digest.hpp

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#ifndef NDNPH_KEYCHAIN_DIGEST_HPP
#define NDNPH_KEYCHAIN_DIGEST_HPP
 
#include "../port/timingsafe/port.hpp"
#include "helper.hpp"
#include "private-key.hpp"
#include "public-key.hpp"
 
namespace ndnph {
 
class DigestKey
  : public PrivateKey
  , public PublicKey {
public:
  static const DigestKey& get() {
    static DigestKey instance;
    return instance;
  }
 
  size_t getMaxSigLen() const final {
    return NDNPH_SHA256_LEN;
  }
 
  void updateSigInfo(SigInfo& sigInfo) const final {
    sigInfo.sigType = SigType::Sha256;
    sigInfo.name = Name();
  }
 
  ssize_t sign(std::initializer_list<tlv::Value> chunks, uint8_t* sig) const final {
    bool ok = detail::computeDigest(chunks, sig);
    return ok ? NDNPH_SHA256_LEN : -1;
  }
 
  bool matchSigInfo(const SigInfo& sigInfo) const final {
    return sigInfo.sigType == SigType::Sha256;
  }
 
  bool verify(std::initializer_list<tlv::Value> chunks, const uint8_t* sig,
              size_t sigLen) const final {
    uint8_t digest[NDNPH_SHA256_LEN];
    return detail::computeDigest(chunks, digest) &&
           port::TimingSafeEqual()(digest, NDNPH_SHA256_LEN, sig, sigLen);
  }
};
 
} // namespace ndnph
 
#endif // NDNPH_KEYCHAIN_DIGEST_HPP