openssl_rc4(3) - NetBSD Manual Pages

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rc4(3)                       OpenSSL                       rc4(3)



NAME

       RC4_set_key, RC4 - RC4 encryption


LIBRARY

       libcrypto, -lcrypto


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.  Typi-
       cally, 128 bit (16 byte) keys are used for strong encryp-
       tion, but shorter insecure key sizes have been widely used
       due to export restrictions.

       RC4 consists of a key setup phase and the actual encryp-
       tion 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), decryp-
       tion uses the same function calls as encryption.

       Applications should use the higher level functions
       EVP_EncryptInit(3) etc. instead of calling the RC4 func-
       tions 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.





2000-07-22                    0.9.6g                            1





rc4(3)                       OpenSSL                       rc4(3)



SEE ALSO

       openssl_blowfish(3), openssl_des(3), rc2(3)


HISTORY

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



















































2000-07-22                    0.9.6g                            2