BF_cfb64_encrypt man page on IRIX

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     /xlv3/openssl/0.9.7e-sgipl1/work/0.9.7e-sgipl1/openssl-
     0.9.7e/doc/crypto

     Page 1					    (printed 10/20/05)

     blowfish(3)	   21/Jan/2002 (0.9.7e)		   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 - Blowfish 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 a considered good for strong
	  encryption.  Blowfish can be used in the same modes as DES
	  (see des_modes(7)).  Blowfish is currently one of the faster
	  block ciphers.  It is quite a bit faster than DES, and much
	  faster than IDEA or RC2.

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

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

	  BF_ecb_encrypt() 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.
	  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.

     Page 1					    (printed 10/20/05)

     blowfish(3)	   21/Jan/2002 (0.9.7e)		   blowfish(3)

	  The mode functions BF_cbc_encrypt(), BF_cfb64_encrypt() and
	  BF_ofb64_encrypt() all operate on variable length data.
	  They all take an initialization vector ivec which needs to
	  be passed along into the next call of the same function for
	  the same message.  ivec may be initialized with anything,
	  but the recipient needs to know what it was initialized
	  with, or it won't be able to decrypt.	 Some programs and
	  protocols simplify this, like SSH, where ivec is simply
	  initialized to zero.	BF_cbc_encrypt() operates on data that
	  is a multiple of 8 bytes long, while BF_cfb64_encrypt() and
	  BF_ofb64_encrypt() are used to encrypt an 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.

	  BF_cbc_encrypt() 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.  enc
	  decides if encryption (BF_ENCRYPT) or decryption
	  (BF_DECRYPT) shall be performed.  ivec must point at an 8
	  byte long initialization vector.

	  BF_cfb64_encrypt() 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.  enc decides if
	  encryption (BF_ENCRYPT) or decryption (BF_DECRYPT) shall be
	  performed.  ivec must point at an 8 byte long initialization
	  vector. num must point at an integer which must be initially
	  zero.

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

	  BF_encrypt() and BF_decrypt() are the lowest level functions
	  for Blowfish encryption.  They encrypt/decrypt the first 64
	  bits of the vector pointed by data, using the key key.
	  These functions should not be used unless you implement
	  'modes' of Blowfish.	The alternative is to use
	  BF_ecb_encrypt().  If you still want to use these functions,
	  you should be aware that they take each 32-bit chunk in
	  host-byte order, which is little-endian on little-endian
	  platforms and big-endian on big-endian ones.

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

     NOTE
	  Applications should use the higher level functions

     Page 2					    (printed 10/20/05)

     blowfish(3)	   21/Jan/2002 (0.9.7e)		   blowfish(3)

	  EVP_EncryptInit(3) etc. instead of calling the blowfish
	  functions directly.

     SEE ALSO
	  des_modes(7)

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

     Page 3					    (printed 10/20/05)

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