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the pubkey functions a bit. The actual RSA-specific code there is tiny, most of the patch consists of reorg of the pubkey code, as lots of it was written as elgamal-only. --------------------------------------------------------------------------- The SHLIB section was copy-pasted from somewhere and contains several unnecessary libs. This cleans it up a bit. -lcrypt we don't use system crypt() -lssl, -lssleay32 no SSL here -lz in win32 section already added on previous line -ldes The chance anybody has it is pretty low. And the chance pgcrypto works with it is even lower. Also trim the win32 section. --------------------------------------------------------------------------- It is already disabled in Makefile, remove code too. --------------------------------------------------------------------------- I was bit hasty making the random exponent 'k' a prime. Further researh shows that Elgamal encryption has no specific needs in respect to k, any random number is fine. It is bit different for signing, there it needs to be 'relatively prime' to p - 1, that means GCD(k, p-1) == 1, which is also a lot lighter than full primality. As we don't do signing, this can be ignored. This brings major speedup to Elgamal encryption. --------------------------------------------------------------------------- o pgp_mpi_free: Accept NULLs o pgp_mpi_cksum: result should be 16bit o Remove function name from error messages - to be similar to other SQL functions, and it does not match anyway the called function o remove couple junk lines --------------------------------------------------------------------------- o Support for RSA encryption o Big reorg to better separate generic and algorithm-specific code. o Regression tests for RSA. --------------------------------------------------------------------------- o Tom stuck a CVS id into file. I doubt the usefulness of it, but if it needs to be in the file then rather at the end. Also tag it as comment for asciidoc. o Mention bytea vs. text difference o Couple clarifications --------------------------------------------------------------------------- There is a choice whether to update it with pgp functions or remove it. I decided to remove it, updating is pointless. I've tried to keep the core of pgcrypto relatively independent from main PostgreSQL, to make it easy to use externally if needed, and that is good. Eg. that made development of PGP functions much nicer. But I have no plans to release it as generic library, so keeping such doc up-to-date is waste of time. If anyone is interested in using it in other products, he can probably bother to read the source too. Commented source is another thing - I'll try to make another pass over code to see if there is anything non-obvious that would need more comments. --------------------------------------------------------------------------- Marko Kreen
137 lines
3.2 KiB
C
137 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 1.3 2005/08/13 02:06:20 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 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 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 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 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 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 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 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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