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144 lines
3.2 KiB
C
144 lines
3.2 KiB
C
/*
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* pgp-mpi.c
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* OpenPGP MPI helper functions.
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*
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* Copyright (c) 2005 Marko Kreen
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $PostgreSQL: pgsql/contrib/pgcrypto/pgp-mpi.c,v 1.5 2009/06/11 14:48:52 momjian Exp $
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*/
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#include "postgres.h"
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#include "px.h"
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#include "mbuf.h"
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#include "pgp.h"
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int
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pgp_mpi_alloc(int bits, PGP_MPI **mpi)
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{
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PGP_MPI *n;
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int len = (bits + 7) / 8;
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if (bits < 0 || bits > 0xFFFF)
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{
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px_debug("pgp_mpi_alloc: unreasonable request: bits=%d", bits);
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return PXE_PGP_CORRUPT_DATA;
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}
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n = px_alloc(sizeof(*n) + len);
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n->bits = bits;
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n->bytes = len;
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n->data = (uint8 *) (n) + sizeof(*n);
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*mpi = n;
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return 0;
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}
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int
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pgp_mpi_create(uint8 *data, int bits, PGP_MPI **mpi)
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{
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int res;
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PGP_MPI *n;
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res = pgp_mpi_alloc(bits, &n);
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if (res < 0)
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return res;
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memcpy(n->data, data, n->bytes);
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*mpi = n;
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return 0;
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}
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int
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pgp_mpi_free(PGP_MPI *mpi)
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{
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if (mpi == NULL)
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return 0;
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memset(mpi, 0, sizeof(*mpi) + mpi->bytes);
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px_free(mpi);
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return 0;
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}
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int
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pgp_mpi_read(PullFilter *src, PGP_MPI **mpi)
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{
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int res;
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uint8 hdr[2];
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int bits;
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PGP_MPI *n;
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res = pullf_read_fixed(src, 2, hdr);
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if (res < 0)
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return res;
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bits = ((unsigned) hdr[0] << 8) + hdr[1];
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res = pgp_mpi_alloc(bits, &n);
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if (res < 0)
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return res;
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res = pullf_read_fixed(src, n->bytes, n->data);
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if (res < 0)
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pgp_mpi_free(n);
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else
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*mpi = n;
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return res;
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}
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int
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pgp_mpi_write(PushFilter *dst, PGP_MPI *n)
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{
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int res;
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uint8 buf[2];
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buf[0] = n->bits >> 8;
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buf[1] = n->bits & 0xFF;
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res = pushf_write(dst, buf, 2);
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if (res >= 0)
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res = pushf_write(dst, n->data, n->bytes);
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return res;
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}
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int
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pgp_mpi_hash(PX_MD *md, PGP_MPI *n)
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{
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uint8 buf[2];
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buf[0] = n->bits >> 8;
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buf[1] = n->bits & 0xFF;
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px_md_update(md, buf, 2);
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px_md_update(md, n->data, n->bytes);
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return 0;
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}
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unsigned
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pgp_mpi_cksum(unsigned cksum, PGP_MPI *n)
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{
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int i;
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cksum += n->bits >> 8;
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cksum += n->bits & 0xFF;
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for (i = 0; i < n->bytes; i++)
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cksum += n->data[i];
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return cksum & 0xFFFF;
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}
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