blob: 27992ca2decc003fdb01ea3465a16f74b1a63410 [file] [log] [blame]
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/**
* Copyright (C) 2013 Regents of the University of California.
* @author: Yingdi Yu <yingdi@cs.ucla.edu>
* @author: Jeff Thompson <jefft0@remap.ucla.edu>
* See COPYING for copyright and distribution information.
*/
#include "common.hpp"
#include "security/public-key.hpp"
#include <cryptopp/rsa.h>
#include <cryptopp/base64.h>
#include <cryptopp/files.h>
using namespace std;
using namespace CryptoPP;
namespace ndn {
static OID RSA_OID("1.2.840.113549.1.1.1");
PublicKey::PublicKey()
{
}
/**
* Create a new PublicKey with the given values.
* @param algorithm The algorithm of the public key.
* @param keyDer The blob of the PublicKeyInfo in terms of DER.
*/
PublicKey::PublicKey(const uint8_t *keyDerBuf, size_t keyDerSize)
{
StringSource src(keyDerBuf, keyDerSize, true);
decode(src);
}
void
PublicKey::encode(CryptoPP::BufferedTransformation &out) const
{
// SubjectPublicKeyInfo ::= SEQUENCE {
// algorithm AlgorithmIdentifier
// keybits BIT STRING }
out.Put(key_.buf(), key_.size());
}
void
PublicKey::decode(CryptoPP::BufferedTransformation &in)
{
// SubjectPublicKeyInfo ::= SEQUENCE {
// algorithm AlgorithmIdentifier
// keybits BIT STRING }
try {
std::string out;
StringSink sink(out);
////////////////////////
// part 1: copy as is //
////////////////////////
BERSequenceDecoder decoder(in);
{
assert (decoder.IsDefiniteLength());
DERSequenceEncoder encoder(sink);
decoder.TransferTo(encoder, decoder.RemainingLength());
encoder.MessageEnd();
}
decoder.MessageEnd();
////////////////////////
// part 2: check if the key is RSA (since it is the only supported for now)
////////////////////////
StringSource checkedSource(out, true);
BERSequenceDecoder subjectPublicKeyInfo(checkedSource);
{
BERSequenceDecoder algorithmInfo(subjectPublicKeyInfo);
{
OID algorithm;
algorithm.decode(algorithmInfo);
if (algorithm != RSA_OID)
throw Error("Only RSA public keys are supported for now (" + algorithm.toString() + " requested");
}
}
key_.assign(out.begin(), out.end());
}
catch (CryptoPP::BERDecodeErr &err) {
throw Error("PublicKey decoding error");
}
}
// Blob
// PublicKey::getDigest(DigestAlgorithm digestAlgorithm) const
// {
// if (digestAlgorithm == DIGEST_ALGORITHM_SHA256) {
// uint8_t digest[SHA256_DIGEST_LENGTH];
// ndn_digestSha256(keyDer_.buf(), keyDer_.size(), digest);
// return Blob(digest, sizeof(digest));
// }
// else
// throw UnrecognizedDigestAlgorithmException("Wrong format!");
// }
std::ostream &
operator <<(std::ostream &os, const PublicKey &key)
{
CryptoPP::StringSource(key.get().buf(), key.get().size(), true,
new CryptoPP::Base64Encoder(new CryptoPP::FileSink(os), true, 64));
return os;
}
}