BF_ofb64_encrypt man page on OSF1

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blowfish(3)							   blowfish(3)

NAME
       blowfish,    BF_set_key,	   BF_encrypt,	 BF_decrypt,   BF_ecb_encrypt,
       BF_cbc_encrypt, BF_cfb64_encrypt, BF_ofb64_encrypt, BF_options -	 Blow‐
       fish encryption

SYNOPSIS
       #include <openssl/blowfish.h>

       void BF_set_key(
	       BF_KEY  *key,  int  len,	 const	unsigned  char	*data  ); void
       BF_ecb_encrypt(
	       const unsigned char *in, unsigned char  *out,		BF_KEY
       *key, int enc ); void BF_cbc_encrypt(
	       const  unsigned	char  *in,  unsigned  char  *out,	  long
       length,	BF_KEY	*schedule,  unsigned  char  *ivec,  int	 enc  );  void
       BF_cfb64_encrypt(
	       const  unsigned	char  *in,  unsigned  char  *out,	  long
       length, BF_KEY *schedule, unsigned char *ivec, int *num,		   int
       enc ); void BF_ofb64_encrypt(
	       const  unsigned	char  *in,  unsigned  char  *out,	  long
       length, BF_KEY *schedule, unsigned char *ivec, int *num );  const  char
       *BF_options(
	       void ); void BF_encrypt(
	       BF_LONG *data,const BF_KEY *key ); void BF_decrypt(
	       BF_LONG *data,const BF_KEY *key );

DESCRIPTION
       This  library  implements  the  Blowfish cipher, which was invented and
       described by Counterpane. See http://www.counterpane.com/blowfish.html.

       Blowfish is a block cipher that operates on 64-bit (8 byte)  blocks  of
       data.  It  uses	a  variable size key, but typically, 128-bit (16 byte)
       keys are considered good for strong encryption.	Blowfish can  be  used
       in  the	same  modes  as DES. See des_modes(7).	Blowfish is one of the
       faster block ciphers.  It is faster than DES, and much faster than IDEA
       or RC2.

       Blowfish	 consists  of  a  key setup phase and the actual encryption or
       decryption phase.

       The BF_set_key() function sets up the BF_KEY key using  the  len	 bytes
       long key at data.

       The  BF_ecb_encrypt()  function	is  the	 basic Blowfish encryption and
       decryption function. It encrypts or decrypts the first 64  bits	of  in
       using  the  key	key,  putting  the  result in out.  The enc decides if
       encryption (BF_ENCRYPT) or decryption (BF_DECRYPT) shall be  performed.
       The vector pointed at by in and out must be 64 bits in length, no less.
       If they are larger, everything after the first 64 bits is ignored.

       The BF_cbc_encrypt(), BF_cfb64_encrypt(), and  BF_ofb64_encrypt()  mode
       functions  all  operate on variable length data.	 They all take an ini‐
       tialization vector ivec which needs to be passed along  into  the  next
       call  of the same function  for the same message.  The ivec may be ini‐
       tialized with anything, but the recipient needs to know what was	 used,
       or  it  won't be able to decrypt.  Some programs and protocols simplify
       this. For example, ivec is simply  initialized  to  zero	 in  SSH.  The
       BF_cbc_encrypt()	 function  operates  of	 data  that is a multiple of 8
       bytes long, while the BF_cfb64_encrypt() and  BF_ofb64_encrypt()	 func‐
       tions  are  used to encrypt a variable number of bytes (the amount does
       not have to be an exact multiple of 8).	The purpose of the latter  two
       is  to  simulate stream ciphers, and therefore, they need the parameter
       num, which is a pointer to an integer where the current offset in  ivec
       is stored between calls.	 This integer must be initialized to zero when
       ivec is initialized.

       The BF_cbc_encrypt() function is the Cipher Block Chaining function for
       Blowfish.   It  encrypts or decrypts the 64 bits chunks of in using the
       key schedule, putting the result in out.	 The enc decides if encryption
       (BF_ENCRYPT)  or	 decryption (BF_DECRYPT) shall be performed.  The ivec
       must point at an 8 byte long initialization vector.

       The BF_cfb64_encrypt() function is  the	CFB  mode  for	Blowfish  with
       64-bit  feedback. It encrypts or decrypts the bytes in in using the key
       schedule, putting the result in out.  The  enc  decides	if  encryption
       (BF_ENCRYPT)  or	 decryption (BF_DECRYPT) shall be performed.  The ivec
       must point at an 8 byte long initialization vector. The num must	 point
       at an integer which must be initially zero.

       The  BF_ofb64_encrypt()	function  is  the  OFB	mode for Blowfish with
       64-bit feedback. It uses the same parameters as the  BF_cfb64_encrypt()
       function, which must be initialized the same way.

       The  BF_encrypt() and BF_decrypt() functions are the lowest level func‐
       tions for Blowfish encryption.  They encrypt or decrypt	the  first  64
       bits  of the vector pointed by data, using the key key.	They also take
       each 32-bit chunk in host-byte order, which is little-endian on little-
       endian  platforms  and  big-endian on big-endian platforms. These func‐
       tions should not be used unless you implement modes of  Blowfish.   The
       alternative is to use the BF_ecb_encrypt() function.

NOTES
       Applications should use the higher level functions, such as EVP_Encryp‐
       tInit(), instead of calling the blowfish functions directly.

RETURN VALUES
       None of the functions presented here return any value.

HISTORY
       The blowfish functions are available in	all  versions  of  SSLeay  and
       OpenSSL.

SEE ALSO
       Files: des_modes(7)

								   blowfish(3)
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