1 /* Copyright (C) 1999 Aladdin Enterprises. All rights reserved.
2
3 This software is provided AS-IS with no warranty, either express or
4 implied.
5
6 This software is distributed under license and may not be copied,
7 modified or distributed except as expressly authorized under the terms
8 of the license contained in the file LICENSE in this distribution.
9
10 For more information about licensing, please refer to
11 http://www.ghostscript.com/licensing/. For information on
12 commercial licensing, go to http://www.artifex.com/licensing/ or
13 contact Artifex Software, Inc., 101 Lucas Valley Road #110,
14 San Rafael, CA 94903, U.S.A., +1(415)492-9861.
15 */
16
17 /* $Id: gscrypt1.c,v 1.4 2002/02/21 22:24:52 giles Exp $ */
18 /* Adobe Type 1 encryption/decryption. */
19 #include "stdpre.h"
20 #include "gstypes.h"
21 #include "gscrypt1.h"
22
23 /* Encrypt a string. */
24 int
gs_type1_encrypt(byte * dest,const byte * src,uint len,crypt_state * pstate)25 gs_type1_encrypt(byte * dest, const byte * src, uint len, crypt_state * pstate)
26 {
27 crypt_state state = *pstate;
28 const byte *from = src;
29 byte *to = dest;
30 uint count = len;
31
32 while (count) {
33 encrypt_next(*from, state, *to);
34 from++, to++, count--;
35 }
36 *pstate = state;
37 return 0;
38 }
39 /* Decrypt a string. */
40 int
gs_type1_decrypt(byte * dest,const byte * src,uint len,crypt_state * pstate)41 gs_type1_decrypt(byte * dest, const byte * src, uint len, crypt_state * pstate)
42 {
43 crypt_state state = *pstate;
44 const byte *from = src;
45 byte *to = dest;
46 uint count = len;
47
48 while (count) {
49 /* If from == to, we can't use the obvious */
50 /* decrypt_next(*from, state, *to); */
51 byte ch = *from++;
52
53 decrypt_next(ch, state, *to);
54 to++, count--;
55 }
56 *pstate = state;
57 return 0;
58 }
59