47 int ocb_init(ocb_state *ocb, int cipher,   in ocb_init()  argument
52    LTC_ARGCHK(ocb   != NULL);  in ocb_init()
62    ocb->block_len = cipher_descriptor[cipher].block_length;  in ocb_init()
64        if (polys[poly].len == ocb->block_len) {   in ocb_init()
68    if (polys[poly].len != ocb->block_len) {  in ocb_init()
73    if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &ocb->key)) != CRYPT_OK) {  in ocb_init()
78    zeromem(ocb->L, ocb->block_len);  in ocb_init()
79    if ((err = cipher_descriptor[cipher].ecb_encrypt(ocb->L, ocb->L, &ocb->key)) != CRYPT_OK) {  in ocb_init()
84    for (x = 0; x < ocb->block_len; x++) {  in ocb_init()
85        ocb->R[x] = ocb->L[x] ^ nonce[x];  in ocb_init()
87    if ((err = cipher_descriptor[cipher].ecb_encrypt(ocb->R, ocb->R, &ocb->key)) != CRYPT_OK) {  in ocb_init()
92    XMEMCPY(ocb->Ls[0], ocb->L, ocb->block_len);  in ocb_init()
94        m = ocb->Ls[x-1][0] >> 7;  in ocb_init()
95        for (y = 0; y < ocb->block_len-1; y++) {  in ocb_init()
96            ocb->Ls[x][y] = ((ocb->Ls[x-1][y] << 1) | (ocb->Ls[x-1][y+1] >> 7)) & 255;  in ocb_init()
98        ocb->Ls[x][ocb->block_len-1] = (ocb->Ls[x-1][ocb->block_len-1] << 1) & 255;  in ocb_init()
101           for (y = 0; y < ocb->block_len; y++) {  in ocb_init()
102               ocb->Ls[x][y] ^= polys[poly].poly_mul[y];  in ocb_init()
108     m = ocb->L[ocb->block_len-1] & 1;  in ocb_init()
111     for (x = ocb->block_len - 1; x > 0; x--) {  in ocb_init()
112         ocb->Lr[x] = ((ocb->L[x] >> 1) | (ocb->L[x-1] << 7)) & 255;  in ocb_init()
114     ocb->Lr[0] = ocb->L[0] >> 1;  in ocb_init()
117        for (x = 0; x < ocb->block_len; x++) {  in ocb_init()
118            ocb->Lr[x] ^= polys[poly].poly_div[x];  in ocb_init()
123     zeromem(ocb->Li,       ocb->block_len);  in ocb_init()
124     zeromem(ocb->checksum, ocb->block_len);  in ocb_init()
127     ocb->block_index = 1;  in ocb_init()
128     ocb->cipher      = cipher;  in ocb_init()