1 files changed, 164 insertions, 0 deletions

diff --git a/src/Crypto.h b/src/Crypto.h
new file mode 100644
index 000000000..6b576f55b
--- /dev/null
+++ b/src/Crypto.h
@@ -0,0 +1,164 @@
+
+// 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;
+} ;
+
+
+
+