XrdCryptoLite_bf32 Class Reference

Inheritance diagram for XrdCryptoLite_bf32:

Collaboration diagram for XrdCryptoLite_bf32:

Public Member Functions
	XrdCryptoLite_bf32 (const char deType)
	~XrdCryptoLite_bf32 ()
virtual int	Decrypt (const char *key, int keyLen, const char *src, int srcLen, char *dst, int dstLen)
virtual int	Encrypt (const char *key, int keyLen, const char *src, int srcLen, char *dst, int dstLen)
Public Member Functions inherited from XrdCryptoLite
	XrdCryptoLite (char deType, int ovhd=8)
virtual	~XrdCryptoLite ()
virtual int	Overhead ()
virtual char	Type ()

Additional Inherited Members
Static Public Member Functions inherited from XrdCryptoLite
static XrdCryptoLite *	Create (int &rc, const char *Name, const char Type='\0')
Protected Attributes inherited from XrdCryptoLite
int	Extra
char	myType

Detailed Description

Definition at line 54 of file XrdCryptoLite_bf32.cc.

Constructor & Destructor Documentation

XrdCryptoLite_bf32()

XrdCryptoLite_bf32::XrdCryptoLite_bf32 ( const char  deType )

inline

Definition at line 72 of file XrdCryptoLite_bf32.cc.

: XrdCryptoLite(deType, 4) {}

~XrdCryptoLite_bf32()

XrdCryptoLite_bf32::~XrdCryptoLite_bf32 ( )

inline

Definition at line 73 of file XrdCryptoLite_bf32.cc.

{}

Member Function Documentation

Decrypt()

int XrdCryptoLite_bf32::Decrypt ( const char *  key, int  keyLen, const char *  src, int  srcLen, char *  dst, int  dstLen  )

virtual

Implements XrdCryptoLite.

Definition at line 80 of file XrdCryptoLite_bf32.cc.

{
   unsigned char ivec[8] = {0,0,0,0,0,0,0,0};
   unsigned int crc32;
   int wLen;
   int dLen = srcLen - sizeof(crc32);
 
// Make sure we have data
//
   if (dstLen <= (int)sizeof(crc32) || dstLen < srcLen) return -EINVAL;
 
// Decrypt
//
   EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
   EVP_DecryptInit_ex(ctx, EVP_bf_cfb64(), NULL, NULL, NULL);
   EVP_CIPHER_CTX_set_padding(ctx, 0);
   EVP_CIPHER_CTX_set_key_length(ctx, keyLen);
   EVP_DecryptInit_ex(ctx, NULL, NULL, (unsigned char *)key, ivec);
   EVP_DecryptUpdate(ctx, (unsigned char *)dst, &wLen,
                          (unsigned char *)src, srcLen);
   EVP_DecryptFinal_ex(ctx, (unsigned char *)dst, &wLen);
   EVP_CIPHER_CTX_free(ctx);
 
// Perform the CRC check to verify we have valid data here
//
   memcpy(&crc32, dst+dLen, sizeof(crc32));
   crc32 = ntohl(crc32);
   if (crc32 != XrdOucCRC::CRC32((const unsigned char *)dst, dLen))
      return -EPROTO;
 
// Return success
//
   return dLen;
}

References XrdOucCRC::CRC32().

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Encrypt()

int XrdCryptoLite_bf32::Encrypt ( const char *  key, int  keyLen, const char *  src, int  srcLen, char *  dst, int  dstLen  )

virtual

Implements XrdCryptoLite.

Definition at line 124 of file XrdCryptoLite_bf32.cc.

{
   unsigned char buff[4096], *bP, *mP = 0, ivec[8] = {0,0,0,0,0,0,0,0};
   unsigned int crc32;
   int wLen;
   int dLen = srcLen + sizeof(crc32);
 
// Make sure that the destination if at least 4 bytes larger and we have data
//
   if (dstLen-srcLen < (int)sizeof(crc32) || srcLen <= 0) return -EINVAL;
 
// Normally, the msg is 4k or less but if more, get a new buffer
//
   if (dLen <= (int)sizeof(buff)) bP = buff;
      else {if (!(mP = (unsigned char *)malloc(dLen))) return -ENOMEM;
               else bP = mP;
           }
 
// Append a crc
//
   memcpy(bP, src, srcLen);
   crc32 = XrdOucCRC::CRC32(bP, srcLen);
   crc32 = htonl(crc32);
   memcpy((bP+srcLen), &crc32, sizeof(crc32));
 
// Encrypt
//
   EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
   EVP_EncryptInit_ex(ctx, EVP_bf_cfb64(), NULL, NULL, NULL);
   EVP_CIPHER_CTX_set_padding(ctx, 0);
   EVP_CIPHER_CTX_set_key_length(ctx, keyLen);
   EVP_EncryptInit_ex(ctx, NULL, NULL, (unsigned char *)key, ivec);
   EVP_EncryptUpdate(ctx, (unsigned char *)dst, &wLen, bP, dLen);
   EVP_EncryptFinal_ex(ctx, (unsigned char *)dst, &wLen);
   EVP_CIPHER_CTX_free(ctx);
 
// Free temp buffer and return success
//
   if (mP) free(mP);
   return dLen;
}

References XrdOucCRC::CRC32().

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The documentation for this class was generated from the following file:

• XrdCryptoLite_bf32.cc