asn.h

各种加密算法的集合

#ifndef CRYPTOPP_ASN_H 
#define CRYPTOPP_ASN_H 
 
#include "cryptlib.h" 
#include "queue.h" 
 
NAMESPACE_BEGIN(CryptoPP) 
 
// NOTE: these tags and flags are NOT COMPLETE! 
enum ASNTag {INTEGER=0x02, BIT_STRING=0x03, SEQUENCE=0x10}; 
enum ASNIdFlag {CONSTRUCTED = 0x20}; 
 
unsigned int DERLengthEncode(unsigned int length, byte *output); 
unsigned int DERLengthEncode(unsigned int length, BufferedTransformation &); 
 
#define BERDecodeError() throw BERDecodeErr() 
 
class BERDecodeErr : public Exception {public: BERDecodeErr() : Exception("BER decode error") {}}; 
 
bool BERLengthDecode(BufferedTransformation &, unsigned int &); 
 
class BERSequenceDecoder : public BufferedTransformation 
{ 
public: 
	BERSequenceDecoder(BufferedTransformation &inQueue); 
	~BERSequenceDecoder(); 
 
	void Put(byte) {} 
	void Put(const byte *, unsigned int) {} 
 
	unsigned long MaxRetrieveable() 
		{return inQueue.MaxRetrieveable();} 
	unsigned int Get(byte &outByte) 
		{return inQueue.Get(outByte);} 
	unsigned int Get(byte *outString, unsigned int getMax) 
		{return inQueue.Get(outString, getMax);} 
	unsigned int Peek(byte &outByte) const 
		{return inQueue.Peek(outByte);} 
 
private: 
	BufferedTransformation &inQueue; 
	bool definiteLength; 
	unsigned int length; 
}; 
 
class DERSequenceEncoder : public ByteQueue 
{ 
public: 
	DERSequenceEncoder(BufferedTransformation &outQueue); 
	~DERSequenceEncoder(); 
private: 
	BufferedTransformation &outQueue; 
}; 
 
NAMESPACE_END 
 
#endif