162 lines
4.5 KiB
C
162 lines
4.5 KiB
C
/*
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* Copyright (c) 2003 Markus Friedl. 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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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/* compatibility with old or broken OpenSSL versions */
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#include "openbsd-compat/openssl-compat.h"
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#ifdef USE_BUILTIN_RIJNDAEL
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#include <sys/types.h>
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#include <openssl/evp.h>
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#include <stdarg.h>
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#include <string.h>
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#include "rijndael.h"
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#include "xmalloc.h"
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#include "log.h"
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#define RIJNDAEL_BLOCKSIZE 16
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struct ssh_rijndael_ctx
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{
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rijndael_ctx r_ctx;
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u_char r_iv[RIJNDAEL_BLOCKSIZE];
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};
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static int
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ssh_rijndael_init(EVP_CIPHER_CTX *ctx, const u_char *key, const u_char *iv,
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int enc)
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{
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struct ssh_rijndael_ctx *c;
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if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) {
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c = xmalloc(sizeof(*c));
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EVP_CIPHER_CTX_set_app_data(ctx, c);
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}
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if (key != NULL) {
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if (enc == -1)
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enc = ctx->encrypt;
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rijndael_set_key(&c->r_ctx, (u_char *)key,
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8*EVP_CIPHER_CTX_key_length(ctx), enc);
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}
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if (iv != NULL)
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memcpy(c->r_iv, iv, RIJNDAEL_BLOCKSIZE);
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return (1);
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}
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static int
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ssh_rijndael_cbc(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src,
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LIBCRYPTO_EVP_INL_TYPE len)
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{
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struct ssh_rijndael_ctx *c;
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u_char buf[RIJNDAEL_BLOCKSIZE];
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u_char *cprev, *cnow, *plain, *ivp;
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int i, j, blocks = len / RIJNDAEL_BLOCKSIZE;
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if (len == 0)
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return (1);
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if (len % RIJNDAEL_BLOCKSIZE)
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fatal("ssh_rijndael_cbc: bad len %d", len);
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if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) {
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error("ssh_rijndael_cbc: no context");
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return (0);
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}
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if (ctx->encrypt) {
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cnow = dest;
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plain = (u_char *)src;
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cprev = c->r_iv;
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for (i = 0; i < blocks; i++, plain+=RIJNDAEL_BLOCKSIZE,
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cnow+=RIJNDAEL_BLOCKSIZE) {
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for (j = 0; j < RIJNDAEL_BLOCKSIZE; j++)
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buf[j] = plain[j] ^ cprev[j];
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rijndael_encrypt(&c->r_ctx, buf, cnow);
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cprev = cnow;
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}
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memcpy(c->r_iv, cprev, RIJNDAEL_BLOCKSIZE);
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} else {
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cnow = (u_char *) (src+len-RIJNDAEL_BLOCKSIZE);
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plain = dest+len-RIJNDAEL_BLOCKSIZE;
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memcpy(buf, cnow, RIJNDAEL_BLOCKSIZE);
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for (i = blocks; i > 0; i--, cnow-=RIJNDAEL_BLOCKSIZE,
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plain-=RIJNDAEL_BLOCKSIZE) {
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rijndael_decrypt(&c->r_ctx, cnow, plain);
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ivp = (i == 1) ? c->r_iv : cnow-RIJNDAEL_BLOCKSIZE;
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for (j = 0; j < RIJNDAEL_BLOCKSIZE; j++)
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plain[j] ^= ivp[j];
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}
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memcpy(c->r_iv, buf, RIJNDAEL_BLOCKSIZE);
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}
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return (1);
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}
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static int
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ssh_rijndael_cleanup(EVP_CIPHER_CTX *ctx)
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{
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struct ssh_rijndael_ctx *c;
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if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) != NULL) {
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memset(c, 0, sizeof(*c));
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free(c);
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EVP_CIPHER_CTX_set_app_data(ctx, NULL);
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}
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return (1);
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}
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void
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ssh_rijndael_iv(EVP_CIPHER_CTX *evp, int doset, u_char * iv, u_int len)
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{
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struct ssh_rijndael_ctx *c;
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if ((c = EVP_CIPHER_CTX_get_app_data(evp)) == NULL)
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fatal("ssh_rijndael_iv: no context");
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if (doset)
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memcpy(c->r_iv, iv, len);
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else
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memcpy(iv, c->r_iv, len);
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}
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const EVP_CIPHER *
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evp_rijndael(void)
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{
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static EVP_CIPHER rijndal_cbc;
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memset(&rijndal_cbc, 0, sizeof(EVP_CIPHER));
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rijndal_cbc.nid = NID_undef;
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rijndal_cbc.block_size = RIJNDAEL_BLOCKSIZE;
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rijndal_cbc.iv_len = RIJNDAEL_BLOCKSIZE;
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rijndal_cbc.key_len = 16;
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rijndal_cbc.init = ssh_rijndael_init;
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rijndal_cbc.cleanup = ssh_rijndael_cleanup;
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rijndal_cbc.do_cipher = ssh_rijndael_cbc;
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#ifndef SSH_OLD_EVP
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rijndal_cbc.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH |
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EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CUSTOM_IV;
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#endif
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return (&rijndal_cbc);
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}
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#endif /* USE_BUILTIN_RIJNDAEL */
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