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// Copyright (c) 2011 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_BASE_ASN1_UTIL_H_
#define NET_BASE_ASN1_UTIL_H_
#pragma once
#include "base/string_piece.h"
#include "net/base/net_api.h"
namespace net {
namespace asn1 {
// These are the DER encodings of the tag byte for ASN.1 objects.
static const unsigned kINTEGER = 0x02;
static const unsigned kOID = 0x06;
static const unsigned kSEQUENCE = 0x30;
// These are flags that can be ORed with the above tag numbers.
static const unsigned kContextSpecific = 0x80;
static const unsigned kCompound = 0x20;
// ParseElement parses a DER encoded ASN1 element from |in|, requiring that
// it have the given |tag_value|. It returns true on success. The following
// limitations are imposed:
// 1) tag numbers > 31 are not permitted.
// 2) lengths > 65535 are not permitted.
// On successful return:
// |in| is advanced over the element
// |out| contains the element, including the tag and length bytes.
// |out_header_len| contains the length of the tag and length bytes in |out|.
bool ParseElement(base::StringPiece* in,
unsigned tag_value,
base::StringPiece* out,
unsigned *out_header_len);
// GetElement performs the same actions as ParseElement, except that the header
// bytes are not included in the output.
bool GetElement(base::StringPiece* in,
unsigned tag_value,
base::StringPiece* out);
// ExtractSPKIFromDERCert parses the DER encoded certificate in |cert| and
// extracts the bytes of the SubjectPublicKeyInfo. On successful return,
// |spki_out| is set to contain the SPKI, pointing into |cert|.
NET_TEST bool ExtractSPKIFromDERCert(base::StringPiece cert,
base::StringPiece* spki_out);
} // namespace asn1
} // namespace net
#endif // NET_BASE_ASN1_UTIL_H_
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