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Annotation of src/usr.bin/ssh/cipher-bf1.c, Revision 1.1.16.1

1.1.16.1! brad        1: /* $OpenBSD: cipher-bf1.c,v 1.5 2006/08/03 03:34:42 deraadt Exp $ */
1.1       markus      2: /*
                      3:  * Copyright (c) 2003 Markus Friedl.  All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  *
                     14:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     15:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     16:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     17:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     18:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     19:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     20:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     21:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     22:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     23:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     24:  */
                     25:
1.1.16.1! brad       26: #include <sys/types.h>
1.1       markus     27:
                     28: #include <openssl/evp.h>
1.1.16.1! brad       29:
        !            30: #include <string.h>
        !            31:
1.1       markus     32: #include "xmalloc.h"
                     33: #include "log.h"
                     34: /*
                     35:  * SSH1 uses a variation on Blowfish, all bytes must be swapped before
                     36:  * and after encryption/decryption. Thus the swap_bytes stuff (yuk).
                     37:  */
                     38:
                     39: const EVP_CIPHER * evp_ssh1_bf(void);
                     40:
                     41: static void
                     42: swap_bytes(const u_char *src, u_char *dst, int n)
                     43: {
                     44:        u_char c[4];
                     45:
                     46:        /* Process 4 bytes every lap. */
                     47:        for (n = n / 4; n > 0; n--) {
                     48:                c[3] = *src++;
                     49:                c[2] = *src++;
                     50:                c[1] = *src++;
                     51:                c[0] = *src++;
                     52:
                     53:                *dst++ = c[0];
                     54:                *dst++ = c[1];
                     55:                *dst++ = c[2];
                     56:                *dst++ = c[3];
                     57:        }
                     58: }
                     59:
                     60: static int (*orig_bf)(EVP_CIPHER_CTX *, u_char *, const u_char *, u_int) = NULL;
                     61:
                     62: static int
                     63: bf_ssh1_cipher(EVP_CIPHER_CTX *ctx, u_char *out, const u_char *in, u_int len)
                     64: {
                     65:        int ret;
                     66:
                     67:        swap_bytes(in, out, len);
                     68:        ret = (*orig_bf)(ctx, out, out, len);
                     69:        swap_bytes(out, out, len);
                     70:        return (ret);
                     71: }
                     72:
                     73: const EVP_CIPHER *
                     74: evp_ssh1_bf(void)
                     75: {
                     76:        static EVP_CIPHER ssh1_bf;
                     77:
                     78:        memcpy(&ssh1_bf, EVP_bf_cbc(), sizeof(EVP_CIPHER));
                     79:        orig_bf = ssh1_bf.do_cipher;
                     80:        ssh1_bf.nid = NID_undef;
                     81:        ssh1_bf.do_cipher = bf_ssh1_cipher;
                     82:        ssh1_bf.key_len = 32;
                     83:        return (&ssh1_bf);
                     84: }