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    Command:

    blowfish

    
           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 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.
    
           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
           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 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.
    
    
    

    1.0.1e 2013-02-11 blowfish(3)

    
    
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