190 lines
5.8 KiB
Groff
190 lines
5.8 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "rc4 3"
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.TH rc4 3 "2017-05-25" "1.0.2l" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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RC4_set_key, RC4 \- RC4 encryption
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/rc4.h>
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\&
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\& void RC4_set_key(RC4_KEY *key, int len, const unsigned char *data);
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\&
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\& void RC4(RC4_KEY *key, unsigned long len, const unsigned char *indata,
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\& unsigned char *outdata);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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This library implements the Alleged \s-1RC4\s0 cipher, which is described for
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example in \fIApplied Cryptography\fR. It is believed to be compatible
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with RC4[\s-1TM\s0], a proprietary cipher of \s-1RSA\s0 Security Inc.
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.PP
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\&\s-1RC4\s0 is a stream cipher with variable key length. Typically, 128 bit
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(16 byte) keys are used for strong encryption, but shorter insecure
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key sizes have been widely used due to export restrictions.
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.PP
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\&\s-1RC4\s0 consists of a key setup phase and the actual encryption or
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decryption phase.
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.PP
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\&\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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key at \fBdata\fR.
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.PP
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\&\s-1\fIRC4\s0()\fR encrypts or decrypts the \fBlen\fR bytes of data at \fBindata\fR using
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\&\fBkey\fR and places the result at \fBoutdata\fR. Repeated \s-1\fIRC4\s0()\fR calls with
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the same \fBkey\fR yield a continuous key stream.
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.PP
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Since \s-1RC4\s0 is a stream cipher (the input is XORed with a pseudo-random
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key stream to produce the output), decryption uses the same function
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calls as encryption.
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.PP
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Applications should use the higher level functions
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\&\fIEVP_EncryptInit\fR\|(3)
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etc. instead of calling the \s-1RC4\s0 functions directly.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIRC4_set_key()\fR and \s-1\fIRC4\s0()\fR do not return values.
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.SH "NOTE"
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.IX Header "NOTE"
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Certain conditions have to be observed to securely use stream ciphers.
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It is not permissible to perform multiple encryptions using the same
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key stream.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIblowfish\fR\|(3), \fIdes\fR\|(3), \fIrc2\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIRC4_set_key()\fR and \s-1\fIRC4\s0()\fR are available in all versions of SSLeay and OpenSSL.
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