Sortix nightly manual
This manual documents Sortix nightly, a development build that has not been officially released. You can instead view this document in the latest official manual.
RC4(3) | Library Functions Manual | 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 XOR'ed with a pseudo-random key
stream to produce the output), decryption uses the same function calls as
encryption.
SEE ALSO
blowfish(3), EVP_EncryptInit(3), EVP_rc4(3)HISTORY
RC4_set_key
() and
RC4
() appeared in SSLeay 0.4 or earlier and
have been available since OpenBSD 2.4.
BUGS
This cipher is broken and should no longer be used.March 29, 2020 | Debian |