22, 0x12, 0x58, 0x07, 0x99, 0x34, |
|
87 |
+ 0x6e, 0x50, 0xde, 0x68, 0x65, 0xbc, 0xdb, 0xf8, 0xc8, 0xa8, 0x2b, 0x40, 0xdc, 0xfe, 0x32, 0xa4, |
|
88 |
+ 0xca, 0x10, 0x21, 0xf0, 0xd3, 0x5d, 0x0f, 0x00, 0x6f, 0x9d, 0x36, 0x42, 0x4a, 0x5e, 0xc1, 0xe0 |
|
89 |
+}; |
|
90 |
+ |
|
91 |
+static const uint8_t q1[256] = { |
|
92 |
+ 0x75, 0xf3, 0xc6, 0xf4, 0xdb, 0x7b, 0xfb, 0xc8, 0x4a, 0xd3, 0xe6, 0x6b, 0x45, 0x7d, 0xe8, 0x4b, |
|
93 |
+ 0xd6, 0x32, 0xd8, 0xfd, 0x37, 0x71, 0xf1, 0xe1, 0x30, 0x0f, 0xf8, 0x1b, 0x87, 0xfa, 0x06, 0x3f, |
|
94 |
+ 0x5e, 0xba, 0xae, 0x5b, 0x8a, 0x00, 0xbc, 0x9d, 0x6d, 0xc1, 0xb1, 0x0e, 0x80, 0x5d, 0xd2, 0xd5, |
|
95 |
+ 0xa0, 0x84, 0x07, 0x14, 0xb5, 0x90, 0x2c, 0xa3, 0xb2, 0x73, 0x4c, 0x54, 0x92, 0x74, 0x36, 0x51, |
|
96 |
+ 0x38, 0xb0, 0xbd, 0x5a, 0xfc, 0x60, 0x62, 0x96, 0x6c, 0x42, 0xf7, 0x10, 0x7c, 0x28, 0x27, 0x8c, |
|
97 |
+ 0x13, 0x95, 0x9c, 0xc7, 0x24, 0x46, 0x3b, 0x70, 0xca, 0xe3, 0x85, 0xcb, 0x11, 0xd0, 0x93, 0xb8, |
|
98 |
+ 0xa6, 0x83, 0x20, 0xff, 0x9f, 0x77, 0xc3, 0xcc, 0x03, 0x6f, 0x08, 0xbf, 0x40, 0xe7, 0x2b, 0xe2, |
|
99 |
+ 0x79, 0x0c, 0xaa, 0x82, 0x41, 0x3a, 0xea, 0xb9, 0xe4, 0x9a, 0xa4, 0x97, 0x7e, 0xda, 0x7a, 0x17, |
|
100 |
+ 0x66, 0x94, 0xa1, 0x1d, 0x3d, 0xf0, 0xde, 0xb3, 0x0b, 0x72, 0xa7, 0x1c, 0xef, 0xd1, 0x53, 0x3e, |
|
101 |
+ 0x8f, 0x33, 0x26, 0x5f, 0xec, 0x76, 0x2a, 0x49, 0x81, 0x88, 0xee, 0x21, 0xc4, 0x1a, 0xeb, 0xd9, |
|
102 |
+ 0xc5, 0x39, 0x99, 0xcd, 0xad, 0x31, 0x8b, 0x01, 0x18, 0x23, 0xdd, 0x1f, 0x4e, 0x2d, 0xf9, 0x48, |
|
103 |
+ 0x4f, 0xf2, 0x65, 0x8e, 0x78, 0x5c, 0x58, 0x19, 0x8d, 0xe5, 0x98, 0x57, 0x67, 0x7f, 0x05, 0x64, |
|
104 |
+ 0xaf, 0x63, 0xb6, 0xfe, 0xf5, 0xb7, 0x3c, 0xa5, 0xce, 0xe9, 0x68, 0x44, 0xe0, 0x4d, 0x43, 0x69, |
|
105 |
+ 0x29, 0x2e, 0xac, 0x15, 0x59, 0xa8, 0x0a, 0x9e, 0x6e, 0x47, 0xdf, 0x34, 0x35, 0x6a, 0xcf, 0xdc, |
|
106 |
+ 0x22, 0xc9, 0xc0, 0x9b, 0x89, 0xd4, 0xed, 0xab, 0x12, 0xa2, 0x0d, 0x52, 0xbb, 0x02, 0x2f, 0xa9, |
|
107 |
+ 0xd7, 0x61, 0x1e, 0xb4, 0x50, 0x04, 0xf6, 0xc2, 0x16, 0x25, 0x86, 0x56, 0x55, 0x09, 0xbe, 0x91 |
|
108 |
+}; |
|
109 |
+ |
|
110 |
+struct AVTWOFISH *av_twofish_alloc(void) |
|
111 |
+{ |
|
112 |
+ return av_mallocz(sizeof(struct AVTWOFISH)); |
|
113 |
+} |
|
114 |
+ |
|
115 |
+const int av_twofish_size = sizeof(AVTWOFISH); |
|
116 |
+ |
|
117 |
+static uint8_t gfmul(uint8_t a, uint8_t b) |
|
118 |
+{ |
|
119 |
+ uint8_t r = 0, t; |
|
120 |
+ while (a && b) { |
|
121 |
+ if (a & 1) |
|
122 |
+ r = r ^ b; |
|
123 |
+ t = b & 0x80; |
|
124 |
+ b = b << 1; |
|
125 |
+ if (t) |
|
126 |
+ b = b ^ 0x4d; |
|
127 |
+ a = a >> 1; |
|
128 |
+ } |
|
129 |
+ return r; |
|
130 |
+} |
|
131 |
+ |
|
132 |
+static uint32_t tf_RS(uint32_t k0, uint32_t k1) |
|
133 |
+{ |
|
134 |
+ uint8_t s[4], m[8]; |
|
135 |
+ AV_WL32(m, k0); |
|
136 |
+ AV_WL32(m + 4, k1); |
|
137 |
+ s[0] = gfmul(0x01, m[0]) ^ gfmul(0xa4, m[1]) ^ gfmul(0x55, m[2]) ^ gfmul(0x87, m[3]) ^ gfmul(0x5a, m[4]) ^ gfmul(0x58, m[5]) ^ gfmul(0xdb, m[6]) ^ gfmul(0x9e, m[7]); |
|
138 |
+ s[1] = gfmul(0xa4, m[0]) ^ gfmul(0x56, m[1]) ^ gfmul(0x82, m[2]) ^ gfmul(0xf3, m[3]) ^ gfmul(0x1e, m[4]) ^ gfmul(0xc6, m[5]) ^ gfmul(0x68, m[6]) ^ gfmul(0xe5, m[7]); |
|
139 |
+ s[2] = gfmul(0x02, m[0]) ^ gfmul(0xa1, m[1]) ^ gfmul(0xfc, m[2]) ^ gfmul(0xc1, m[3]) ^ gfmul(0x47, m[4]) ^ gfmul(0xae, m[5]) ^ gfmul(0x3d, m[6]) ^ gfmul(0x19, m[7]); |
|
140 |
+ s[3] = gfmul(0xa4, m[0]) ^ gfmul(0x55, m[1]) ^ gfmul(0x87, m[2]) ^ gfmul(0x5a, m[3]) ^ gfmul(0x58, m[4]) ^ gfmul(0xdb, m[5]) ^ gfmul(0x9e, m[6]) ^ gfmul(0x03, m[7]); |
|
141 |
+ return AV_RL32(s); |
|
142 |
+} |
|
143 |
+ |
|
144 |
+static uint32_t tf_h(uint32_t X, uint32_t L[4], int k) |
|
145 |
+{ |
|
146 |
+ uint8_t y[4], l[4]; |
|
147 |
+ AV_WL32(y, X); |
|
148 |
+ if (k == 4) { |
|
149 |
+ AV_WL32(l, L[3]); |
|
150 |
+ y[0] = q1[y[0]] ^ l[0]; |
|
151 |
+ y[1] = q0[y[1]] ^ l[1]; |
|
152 |
+ y[2] = q0[y[2]] ^ l[2]; |
|
153 |
+ y[3] = q1[y[3]] ^ l[3]; |
|
154 |
+ } |
|
155 |
+ if (k >= 3) { |
|
156 |
+ AV_WL32(l, L[2]); |
|
157 |
+ y[0] = q1[y[0]] ^ l[0]; |
|
158 |
+ y[1] = q1[y[1]] ^ l[1]; |
|
159 |
+ y[2] = q0[y[2]] ^ l[2]; |
|
160 |
+ y[3] = q0[y[3]] ^ l[3]; |
|
161 |
+ } |
|
162 |
+ AV_WL32(l, L[1]); |
|
163 |
+ y[0] = q1[q0[q0[y[0]] ^ l[0]] ^ (L[0] & 0xff)]; |
|
164 |
+ y[1] = q0[q0[q1[y[1]] ^ l[1]] ^ ((L[0] >> 8) & 0xff)]; |
|
165 |
+ y[2] = q1[q1[q0[y[2]] ^ l[2]] ^ ((L[0] >> 16) & 0xff)]; |
|
166 |
+ y[3] = q0[q1[q1[y[3]] ^ l[3]] ^ (L[0] >> 24)]; |
|
167 |
+ |
|
168 |
+ l[0] = y[0] ^ MD2[y[1]] ^ MD1[y[2]] ^ MD1[y[3]]; |
|
169 |
+ l[1] = MD1[y[0]] ^ MD2[y[1]] ^ MD2[y[2]] ^ y[3]; |
|
170 |
+ l[2] = MD2[y[0]] ^ MD1[y[1]] ^ y[2] ^ MD2[y[3]]; |
|
171 |
+ l[3] = MD2[y[0]] ^ y[1] ^ MD2[y[2]] ^ MD1[y[3]]; |
|
172 |
+ |
|
173 |
+ return AV_RL32(l); |
|
174 |
+} |
|
175 |
+ |
|
176 |
+static void twofish_encrypt(AVTWOFISH *cs, uint8_t *dst, const uint8_t *src) |
|
177 |
+{ |
|
178 |
+ uint32_t P[4], t0, t1; |
|
179 |
+ int i; |
|
180 |
+ P[0] = AV_RL32(src) ^ cs->K[0]; |
|
181 |
+ P[1] = AV_RL32(src + 4) ^ cs->K[1]; |
|
182 |
+ P[2] = AV_RL32(src + 8) ^ cs->K[2]; |
|
183 |
+ P[3] = AV_RL32(src + 12) ^ cs->K[3]; |
|
184 |
+ for (i = 0; i < 16; i += 2) { |
|
185 |
+ t0 = tf_h(P[0], cs->S, cs->ksize); |
|
186 |
+ t1 = tf_h(LR(P[1], 8), cs->S, cs->ksize); |
|
187 |
+ P[2] = RR(P[2] ^ (t0 + t1 + cs->K[2 * i + 8]), 1); |
|
188 |
+ P[3] = LR(P[3], 1) ^ (t0 + 2 * t1 + cs->K[2 * i + 9]); |
|
189 |
+ t0 = tf_h(P[2], cs->S, cs->ksize); |
|
190 |
+ t1 = tf_h(LR(P[3], 8), cs->S, cs->ksize); |
|
191 |
+ P[0] = RR(P[0] ^ (t0 + t1 + cs->K[2 * i + 10]), 1); |
|
192 |
+ P[1] = LR(P[1], 1) ^ (t0 + 2 * t1 + cs->K[2 * i + 11]); |
|
193 |
+ } |
|
194 |
+ P[2] ^= cs->K[4]; |
|
195 |
+ P[3] ^= cs->K[5]; |
|
196 |
+ P[0] ^= cs->K[6]; |
|
197 |
+ P[1] ^= cs->K[7]; |
|
198 |
+ AV_WL32(dst, P[2]); |
|
199 |
+ AV_WL32(dst + 4, P[3]); |
|
200 |
+ AV_WL32(dst + 8, P[0]); |
|
201 |
+ AV_WL32(dst + 12, P[1]); |
|
202 |
+} |
|
203 |
+ |
|
204 |
+static void twofish_decrypt(AVTWOFISH *cs, uint8_t *dst, const uint8_t *src, uint8_t *iv) |
|
205 |
+{ |
|
206 |
+ uint32_t P[4], t0, t1; |
|
207 |
+ int i; |
|
208 |
+ P[2] = AV_RL32(src) ^ cs->K[4]; |
|
209 |
+ P[3] = AV_RL32(src + 4) ^ cs->K[5]; |
|
210 |
+ P[0] = AV_RL32(src + 8) ^ cs->K[6]; |
|
211 |
+ P[1] = AV_RL32(src + 12) ^ cs->K[7]; |
|
212 |
+ for (i = 15; i >= 0; i -= 2) { |
|
213 |
+ t0 = tf_h(P[2], cs->S, cs->ksize); |
|
214 |
+ t1 = tf_h(LR(P[3], 8), cs->S, cs->ksize); |
|
215 |
+ P[0] = LR(P[0], 1) ^ (t0 + t1 + cs->K[2 * i + 8]); |
|
216 |
+ P[1] = RR(P[1] ^ (t0 + 2 * t1 + cs->K[2 * i + 9]), 1); |
|
217 |
+ t0 = tf_h(P[0], cs->S, cs->ksize); |
|
218 |
+ t1 = tf_h(LR(P[1], 8), cs->S, cs->ksize); |
|
219 |
+ P[2] = LR(P[2], 1) ^ (t0 + t1 + cs->K[2 * i + 6]); |
|
220 |
+ P[3] = RR(P[3] ^ (t0 + 2 * t1 + cs->K[2 * i + 7]), 1); |
|
221 |
+ } |
|
222 |
+ P[0] ^= cs->K[0]; |
|
223 |
+ P[1] ^= cs->K[1]; |
|
224 |
+ P[2] ^= cs->K[2]; |
|
225 |
+ P[3] ^= cs->K[3]; |
|
226 |
+ if (iv) { |
|
227 |
+ P[0] ^= AV_RL32(iv); |
|
228 |
+ P[1] ^= AV_RL32(iv + 4); |
|
229 |
+ P[2] ^= AV_RL32(iv + 8); |
|
230 |
+ P[3] ^= AV_RL32(iv + 12); |
|
231 |
+ memcpy(iv, src, 16); |
|
232 |
+ } |
|
233 |
+ AV_WL32(dst, P[2]); |
|
234 |
+ AV_WL32(dst + 4, P[3]); |
|
235 |
+ AV_WL32(dst + 8, P[0]); |
|
236 |
+ AV_WL32(dst + 12, P[1]); |
|
237 |
+} |
|
238 |
+ |
|
239 |
+av_cold int av_twofish_init(AVTWOFISH *cs, const uint8_t *key, int key_bits) |
|
240 |
+{ |
|
241 |
+ int i; |
|
242 |
+ uint8_t keypad[32]; |
|
243 |
+ uint32_t Key[8], Me[4], Mo[4], A, B; |
|
244 |
+ const uint32_t rho = 0x01010101; |
|
245 |
+ if (key_bits < 0) |
|
246 |
+ return -1; |
|
247 |
+ if (key_bits <= 128) { |
|
248 |
+ cs->ksize = 2; |
|
249 |
+ } else if (key_bits <= 192) { |
|
250 |
+ cs->ksize = 3; |
|
251 |
+ } else { |
|
252 |
+ cs->ksize = 4; |
|
253 |
+ } |
|
254 |
+ memset(keypad, 0, sizeof(keypad)); |
|
255 |
+ if (key_bits <= 256) { |
|
256 |
+ memcpy(keypad, key, key_bits >> 3); |
|
257 |
+ } else { |
|
258 |
+ memcpy(keypad, key, 32); |
|
259 |
+ } |
|
260 |
+ for (i = 0; i < 2 * cs->ksize ; i++) |
|
261 |
+ Key[i] = AV_RL32(keypad + 4 * i); |
|
262 |
+ for (i = 0; i < cs->ksize; i++) { |
|
263 |
+ Me[i] = Key[2 * i]; |
|
264 |
+ Mo[i] = Key[2 * i + 1]; |
|
265 |
+ cs->S[cs->ksize - i - 1] = tf_RS(Me[i], Mo[i]); |
|
266 |
+ } |
|
267 |
+ for (i = 0; i < 20; i++) { |
|
268 |
+ A = tf_h((2 * i) * rho, Me, cs->ksize); |
|
269 |
+ B = tf_h((2 * i + 1) * rho, Mo, cs->ksize); |
|
270 |
+ B = LR(B, 8); |
|
271 |
+ cs->K[2 * i] = A + B; |
|
272 |
+ cs->K[2 * i + 1] = LR((A + (2 * B)), 9); |
|
273 |
+ } |
|
274 |
+ if (cs->ksize << 6 != key_bits) { |
|
275 |
+ return 1; |
|
276 |
+ } else { |
|
277 |
+ return 0; |
|
278 |
+ } |
|
279 |
+} |
|
280 |
+ |
|
281 |
+void av_twofish_crypt(AVTWOFISH *cs, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt) |
|
282 |
+{ |
|
283 |
+ int i; |
|
284 |
+ while (count--) { |
|
285 |
+ if (decrypt) { |
|
286 |
+ twofish_decrypt(cs, dst, src, iv); |
|
287 |
+ } else { |
|
288 |
+ if (iv) { |
|
289 |
+ for (i = 0; i < 16; i++) |
|
290 |
+ dst[i] = src[i] ^ iv[i]; |
|
291 |
+ twofish_encrypt(cs, dst, dst); |
|
292 |
+ memcpy(iv, dst, 16); |
|
293 |
+ } else { |
|
294 |
+ twofish_encrypt(cs, dst, src); |
|
295 |
+ } |
|
296 |
+ } |
|
297 |
+ src = src + 16; |
|
298 |
+ dst = dst + 16; |
|
299 |
+ } |
|
300 |
+} |
|
301 |
+ |
|
302 |
+#ifdef TEST |
|
303 |
+#include<stdio.h> |
|
304 |
+#include<stdlib.h> |
|
305 |
+#include"log.h" |
|
306 |
+ |
|
307 |
+int main(int argc, char *argv[]) |
|
308 |
+{ |
|
309 |
+ uint8_t Key[32] = {0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10, 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff |
|
310 |
+ }; |
|
311 |
+ const uint8_t rct[6][16] = { |
|
312 |
+ {0x9f, 0x58, 0x9f, 0x5c, 0xf6, 0x12, 0x2c, 0x32, 0xb6, 0xbf, 0xec, 0x2f, 0x2a, 0xe8, 0xc3, 0x5a}, |
|
313 |
+ {0xcf, 0xd1, 0xd2, 0xe5, 0xa9, 0xbe, 0x9c, 0xdf, 0x50, 0x1f, 0x13, 0xb8, 0x92, 0xbd, 0x22, 0x48}, |
|
314 |
+ {0x37, 0x52, 0x7b, 0xe0, 0x05, 0x23, 0x34, 0xb8, 0x9f, 0x0c, 0xfc, 0xca, 0xe8, 0x7c, 0xfa, 0x20}, |
|
315 |
+ {0x5d, 0x9d, 0x4e, 0xef, 0xfa, 0x91, 0x51, 0x57, 0x55, 0x24, 0xf1, 0x15, 0x81, 0x5a, 0x12, 0xe0}, |
|
316 |
+ {0xe7, 0x54, 0x49, 0x21, 0x2b, 0xee, 0xf9, 0xf4, 0xa3, 0x90, 0xbd, 0x86, 0x0a, 0x64, 0x09, 0x41}, |
|
317 |
+ {0x37, 0xfe, 0x26, 0xff, 0x1c, 0xf6, 0x61, 0x75, 0xf5, 0xdd, 0xf4, 0xc3, 0x3b, 0x97, 0xa2, 0x05} |
|
318 |
+ }; |
|
319 |
+ uint8_t temp[32], iv[16], rpt[32] = {0}; |
|
320 |
+ const int kbits[3] = {128, 192, 256}; |
|
321 |
+ int i, j, err = 0; |
|
322 |
+ AVTWOFISH *cs; |
|
323 |
+ cs = av_twofish_alloc(); |
|
324 |
+ if (!cs) |
|
325 |
+ return 1; |
|
326 |
+ for (j = 1; j < 3; j++) { |
|
327 |
+ av_twofish_init(cs, Key, kbits[j]); |
|
328 |
+ av_twofish_crypt(cs, temp, rpt, 1, NULL, 0); |
|
329 |
+ for (i = 0; i < 16; i++) { |
|
330 |
+ if (rct[j][i] != temp[i]) { |
|
331 |
+ av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rct[j][i], temp[i]); |
|
332 |
+ err = 1; |
|
333 |
+ } |
|
334 |
+ } |
|
335 |
+ av_twofish_crypt(cs, temp, rct[j], 1, NULL, 1); |
|
336 |
+ for (i = 0; i < 16; i++) { |
|
337 |
+ if (rpt[i] != temp[i]) { |
|
338 |
+ av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rpt[i], temp[i]); |
|
339 |
+ err = 1; |
|
340 |
+ } |
|
341 |
+ } |
|
342 |
+ } |
|
343 |
+ for (j = 0; j < 3; j++) { |
|
344 |
+ memset(Key, 0, sizeof(Key)); |
|
345 |
+ memset(rpt, 0, sizeof(rpt)); |
|
346 |
+ for (i = 1; i < 50; i++) { |
|
347 |
+ av_twofish_init(cs, Key, kbits[j]); |
|
348 |
+ av_twofish_crypt(cs, temp, rpt, 1, NULL, 0); |
|
349 |
+ memcpy(Key+16,Key,(kbits[j]-128) >> 3); |
|
350 |
+ memcpy(Key,rpt,16); |
|
351 |
+ memcpy(rpt,temp,16); |
|
352 |
+ } |
|
353 |
+ for (i = 0; i < 16; i++) { |
|
354 |
+ if (rct[3 + j][i] != temp[i]) { |
|
355 |
+ av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rct[3 + j][i], temp[i]); |
|
356 |
+ err = 1; |
|
357 |
+ } |
|
358 |
+ } |
|
359 |
+ } |
|
360 |
+ memset(rpt, 0, sizeof(rpt)); |
|
361 |
+ memcpy(iv, "HALLO123HALLO123", 16); |
|
362 |
+ av_twofish_crypt(cs, temp, rpt, 2, iv, 0); |
|
363 |
+ memcpy(iv, "HALLO123HALLO123", 16); |
|
364 |
+ av_twofish_crypt(cs, temp, temp, 2, iv, 1); |
|
365 |
+ for (i = 0; i < 32; i++) { |
|
366 |
+ if (rpt[i] != temp[i]) { |
|
367 |
+ av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rpt[i], temp[i]); |
|
368 |
+ err = 1; |
|
369 |
+ } |
|
370 |
+ } |
|
371 |
+ av_free(cs); |
|
372 |
+ return err; |
|
373 |
+} |
|
374 |
+#endif |
0 | 375 |
new file mode 100644 |
... | ... |
@@ -0,0 +1,70 @@ |
0 |
+/* |
|
1 |
+ * An implementation of the TwoFish algorithm |
|
2 |
+ * Copyright (c) 2015 Supraja Meedinti |
|
3 |
+ * |
|
4 |
+ * This file is part of FFmpeg. |
|
5 |
+ * |
|
6 |
+ * FFmpeg is free software; you can redistribute it and/or |
|
7 |
+ * modify it under the terms of the GNU Lesser General Public |
|
8 |
+ * License as published by the Free Software Foundation; either |
|
9 |
+ * version 2.1 of the License, or (at your option) any later version. |
|
10 |
+ * |
|
11 |
+ * FFmpeg is distributed in the hope that it will be useful, |
|
12 |
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
13 |
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
14 |
+ * Lesser General Public License for more details. |
|
15 |
+ * |
|
16 |
+ * You should have received a copy of the GNU Lesser General Public |
|
17 |
+ * License along with FFmpeg; if not, write to the Free Software |
|
18 |
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
19 |
+ */ |
|
20 |
+ |
|
21 |
+#ifndef AVUTIL_TWOFISH_H |
|
22 |
+#define AVUTIL_TWOFISH_H |
|
23 |
+ |
|
24 |
+#include <stdint.h> |
|
25 |
+ |
|
26 |
+ |
|
27 |
+/** |
|
28 |
+ * @file |
|
29 |
+ * @brief Public header for libavutil TWOFISH algorithm |
|
30 |
+ * @defgroup lavu_twofish TWOFISH |
|
31 |
+ * @ingroup lavu_crypto |
|
32 |
+ * @{ |
|
33 |
+ */ |
|
34 |
+ |
|
35 |
+extern const int av_twofish_size; |
|
36 |
+ |
|
37 |
+struct AVTWOFISH; |
|
38 |
+ |
|
39 |
+/** |
|
40 |
+ * Allocate an AVTWOFISH context |
|
41 |
+ * To free the struct: av_free(ptr) |
|
42 |
+ */ |
|
43 |
+struct AVTWOFISH *av_twofish_alloc(void); |
|
44 |
+ |
|
45 |
+/** |
|
46 |
+ * Initialize an AVTWOFISH context. |
|
47 |
+ * |
|
48 |
+ * @param ctx an AVTWOFISH context |
|
49 |
+ * @param key a key of size ranging from 1 to 32 bytes used for encryption/decryption |
|
50 |
+ * @param key_bits number of keybits: 128, 192, 256 If less than the required, padded with zeroes to nearest valid value; return value is 0 if key_bits is 128/192/256, -1 if less than 0, 1 otherwise |
|
51 |
+ */ |
|
52 |
+int av_twofish_init(struct AVTWOFISH *ctx, const uint8_t *key, int key_bits); |
|
53 |
+ |
|
54 |
+/** |
|
55 |
+ * Encrypt or decrypt a buffer using a previously initialized context |
|
56 |
+ * |
|
57 |
+ * @param ctx an AVTWOFISH context |
|
58 |
+ * @param dst destination array, can be equal to src |
|
59 |
+ * @param src source array, can be equal to dst |
|
60 |
+ * @param count number of 16 byte blocks |
|
61 |
+ * @paran iv initialization vector for CBC mode, NULL for ECB mode |
|
62 |
+ * @param decrypt 0 for encryption, 1 for decryption |
|
63 |
+ */ |
|
64 |
+void av_twofish_crypt(struct AVTWOFISH *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t* iv, int decrypt); |
|
65 |
+ |
|
66 |
+/** |
|
67 |
+ * @} |
|
68 |
+ */ |
|
69 |
+#endif /* AVUTIL_TWOFISH_H */ |