Return to cipher-bf1.c CVS log

Up to [local] / src / usr.bin / ssh

Annotation of src/usr.bin/ssh/cipher-bf1.c, Revision 1.7

1.7     ! markus      1: /* $OpenBSD: cipher-bf1.c,v 1.6 2010/10/01 23:05:32 djm Exp $ */
1.1       markus      2: /*
                      3:  * Copyright (c) 2003 Markus Friedl.  All rights reserved.
                      4:  *
1.7     ! markus      5:  * Permission to use, copy, modify, and distribute this software for any
        !             6:  * purpose with or without fee is hereby granted, provided that the above
        !             7:  * copyright notice and this permission notice appear in all copies.
1.1       markus      8:  *
                      9:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     10:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     11:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     12:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     13:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     14:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     15:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     16:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     17:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     18:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     19:  */
                     20:
1.5       deraadt    21: #include <sys/types.h>
1.7     ! markus     22: #include <string.h>
1.1       markus     23: #include <openssl/evp.h>
1.4       stevesk    24:
1.1       markus     25: /*
                     26:  * SSH1 uses a variation on Blowfish, all bytes must be swapped before
                     27:  * and after encryption/decryption. Thus the swap_bytes stuff (yuk).
                     28:  */
                     29:
                     30: const EVP_CIPHER * evp_ssh1_bf(void);
                     31:
                     32: static void
                     33: swap_bytes(const u_char *src, u_char *dst, int n)
                     34: {
                     35:        u_char c[4];
                     36:
                     37:        /* Process 4 bytes every lap. */
                     38:        for (n = n / 4; n > 0; n--) {
                     39:                c[3] = *src++;
                     40:                c[2] = *src++;
                     41:                c[1] = *src++;
                     42:                c[0] = *src++;
                     43:
                     44:                *dst++ = c[0];
                     45:                *dst++ = c[1];
                     46:                *dst++ = c[2];
                     47:                *dst++ = c[3];
                     48:        }
                     49: }
                     50:
1.6       djm        51: static int (*orig_bf)(EVP_CIPHER_CTX *, u_char *,
                     52:     const u_char *, size_t) = NULL;
1.1       markus     53:
                     54: static int
1.6       djm        55: bf_ssh1_cipher(EVP_CIPHER_CTX *ctx, u_char *out, const u_char *in, size_t len)
1.1       markus     56: {
                     57:        int ret;
                     58:
                     59:        swap_bytes(in, out, len);
                     60:        ret = (*orig_bf)(ctx, out, out, len);
                     61:        swap_bytes(out, out, len);
                     62:        return (ret);
                     63: }
                     64:
                     65: const EVP_CIPHER *
                     66: evp_ssh1_bf(void)
                     67: {
                     68:        static EVP_CIPHER ssh1_bf;
                     69:
                     70:        memcpy(&ssh1_bf, EVP_bf_cbc(), sizeof(EVP_CIPHER));
                     71:        orig_bf = ssh1_bf.do_cipher;
                     72:        ssh1_bf.nid = NID_undef;
                     73:        ssh1_bf.do_cipher = bf_ssh1_cipher;
                     74:        ssh1_bf.key_len = 32;
                     75:        return (&ssh1_bf);
                     76: }