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141 .TH rc4 3 "0.9.7a" "2003-02-19" "OpenSSL"
144 RC4_set_key, \s-1RC4\s0 \- \s-1RC4\s0 encryption
146 .IX Header "SYNOPSIS"
148 \& #include <openssl/rc4.h>
151 \& void RC4_set_key(RC4_KEY *key, int len, const unsigned char *data);
154 \& void RC4(RC4_KEY *key, unsigned long len, const unsigned char *indata,
155 \& unsigned char *outdata);
158 .IX Header "DESCRIPTION"
159 This library implements the Alleged \s-1RC4\s0 cipher, which is described for
160 example in \fIApplied Cryptography\fR. It is believed to be compatible
161 with RC4[\s-1TM\s0], a proprietary cipher of \s-1RSA\s0 Security Inc.
163 \&\s-1RC4\s0 is a stream cipher with variable key length. Typically, 128 bit
164 (16 byte) keys are used for strong encryption, but shorter insecure
165 key sizes have been widely used due to export restrictions.
167 \&\s-1RC4\s0 consists of a key setup phase and the actual encryption or
170 \&\fIRC4_set_key()\fR sets up the \fB\s-1RC4_KEY\s0\fR \fBkey\fR using the \fBlen\fR bytes long
173 \&\fIRC4()\fR encrypts or decrypts the \fBlen\fR bytes of data at \fBindata\fR using
174 \&\fBkey\fR and places the result at \fBoutdata\fR. Repeated \fIRC4()\fR calls with
175 the same \fBkey\fR yield a continuous key stream.
177 Since \s-1RC4\s0 is a stream cipher (the input is XORed with a pseudo-random
178 key stream to produce the output), decryption uses the same function
181 Applications should use the higher level functions
183 etc. instead of calling the \s-1RC4\s0 functions directly.
185 .IX Header "RETURN VALUES"
186 \&\fIRC4_set_key()\fR and \fIRC4()\fR do not return values.
189 Certain conditions have to be observed to securely use stream ciphers.
190 It is not permissible to perform multiple encryptions using the same
193 .IX Header "SEE ALSO"
194 blowfish(3), des(3), rc2(3)
197 \&\fIRC4_set_key()\fR and \fIRC4()\fR are available in all versions of SSLeay and OpenSSL.