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ca7f8e2b86
PX_OWN_ALLOC was intended as a way to disable the use of palloc(), and
over the time new palloc() or equivalent calls have been added like in
32984d8, making this extra layer losing its original purpose. This
simplifies on the way some code paths to use palloc0() rather than
palloc() followed by memset(0).
Author: Daniel Gustafsson
Discussion: https://postgr.es/m/A5BFAA1A-B2E8-4CBC-895E-7B1B9475A527@yesql.se
143 lines
3.1 KiB
C
143 lines
3.1 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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* contrib/pgcrypto/pgp-mpi.c
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*/
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#include "postgres.h"
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#include "pgp.h"
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#include "px.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 = palloc(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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px_memset(mpi, 0, sizeof(*mpi) + mpi->bytes);
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pfree(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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