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#include "../include/odhtdb/Signature.hpp"
#include "../include/odhtdb/Hash.hpp"
#include "../include/odhtdb/bin2hex.hpp"
#include <sodium/crypto_sign_ed25519.h>
#include <cstring>
using namespace std;
namespace odhtdb
{
namespace Signature
{
const PublicKey PublicKey::ZERO("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", PUBLIC_KEY_NUM_BYTES);
PublicKey::PublicKey()
{
memset(data, 0, PUBLIC_KEY_NUM_BYTES);
}
PublicKey::PublicKey(const char *_data, size_t size)
{
if(size != PUBLIC_KEY_NUM_BYTES)
{
string errMsg = "Expected public key size to be ";
errMsg += to_string(PUBLIC_KEY_NUM_BYTES);
errMsg += " bytes, was: ";
errMsg += to_string(size);
throw InvalidSignatureKeySize(errMsg);
}
memmove(data, _data, PUBLIC_KEY_NUM_BYTES);
}
PublicKey::PublicKey(const PublicKey &other)
{
memmove(data, other.data, PUBLIC_KEY_NUM_BYTES);
}
PublicKey& PublicKey::operator=(const PublicKey &other)
{
memmove(data, other.data, PUBLIC_KEY_NUM_BYTES);
return *this;
}
string PublicKey::unsign(const DataView &signedMessage) const
{
if(signedMessage.size < SIGNED_HASH_SIZE)
throw UnsignInvalidSizeException("Signed message is too small (corrupt or malicious signed message)");
string result;
result.resize(signedMessage.size - SIGNED_HASH_SIZE);
if(crypto_sign_ed25519_open((unsigned char*)&result[0], nullptr, (const unsigned char*)signedMessage.data, signedMessage.size, (unsigned char*)data) < 0)
throw UnsignWrongKeyException("Message was not signed with matching private key");
return result;
}
size_t PublicKey::operator()() const
{
return fnvHash((const unsigned char*)data, PUBLIC_KEY_NUM_BYTES);
}
bool PublicKey::operator==(const PublicKey &other) const
{
return memcmp(data, other.data, PUBLIC_KEY_NUM_BYTES) == 0;
}
bool PublicKey::operator!=(const PublicKey &other) const
{
return !operator==(other);
}
string PublicKey::toString() const
{
return bin2hex(data, PUBLIC_KEY_NUM_BYTES);
}
const PrivateKey PrivateKey::ZERO("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", PRIVATE_KEY_NUM_BYTES);
PrivateKey::PrivateKey()
{
memset(data, 0, PRIVATE_KEY_NUM_BYTES);
}
PrivateKey::PrivateKey(const char *_data, size_t size)
{
if(size != PRIVATE_KEY_NUM_BYTES)
{
string errMsg = "Expected private key size to be ";
errMsg += to_string(PRIVATE_KEY_NUM_BYTES);
errMsg += " bytes, was: ";
errMsg += to_string(size);
throw InvalidSignatureKeySize(errMsg);
}
memmove(data, _data, PRIVATE_KEY_NUM_BYTES);
}
PrivateKey::PrivateKey(const PrivateKey &other)
{
memmove(data, other.data, PRIVATE_KEY_NUM_BYTES);
}
PrivateKey& PrivateKey::operator=(const PrivateKey &other)
{
memmove(data, other.data, PRIVATE_KEY_NUM_BYTES);
return *this;
}
bool PrivateKey::operator==(const PrivateKey &other) const
{
return memcmp(data, other.data, PRIVATE_KEY_NUM_BYTES) == 0;
}
bool PrivateKey::operator!=(const PrivateKey &other) const
{
return !operator==(other);
}
string PrivateKey::sign(const DataView &dataToSign) const
{
string result;
result.resize(crypto_sign_ed25519_BYTES + dataToSign.size);
unsigned long long resultSize;
if(crypto_sign_ed25519((unsigned char*)&result[0], &resultSize, (unsigned char*)dataToSign.data, dataToSign.size, (unsigned char*)data) < 0)
throw DataSignException("Failed to sign data. Is private key invalid?");
if(resultSize != result.size())
throw DataSignException("Failed to sign data. The signed data is not of expected size (bug)");
return result;
}
string PrivateKey::toString() const
{
return bin2hex(data, PRIVATE_KEY_NUM_BYTES);
}
KeyPair::KeyPair()
{
if(crypto_sign_ed25519_keypair((unsigned char*)publicKey.data, (unsigned char*)privateKey.data) < 0)
throw SignatureGenerationException("Failed to generate signature keypair");
}
KeyPair::KeyPair(const PublicKey &_publicKey, const PrivateKey &_privateKey) :
publicKey(_publicKey),
privateKey(_privateKey)
{
}
KeyPair::KeyPair(const KeyPair &other)
{
memmove(publicKey.data, other.publicKey.data, PUBLIC_KEY_NUM_BYTES);
memmove(privateKey.data, other.privateKey.data, PRIVATE_KEY_NUM_BYTES);
}
}
}
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