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fix encoding/decoding of optional attributes

pull/2/head
weidai 2004-06-19 08:26:29 +00:00
parent 60a5c4331c
commit 40a5b80a45
2 changed files with 50 additions and 13 deletions
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43
asn.cpp
View File

@ -195,6 +195,23 @@ unsigned int BERDecodeBitString(BufferedTransformation &bt, SecByteBlock &str, u
return bc-1;
}
void DERReencode(BufferedTransformation &source, BufferedTransformation &dest)
{
byte tag;
source.Peek(tag);
BERGeneralDecoder decoder(source, tag);
DERGeneralEncoder encoder(dest, tag);
if (decoder.IsDefiniteLength())
decoder.TransferTo(encoder, decoder.RemainingLength());
else
{
while (!decoder.EndReached())
DERReencode(decoder, encoder);
}
decoder.MessageEnd();
encoder.MessageEnd();
}
void OID::EncodeValue(BufferedTransformation &bt, unsigned long v)
{
for (unsigned int i=RoundUpToMultipleOf(STDMAX(7U,BitPrecision(v)), 7U)-7; i != 0; i-=7)
@ -354,15 +371,16 @@ void EncodedObjectFilter::Put(const byte *inString, unsigned int length)
BERGeneralDecoder::BERGeneralDecoder(BufferedTransformation &inQueue, byte asnTag)
: m_inQueue(inQueue), m_finished(false)
{
byte b;
if (!m_inQueue.Get(b) || b != asnTag)
BERDecodeError();
m_definiteLength = BERLengthDecode(m_inQueue, m_length);
Init(asnTag);
}
BERGeneralDecoder::BERGeneralDecoder(BERGeneralDecoder &inQueue, byte asnTag)
: m_inQueue(inQueue), m_finished(false)
{
Init(asnTag);
}
void BERGeneralDecoder::Init(byte asnTag)
{
byte b;
if (!m_inQueue.Get(b) || b != asnTag)
@ -370,7 +388,7 @@ BERGeneralDecoder::BERGeneralDecoder(BERGeneralDecoder &inQueue, byte asnTag)
m_definiteLength = BERLengthDecode(m_inQueue, m_length);
if (!m_definiteLength && !(asnTag & CONSTRUCTED))
BERDecodeError(); // cannot be primitive have indefinite length
BERDecodeError(); // cannot be primitive and have indefinite length
}
BERGeneralDecoder::~BERGeneralDecoder()
@ -534,7 +552,8 @@ void PKCS8PrivateKey::BERDecode(BufferedTransformation &bt)
BERDecodeKey2(octetString, parametersPresent, privateKeyInfo.RemainingLength());
octetString.MessageEnd();
BERDecodeOptionalAttributes(privateKeyInfo);
if (!privateKeyInfo.EndReached())
BERDecodeOptionalAttributes(privateKeyInfo);
privateKeyInfo.MessageEnd();
}
@ -556,6 +575,16 @@ void PKCS8PrivateKey::DEREncode(BufferedTransformation &bt) const
privateKeyInfo.MessageEnd();
}
void PKCS8PrivateKey::BERDecodeOptionalAttributes(BufferedTransformation &bt)
{
DERReencode(bt, m_optionalAttributes);
}
void PKCS8PrivateKey::DEREncodeOptionalAttributes(BufferedTransformation &bt) const
{
m_optionalAttributes.CopyTo(bt);
}
NAMESPACE_END
#endif

20
asn.h
View File

@ -75,6 +75,9 @@ CRYPTOPP_DLL unsigned int BERDecodeTextString(BufferedTransformation &in, std::s
CRYPTOPP_DLL unsigned int DEREncodeBitString(BufferedTransformation &out, const byte *str, unsigned int strLen, unsigned int unusedBits=0);
CRYPTOPP_DLL unsigned int BERDecodeBitString(BufferedTransformation &in, SecByteBlock &str, unsigned int &unusedBits);
// BER decode from source and DER reencode into dest
CRYPTOPP_DLL void DERReencode(BufferedTransformation &source, BufferedTransformation &dest);
//! Object Identifier
class CRYPTOPP_DLL OID
{
@ -147,6 +150,7 @@ protected:
unsigned int m_length;
private:
void Init(byte asnTag);
void StoreInitialize(const NameValuePairs &parameters) {assert(false);}
unsigned int ReduceLength(unsigned int delta);
};
@ -221,8 +225,8 @@ public:
}
void DEREncode(BufferedTransformation &out)
{
if (get() != NULL)
get()->DEREncode(out);
if (this->get() != NULL)
this->get()->DEREncode(out);
}
};
@ -259,10 +263,14 @@ public:
void BERDecode(BufferedTransformation &bt);
void DEREncode(BufferedTransformation &bt) const;
virtual void BERDecodeOptionalAttributes(BufferedTransformation &bt)
{} // TODO: skip optional attributes if present
virtual void DEREncodeOptionalAttributes(BufferedTransformation &bt) const
{}
//! decode optional attributes including context-specific tag
/*! /note default implementation stores attributes to be output in DEREncodeOptionalAttributes */
virtual void BERDecodeOptionalAttributes(BufferedTransformation &bt);
//! encode optional attributes including context-specific tag
virtual void DEREncodeOptionalAttributes(BufferedTransformation &bt) const;
private:
ByteQueue m_optionalAttributes;
};
// ********************************************************