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Annotation of src/usr.bin/ssh/cipher-bf1.c, Revision 1.1

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