xref: /linux/include/linux/asn1_ber_bytecode.h (revision 58e16d792a6a8c6b750f637a4649967fcac853dc)
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* ASN.1 BER/DER/CER parsing state machine internal definitions
3  *
4  * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
5  * Written by David Howells (dhowells@redhat.com)
6  */
7 
8 #ifndef _LINUX_ASN1_BER_BYTECODE_H
9 #define _LINUX_ASN1_BER_BYTECODE_H
10 
11 #ifdef __KERNEL__
12 #include <linux/types.h>
13 #endif
14 #include <linux/asn1.h>
15 
16 typedef int (*asn1_action_t)(void *context,
17 			     size_t hdrlen, /* In case of ANY type */
18 			     unsigned char tag, /* In case of ANY type */
19 			     const void *value, size_t vlen);
20 
21 struct asn1_decoder {
22 	const unsigned char *machine;
23 	size_t machlen;
24 	const asn1_action_t *actions;
25 };
26 
27 enum asn1_opcode {
28 	/* The tag-matching ops come first and the odd-numbered slots
29 	 * are for OR_SKIP ops.
30 	 */
31 #define ASN1_OP_MATCH__SKIP		  0x01
32 #define ASN1_OP_MATCH__ACT		  0x02
33 #define ASN1_OP_MATCH__JUMP		  0x04
34 #define ASN1_OP_MATCH__ANY		  0x08
35 #define ASN1_OP_MATCH__COND		  0x10
36 
37 	ASN1_OP_MATCH			= 0x00,
38 	ASN1_OP_MATCH_OR_SKIP		= 0x01,
39 	ASN1_OP_MATCH_ACT		= 0x02,
40 	ASN1_OP_MATCH_ACT_OR_SKIP	= 0x03,
41 	ASN1_OP_MATCH_JUMP		= 0x04,
42 	ASN1_OP_MATCH_JUMP_OR_SKIP	= 0x05,
43 	ASN1_OP_MATCH_ANY		= 0x08,
44 	ASN1_OP_MATCH_ANY_OR_SKIP	= 0x09,
45 	ASN1_OP_MATCH_ANY_ACT		= 0x0a,
46 	ASN1_OP_MATCH_ANY_ACT_OR_SKIP	= 0x0b,
47 	/* Everything before here matches unconditionally */
48 
49 	ASN1_OP_COND_MATCH_OR_SKIP	= 0x11,
50 	ASN1_OP_COND_MATCH_ACT_OR_SKIP	= 0x13,
51 	ASN1_OP_COND_MATCH_JUMP_OR_SKIP	= 0x15,
52 	ASN1_OP_COND_MATCH_ANY		= 0x18,
53 	ASN1_OP_COND_MATCH_ANY_OR_SKIP	= 0x19,
54 	ASN1_OP_COND_MATCH_ANY_ACT	= 0x1a,
55 	ASN1_OP_COND_MATCH_ANY_ACT_OR_SKIP = 0x1b,
56 
57 	/* Everything before here will want a tag from the data */
58 #define ASN1_OP__MATCHES_TAG ASN1_OP_COND_MATCH_ANY_ACT_OR_SKIP
59 
60 	/* These are here to help fill up space */
61 	ASN1_OP_COND_FAIL		= 0x1c,
62 	ASN1_OP_COMPLETE		= 0x1d,
63 	ASN1_OP_ACT			= 0x1e,
64 	ASN1_OP_MAYBE_ACT		= 0x1f,
65 
66 	/* The following eight have bit 0 -> SET, 1 -> OF, 2 -> ACT */
67 	ASN1_OP_END_SEQ			= 0x20,
68 	ASN1_OP_END_SET			= 0x21,
69 	ASN1_OP_END_SEQ_OF		= 0x22,
70 	ASN1_OP_END_SET_OF		= 0x23,
71 	ASN1_OP_END_SEQ_ACT		= 0x24,
72 	ASN1_OP_END_SET_ACT		= 0x25,
73 	ASN1_OP_END_SEQ_OF_ACT		= 0x26,
74 	ASN1_OP_END_SET_OF_ACT		= 0x27,
75 #define ASN1_OP_END__SET		  0x01
76 #define ASN1_OP_END__OF			  0x02
77 #define ASN1_OP_END__ACT		  0x04
78 
79 	ASN1_OP_RETURN			= 0x28,
80 
81 	ASN1_OP__NR
82 };
83 
84 #define _tag(CLASS, CP, TAG) ((ASN1_##CLASS << 6) | (ASN1_##CP << 5) | ASN1_##TAG)
85 #define _tagn(CLASS, CP, TAG) ((ASN1_##CLASS << 6) | (ASN1_##CP << 5) | TAG)
86 #define _jump_target(N) (N)
87 #define _action(N) (N)
88 
89 #endif /* _LINUX_ASN1_BER_BYTECODE_H */
90