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libcryptx-perl/inc/CryptX_Mode_CBC.xs.inc

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MODULE = CryptX PACKAGE = Crypt::Mode::CBC
### BEWARE - GENERATED FILE, DO NOT EDIT MANUALLY!
Crypt::Mode::CBC
_new(char * cipher_name, int padding=1, int rounds=0)
CODE:
{
Newz(0, RETVAL, 1, struct cbc_struct);
if (!RETVAL) croak("FATAL: Newz failed");
RETVAL->padding_mode = padding;
RETVAL->padlen = 0;
RETVAL->direction = 0;
RETVAL->cipher_rounds = rounds;
RETVAL->cipher_id = find_cipher(cipher_name);
if(RETVAL->cipher_id==-1) croak("FATAL: find_cipfer failed for '%s'", cipher_name);
}
OUTPUT:
RETVAL
void
DESTROY(Crypt::Mode::CBC self)
CODE:
Safefree(self);
int
_get_dir(Crypt::Mode::CBC self)
CODE:
RETVAL = self->direction;
OUTPUT:
RETVAL
void
_start(Crypt::Mode::CBC self, int dir, SV * key, SV * iv)
CODE:
{
int rv;
STRLEN k_len=0;
unsigned char *k=NULL;
STRLEN i_len=0;
unsigned char *i=NULL;
if (!SvPOK(key)) croak("FATAL: key must be string/buffer scalar");
k = (unsigned char *) SvPVbyte(key, k_len);
if (!SvPOK(iv)) croak("FATAL: iv must be string/buffer scalar");
i = (unsigned char *) SvPVbyte(iv, i_len);
if (i_len != (STRLEN)cipher_descriptor[self->cipher_id].block_length) {
croak ("FATAL: sizeof(iv) should be equal to blocksize (%d)", cipher_descriptor[self->cipher_id].block_length);
}
rv = cbc_start(self->cipher_id, i, k, (unsigned long)k_len, self->cipher_rounds, &self->state);
if (rv != CRYPT_OK) {
croak("FATAL: cbc_start failed: %s", error_to_string(rv));
}
self->direction = dir;
self->padlen = 0;
}
SV *
_encrypt(Crypt::Mode::CBC self, SV * data)
CODE:
{
int rv, has_tmp_block, blen;
unsigned long i;
STRLEN in_data_len, in_data_start;
unsigned char *in_data, *out_data, tmp_block[MAXBLOCKSIZE];
if (self->direction != 1) croak("FATAL: encrypt error, call start_encrypt first (%d)", self->direction);
blen = (&self->state)->blocklen;
in_data_start = 0;
has_tmp_block = 0;
in_data = (unsigned char *)SvPVbyte(data, in_data_len);
if (in_data_len==0) {
RETVAL = newSVpvn("", 0);
}
else {
if(self->padlen > 0) {
i = (blen - self->padlen);
if (in_data_len >= i) { /* enough data to fill pad */
Copy(in_data, self->pad+self->padlen, i, unsigned char);
in_data_len -= i;
in_data_start = i;
rv = cbc_encrypt(self->pad, tmp_block, blen, &self->state);
if (rv != CRYPT_OK) croak("FATAL: cbc_encrypt failed: %s", error_to_string(rv));
self->padlen = 0;
has_tmp_block = 1;
}
else { /* not enough data to fill pad */
Copy(in_data, self->pad+self->padlen, in_data_len, unsigned char);
self->padlen += (int)in_data_len;
in_data_len = 0;
}
} /* padlen > 0 */
i = (unsigned long)(in_data_len % blen);
if (in_data_len>0 && i>0) { /* save tail of data into pad */
Copy(in_data+in_data_start+in_data_len-i, self->pad, i, unsigned char);
self->padlen = i;
in_data_len -= i;
}
if (in_data_len>0) {
i = (unsigned long)(has_tmp_block ? in_data_len + blen : in_data_len);
RETVAL = NEWSV(0, i);
SvPOK_only(RETVAL);
SvCUR_set(RETVAL, i);
out_data = (unsigned char *)SvPV_nolen(RETVAL);
if (has_tmp_block) {
Copy(tmp_block, out_data, blen, unsigned char);
out_data += blen;
}
rv = cbc_encrypt(in_data+in_data_start, out_data, (unsigned long)in_data_len, &self->state);
if (rv != CRYPT_OK) croak("FATAL: cbc_encrypt failed: %s", error_to_string(rv));
} /* in_data_len>0 */
else if (has_tmp_block) {
RETVAL = newSVpvn((char*)tmp_block, blen);
}
else {
RETVAL = newSVpvn("", 0);
}
}
}
OUTPUT:
RETVAL
SV *
_finish_enc(Crypt::Mode::CBC self)
CODE:
{
unsigned char tmp_block[MAXBLOCKSIZE];
int rv, blen, i, j;
blen = (&self->state)->blocklen;
if (self->padlen<0 || self->padlen>=blen) croak("FATAL: invalid padlen");
if(self->padding_mode == 1) { /* pkcs5|7 padding */
i = blen - self->padlen;
if (i == 0) i = blen;
for(j=self->padlen; j<blen; j++) self->pad[j] = (unsigned char)i;
rv = cbc_encrypt(self->pad, tmp_block, blen, &self->state);
if (rv != CRYPT_OK) croak("FATAL: cbc_encrypt failed: %s", error_to_string(rv));
}
else if(self->padding_mode == 2) { /* oneandzeroes padding */
self->pad[self->padlen] = 0x80;
for(j=self->padlen+1; j<blen; j++) self->pad[j] = 0;
rv = cbc_encrypt(self->pad, tmp_block, blen, &self->state);
if (rv != CRYPT_OK) croak("FATAL: cbc_encrypt failed: %s", error_to_string(rv));
}
else {
if (self->padlen>0) croak("FATAL: cbc_encrypt, input data length not multiple of %d", blen);
blen = 0;
}
self->direction = 0;
RETVAL = newSVpvn((char*)tmp_block, blen);
}
OUTPUT:
RETVAL
SV *
_decrypt(Crypt::Mode::CBC self, SV * data)
CODE:
{
int rv, has_tmp_block, blen;
unsigned long i;
STRLEN in_data_len, in_data_start;
unsigned char *in_data, *out_data, tmp_block[MAXBLOCKSIZE];
if (self->direction != -1) croak("FATAL: decrypt error, call start_decryt first (%d)", self->direction);
blen = (&self->state)->blocklen;
in_data_start = 0;
has_tmp_block = 0;
in_data = (unsigned char *)SvPVbyte(data, in_data_len);
if (in_data_len==0) {
RETVAL = newSVpvn("", 0);
}
else {
if(self->padlen == blen) {
rv = cbc_decrypt(self->pad, tmp_block, blen, &self->state);
if (rv != CRYPT_OK) croak("FATAL: cbc_decrypt failed: %s", error_to_string(rv));
self->padlen = 0;
has_tmp_block = 1;
} /* padlen == blen */
else if(self->padlen > 0) {
i = (blen - self->padlen); /* remaining bytes in padding buffer */
if (in_data_len >= i) { /* enough data to fill pad */
Copy(in_data, self->pad+self->padlen, i, unsigned char);
self->padlen += i;
in_data_len -= i;
in_data_start = i;
if (in_data_len>0 || self->padding_mode == 0) {
rv = cbc_decrypt(self->pad, tmp_block, blen, &self->state);
if (rv != CRYPT_OK) croak("FATAL: cbc_decrypt failed: %s", error_to_string(rv));
self->padlen = 0;
has_tmp_block = 1;
}
}
else { /* not enough data to fill pad */
Copy(in_data, self->pad+self->padlen, in_data_len, unsigned char);
self->padlen += (int)in_data_len;
in_data_len = 0;
}
} /* padlen > 0 */
/* here: a/ padlen==1..16 && in_data_len==0; b/ padlen==0 && in_data_len>0 */
if (in_data_len>0) {
i = (unsigned long)(in_data_len % blen);
if (i>0) { /* save tail of data into pad */
Copy(in_data+in_data_start+in_data_len-i, self->pad, i, unsigned char);
self->padlen = i;
in_data_len -= i;
}
}
if (in_data_len>0) {
if(self->padlen == 0 && self->padding_mode !=0) {
/* in case of padding keep full pad if no more data */
Copy(in_data+in_data_start+in_data_len-blen, self->pad, blen, unsigned char);
self->padlen = blen;
in_data_len -= blen;
}
i = (unsigned long)(has_tmp_block ? in_data_len + blen : in_data_len);
if (i == 0) {
RETVAL = newSVpvn("", 0);
}
else {
RETVAL = NEWSV(0, i);
SvPOK_only(RETVAL);
SvCUR_set(RETVAL, i);
out_data = (unsigned char *)SvPV_nolen(RETVAL);
if (has_tmp_block) {
Copy(tmp_block, out_data, blen, unsigned char);
out_data += blen;
}
rv = cbc_decrypt(in_data+in_data_start, out_data, (unsigned long)in_data_len, &self->state);
if (rv != CRYPT_OK) croak("FATAL: cbc_decrypt failed: %s", error_to_string(rv));
}
} /* in_data_len>0 */
else if (has_tmp_block) {
RETVAL = newSVpvn((char*)tmp_block, blen);
}
else {
RETVAL = newSVpvn("", 0);
}
}
}
OUTPUT:
RETVAL
SV *
_finish_dec(Crypt::Mode::CBC self)
CODE:
{
unsigned char tmp_block[MAXBLOCKSIZE];
unsigned char i;
int rv, rv_len, blen;
rv_len = 0;
if (self->padlen > 0) {
blen = (&self->state)->blocklen;
if (self->padlen != blen) croak("FATAL: cipher text length has to be multiple of %d (%d)", blen, self->padlen);
rv = cbc_decrypt(self->pad, tmp_block, blen, &self->state);
if (rv != CRYPT_OK) croak("FATAL: cbc_decrypt failed: %s", error_to_string(rv));
if(self->padding_mode == 0) { /* no padding */
rv_len = blen;
}
else if(self->padding_mode == 1) { /* pkcs5|7 padding */
i = tmp_block[blen-1];
rv_len = blen - (i>blen ? blen : i);
}
else if(self->padding_mode == 2) { /* oneandzeroes padding */
rv_len = blen;
while ((unsigned char)tmp_block[rv_len-1] == 0x00) rv_len--;
if ((unsigned char)tmp_block[rv_len-1] == 0x80) rv_len--;
if (rv_len<0) rv_len = 0;
}
}
self->direction = 0;
RETVAL = newSVpvn((char*)tmp_block, rv_len);
}
OUTPUT:
RETVAL
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