413 lines
8.9 KiB
C
413 lines
8.9 KiB
C
/*
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* openssl.c
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* Wrapper for OpenSSL library.
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*
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* Copyright (c) 2001 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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* $Id: openssl.c,v 1.5 2001/09/23 04:12:44 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 <openssl/evp.h>
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#include <openssl/blowfish.h>
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static uint
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digest_result_size(PX_MD * h)
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{
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return EVP_MD_CTX_size((EVP_MD_CTX *) h->p.ptr);
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}
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static uint
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digest_block_size(PX_MD * h)
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{
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return EVP_MD_CTX_block_size((EVP_MD_CTX *) h->p.ptr);
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}
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static void
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digest_reset(PX_MD * h)
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{
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EVP_MD_CTX *ctx = (EVP_MD_CTX *) h->p.ptr;
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const EVP_MD *md;
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md = EVP_MD_CTX_md(ctx);
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EVP_DigestInit(ctx, md);
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}
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static void
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digest_update(PX_MD * h, const uint8 * data, uint dlen)
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{
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EVP_MD_CTX *ctx = (EVP_MD_CTX *) h->p.ptr;
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EVP_DigestUpdate(ctx, data, dlen);
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}
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static void
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digest_finish(PX_MD * h, uint8 * dst)
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{
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EVP_MD_CTX *ctx = (EVP_MD_CTX *) h->p.ptr;
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EVP_DigestFinal(ctx, dst, NULL);
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}
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static void
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digest_free(PX_MD * h)
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{
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EVP_MD_CTX *ctx = (EVP_MD_CTX *) h->p.ptr;
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px_free(ctx);
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px_free(h);
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}
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/* CIPHERS */
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/*
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* The problem with OpenSSL is that the EVP* family
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* of functions does not allow enough flexibility
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* and forces some of the parameters (keylen,
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* padding) to SSL defaults.
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*/
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typedef struct {
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union {
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struct {
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BF_KEY key;
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int num;
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} bf;
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EVP_CIPHER_CTX evp_ctx;
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} u;
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const EVP_CIPHER *evp_ciph;
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uint8 key[EVP_MAX_KEY_LENGTH];
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uint8 iv[EVP_MAX_IV_LENGTH];
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uint klen;
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uint init;
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} ossldata;
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/* generic EVP */
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static uint
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gen_evp_block_size(PX_Cipher *c)
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{
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ossldata *od = (ossldata *)c->ptr;
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return EVP_CIPHER_block_size(od->evp_ciph);
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}
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static uint
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gen_evp_key_size(PX_Cipher *c)
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{
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ossldata *od = (ossldata *)c->ptr;
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return EVP_CIPHER_key_length(od->evp_ciph);
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}
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static uint
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gen_evp_iv_size(PX_Cipher *c)
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{
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uint ivlen;
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ossldata *od = (ossldata *)c->ptr;
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ivlen = EVP_CIPHER_iv_length(od->evp_ciph);
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return ivlen;
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}
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static void
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gen_evp_free(PX_Cipher *c)
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{
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ossldata *od = (ossldata*)c->ptr;
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memset(od, 0, sizeof(*od));
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pfree(od);
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pfree(c);
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}
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/* fun */
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static int
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gen_evp_init(PX_Cipher *c, const uint8 *key, uint klen, const uint8 *iv)
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{
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ossldata *od = (ossldata*)c->ptr;
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uint bs = gen_evp_block_size(c);
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if (iv) {
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memcpy(od->iv, iv, bs);
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} else
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memset(od->iv, 0, bs);
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memcpy(od->key, key, klen);
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od->klen = klen;
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od->init = 0;
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return 0;
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}
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static void
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_gen_init(PX_Cipher *c, int enc)
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{
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ossldata *od = c->ptr;
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od->evp_ciph->init(&od->u.evp_ctx, od->key, od->iv, enc);
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od->init = 1;
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od->u.evp_ctx.encrypt = enc;
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}
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static int
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gen_evp_encrypt(PX_Cipher *c, const uint8 *data, uint dlen, uint8 *res)
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{
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ossldata *od = c->ptr;
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if (!od->init)
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_gen_init(c, 1);
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od->evp_ciph->do_cipher(&od->u.evp_ctx, res, data, dlen);
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return 0;
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}
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static int
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gen_evp_decrypt(PX_Cipher *c, const uint8 *data, uint dlen, uint8 *res)
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{
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ossldata *od = c->ptr;
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if (!od->init)
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_gen_init(c, 0);
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od->evp_ciph->do_cipher(&od->u.evp_ctx, res, data, dlen);
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return 0;
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}
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/* Blowfish */
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static int
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bf_init(PX_Cipher *c, const uint8 *key, uint klen, const uint8 *iv)
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{
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ossldata *od = c->ptr;
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BF_set_key(&od->u.bf.key, klen, key);
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if (iv) {
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memcpy(od->iv, iv, BF_BLOCK);
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} else
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memset(od->iv, 0, BF_BLOCK);
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od->u.bf.num = 0;
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return 0;
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}
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static int
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bf_ecb_encrypt(PX_Cipher *c, const uint8 *data, uint dlen, uint8 *res)
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{
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uint bs = gen_evp_block_size(c), i;
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ossldata *od = c->ptr;
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for (i = 0; i < dlen / bs; i++)
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BF_ecb_encrypt(data+i*bs, res+i*bs, &od->u.bf.key, BF_ENCRYPT);
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return 0;
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}
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static int
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bf_ecb_decrypt(PX_Cipher *c, const uint8 *data, uint dlen, uint8 *res)
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{
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uint bs = gen_evp_block_size(c), i;
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ossldata *od = c->ptr;
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for (i = 0; i < dlen / bs; i++)
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BF_ecb_encrypt(data+i*bs, res+i*bs, &od->u.bf.key, BF_DECRYPT);
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return 0;
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}
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static int
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bf_cbc_encrypt(PX_Cipher *c, const uint8 *data, uint dlen, uint8 *res)
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{
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ossldata *od = c->ptr;
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BF_cbc_encrypt(data, res, dlen, &od->u.bf.key, od->iv, BF_ENCRYPT);
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return 0;
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}
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static int
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bf_cbc_decrypt(PX_Cipher *c, const uint8 *data, uint dlen, uint8 *res)
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{
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ossldata *od = c->ptr;
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BF_cbc_encrypt(data, res, dlen, &od->u.bf.key, od->iv, BF_DECRYPT);
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return 0;
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}
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static int
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bf_cfb64_encrypt(PX_Cipher *c, const uint8 *data, uint dlen, uint8 *res)
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{
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ossldata *od = c->ptr;
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BF_cfb64_encrypt(data, res, dlen, &od->u.bf.key, od->iv,
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&od->u.bf.num, BF_ENCRYPT);
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return 0;
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}
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static int
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bf_cfb64_decrypt(PX_Cipher *c, const uint8 *data, uint dlen, uint8 *res)
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{
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ossldata *od = c->ptr;
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BF_cfb64_encrypt(data, res, dlen, &od->u.bf.key, od->iv,
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&od->u.bf.num, BF_DECRYPT);
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return 0;
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}
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static int
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bf_ofb64_encrypt(PX_Cipher *c, const uint8 *data, uint dlen, uint8 *res)
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{
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ossldata *od = c->ptr;
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BF_ofb64_encrypt(data, res, dlen, &od->u.bf.key, od->iv, &od->u.bf.num);
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return 0;
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}
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static int
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bf_ofb64_decrypt(PX_Cipher *c, const uint8 *data, uint dlen, uint8 *res)
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{
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ossldata *od = c->ptr;
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BF_ofb64_encrypt(data, res, dlen, &od->u.bf.key, od->iv, &od->u.bf.num);
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return 0;
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}
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/*
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* aliases
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*/
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static PX_Alias ossl_aliases [] = {
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{ "bf", "bf-cbc" },
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{ "blowfish", "bf-cbc" },
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{ "blowfish-cbc", "bf-cbc" },
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{ "blowfish-ecb", "bf-ecb" },
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{ "blowfish-cfb", "bf-cfb" },
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{ "blowfish-ofb", "bf-ofb" },
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{ NULL }
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};
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/*
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static PX_Alias ossl_mode_aliases [] = {
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{ "cfb64", "cfb" },
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{ "ofb64", "ofb" },
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{ NULL }
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};*/
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/*
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* Special handlers
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*/
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struct {
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char *name;
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PX_Cipher cf;
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} spec_types [] = {
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{ "bf-cbc", { gen_evp_block_size, gen_evp_key_size, gen_evp_iv_size,
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bf_init, bf_cbc_encrypt, bf_cbc_decrypt, gen_evp_free}},
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{ "bf-ecb", { gen_evp_block_size, gen_evp_key_size, gen_evp_iv_size,
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bf_init, bf_ecb_encrypt, bf_ecb_decrypt, gen_evp_free}},
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{ "bf-cfb", { gen_evp_block_size, gen_evp_key_size, gen_evp_iv_size,
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bf_init, bf_cfb64_encrypt, bf_cfb64_decrypt, gen_evp_free}},
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{ "bf-ofb", { gen_evp_block_size, gen_evp_key_size, gen_evp_iv_size,
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bf_init, bf_ofb64_encrypt, bf_ofb64_decrypt, gen_evp_free}},
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{ NULL }
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};
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/*
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* Generic EVP_* functions handler
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*/
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static PX_Cipher gen_evp_handler = {
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gen_evp_block_size, gen_evp_key_size, gen_evp_iv_size,
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gen_evp_init, gen_evp_encrypt, gen_evp_decrypt, gen_evp_free
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};
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static int px_openssl_initialized = 0;
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/* ATM not needed
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static void *o_alloc(uint s) { return px_alloc(s); }
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static void *o_realloc(void *p) { return px_realloc(p); }
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static void o_free(void *p) { px_free(p); }
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*/
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/* PUBLIC functions */
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int
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px_find_digest(const char *name, PX_MD **res)
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{
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const EVP_MD *md;
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EVP_MD_CTX *ctx;
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PX_MD *h;
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if (!px_openssl_initialized)
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{
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px_openssl_initialized = 1;
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/*CRYPTO_set_mem_functions(o_alloc, o_realloc, o_free);*/
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OpenSSL_add_all_algorithms();
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}
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md = EVP_get_digestbyname(name);
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if (md == NULL)
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return -1;
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ctx = px_alloc(sizeof(*ctx));
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EVP_DigestInit(ctx, md);
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h = px_alloc(sizeof(*h));
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h->result_size = digest_result_size;
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h->block_size = digest_block_size;
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h->reset = digest_reset;
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h->update = digest_update;
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h->finish = digest_finish;
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h->free = digest_free;
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h->p.ptr = (void *) ctx;
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*res = h;
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return 0;
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}
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int
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px_find_cipher(const char *name, PX_Cipher **res)
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{
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uint i;
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PX_Cipher *c = NULL, *csrc;
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ossldata *od;
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const EVP_CIPHER *evp_c;
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if (!px_openssl_initialized) {
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px_openssl_initialized = 1;
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/*CRYPTO_set_mem_functions(o_alloc, o_realloc, o_free);*/
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OpenSSL_add_all_algorithms();
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}
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name = px_resolve_alias(ossl_aliases, name);
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evp_c = EVP_get_cipherbyname(name);
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if (evp_c == NULL)
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return -1;
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od = px_alloc(sizeof(*od));
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memset(od, 0, sizeof(*od));
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od->evp_ciph = evp_c;
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csrc = NULL;
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for (i = 0; spec_types[i].name; i++)
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if (!strcmp(name, spec_types[i].name)) {
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csrc = &spec_types[i].cf;
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break;
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}
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if (csrc == NULL)
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csrc = &gen_evp_handler;
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c = px_alloc(sizeof(*c));
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memcpy(c, csrc, sizeof(*c));
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c->ptr = od;
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*res = c;
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return 0;
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}
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