// CryptoKey.h
// Declares the cCryptoKey class representing a RSA public key in PolarSSL
#pragma once
#include "CtrDrbgContext.h"
#include "polarssl/pk.h"
class cCryptoKey
{
friend class cSslContext;
public:
/** Constructs an empty key instance. Before use, it needs to be filled by ParsePublic() or ParsePrivate() */
cCryptoKey(void);
/** Constructs the public key out of the DER- or PEM-encoded pubkey data */
cCryptoKey(const AString & a_PublicKeyData);
/** Constructs the private key out of the DER- or PEM-encoded privkey data, with the specified password.
If a_Password is empty, no password is assumed. */
cCryptoKey(const AString & a_PrivateKeyData, const AString & a_Password);
~cCryptoKey();
/** Decrypts the data using the stored public key
Both a_EncryptedData and a_DecryptedData must be at least <KeySizeBytes> bytes large.
Returns the number of bytes decrypted, or negative number for error. */
int Decrypt(const Byte * a_EncryptedData, size_t a_EncryptedLength, Byte * a_DecryptedData, size_t a_DecryptedMaxLength);
/** Encrypts the data using the stored public key
Both a_EncryptedData and a_DecryptedData must be at least <KeySizeBytes> bytes large.
Returns the number of bytes decrypted, or negative number for error. */
int Encrypt(const Byte * a_PlainData, size_t a_PlainLength, Byte * a_EncryptedData, size_t a_EncryptedMaxLength);
/** Parses the specified data into a public key representation.
The key can be DER- or PEM-encoded.
Returns 0 on success, PolarSSL error code on failure. */
int ParsePublic(const void * a_Data, size_t a_NumBytes);
/** Parses the specified data into a private key representation.
If a_Password is empty, no password is assumed.
The key can be DER- or PEM-encoded.
Returns 0 on success, PolarSSL error code on failure. */
int ParsePrivate(const void * a_Data, size_t a_NumBytes, const AString & a_Password);
/** Returns true if the contained key is valid. */
bool IsValid(void) const;
protected:
/** The PolarSSL representation of the key data */
pk_context m_Pk;
/** The random generator used in encryption and decryption */
cCtrDrbgContext m_CtrDrbg;
/** Returns the internal context ptr. Only use in PolarSSL API calls. */
pk_context * GetInternal(void) { return &m_Pk; }
} ;
typedef std::shared_ptr<cCryptoKey> cCryptoKeyPtr;
