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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.)
265 lines
5.7 KiB
C
265 lines
5.7 KiB
C
/*
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* pgp-cfb.c
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* Implements both normal and PGP-specific CFB mode.
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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-cfb.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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typedef int (*mix_data_t) (PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst);
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struct PGP_CFB
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{
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PX_Cipher *ciph;
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int block_size;
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int pos;
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int block_no;
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int resync;
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uint8 fr[PGP_MAX_BLOCK];
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uint8 fre[PGP_MAX_BLOCK];
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uint8 encbuf[PGP_MAX_BLOCK];
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};
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int
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pgp_cfb_create(PGP_CFB **ctx_p, int algo, const uint8 *key, int key_len,
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int resync, uint8 *iv)
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{
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int res;
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PX_Cipher *ciph;
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PGP_CFB *ctx;
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res = pgp_load_cipher(algo, &ciph);
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if (res < 0)
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return res;
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res = px_cipher_init(ciph, key, key_len, NULL);
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if (res < 0)
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{
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px_cipher_free(ciph);
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return res;
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}
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ctx = px_alloc(sizeof(*ctx));
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memset(ctx, 0, sizeof(*ctx));
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ctx->ciph = ciph;
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ctx->block_size = px_cipher_block_size(ciph);
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ctx->resync = resync;
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if (iv)
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memcpy(ctx->fr, iv, ctx->block_size);
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*ctx_p = ctx;
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return 0;
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}
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void
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pgp_cfb_free(PGP_CFB *ctx)
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{
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px_cipher_free(ctx->ciph);
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memset(ctx, 0, sizeof(*ctx));
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px_free(ctx);
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}
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/*
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* Data processing for normal CFB. (PGP_PKT_SYMENCRYPTED_DATA_MDC)
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*/
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static int
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mix_encrypt_normal(PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst)
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{
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int i;
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for (i = ctx->pos; i < ctx->pos + len; i++)
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*dst++ = ctx->encbuf[i] = ctx->fre[i] ^ (*data++);
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ctx->pos += len;
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return len;
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}
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static int
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mix_decrypt_normal(PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst)
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{
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int i;
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for (i = ctx->pos; i < ctx->pos + len; i++)
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{
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ctx->encbuf[i] = *data++;
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*dst++ = ctx->fre[i] ^ ctx->encbuf[i];
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}
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ctx->pos += len;
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return len;
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}
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/*
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* Data processing for old PGP CFB mode. (PGP_PKT_SYMENCRYPTED_DATA)
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*
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* The goal is to hide the horror from the rest of the code,
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* thus its all concentrated here.
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*/
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static int
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mix_encrypt_resync(PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst)
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{
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int i,
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n;
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/* block #2 is 2 bytes long */
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if (ctx->block_no == 2)
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{
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n = 2 - ctx->pos;
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if (len < n)
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n = len;
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for (i = ctx->pos; i < ctx->pos + n; i++)
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*dst++ = ctx->encbuf[i] = ctx->fre[i] ^ (*data++);
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ctx->pos += n;
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len -= n;
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if (ctx->pos == 2)
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{
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memcpy(ctx->fr, ctx->encbuf + 2, ctx->block_size - 2);
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memcpy(ctx->fr + ctx->block_size - 2, ctx->encbuf, 2);
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ctx->pos = 0;
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return n;
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}
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}
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for (i = ctx->pos; i < ctx->pos + len; i++)
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*dst++ = ctx->encbuf[i] = ctx->fre[i] ^ (*data++);
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ctx->pos += len;
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return len;
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}
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static int
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mix_decrypt_resync(PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst)
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{
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int i,
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n;
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/* block #2 is 2 bytes long */
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if (ctx->block_no == 2)
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{
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n = 2 - ctx->pos;
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if (len < n)
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n = len;
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for (i = ctx->pos; i < ctx->pos + n; i++)
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{
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ctx->encbuf[i] = *data++;
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*dst++ = ctx->fre[i] ^ ctx->encbuf[i];
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}
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ctx->pos += n;
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len -= n;
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if (ctx->pos == 2)
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{
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memcpy(ctx->fr, ctx->encbuf + 2, ctx->block_size - 2);
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memcpy(ctx->fr + ctx->block_size - 2, ctx->encbuf, 2);
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ctx->pos = 0;
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return n;
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}
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}
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for (i = ctx->pos; i < ctx->pos + len; i++)
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{
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ctx->encbuf[i] = *data++;
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*dst++ = ctx->fre[i] ^ ctx->encbuf[i];
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}
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ctx->pos += len;
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return len;
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}
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/*
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* common code for both encrypt and decrypt.
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*/
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static int
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cfb_process(PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst,
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mix_data_t mix_data)
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{
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int n;
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int res;
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while (len > 0 && ctx->pos > 0)
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{
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n = ctx->block_size - ctx->pos;
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if (len < n)
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n = len;
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n = mix_data(ctx, data, n, dst);
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data += n;
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dst += n;
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len -= n;
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if (ctx->pos == ctx->block_size)
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{
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memcpy(ctx->fr, ctx->encbuf, ctx->block_size);
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ctx->pos = 0;
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}
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}
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while (len > 0)
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{
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px_cipher_encrypt(ctx->ciph, ctx->fr, ctx->block_size, ctx->fre);
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if (ctx->block_no < 5)
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ctx->block_no++;
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n = ctx->block_size;
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if (len < n)
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n = len;
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res = mix_data(ctx, data, n, dst);
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data += res;
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dst += res;
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len -= res;
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if (ctx->pos == ctx->block_size)
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{
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memcpy(ctx->fr, ctx->encbuf, ctx->block_size);
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ctx->pos = 0;
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}
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}
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return 0;
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}
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/*
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* public interface
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*/
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int
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pgp_cfb_encrypt(PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst)
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{
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mix_data_t mix = ctx->resync ? mix_encrypt_resync : mix_encrypt_normal;
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return cfb_process(ctx, data, len, dst, mix);
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}
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int
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pgp_cfb_decrypt(PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst)
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{
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mix_data_t mix = ctx->resync ? mix_decrypt_resync : mix_decrypt_normal;
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return cfb_process(ctx, data, len, dst, mix);
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}
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