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pgp.h used to require including mbuf.h and px.h first. Include those in pgp.h, so that it can be used without prerequisites. Remove mbuf.h inclusions in .c files where mbuf.h features are not used directly. (px.h was always used.)
250 lines
5.0 KiB
C
250 lines
5.0 KiB
C
/*
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* pgp-pubenc.c
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* Encrypt session key with public key.
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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-pubenc.c
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*/
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#include "postgres.h"
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#include "px.h"
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#include "pgp.h"
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/*
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* padded msg: 02 || non-zero pad bytes || 00 || msg
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*/
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static int
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pad_eme_pkcs1_v15(uint8 *data, int data_len, int res_len, uint8 **res_p)
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{
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int res;
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uint8 *buf,
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*p;
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int pad_len = res_len - 2 - data_len;
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if (pad_len < 8)
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return PXE_BUG;
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buf = px_alloc(res_len);
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buf[0] = 0x02;
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res = px_get_random_bytes(buf + 1, pad_len);
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if (res < 0)
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{
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px_free(buf);
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return res;
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}
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/* pad must not contain zero bytes */
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p = buf + 1;
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while (p < buf + 1 + pad_len)
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{
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if (*p == 0)
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{
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res = px_get_random_bytes(p, 1);
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if (res < 0)
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break;
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}
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if (*p != 0)
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p++;
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}
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if (res < 0)
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{
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memset(buf, 0, res_len);
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px_free(buf);
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return res;
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}
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buf[pad_len + 1] = 0;
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memcpy(buf + pad_len + 2, data, data_len);
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*res_p = buf;
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return 0;
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}
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static int
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create_secmsg(PGP_Context *ctx, PGP_MPI **msg_p, int full_bytes)
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{
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uint8 *secmsg;
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int res,
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i;
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unsigned cksum = 0;
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int klen = ctx->sess_key_len;
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uint8 *padded = NULL;
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PGP_MPI *m = NULL;
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/* calc checksum */
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for (i = 0; i < klen; i++)
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cksum += ctx->sess_key[i];
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/*
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* create "secret message"
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*/
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secmsg = px_alloc(klen + 3);
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secmsg[0] = ctx->cipher_algo;
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memcpy(secmsg + 1, ctx->sess_key, klen);
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secmsg[klen + 1] = (cksum >> 8) & 0xFF;
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secmsg[klen + 2] = cksum & 0xFF;
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/*
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* now create a large integer of it
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*/
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res = pad_eme_pkcs1_v15(secmsg, klen + 3, full_bytes, &padded);
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if (res >= 0)
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{
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/* first byte will be 0x02 */
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int full_bits = full_bytes * 8 - 6;
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res = pgp_mpi_create(padded, full_bits, &m);
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}
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if (padded)
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{
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memset(padded, 0, full_bytes);
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px_free(padded);
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}
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memset(secmsg, 0, klen + 3);
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px_free(secmsg);
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if (res >= 0)
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*msg_p = m;
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return res;
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}
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static int
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encrypt_and_write_elgamal(PGP_Context *ctx, PGP_PubKey *pk, PushFilter *pkt)
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{
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int res;
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PGP_MPI *m = NULL,
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*c1 = NULL,
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*c2 = NULL;
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/* create padded msg */
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res = create_secmsg(ctx, &m, pk->pub.elg.p->bytes - 1);
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if (res < 0)
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goto err;
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/* encrypt it */
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res = pgp_elgamal_encrypt(pk, m, &c1, &c2);
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if (res < 0)
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goto err;
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/* write out */
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res = pgp_mpi_write(pkt, c1);
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if (res < 0)
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goto err;
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res = pgp_mpi_write(pkt, c2);
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err:
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pgp_mpi_free(m);
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pgp_mpi_free(c1);
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pgp_mpi_free(c2);
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return res;
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}
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static int
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encrypt_and_write_rsa(PGP_Context *ctx, PGP_PubKey *pk, PushFilter *pkt)
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{
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int res;
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PGP_MPI *m = NULL,
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*c = NULL;
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/* create padded msg */
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res = create_secmsg(ctx, &m, pk->pub.rsa.n->bytes - 1);
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if (res < 0)
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goto err;
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/* encrypt it */
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res = pgp_rsa_encrypt(pk, m, &c);
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if (res < 0)
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goto err;
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/* write out */
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res = pgp_mpi_write(pkt, c);
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err:
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pgp_mpi_free(m);
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pgp_mpi_free(c);
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return res;
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}
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int
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pgp_write_pubenc_sesskey(PGP_Context *ctx, PushFilter *dst)
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{
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int res;
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PGP_PubKey *pk = ctx->pub_key;
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uint8 ver = 3;
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PushFilter *pkt = NULL;
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uint8 algo;
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if (pk == NULL)
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{
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px_debug("no pubkey?\n");
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return PXE_BUG;
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}
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algo = pk->algo;
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/*
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* now write packet
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*/
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res = pgp_create_pkt_writer(dst, PGP_PKT_PUBENCRYPTED_SESSKEY, &pkt);
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if (res < 0)
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goto err;
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res = pushf_write(pkt, &ver, 1);
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if (res < 0)
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goto err;
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res = pushf_write(pkt, pk->key_id, 8);
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if (res < 0)
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goto err;
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res = pushf_write(pkt, &algo, 1);
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if (res < 0)
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goto err;
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switch (algo)
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{
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case PGP_PUB_ELG_ENCRYPT:
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res = encrypt_and_write_elgamal(ctx, pk, pkt);
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break;
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case PGP_PUB_RSA_ENCRYPT:
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case PGP_PUB_RSA_ENCRYPT_SIGN:
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res = encrypt_and_write_rsa(ctx, pk, pkt);
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break;
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}
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if (res < 0)
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goto err;
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/*
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* done, signal packet end
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*/
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res = pushf_flush(pkt);
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err:
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if (pkt)
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pushf_free(pkt);
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return res;
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}
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