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+.\" ======================================================================
+.\"
+.IX Title "RC4 1"
+.TH RC4 1 "perl v5.6.1" "2000-04-13" "User Contributed Perl Documentation"
+.UC
+.SH "NAME"
+RC4_set_key, \s-1RC4\s0 \- \s-1RC4\s0 encryption
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/rc4.h>
+.Ve
+.Vb 1
+\& void RC4_set_key(RC4_KEY *key, int len, const unsigned char *data);
+.Ve
+.Vb 2
+\& void RC4(RC4_KEY *key, unsigned long len, const unsigned char *indata,
+\&          unsigned char *outdata);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+This library implements the Alleged \s-1RC4\s0 cipher, which is described for
+example in \fIApplied Cryptography\fR.  It is believed to be compatible
+with RC4[\s-1TM\s0], a proprietary cipher of \s-1RSA\s0 Security Inc.
+.PP
+\&\s-1RC4\s0 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.
+.PP
+\&\s-1RC4\s0 consists of a key setup phase and the actual encryption or
+decryption phase.
+.PP
+\&\fIRC4_set_key()\fR sets up the \fB\s-1RC4_KEY\s0\fR \fBkey\fR using the \fBlen\fR bytes long
+key at \fBdata\fR.
+.PP
+\&\fIRC4()\fR encrypts or decrypts the \fBlen\fR bytes of data at \fBindata\fR using
+\&\fBkey\fR and places the result at \fBoutdata\fR.  Repeated \fIRC4()\fR calls with
+the same \fBkey\fR yield a continuous key stream.
+.PP
+Since \s-1RC4\s0 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.
+.PP
+Applications should use the higher level functions
+EVP_EncryptInit(3)
+etc. instead of calling the \s-1RC4\s0 functions directly.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fIRC4_set_key()\fR and \fIRC4()\fR do not return values.
+.SH "NOTE"
+.IX Header "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.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+blowfish(3), des(3), rc2(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+\&\fIRC4_set_key()\fR and \fIRC4()\fR are available in all versions of SSLeay and OpenSSL.