12-15-2008
Try to run this with an unecrypted file and see if there are problems.
Maybe that's why it's just happening once a while.
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LEARN ABOUT OPENSOLARIS
rc4
rc4(3openssl) OpenSSL rc4(3openssl)
NAME
RC4_set_key, RC4 - RC4 encryption
SYNOPSIS
#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);
DESCRIPTION
This library implements the Alleged RC4 cipher, which is described for example in Applied Cryptography. It is believed to be compatible
with RC4[TM], a proprietary cipher of RSA Security Inc.
RC4 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.
RC4 consists of a key setup phase and the actual encryption or decryption phase.
RC4_set_key() sets up the RC4_KEY key using the len bytes long key at data.
RC4() encrypts or decrypts the len bytes of data at indata using key and places the result at outdata. Repeated RC4() calls with the same
key yield a continuous key stream.
Since RC4 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.
Applications should use the higher level functions EVP_EncryptInit(3) etc. instead of calling the RC4 functions directly.
RETURN VALUES
RC4_set_key() and RC4() do not return values.
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.
SEE ALSO
blowfish(3), des(3), rc2(3)
HISTORY
RC4_set_key() and RC4() are available in all versions of SSLeay and OpenSSL.
OpenSSL-0.9.8 Oct 11 2005 rc4(3openssl)