rc4 man page on DigitalUNIX

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rc4(3)									rc4(3)

       rc4, RC4_set_key, RC4 - RC4 encryption

       #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 );

       This library implements the Alleged RC4 cipher, which is	 described  in
       Applied	Cryptography.	It  is	believed to be compatible with <trade‐
       mark>RC4</trademark>, 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  decryp‐
       tion phase.

       The  RC4_set_key() function sets up the RC4_KEY key using the len bytes
       long key at data.

       The RC4() function 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  instead of  calling
       the RC4 functions directly. (See EVP_EncryptInit(3).)

       Certain	conditions have to be observed to securely use stream ciphers.
       You cannot perform multiple encryptions using the same key stream.

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

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

       Functions: blowfish(3), des(3), rc2(3)


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