MODULE = CryptX PACKAGE = Crypt::Mode::CBC
PROTOTYPES: DISABLE
### BEWARE - GENERATED FILE, DO NOT EDIT MANUALLY!
Crypt::Mode::CBC
new(Class, 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) {
Safefree(RETVAL);
croak("FATAL: find_cipfer failed for '%s'", cipher_name);
}
}
OUTPUT:
RETVAL
void
DESTROY(Crypt::Mode::CBC self)
CODE:
Safefree(self);
void
start_decrypt(Crypt::Mode::CBC self, SV * key, SV * iv)
ALIAS:
start_encrypt = 1
PPCODE:
{
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 = ix == 1 ? 1 : -1;
self->padlen = 0;
XPUSHs(ST(0)); /* return self */
}
SV *
add(Crypt::Mode::CBC self, ...)
CODE:
{
int rv, has_tmp_block, blen, j;
unsigned long i;
STRLEN in_data_len, in_data_start, out_len = 0;
unsigned char *in_data, *out_data, tmp_block[MAXBLOCKSIZE];
RETVAL = newSVpvn("", 0);
for (j = 1; j < items; j++) {
in_data = (unsigned char *)SvPVbyte(ST(j), in_data_len);
blen = (&self->state)->blocklen;
in_data_start = 0;
has_tmp_block = 0;
if (in_data_len > 0) {
if (self->direction == 1) {
/* handle non-empty self->pad buffer */
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) {
SvREFCNT_dec(RETVAL);
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;
}
}
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);
out_data = (unsigned char*)SvGROW(RETVAL, out_len + i + 1) + out_len;
out_len += i;
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) {
SvREFCNT_dec(RETVAL);
croak("FATAL: cbc_encrypt failed: %s", error_to_string(rv));
}
} /* in_data_len > 0 */
else if (has_tmp_block) {
out_data = (unsigned char*)SvGROW(RETVAL, out_len + blen + 1) + out_len;
out_len += blen;
Copy(tmp_block, out_data, blen, unsigned char);
}
}
else if (self->direction == -1) {
if (self->padlen == blen) {
rv = cbc_decrypt(self->pad, tmp_block, blen, &self->state);
if (rv != CRYPT_OK) {
SvREFCNT_dec(RETVAL);
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) {
SvREFCNT_dec(RETVAL);
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) {
out_data = (unsigned char*)SvGROW(RETVAL, out_len + i + 1) + out_len;
out_len += i;
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) {
SvREFCNT_dec(RETVAL);
croak("FATAL: cbc_decrypt failed: %s", error_to_string(rv));
}
}
} /* in_data_len>0 */
else if (has_tmp_block) {
out_data = (unsigned char*)SvGROW(RETVAL, out_len + blen + 1) + out_len;
out_len += blen;
Copy(tmp_block, out_data, blen, unsigned char);
}
}
else {
SvREFCNT_dec(RETVAL);
croak("FATAL: call start_decryt or start_encrpyt first (%d)", self->direction);
}
}
}
if (out_len > 0) SvCUR_set(RETVAL, out_len);
}
OUTPUT:
RETVAL
SV *
finish(Crypt::Mode::CBC self)
CODE:
{
unsigned char tmp_block[MAXBLOCKSIZE];
int rv;
unsigned long blen = (&self->state)->blocklen;
unsigned long padmode;
if (self->direction == 1) {
if (self->padlen < 0 || self->padlen >= (int)blen) croak("FATAL: invalid padlen");
if (self->padding_mode != 0) {
if (self->padding_mode == 1) { padmode = LTC_PAD_PKCS7 | (&self->state)->blocklen; }
else if (self->padding_mode == 2) { padmode = LTC_PAD_ONE_AND_ZERO | (&self->state)->blocklen; }
else if (self->padding_mode == 3) { padmode = LTC_PAD_ANSI_X923 | (&self->state)->blocklen; }
else if (self->padding_mode == 4) { padmode = LTC_PAD_ZERO | (&self->state)->blocklen; }
else if (self->padding_mode == 5) { padmode = LTC_PAD_ZERO_ALWAYS | (&self->state)->blocklen; }
else { croak("FATAL: unknown padding"); }
blen = sizeof(self->pad);
rv = padding_pad(self->pad, self->padlen, &blen, padmode);
if (rv != CRYPT_OK) croak("FATAL: padding_pad failed: %s", error_to_string(rv));
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", (int)blen);
blen = 0;
}
}
else if (self->direction == -1) {
if (self->padlen > 0) {
if (self->padlen != (int)blen) croak("FATAL: cipher text length has to be multiple of %d (%d)", (int)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) {
if (self->padding_mode == 1) { padmode = LTC_PAD_PKCS7 | (&self->state)->blocklen; }
else if (self->padding_mode == 2) { padmode = LTC_PAD_ONE_AND_ZERO | (&self->state)->blocklen; }
else if (self->padding_mode == 3) { padmode = LTC_PAD_ANSI_X923 | (&self->state)->blocklen; }
else if (self->padding_mode == 4) { padmode = LTC_PAD_ZERO | (&self->state)->blocklen; }
else if (self->padding_mode == 5) { padmode = LTC_PAD_ZERO_ALWAYS | (&self->state)->blocklen; }
else { croak("FATAL: unknown padding"); }
rv = padding_depad(tmp_block, &blen, padmode);
if (rv != CRYPT_OK) croak("FATAL: padding_depad failed: %s", error_to_string(rv));
}
else {
/* "no padding" == there is no need to do anything */
}
}
else {
blen = 0;
}
}
else {
croak("FATAL: invalid direction");
}
self->direction = 0;
RETVAL = newSVpvn((char*)tmp_block, blen);
}
OUTPUT:
RETVAL