33 for (i = 0; i < 4; i++)
47 uint32_t
delta = 0x9E3779B9, sum = delta * 32;
49 for (i = 0; i < 32; i++) {
50 v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + ctx->
key[(sum >> 11) & 3]);
52 v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + ctx->
key[sum & 3]);
60 uint32_t sum = 0,
delta = 0x9E3779B9;
62 for (i = 0; i < 32; i++) {
63 v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + ctx->
key[sum & 3]);
65 v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + ctx->
key[(sum >> 11) & 3]);
88 for (i = 0; i < 8; i++)
89 dst[i] = src[i] ^ iv[i];
104 #define XTEA_NUM_TESTS 6
106 static const uint8_t xtea_test_key[XTEA_NUM_TESTS][16] = {
107 { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
108 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
109 { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
110 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
111 { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
112 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
113 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
114 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
115 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
116 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
117 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
118 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
121 static const uint8_t xtea_test_pt[XTEA_NUM_TESTS][8] = {
122 { 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48 },
123 { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
124 { 0x5a, 0x5b, 0x6e, 0x27, 0x89, 0x48, 0xd7, 0x7f },
125 { 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48 },
126 { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
127 { 0x70, 0xe1, 0x22, 0x5d, 0x6e, 0x4e, 0x76, 0x55 }
130 static const uint8_t xtea_test_ct[XTEA_NUM_TESTS][8] = {
131 { 0x49, 0x7d, 0xf3, 0xd0, 0x72, 0x61, 0x2c, 0xb5 },
132 { 0xe7, 0x8f, 0x2d, 0x13, 0x74, 0x43, 0x41, 0xd8 },
133 { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
134 { 0xa0, 0x39, 0x05, 0x89, 0xf8, 0xb8, 0xef, 0xa5 },
135 { 0xed, 0x23, 0x37, 0x5a, 0x82, 0x1a, 0x8c, 0x2d },
136 { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 }
144 if (memcmp(dst, ref, 8*len)) {
146 printf(
"%s failed\ngot ", test);
147 for (i = 0; i < 8*
len; i++)
148 printf(
"%02x ", dst[i]);
149 printf(
"\nexpected ");
150 for (i = 0; i < 8*
len; i++)
151 printf(
"%02x ", ref[i]);
162 const uint8_t src[32] =
"HelloWorldHelloWorldHelloWorld";
166 for (i = 0; i < XTEA_NUM_TESTS; i++) {
169 test_xtea(&ctx, buf, xtea_test_pt[i], xtea_test_ct[i], 1,
NULL, 0,
"encryption");
170 test_xtea(&ctx, buf, xtea_test_ct[i], xtea_test_pt[i], 1,
NULL, 1,
"decryption");
173 memcpy(iv,
"HALLO123", 8);
177 memcpy(iv,
"HALLO123", 8);
178 test_xtea(&ctx, pl, ct, src, 4, iv, 1,
"CBC decryption");
180 memcpy(iv,
"HALLO123", 8);
181 test_xtea(&ctx, ct, ct, src, 4, iv, 1,
"CBC inplace decryption");
183 printf(
"Test encryption/decryption success.\n");
void av_xtea_crypt(AVXTEA *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)
Encrypt or decrypt a buffer using a previously initialized context.
static void xtea_crypt_ecb(AVXTEA *ctx, uint8_t *dst, const uint8_t *src, int decrypt, uint8_t *iv)
int main(int argc, char **argv)
void av_xtea_init(AVXTEA *ctx, const uint8_t key[16])
Initialize an AVXTEA context.
static void test(const char *pattern, const char *host)
common internal and external API header