security/nss/lib/util/secasn1u.c@6474c204b198 (annotated)
security/nss/lib/util/secasn1u.c
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 2 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 3 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 4 | |
| michael@0 | 5 | /* |
| michael@0 | 6 | * Utility routines to complement the ASN.1 encoding and decoding functions. |
| michael@0 | 7 | */ |
| michael@0 | 8 | |
| michael@0 | 9 | #include "secasn1.h" |
| michael@0 | 10 | |
| michael@0 | 11 | |
| michael@0 | 12 | /* |
| michael@0 | 13 | * We have a length that needs to be encoded; how many bytes will the |
| michael@0 | 14 | * encoding take? |
| michael@0 | 15 | * |
| michael@0 | 16 | * The rules are that 0 - 0x7f takes one byte (the length itself is the |
| michael@0 | 17 | * entire encoding); everything else takes one plus the number of bytes |
| michael@0 | 18 | * in the length. |
| michael@0 | 19 | */ |
| michael@0 | 20 | int |
| michael@0 | 21 | SEC_ASN1LengthLength (unsigned long len) |
| michael@0 | 22 | { |
| michael@0 | 23 | int lenlen = 1; |
| michael@0 | 24 | |
| michael@0 | 25 | if (len > 0x7f) { |
| michael@0 | 26 | do { |
| michael@0 | 27 | lenlen++; |
| michael@0 | 28 | len >>= 8; |
| michael@0 | 29 | } while (len); |
| michael@0 | 30 | } |
| michael@0 | 31 | |
| michael@0 | 32 | return lenlen; |
| michael@0 | 33 | } |
| michael@0 | 34 | |
| michael@0 | 35 | |
| michael@0 | 36 | /* |
| michael@0 | 37 | * XXX Move over (and rewrite as appropriate) the rest of the |
| michael@0 | 38 | * stuff in dersubr.c! |
| michael@0 | 39 | */ |
| michael@0 | 40 | |
| michael@0 | 41 | |
| michael@0 | 42 | /* |
| michael@0 | 43 | * Find the appropriate subtemplate for the given template. |
| michael@0 | 44 | * This may involve calling a "chooser" function, or it may just |
| michael@0 | 45 | * be right there. In either case, it is expected to *have* a |
| michael@0 | 46 | * subtemplate; this is asserted in debug builds (in non-debug |
| michael@0 | 47 | * builds, NULL will be returned). |
| michael@0 | 48 | * |
| michael@0 | 49 | * "thing" is a pointer to the structure being encoded/decoded |
| michael@0 | 50 | * "encoding", when true, means that we are in the process of encoding |
| michael@0 | 51 | * (as opposed to in the process of decoding) |
| michael@0 | 52 | */ |
| michael@0 | 53 | const SEC_ASN1Template * |
| michael@0 | 54 | SEC_ASN1GetSubtemplate (const SEC_ASN1Template *theTemplate, void *thing, |
| michael@0 | 55 | PRBool encoding) |
| michael@0 | 56 | { |
| michael@0 | 57 | const SEC_ASN1Template *subt = NULL; |
| michael@0 | 58 | |
| michael@0 | 59 | PORT_Assert (theTemplate->sub != NULL); |
| michael@0 | 60 | if (theTemplate->sub != NULL) { |
| michael@0 | 61 | if (theTemplate->kind & SEC_ASN1_DYNAMIC) { |
| michael@0 | 62 | SEC_ASN1TemplateChooserPtr chooserp; |
| michael@0 | 63 | |
| michael@0 | 64 | chooserp = *(SEC_ASN1TemplateChooserPtr *) theTemplate->sub; |
| michael@0 | 65 | if (chooserp) { |
| michael@0 | 66 | if (thing != NULL) |
| michael@0 | 67 | thing = (char *)thing - theTemplate->offset; |
| michael@0 | 68 | subt = (* chooserp)(thing, encoding); |
| michael@0 | 69 | } |
| michael@0 | 70 | } else { |
| michael@0 | 71 | subt = (SEC_ASN1Template*)theTemplate->sub; |
| michael@0 | 72 | } |
| michael@0 | 73 | } |
| michael@0 | 74 | return subt; |
| michael@0 | 75 | } |
| michael@0 | 76 | |
| michael@0 | 77 | PRBool SEC_ASN1IsTemplateSimple(const SEC_ASN1Template *theTemplate) |
| michael@0 | 78 | { |
| michael@0 | 79 | if (!theTemplate) { |
| michael@0 | 80 | return PR_TRUE; /* it doesn't get any simpler than NULL */ |
| michael@0 | 81 | } |
| michael@0 | 82 | /* only templates made of one primitive type or a choice of primitive |
| michael@0 | 83 | types are considered simple */ |
| michael@0 | 84 | if (! (theTemplate->kind & (~SEC_ASN1_TAGNUM_MASK))) { |
| michael@0 | 85 | return PR_TRUE; /* primitive type */ |
| michael@0 | 86 | } |
| michael@0 | 87 | if (!(theTemplate->kind & SEC_ASN1_CHOICE)) { |
| michael@0 | 88 | return PR_FALSE; /* no choice means not simple */ |
| michael@0 | 89 | } |
| michael@0 | 90 | while (++theTemplate && theTemplate->kind) { |
| michael@0 | 91 | if (theTemplate->kind & (~SEC_ASN1_TAGNUM_MASK)) { |
| michael@0 | 92 | return PR_FALSE; /* complex type */ |
| michael@0 | 93 | } |
| michael@0 | 94 | } |
| michael@0 | 95 | return PR_TRUE; /* choice of primitive types */ |
| michael@0 | 96 | } |
| michael@0 | 97 |
