// Crypto.h
// Declares classes that wrap the cryptographic code library
#pragma once
#include "polarssl/rsa.h"
#include "polarssl/aes.h"
#include "polarssl/entropy.h"
#include "polarssl/ctr_drbg.h"
#include "polarssl/sha1.h"
/** Encapsulates an RSA private key used in PKI cryptography */
class cRSAPrivateKey
{
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);
protected:
rsa_context m_Rsa;
entropy_context m_Entropy;
ctr_drbg_context m_Ctr_drbg;
/** Initializes the m_Entropy and m_Ctr_drbg contexts
Common part of this object's construction, called from all constructors. */
void InitRnd(void);
} ;
/** Decrypts data using the AES / CFB (128) algorithm */
class cAESCFBDecryptor
{
public:
Byte test;
cAESCFBDecryptor(void);
~cAESCFBDecryptor();
/** Initializes the decryptor with the specified Key / IV */
void Init(const Byte a_Key[16], const Byte a_IV[16]);
/** Decrypts a_Length bytes of the encrypted data; produces a_Length output bytes */
void ProcessData(Byte * a_DecryptedOut, const Byte * a_EncryptedIn, size_t a_Length);
/** Returns true if the object has been initialized with the Key / IV */
bool IsValid(void) const { return m_IsValid; }
protected:
aes_context m_Aes;
/** The InitialVector, used by the CFB mode decryption */
Byte m_IV[16];
/** Current offset in the m_IV, used by the CFB mode decryption */
size_t m_IVOffset;
/** Indicates whether the object has been initialized with the Key / IV */
bool m_IsValid;
} ;
/** Encrypts data using the AES / CFB (128) algorithm */
class cAESCFBEncryptor
{
public:
Byte test;
cAESCFBEncryptor(void);
~cAESCFBEncryptor();
/** Initializes the decryptor with the specified Key / IV */
void Init(const Byte a_Key[16], const Byte a_IV[16]);
/** Encrypts a_Length bytes of the plain data; produces a_Length output bytes */
void ProcessData(Byte * a_EncryptedOut, const Byte * a_PlainIn, size_t a_Length);
/** Returns true if the object has been initialized with the Key / IV */
bool IsValid(void) const { return m_IsValid; }
protected:
aes_context m_Aes;
/** The InitialVector, used by the CFB mode encryption */
Byte m_IV[16];
/** Current offset in the m_IV, used by the CFB mode encryption */
size_t m_IVOffset;
/** Indicates whether the object has been initialized with the Key / IV */
bool m_IsValid;
} ;
/** Calculates a SHA1 checksum for data stream */
class cSHA1Checksum
{
public:
typedef Byte Checksum[20]; // The type used for storing the checksum
cSHA1Checksum(void);
/** Adds the specified data to the checksum */
void Update(const Byte * a_Data, size_t a_Length);
/** Calculates and returns the final checksum */
void Finalize(Checksum & a_Output);
/** Returns true if the object is accepts more input data, false if Finalize()-d (need to Restart()) */
bool DoesAcceptInput(void) const { return m_DoesAcceptInput; }
/** Converts a raw 160-bit SHA1 digest into a Java Hex representation
According to http://wiki.vg/wiki/index.php?title=Protocol_Encryption&oldid=2802
*/
static void DigestToJava(const Checksum & a_Digest, AString & a_JavaOut);
/** Clears the current context and start a new checksum calculation */
void Restart(void);
protected:
/** True if the object is accepts more input data, false if Finalize()-d (need to Restart()) */
bool m_DoesAcceptInput;
sha1_context m_Sha1;
} ;
