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libavutil: Added cbc mode to cast128
Signed-off-by: Supraja Meedinti <supraja0493@gmail.com> Previous version reviewed-by: Giorgio Vazzana <mywing81@gmail.com> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -416,7 +416,7 @@ static void encipher(AVCAST5* cs, uint8_t* dst, const uint8_t* src)
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AV_WB32(dst + 4, l);
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}
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static void decipher(AVCAST5* cs, uint8_t* dst, const uint8_t* src)
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static void decipher(AVCAST5* cs, uint8_t* dst, const uint8_t* src, uint8_t *iv)
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{
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uint32_t f, I, r, l;
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l = AV_RB32(src);
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@ -439,6 +439,11 @@ static void decipher(AVCAST5* cs, uint8_t* dst, const uint8_t* src)
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F3(r, l, 3);
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F2(l, r, 2);
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F1(r, l, 1);
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if (iv) {
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r ^= AV_RB32(iv);
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l ^= AV_RB32(iv + 4);
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memcpy(iv, src, 8);
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}
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AV_WB32(dst, r);
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AV_WB32(dst + 4, l);
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}
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@ -468,11 +473,31 @@ av_cold int av_cast5_init(AVCAST5* cs, const uint8_t *key, int key_bits)
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return 0;
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}
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void av_cast5_crypt2(AVCAST5* cs, uint8_t* dst, const uint8_t* src, int count, uint8_t *iv, int decrypt)
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{
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int i;
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while (count--) {
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if (decrypt) {
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decipher(cs, dst, src, iv);
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} else {
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if (iv) {
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for (i = 0; i < 8; i++)
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dst[i] = src[i] ^ iv[i];
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encipher(cs, dst, dst);
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memcpy(iv, dst, 8);
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} else {
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encipher(cs, dst, src);
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}
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}
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src = src + 8;
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dst = dst + 8;
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}
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}
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void av_cast5_crypt(AVCAST5* cs, uint8_t* dst, const uint8_t* src, int count, int decrypt)
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{
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while (count--) {
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if (decrypt){
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decipher(cs, dst, src);
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decipher(cs, dst, src, NULL);
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} else {
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encipher(cs, dst, src);
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}
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@ -504,6 +529,7 @@ int main(int argc, char** argv)
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{0xee, 0xa9, 0xd0, 0xa2, 0x49, 0xfd, 0x3b, 0xa6, 0xb3, 0x43, 0x6f, 0xb8, 0x9d, 0x6d, 0xca, 0x92},
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{0xb2, 0xc9, 0x5e, 0xb0, 0x0c, 0x31, 0xad, 0x71, 0x80, 0xac, 0x05, 0xb8, 0xe8, 0x3d, 0x69, 0x6e}
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};
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const uint8_t iv[8] = {0xee, 0xa9, 0xd0, 0xa2, 0x49, 0xfd, 0x3b, 0xa6};
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static uint8_t rpt2[2][16];
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int i, j, err = 0;
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static int key_bits[3] = {128, 80, 40};
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@ -547,6 +573,20 @@ int main(int argc, char** argv)
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}
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}
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}
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for (j = 0; j < 3; j++) {
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av_cast5_init(cs, Key[j], key_bits[j]);
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memcpy(temp, iv, 8);
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av_cast5_crypt2(cs, rpt2[0], rct2[0], 2, temp, 0);
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memcpy(temp, iv, 8);
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av_cast5_crypt2(cs, rpt2[0], rpt2[0], 2, temp, 1);
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for (i = 0; i < 16; i++) {
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if (rct2[0][i] != rpt2[0][i]) {
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av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rct2[0][i], rpt2[0][i]);
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err = 1;
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}
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}
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}
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av_free(cs);
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return err;
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}
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@ -52,7 +52,7 @@ struct AVCAST5 *av_cast5_alloc(void);
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int av_cast5_init(struct AVCAST5 *ctx, const uint8_t *key, int key_bits);
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/**
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* Encrypt or decrypt a buffer using a previously initialized context
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* Encrypt or decrypt a buffer using a previously initialized context, ECB mode only
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*
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* @param ctx an AVCAST5 context
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* @param dst destination array, can be equal to src
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@ -61,6 +61,18 @@ int av_cast5_init(struct AVCAST5 *ctx, const uint8_t *key, int key_bits);
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* @param decrypt 0 for encryption, 1 for decryption
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*/
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void av_cast5_crypt(struct AVCAST5 *ctx, uint8_t *dst, const uint8_t *src, int count, int decrypt);
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/**
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* Encrypt or decrypt a buffer using a previously initialized context
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*
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* @param ctx an AVCAST5 context
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* @param dst destination array, can be equal to src
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* @param src source array, can be equal to dst
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* @param count number of 8 byte blocks
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* @param iv initialization vector for CBC mode, NULL for ECB mode
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* @param decrypt 0 for encryption, 1 for decryption
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*/
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void av_cast5_crypt2(struct AVCAST5 *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
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/**
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* @}
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*/
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