Manual Pages for UNIX Operating System command usage for man RC4_set_key

OpenSSL                                             rc4(3openssl)



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     RC4_set_key, RC4 - RC4 encryption

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      #include 

      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);


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     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 RRRRCCCC4444_KKKKEEEEYYYY kkkkeeeeyyyy using the lllleeeennnn bytes
     long key at ddddaaaattttaaaa.

     RC4() encrypts or decrypts the lllleeeennnn bytes of data at iiiinnnnddddaaaattttaaaa
     using kkkkeeeeyyyy and places the result at oooouuuuttttddddaaaattttaaaa.  Repeated RC4()
     calls with the same kkkkeeeeyyyy 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.

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

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

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




25/Feb/2000            Last change: 0.9.8o                      1






OpenSSL                                             rc4(3openssl)



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




















































25/Feb/2000            Last change: 0.9.8o                      2