Update build for OpenSSL-0.9.8j upgrade.
[dragonfly.git] / secure / lib / libcrypto / man / rc4.3
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132.\" ========================================================================
133.\"
134.IX Title "rc4 3"
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135.TH rc4 3 "2009-01-11" "0.9.8j" "OpenSSL"
136.\" For nroff, turn off justification. Always turn off hyphenation; it makes
137.\" way too many mistakes in technical documents.
138.if n .ad l
139.nh
984263bc 140.SH "NAME"
74dab6c2 141RC4_set_key, RC4 \- RC4 encryption
984263bc 142.SH "SYNOPSIS"
8b0cefbb 143.IX Header "SYNOPSIS"
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144.Vb 1
145\& #include <openssl/rc4.h>
e257b235 146\&
984263bc 147\& void RC4_set_key(RC4_KEY *key, int len, const unsigned char *data);
e257b235 148\&
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149\& void RC4(RC4_KEY *key, unsigned long len, const unsigned char *indata,
150\& unsigned char *outdata);
151.Ve
152.SH "DESCRIPTION"
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153.IX Header "DESCRIPTION"
154This library implements the Alleged \s-1RC4\s0 cipher, which is described for
984263bc 155example in \fIApplied Cryptography\fR. It is believed to be compatible
8b0cefbb 156with RC4[\s-1TM\s0], a proprietary cipher of \s-1RSA\s0 Security Inc.
984263bc 157.PP
8b0cefbb 158\&\s-1RC4\s0 is a stream cipher with variable key length. Typically, 128 bit
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159(16 byte) keys are used for strong encryption, but shorter insecure
160key sizes have been widely used due to export restrictions.
161.PP
8b0cefbb 162\&\s-1RC4\s0 consists of a key setup phase and the actual encryption or
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163decryption phase.
164.PP
8b0cefbb 165\&\fIRC4_set_key()\fR sets up the \fB\s-1RC4_KEY\s0\fR \fBkey\fR using the \fBlen\fR bytes long
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166key at \fBdata\fR.
167.PP
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168\&\s-1\fIRC4\s0()\fR encrypts or decrypts the \fBlen\fR bytes of data at \fBindata\fR using
169\&\fBkey\fR and places the result at \fBoutdata\fR. Repeated \s-1\fIRC4\s0()\fR calls with
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170the same \fBkey\fR yield a continuous key stream.
171.PP
8b0cefbb 172Since \s-1RC4\s0 is a stream cipher (the input is XORed with a pseudo-random
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173key stream to produce the output), decryption uses the same function
174calls as encryption.
175.PP
176Applications should use the higher level functions
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177\&\fIEVP_EncryptInit\fR\|(3)
178etc. instead of calling the \s-1RC4\s0 functions directly.
984263bc 179.SH "RETURN VALUES"
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180.IX Header "RETURN VALUES"
181\&\fIRC4_set_key()\fR and \s-1\fIRC4\s0()\fR do not return values.
984263bc 182.SH "NOTE"
8b0cefbb 183.IX Header "NOTE"
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184Certain conditions have to be observed to securely use stream ciphers.
185It is not permissible to perform multiple encryptions using the same
186key stream.
187.SH "SEE ALSO"
74dab6c2 188.IX Header "SEE ALSO"
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189\&\fIblowfish\fR\|(3), \fIdes\fR\|(3), \fIrc2\fR\|(3)
190.SH "HISTORY"
984263bc 191.IX Header "HISTORY"
8b0cefbb 192\&\fIRC4_set_key()\fR and \s-1\fIRC4\s0()\fR are available in all versions of SSLeay and OpenSSL.