AV_WB32(dst + 4, l);
}
-static void decipher(AVCAST5* cs, uint8_t* dst, const uint8_t* src)
+static void decipher(AVCAST5* cs, uint8_t* dst, const uint8_t* src, uint8_t *iv)
{
uint32_t f, I, r, l;
l = AV_RB32(src);
F3(r, l, 3);
F2(l, r, 2);
F1(r, l, 1);
+ if (iv) {
+ r ^= AV_RB32(iv);
+ l ^= AV_RB32(iv + 4);
+ memcpy(iv, src, 8);
+ }
AV_WB32(dst, r);
AV_WB32(dst + 4, l);
}
return 0;
}
+void av_cast5_crypt2(AVCAST5* cs, uint8_t* dst, const uint8_t* src, int count, uint8_t *iv, int decrypt)
+{
+ int i;
+ while (count--) {
+ if (decrypt) {
+ decipher(cs, dst, src, iv);
+ } else {
+ if (iv) {
+ for (i = 0; i < 8; i++)
+ dst[i] = src[i] ^ iv[i];
+ encipher(cs, dst, dst);
+ memcpy(iv, dst, 8);
+ } else {
+ encipher(cs, dst, src);
+ }
+ }
+ src = src + 8;
+ dst = dst + 8;
+ }
+}
void av_cast5_crypt(AVCAST5* cs, uint8_t* dst, const uint8_t* src, int count, int decrypt)
{
while (count--) {
if (decrypt){
- decipher(cs, dst, src);
+ decipher(cs, dst, src, NULL);
} else {
encipher(cs, dst, src);
}
{0xee, 0xa9, 0xd0, 0xa2, 0x49, 0xfd, 0x3b, 0xa6, 0xb3, 0x43, 0x6f, 0xb8, 0x9d, 0x6d, 0xca, 0x92},
{0xb2, 0xc9, 0x5e, 0xb0, 0x0c, 0x31, 0xad, 0x71, 0x80, 0xac, 0x05, 0xb8, 0xe8, 0x3d, 0x69, 0x6e}
};
+ const uint8_t iv[8] = {0xee, 0xa9, 0xd0, 0xa2, 0x49, 0xfd, 0x3b, 0xa6};
static uint8_t rpt2[2][16];
int i, j, err = 0;
static int key_bits[3] = {128, 80, 40};
}
}
}
+ for (j = 0; j < 3; j++) {
+
+ av_cast5_init(cs, Key[j], key_bits[j]);
+ memcpy(temp, iv, 8);
+ av_cast5_crypt2(cs, rpt2[0], rct2[0], 2, temp, 0);
+ memcpy(temp, iv, 8);
+ av_cast5_crypt2(cs, rpt2[0], rpt2[0], 2, temp, 1);
+ for (i = 0; i < 16; i++) {
+ if (rct2[0][i] != rpt2[0][i]) {
+ av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rct2[0][i], rpt2[0][i]);
+ err = 1;
+ }
+ }
+ }
av_free(cs);
return err;
}