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// RsaPrivateKey.h
// Declares the cRsaPrivateKey class representing a private key for RSA operations.
#pragma once
#include "CtrDrbgContext.h"
#include "mbedtls/rsa.h"
/** Encapsulates an RSA private key used in PKI cryptography */
class cRsaPrivateKey
{
friend class cSslContext;
public:
/** Creates a new empty object, the key is not assigned */
cRsaPrivateKey(void);
/** Deep-copies the key from a_Other */
cRsaPrivateKey(const cRsaPrivateKey & a_Other);
~cRsaPrivateKey();
/** Generates a new key within this object, with the specified size in bits.
Returns true on success, false on failure. */
bool Generate(unsigned a_KeySizeBits = 1024);
/** Returns the public key part encoded in ASN1 DER encoding */
AString GetPubKeyDER(void);
/** Decrypts the data using RSAES-PKCS#1 algorithm.
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 RSAES-PKCS#1 algorithm.
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);
protected:
/** The mbedTLS key context */
mbedtls_rsa_context m_Rsa;
/** The random generator used for generating the key and encryption / decryption */
cCtrDrbgContext m_CtrDrbg;
/** Returns the internal context ptr. Only use in mbedTLS API calls. */
mbedtls_rsa_context * GetInternal(void) { return &m_Rsa; }
} ;
typedef std::shared_ptr<cRsaPrivateKey> cRsaPrivateKeyPtr;
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