XGitUrl: https://git.openssl.org/?p=openssl.git;a=blobdiff_plain;f=doc%2Fcrypto%2Fblowfish.pod;h=31438ab73aa0407547037fc7a888f86e28b1a4f9;hp=e8c7114311b5d634efd43e54de515c7e2c6c18ec;hb=46aa6078675132bce25c1d06878ae0fcc5f7cd55;hpb=d52c973498901e7cd6453ee1fcd75d7d770b0d3c
diff git a/doc/crypto/blowfish.pod b/doc/crypto/blowfish.pod
index e8c7114311..31438ab73a 100644
 a/doc/crypto/blowfish.pod
+++ b/doc/crypto/blowfish.pod
@@ 11,9 +11,6 @@ BF_cfb64_encrypt, BF_ofb64_encrypt, BF_options  Blowfish encryption
void BF_set_key(BF_KEY *key, int len, const unsigned char *data);
 void BF_encrypt(BF_LONG *data,const BF_KEY *key);
 void BF_decrypt(BF_LONG *data,const BF_KEY *key);

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,
@@ 25,14 +22,17 @@ BF_cfb64_encrypt, BF_ofb64_encrypt, BF_options  Blowfish encryption
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);
+
=head1 DESCRIPTION
This library implements the Blowfish cipher, which is invented and described
by Counterpane (see http://www.counterpane.com/blowfish/ ).
+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
+considered good for strong encryption. Blowfish can be used in the same
modes as DES (see L). Blowfish is currently one
of the faster block ciphers. It is quite a bit faster than DES, and much
faster than IDEA or RC2.
@@ 43,11 +43,6 @@ phase.
BF_set_key() sets up the B B using the B bytes long key
at B.
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
B, using the key B. These functions should not be used unless you
implement 'modes' of Blowfish.

BF_ecb_encrypt() is the basic Blowfish encryption and decryption function.
It encrypts or decrypts the first 64 bits of B using the key B,
putting the result in B. B decides if encryption (B)
@@ 56,34 +51,45 @@ B and B 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 initialisation vector
B which must be initially filled with zeros, but then just need to be
passed along into the next call of the same function for the same message.
BF_cbc_encrypt() operates of data that is a multiple of 8 bytes long, while
+all operate on variable length data. They all take an initialization vector
+B which needs to be passed along into the next call of the same function
+for the same message. B 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
+B 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 B, which is a pointer to an integer where the current
offset in B is stored between calls. This integer must be initialised
to zero when B is filled with zeros.
+offset in B is stored between calls. This integer must be initialized
+to zero when B is initialized.
BF_cbc_encrypt() is the Cipher Block Chaining function for Blowfish. It
encrypts or decrypts the 64 bits chunks of B using the key B,
putting the result in B. B decides if encryption (BF_ENCRYPT) or
decryption (BF_DECRYPT) shall be performed. B must point at an 8 byte
long initialisation vector, which must be initially filled with zeros.
+long initialization vector.
BF_cfb64_encrypt() is the CFB mode for Blowfish with 64 bit feedback.
It encrypts or decrypts the bytes in B using the key B,
putting the result in B. B decides if encryption (B)
or decryption (B) shall be performed. B must point at an
8 byte long initialisation vector, which must be initially filled with zeros.
B must point at an integer which must be initially zero.
+8 byte long initialization vector. B 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 initialised
+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
+B, using the key B. 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 32bit chunk in hostbyte order, which is littleendian on littleendian
+platforms and bigendian on bigendian ones.
+
=head1 RETURN VALUES
None of the functions presented here return any value.
@@ 91,16 +97,12 @@ None of the functions presented here return any value.
=head1 NOTE
Applications should use the higher level functions
L etc. instead of calling the
blowfish functions directly.
+L etc. instead of calling these
+functions directly.
=head1 SEE ALSO
+L,
L
=head1 HISTORY

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

=cut
