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pgp-mpi.c

/*
 * pgp-mpi.c
 *      OpenPGP MPI helper functions.
 *
 * Copyright (c) 2005 Marko Kreen
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.      IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $PostgreSQL$
 */
#include "postgres.h"

#include "px.h"
#include "mbuf.h"
#include "pgp.h"

int
pgp_mpi_alloc(int bits, PGP_MPI ** mpi)
{
      PGP_MPI    *n;
      int               len = (bits + 7) / 8;

      if (bits < 0 || bits > 0xFFFF)
      {
            px_debug("pgp_mpi_alloc: unreasonable request: bits=%d", bits);
            return PXE_PGP_CORRUPT_DATA;
      }
      n = px_alloc(sizeof(*n) + len);
      n->bits = bits;
      n->bytes = len;
      n->data = (uint8 *) (n) + sizeof(*n);
      *mpi = n;
      return 0;
}

int
pgp_mpi_create(uint8 *data, int bits, PGP_MPI ** mpi)
{
      int               res;
      PGP_MPI    *n;

      res = pgp_mpi_alloc(bits, &n);
      if (res < 0)
            return res;
      memcpy(n->data, data, n->bytes);
      *mpi = n;
      return 0;
}

int
pgp_mpi_free(PGP_MPI * mpi)
{
      if (mpi == NULL)
            return 0;
      memset(mpi, 0, sizeof(*mpi) + mpi->bytes);
      px_free(mpi);
      return 0;
}

int
pgp_mpi_read(PullFilter * src, PGP_MPI ** mpi)
{
      int               res;
      uint8       hdr[2];
      int               bits;
      PGP_MPI    *n;

      res = pullf_read_fixed(src, 2, hdr);
      if (res < 0)
            return res;
      bits = ((unsigned) hdr[0] << 8) + hdr[1];

      res = pgp_mpi_alloc(bits, &n);
      if (res < 0)
            return res;

      res = pullf_read_fixed(src, n->bytes, n->data);
      if (res < 0)
            pgp_mpi_free(n);
      else
            *mpi = n;
      return res;
}

int
pgp_mpi_write(PushFilter * dst, PGP_MPI * n)
{
      int               res;
      uint8       buf[2];

      buf[0] = n->bits >> 8;
      buf[1] = n->bits & 0xFF;
      res = pushf_write(dst, buf, 2);
      if (res >= 0)
            res = pushf_write(dst, n->data, n->bytes);
      return res;
}

int
pgp_mpi_hash(PX_MD * md, PGP_MPI * n)
{
      uint8       buf[2];

      buf[0] = n->bits >> 8;
      buf[1] = n->bits & 0xFF;
      px_md_update(md, buf, 2);
      px_md_update(md, n->data, n->bytes);

      return 0;
}

unsigned
pgp_mpi_cksum(unsigned cksum, PGP_MPI * n)
{
      int               i;

      cksum += n->bits >> 8;
      cksum += n->bits & 0xFF;
      for (i = 0; i < n->bytes; i++)
            cksum += n->data[i];

      return cksum & 0xFFFF;
}

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