RC4_set_key.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" RC4_set_key, RC4 \- RC4 encryption .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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); .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 \&\fBRC4_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 \&\s-1\fBRC4\s0()\fR encrypts or decrypts the \fBlen\fR bytes of data at \fBindata\fR using \&\fBkey\fR and places the result at \fBoutdata\fR. Repeated \s-1\fBRC4\s0()\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 \&\fBEVP_EncryptInit\fR\|(3) etc. instead of calling the \s-1RC4\s0 functions directly. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBRC4_set_key()\fR and \s-1\fBRC4\s0()\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" \&\fBblowfish\fR\|(3), \fBdes\fR\|(3), \fBrc2\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBRC4_set_key()\fR and \s-1\fBRC4\s0()\fR are available in all versions of SSLeay and OpenSSL.
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