| // Copyright 2015 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef NET_DER_TAG_H_ |
| #define NET_DER_TAG_H_ |
| |
| #include <stdint.h> |
| |
| #include "net/base/net_export.h" |
| |
| namespace net { |
| |
| namespace der { |
| |
| // This Tag type represents the identifier for an ASN.1 tag as encoded with DER. |
| // It follows the same bit-for-bit representation (including the class, tag |
| // number, and primitive/constructed bit) as DER. Constants are provided for |
| // universal class types, and functions are provided for building context |
| // specific tags. Tags can also be built from the provided constants and |
| // bitmasks. |
| using Tag = uint8_t; |
| |
| // Universal class primitive types |
| const Tag kBool = 0x01; |
| const Tag kInteger = 0x02; |
| const Tag kBitString = 0x03; |
| const Tag kOctetString = 0x04; |
| const Tag kNull = 0x05; |
| const Tag kOid = 0x06; |
| const Tag kUtf8String = 0x0C; |
| const Tag kPrintableString = 0x13; |
| const Tag kIA5String = 0x16; |
| const Tag kUtcTime = 0x17; |
| const Tag kGeneralizedTime = 0x18; |
| const Tag kUniversalString = 0x1C; |
| const Tag kBmpString = 0x1E; |
| |
| // Universal class constructed types |
| const Tag kSequence = 0x30; |
| const Tag kSet = 0x31; |
| |
| // Primitive/constructed bits |
| const uint8_t kTagPrimitive = 0x00; |
| const uint8_t kTagConstructed = 0x20; |
| |
| // Tag classes |
| const uint8_t kTagUniversal = 0x00; |
| const uint8_t kTagApplication = 0x40; |
| const uint8_t kTagContextSpecific = 0x80; |
| const uint8_t kTagPrivate = 0xC0; |
| |
| // Masks for the 3 components of a tag (class, primitive/constructed, number) |
| const uint8_t kTagNumberMask = 0x1F; |
| const uint8_t kTagConstructionMask = 0x20; |
| const uint8_t kTagClassMask = 0xC0; |
| |
| // Creates the value for the outter tag of an explicitly tagged type. |
| // |
| // The ASN.1 keyword for this is: |
| // [class_number] EXPLICIT |
| // |
| // (Note, the EXPLICIT may be omitted if the entire schema is in |
| // EXPLICIT mode, the default) |
| NET_EXPORT Tag ContextSpecificConstructed(uint8_t class_number); |
| |
| NET_EXPORT Tag ContextSpecificPrimitive(uint8_t base); |
| |
| NET_EXPORT bool IsContextSpecific(Tag tag); |
| |
| NET_EXPORT bool IsConstructed(Tag tag); |
| |
| NET_EXPORT uint8_t GetTagNumber(Tag tag); |
| |
| } // namespace der |
| |
| } // namespace net |
| |
| #endif // NET_DER_TAG_H_ |