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-rw-r--r--src/Crypto.h198
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diff --git a/src/Crypto.h b/src/Crypto.h
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-
-// 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"
-#include "polarssl/pk.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);
-
- /** 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:
- 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);
-} ;
-
-
-
-
-
-class cPublicKey
-{
-public:
- cPublicKey(const AString & a_PublicKeyDER);
- ~cPublicKey();
-
- /** 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);
-
-protected:
- pk_context m_Pk;
- 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:
- 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;
-} ;
-
-
-
-