, int len
const unsigned char *data
, unsigned long len
const unsigned char *indata
unsigned char *outdata
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.
() sets up the
using the len
bytes long key at
() encrypts or decrypts the
bytes of data at
and places the result at
() calls with the same
yield a continuous key stream.
Since RC4 is a stream cipher (the input is XOR'ed with a pseudo-random key
stream to produce the output), decryption uses the same function calls as
() do not return values.
() appeared in SSLeay 0.4 or earlier and
have been available since OpenBSD 2.4
This cipher is broken and should no longer be used.