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inc/CryptX_Mode_CBC.xs.inc  view on Meta::CPAN

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 = cryptx_internal_find_cipher(cipher_name);
        if (RETVAL->cipher_id == -1) {
          Safefree(RETVAL);
          croak("FATAL: find_cipher failed for '%s'", cipher_name);
        }
    }
    OUTPUT:
        RETVAL

void
DESTROY(Crypt::Mode::CBC self)
    CODE:
    {
        zeromem(&self->state, sizeof(symmetric_CBC));
        zeromem(self->pad, sizeof(self->pad));
        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_spec(key))   croak("FATAL: key must be string/buffer scalar");
        k = (unsigned char *) SvPVbyte(key, k_len);

        if (!SvPOK_spec(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, (int)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)->ecb.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;