268 lines
10 KiB
C++
268 lines
10 KiB
C++
MODULE = CryptX PACKAGE = Crypt::Mode::CBC
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PROTOTYPES: DISABLE
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### BEWARE - GENERATED FILE, DO NOT EDIT MANUALLY!
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Crypt::Mode::CBC
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new(Class, char * cipher_name, int padding=1, int rounds=0)
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CODE:
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{
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Newz(0, RETVAL, 1, struct cbc_struct);
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if (!RETVAL) croak("FATAL: Newz failed");
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RETVAL->padding_mode = padding;
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RETVAL->padlen = 0;
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RETVAL->direction = 0;
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RETVAL->cipher_rounds = rounds;
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RETVAL->cipher_id = _find_cipher(cipher_name);
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if (RETVAL->cipher_id == -1) {
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Safefree(RETVAL);
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croak("FATAL: find_cipfer failed for '%s'", cipher_name);
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}
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}
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OUTPUT:
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RETVAL
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void
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DESTROY(Crypt::Mode::CBC self)
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CODE:
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Safefree(self);
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void
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start_decrypt(Crypt::Mode::CBC self, SV * key, SV * iv)
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ALIAS:
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start_encrypt = 1
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PPCODE:
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{
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int rv;
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STRLEN k_len=0;
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unsigned char *k=NULL;
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STRLEN i_len=0;
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unsigned char *i=NULL;
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if (!SvPOK(key)) croak("FATAL: key must be string/buffer scalar");
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k = (unsigned char *) SvPVbyte(key, k_len);
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if (!SvPOK(iv)) croak("FATAL: iv must be string/buffer scalar");
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i = (unsigned char *) SvPVbyte(iv, i_len);
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if (i_len != (STRLEN)cipher_descriptor[self->cipher_id].block_length) {
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croak ("FATAL: sizeof(iv) should be equal to blocksize (%d)", cipher_descriptor[self->cipher_id].block_length);
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}
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rv = cbc_start(self->cipher_id, i, k, (unsigned long)k_len, self->cipher_rounds, &self->state);
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if (rv != CRYPT_OK) {
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croak("FATAL: cbc_start failed: %s", error_to_string(rv));
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}
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self->direction = ix == 1 ? 1 : -1;
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self->padlen = 0;
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XPUSHs(ST(0)); /* return self */
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}
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SV *
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add(Crypt::Mode::CBC self, ...)
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CODE:
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{
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int rv, has_tmp_block, blen, j;
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unsigned long i;
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STRLEN in_data_len, in_data_start, out_len = 0;
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unsigned char *in_data, *out_data, tmp_block[MAXBLOCKSIZE];
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RETVAL = newSVpvn("", 0);
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for (j = 1; j < items; j++) {
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in_data = (unsigned char *)SvPVbyte(ST(j), in_data_len);
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blen = (&self->state)->blocklen;
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in_data_start = 0;
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has_tmp_block = 0;
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if (in_data_len > 0) {
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if (self->direction == 1) {
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/* handle non-empty self->pad buffer */
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if (self->padlen > 0) {
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i = (blen - self->padlen);
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if (in_data_len >= i) { /* enough data to fill pad */
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Copy(in_data, self->pad+self->padlen, i, unsigned char);
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in_data_len -= i;
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in_data_start = i;
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rv = cbc_encrypt(self->pad, tmp_block, blen, &self->state);
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if (rv != CRYPT_OK) {
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SvREFCNT_dec(RETVAL);
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croak("FATAL: cbc_encrypt failed: %s", error_to_string(rv));
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}
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self->padlen = 0;
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has_tmp_block = 1;
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}
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else { /* not enough data to fill pad */
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Copy(in_data, self->pad+self->padlen, in_data_len, unsigned char);
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self->padlen += (int)in_data_len;
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in_data_len = 0;
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}
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}
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i = (unsigned long)(in_data_len % blen);
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if (in_data_len > 0 && i > 0) { /* save tail of data into pad */
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Copy(in_data + in_data_start + in_data_len - i, self->pad, i, unsigned char);
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self->padlen = i;
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in_data_len -= i;
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}
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if (in_data_len > 0) {
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i = (unsigned long)(has_tmp_block ? in_data_len + blen : in_data_len);
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out_data = (unsigned char*)SvGROW(RETVAL, out_len + i + 1) + out_len;
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out_len += i;
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if (has_tmp_block) {
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Copy(tmp_block, out_data, blen, unsigned char);
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out_data += blen;
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}
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rv = cbc_encrypt(in_data+in_data_start, out_data, (unsigned long)in_data_len, &self->state);
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if (rv != CRYPT_OK) {
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SvREFCNT_dec(RETVAL);
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croak("FATAL: cbc_encrypt failed: %s", error_to_string(rv));
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}
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} /* in_data_len > 0 */
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else if (has_tmp_block) {
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out_data = (unsigned char*)SvGROW(RETVAL, out_len + blen + 1) + out_len;
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out_len += blen;
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Copy(tmp_block, out_data, blen, unsigned char);
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}
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}
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else if (self->direction == -1) {
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if (self->padlen == blen) {
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rv = cbc_decrypt(self->pad, tmp_block, blen, &self->state);
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if (rv != CRYPT_OK) {
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SvREFCNT_dec(RETVAL);
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croak("FATAL: cbc_decrypt failed: %s", error_to_string(rv));
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}
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self->padlen = 0;
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has_tmp_block = 1;
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} /* padlen == blen */
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else if (self->padlen > 0) {
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i = (blen - self->padlen); /* remaining bytes in padding buffer */
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if (in_data_len >= i) { /* enough data to fill pad */
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Copy(in_data, self->pad+self->padlen, i, unsigned char);
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self->padlen += i;
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in_data_len -= i;
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in_data_start = i;
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if (in_data_len>0 || self->padding_mode == 0) {
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rv = cbc_decrypt(self->pad, tmp_block, blen, &self->state);
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if (rv != CRYPT_OK) {
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SvREFCNT_dec(RETVAL);
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croak("FATAL: cbc_decrypt failed: %s", error_to_string(rv));
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}
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self->padlen = 0;
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has_tmp_block = 1;
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}
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}
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else { /* not enough data to fill pad */
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Copy(in_data, self->pad+self->padlen, in_data_len, unsigned char);
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self->padlen += (int)in_data_len;
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in_data_len = 0;
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}
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} /* padlen > 0 */
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/* here: a/ padlen == 1..16 && in_data_len == 0; b/ padlen == 0 && in_data_len > 0 */
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if (in_data_len>0) {
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i = (unsigned long)(in_data_len % blen);
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if (i>0) { /* save tail of data into pad */
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Copy(in_data+in_data_start+in_data_len-i, self->pad, i, unsigned char);
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self->padlen = i;
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in_data_len -= i;
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}
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}
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if (in_data_len>0) {
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if (self->padlen == 0 && self->padding_mode !=0) {
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/* in case of padding keep full pad if no more data */
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Copy(in_data+in_data_start+in_data_len-blen, self->pad, blen, unsigned char);
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self->padlen = blen;
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in_data_len -= blen;
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}
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i = (unsigned long)(has_tmp_block ? in_data_len + blen : in_data_len);
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if (i > 0) {
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out_data = (unsigned char*)SvGROW(RETVAL, out_len + i + 1) + out_len;
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out_len += i;
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if (has_tmp_block) {
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Copy(tmp_block, out_data, blen, unsigned char);
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out_data += blen;
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}
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rv = cbc_decrypt(in_data+in_data_start, out_data, (unsigned long)in_data_len, &self->state);
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if (rv != CRYPT_OK) {
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SvREFCNT_dec(RETVAL);
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croak("FATAL: cbc_decrypt failed: %s", error_to_string(rv));
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}
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}
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} /* in_data_len>0 */
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else if (has_tmp_block) {
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out_data = (unsigned char*)SvGROW(RETVAL, out_len + blen + 1) + out_len;
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out_len += blen;
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Copy(tmp_block, out_data, blen, unsigned char);
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}
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}
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else {
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SvREFCNT_dec(RETVAL);
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croak("FATAL: call start_decryt or start_encrpyt first (%d)", self->direction);
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}
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}
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}
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if (out_len > 0) SvCUR_set(RETVAL, out_len);
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}
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OUTPUT:
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RETVAL
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SV *
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finish(Crypt::Mode::CBC self)
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CODE:
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{
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unsigned char tmp_block[MAXBLOCKSIZE], ch;
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int i, j, rv, blen = (&self->state)->blocklen;
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if (self->direction == 1) {
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if (self->padlen<0 || self->padlen>=blen) croak("FATAL: invalid padlen");
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if (self->padding_mode == 1) { /* pkcs5|7 padding */
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i = blen - self->padlen;
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if (i == 0) i = blen;
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for(j=self->padlen; j<blen; j++) self->pad[j] = (unsigned char)i;
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rv = cbc_encrypt(self->pad, tmp_block, blen, &self->state);
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if (rv != CRYPT_OK) croak("FATAL: cbc_encrypt failed: %s", error_to_string(rv));
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}
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else if (self->padding_mode == 2) { /* oneandzeroes padding */
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self->pad[self->padlen] = 0x80;
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for(j=self->padlen+1; j<blen; j++) self->pad[j] = 0;
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rv = cbc_encrypt(self->pad, tmp_block, blen, &self->state);
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if (rv != CRYPT_OK) croak("FATAL: cbc_encrypt failed: %s", error_to_string(rv));
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}
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else {
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if (self->padlen>0) croak("FATAL: cbc_encrypt, input data length not multiple of %d", blen);
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blen = 0;
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}
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}
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else if (self->direction == -1) {
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if (self->padlen > 0) {
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if (self->padlen != blen) croak("FATAL: cipher text length has to be multiple of %d (%d)", blen, self->padlen);
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rv = cbc_decrypt(self->pad, tmp_block, blen, &self->state);
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if (rv != CRYPT_OK) croak("FATAL: cbc_decrypt failed: %s", error_to_string(rv));
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if (self->padding_mode == 0) { /* no padding */
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/* we already have blen */
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}
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else if (self->padding_mode == 1) { /* pkcs5|7 padding */
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ch = tmp_block[blen-1];
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blen = blen - (ch > blen ? blen : ch);
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}
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else if (self->padding_mode == 2) { /* oneandzeroes padding */
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while ((unsigned char)tmp_block[blen - 1] == 0x00) blen--;
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if ((unsigned char)tmp_block[blen - 1] == 0x80) blen--;
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if (blen < 0) blen = 0;
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}
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}
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else {
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blen = 0;
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}
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}
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else {
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XSRETURN_UNDEF;
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}
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self->direction = 0;
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RETVAL = newSVpvn((char*)tmp_block, blen);
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}
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OUTPUT:
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RETVAL
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