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
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