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rc4 (3)
  • >> rc4 (3) ( Solaris man: Библиотечные вызовы )
  • rc4 (3) ( Linux man: Библиотечные вызовы )
  • 
    
    

    NAME

         RC4_set_key, RC4 - RC4 encryption
    
    
    

    SYNOPSIS

          #include <openssl/rc4.h>
    
          void RC4_set_key(RC4_KEY *key, int len, const unsigned char *data);
    
          void RC4(RC4_KEY *key, unsigned long len, const unsigned char *indata,
                   unsigned char *outdata);
    
    
    
    

    DESCRIPTION

         This library implements the Alleged RC4 cipher, which is
         described for example in Applied Cryptography.  It is
         believed to be compatible with RC4[TM], a proprietary cipher
         of RSA Security Inc.
    
         RC4 is a stream cipher with variable key length.  Typically,
         128 bit (16 byte) keys are used for strong encryption, but
         shorter insecure key sizes have been widely used due to
         export restrictions.
    
         RC4 consists of a key setup phase and the actual encryption
         or decryption phase.
    
         RC4_set_key() sets up the RC4_KEY key using the len bytes
         long key at data.
    
         RC4() encrypts or decrypts the len bytes of data at indata
         using key and places the result at outdata.  Repeated RC4()
         calls with the same key yield a continuous key stream.
    
         Since RC4 is a stream cipher (the input is XORed with a
         pseudo-random key stream to produce the output), decryption
         uses the same function calls as encryption.
    
         Applications should use the higher level functions
         EVP_EncryptInit(3) etc. instead of calling the RC4 functions
         directly.
    
    
    

    RETURN VALUES

         RC4_set_key() and RC4() do not return values.
    
    
    

    NOTE

         Certain conditions have to be observed to securely use
         stream ciphers.  It is not permissible to perform multiple
         encryptions using the same key stream.
    
    
    

    SEE ALSO

         blowfish(3), des(3), rc2(3)
    
    
    

    HISTORY

         RC4_set_key() and RC4() are available in all versions of
         SSLeay and OpenSSL.
    
    
    
    


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