rc4(3)								      OpenSSL								    rc4(3)

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.

0.9.7d								    2002-04-30								    rc4(3)