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add base 32 (Frank Palazzolo)

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weidai 2003-07-18 04:34:12 +00:00
parent 8f7315b910
commit b3d4024665
2 changed files with 77 additions and 0 deletions
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39
base32.cpp Normal file
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// base32.cpp - written and placed in the public domain by Frank Palazzolo, based on hex.cpp by Wei Dai
#include "pch.h"
#include "base32.h"
NAMESPACE_BEGIN(CryptoPP)
static const byte s_vecUpper[] = "ABCDEFGHIJKMNPQRSTUVWXYZ23456789";
static const byte s_vecLower[] = "abcdefghijkmnpqrstuvwxyz23456789";
void Base32Encoder::IsolatedInitialize(const NameValuePairs &parameters)
{
bool uppercase = parameters.GetValueWithDefault(Name::Uppercase(), true);
m_filter->Initialize(CombinedNameValuePairs(
parameters,
MakeParameters(Name::EncodingLookupArray(), uppercase ? &s_vecUpper[0] : &s_vecLower[0], false)(Name::Log2Base(), 5, true)));
}
void Base32Decoder::IsolatedInitialize(const NameValuePairs &parameters)
{
BaseN_Decoder::Initialize(CombinedNameValuePairs(
parameters,
MakeParameters(Name::DecodingLookupArray(), GetDefaultDecodingLookupArray(), false)(Name::Log2Base(), 5, true)));
}
const int *Base32Decoder::GetDefaultDecodingLookupArray()
{
static bool s_initialized = false;
static int s_array[256];
if (!s_initialized)
{
InitializeDecodingLookupArray(s_array, s_vecUpper, 32, true);
s_initialized = true;
}
return s_array;
}
NAMESPACE_END

38
base32.h Normal file
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#ifndef CRYPTOPP_BASE32_H
#define CRYPTOPP_BASE32_H
#include "basecode.h"
NAMESPACE_BEGIN(CryptoPP)
//! Converts given data to base 32, the default code is based on draft-ietf-idn-dude-02.txt
/*! To specify alternative code, call Initialize() with EncodingLookupArray parameter. */
class Base32Encoder : public SimpleProxyFilter
{
public:
Base32Encoder(BufferedTransformation *attachment = NULL, bool uppercase = true, int outputGroupSize = 0, const std::string &separator = ":", const std::string &terminator = "")
: SimpleProxyFilter(new BaseN_Encoder(new Grouper), attachment)
{
IsolatedInitialize(MakeParameters(Name::Uppercase(), uppercase)(Name::GroupSize(), outputGroupSize)(Name::Separator(), ConstByteArrayParameter(separator)));
}
void IsolatedInitialize(const NameValuePairs &parameters);
};
//! Decode base 32 data back to bytes, the default code is based on draft-ietf-idn-dude-02.txt
/*! To specify alternative code, call Initialize() with DecodingLookupArray parameter. */
class Base32Decoder : public BaseN_Decoder
{
public:
Base32Decoder(BufferedTransformation *attachment = NULL)
: BaseN_Decoder(GetDefaultDecodingLookupArray(), 5, attachment) {}
void IsolatedInitialize(const NameValuePairs &parameters);
private:
static const int *GetDefaultDecodingLookupArray();
};
NAMESPACE_END
#endif