34 for (i = 0; i < 4; i++)
43 uint32_t k0 = ctx->
key[0];
44 uint32_t k1 = ctx->
key[1];
45 uint32_t k2 = ctx->
key[2];
46 uint32_t k3 = ctx->
key[3];
55 uint32_t
delta = 0x9E3779B9
U, sum = delta * 32;
57 for (i = 0; i < 32; i++) {
58 v1 -= (((v0 << 4) ^ (v0 >> 5)) +
v0) ^ (sum + ctx->
key[(sum >> 11) & 3]);
60 v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + ctx->
key[sum & 3]);
63 #define DSTEP(SUM, K0, K1) \
64 v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (SUM + K0); \
65 v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (SUM - 0x9E3779B9U + K1)
67 DSTEP(0xC6EF3720U, k2, k3);
68 DSTEP(0x28B7BD67U, k3, k2);
69 DSTEP(0x8A8043AEU, k0, k1);
70 DSTEP(0xEC48C9F5U, k1, k0);
71 DSTEP(0x4E11503CU, k2, k3);
72 DSTEP(0xAFD9D683U, k2, k2);
73 DSTEP(0x11A25CCAU, k3, k1);
74 DSTEP(0x736AE311U, k0, k0);
75 DSTEP(0xD5336958U, k1, k3);
76 DSTEP(0x36FBEF9FU, k1, k2);
77 DSTEP(0x98C475E6U, k2, k1);
78 DSTEP(0xFA8CFC2DU, k3, k0);
79 DSTEP(0x5C558274U, k0, k3);
80 DSTEP(0xBE1E08BBU, k1, k2);
81 DSTEP(0x1FE68F02U, k1, k1);
82 DSTEP(0x81AF1549U, k2, k0);
83 DSTEP(0xE3779B90U, k3, k3);
84 DSTEP(0x454021D7U, k0, k2);
85 DSTEP(0xA708A81EU, k1, k1);
86 DSTEP(0x08D12E65U, k1, k0);
87 DSTEP(0x6A99B4ACU, k2, k3);
88 DSTEP(0xCC623AF3U, k3, k2);
89 DSTEP(0x2E2AC13AU, k0, k1);
90 DSTEP(0x8FF34781U, k0, k0);
91 DSTEP(0xF1BBCDC8U, k1, k3);
92 DSTEP(0x5384540FU, k2, k2);
93 DSTEP(0xB54CDA56U, k3, k1);
94 DSTEP(0x1715609DU, k0, k0);
95 DSTEP(0x78DDE6E4U, k0, k3);
96 DSTEP(0xDAA66D2BU, k1, k2);
97 DSTEP(0x3C6EF372U, k2, k1);
98 DSTEP(0x9E3779B9U, k3, k0);
108 uint32_t sum = 0,
delta = 0x9E3779B9
U;
110 for (i = 0; i < 32; i++) {
111 v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + ctx->
key[sum & 3]);
113 v1 += (((v0 << 4) ^ (v0 >> 5)) +
v0) ^ (sum + ctx->
key[(sum >> 11) & 3]);
116 #define ESTEP(SUM, K0, K1) \
117 v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (SUM + K0);\
118 v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (SUM + 0x9E3779B9U + K1)
119 ESTEP(0x00000000U, k0, k3);
120 ESTEP(0x9E3779B9U, k1, k2);
121 ESTEP(0x3C6EF372U, k2, k1);
122 ESTEP(0xDAA66D2BU, k3, k0);
123 ESTEP(0x78DDE6E4U, k0, k0);
124 ESTEP(0x1715609DU, k1, k3);
125 ESTEP(0xB54CDA56U, k2, k2);
126 ESTEP(0x5384540FU, k3, k1);
127 ESTEP(0xF1BBCDC8U, k0, k0);
128 ESTEP(0x8FF34781U, k1, k0);
129 ESTEP(0x2E2AC13AU, k2, k3);
130 ESTEP(0xCC623AF3U, k3, k2);
131 ESTEP(0x6A99B4ACU, k0, k1);
132 ESTEP(0x08D12E65U, k1, k1);
133 ESTEP(0xA708A81EU, k2, k0);
134 ESTEP(0x454021D7U, k3, k3);
135 ESTEP(0xE3779B90U, k0, k2);
136 ESTEP(0x81AF1549U, k1, k1);
137 ESTEP(0x1FE68F02U, k2, k1);
138 ESTEP(0xBE1E08BBU, k3, k0);
139 ESTEP(0x5C558274U, k0, k3);
140 ESTEP(0xFA8CFC2DU, k1, k2);
141 ESTEP(0x98C475E6U, k2, k1);
142 ESTEP(0x36FBEF9FU, k3, k1);
143 ESTEP(0xD5336958U, k0, k0);
144 ESTEP(0x736AE311U, k1, k3);
145 ESTEP(0x11A25CCAU, k2, k2);
146 ESTEP(0xAFD9D683U, k3, k2);
147 ESTEP(0x4E11503CU, k0, k1);
148 ESTEP(0xEC48C9F5U, k1, k0);
149 ESTEP(0x8A8043AEU, k2, k3);
150 ESTEP(0x28B7BD67U, k3, k2);
173 for (i = 0; i < 8; i++)
174 dst[i] = src[i] ^ iv[i];
189 #define XTEA_NUM_TESTS 6
191 static const uint8_t xtea_test_key[XTEA_NUM_TESTS][16] = {
192 { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
193 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
194 { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
195 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
196 { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
197 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
198 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
199 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
200 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
201 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
202 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
203 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
206 static const uint8_t xtea_test_pt[XTEA_NUM_TESTS][8] = {
207 { 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48 },
208 { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
209 { 0x5a, 0x5b, 0x6e, 0x27, 0x89, 0x48, 0xd7, 0x7f },
210 { 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48 },
211 { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
212 { 0x70, 0xe1, 0x22, 0x5d, 0x6e, 0x4e, 0x76, 0x55 }
215 static const uint8_t xtea_test_ct[XTEA_NUM_TESTS][8] = {
216 { 0x49, 0x7d, 0xf3, 0xd0, 0x72, 0x61, 0x2c, 0xb5 },
217 { 0xe7, 0x8f, 0x2d, 0x13, 0x74, 0x43, 0x41, 0xd8 },
218 { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
219 { 0xa0, 0x39, 0x05, 0x89, 0xf8, 0xb8, 0xef, 0xa5 },
220 { 0xed, 0x23, 0x37, 0x5a, 0x82, 0x1a, 0x8c, 0x2d },
221 { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 }
229 if (memcmp(dst, ref, 8*len)) {
231 printf(
"%s failed\ngot ", test);
232 for (i = 0; i < 8*
len; i++)
233 printf(
"%02x ", dst[i]);
234 printf(
"\nexpected ");
235 for (i = 0; i < 8*
len; i++)
236 printf(
"%02x ", ref[i]);
247 const uint8_t src[32] =
"HelloWorldHelloWorldHelloWorld";
251 for (i = 0; i < XTEA_NUM_TESTS; i++) {
254 test_xtea(&ctx, buf, xtea_test_pt[i], xtea_test_ct[i], 1, NULL, 0,
"encryption");
255 test_xtea(&ctx, buf, xtea_test_ct[i], xtea_test_pt[i], 1, NULL, 1,
"decryption");
258 memcpy(iv,
"HALLO123", 8);
262 memcpy(iv,
"HALLO123", 8);
263 test_xtea(&ctx, pl, ct, src, 4, iv, 1,
"CBC decryption");
265 memcpy(iv,
"HALLO123", 8);
266 test_xtea(&ctx, ct, ct, src, 4, iv, 1,
"CBC inplace decryption");
269 printf(
"Test encryption/decryption success.\n");