Commit 521738e9 authored by Ԝеѕ's avatar Ԝеѕ Committed by Dr. Matthias St. Pierre
Browse files

Cleanup typos and grammar in DES_random_key.pod 



CLA: trivial

Reviewed-by: default avatarPaul Dale <paul.dale@oracle.com>
Reviewed-by: default avatarMatthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/7356)

(cherry picked from commit 4fef4981f8cc614559b86a06532b0eeac6ffd0d9)
parent e9a4fb49

doc/man3/DES_random_key.pod

+14 −14
Original line number Diff line number Diff line
@@ -99,7 +99,7 @@ algorithm. 


There are two phases to the use of DES encryption.  The first is the

generation of a I<DES_key_schedule> from a key, the second is the

actual encryption.  A DES key is of type I<DES_cblock>. This type is

actual encryption.  A DES key is of type I<DES_cblock>. This type

consists of 8 bytes with odd parity.  The least significant bit in

each byte is the parity bit.  The key schedule is an expanded form of

the key; it is used to speed the encryption process.
@@ -170,42 +170,42 @@ of 24 bytes. This is much better than CBC DES. 


DES_ede3_cbc_encrypt() implements outer triple CBC DES encryption with

three keys. This means that each DES operation inside the CBC mode is

an C<C=E(ks3,D(ks2,E(ks1,M)))>.  This mode is used by SSL.

C<C=E(ks3,D(ks2,E(ks1,M)))>.  This mode is used by SSL.



The DES_ede2_cbc_encrypt() macro implements two-key Triple-DES by

reusing I<ks1> for the final encryption.  C<C=E(ks1,D(ks2,E(ks1,M)))>.

This form of Triple-DES is used by the RSAREF library.



DES_pcbc_encrypt() encrypt/decrypts using the propagating cipher block

DES_pcbc_encrypt() encrypts/decrypts using the propagating cipher block

chaining mode used by Kerberos v4. Its parameters are the same as

DES_ncbc_encrypt().



DES_cfb_encrypt() encrypt/decrypts using cipher feedback mode.  This

method takes an array of characters as input and outputs and array of

DES_cfb_encrypt() encrypts/decrypts using cipher feedback mode.  This

method takes an array of characters as input and outputs an array of

characters.  It does not require any padding to 8 character groups.

Note: the I<ivec> variable is changed and the new changed value needs to

be passed to the next call to this function.  Since this function runs

a complete DES ECB encryption per I<numbits>, this function is only

suggested for use when sending small numbers of characters.

suggested for use when sending a small number of characters.



DES_cfb64_encrypt()

implements CFB mode of DES with 64bit feedback.  Why is this

implements CFB mode of DES with 64-bit feedback.  Why is this

useful you ask?  Because this routine will allow you to encrypt an

arbitrary number of bytes, no 8 byte padding.  Each call to this

arbitrary number of bytes, without 8 byte padding.  Each call to this

routine will encrypt the input bytes to output and then update ivec

and num.  num contains 'how far' we are though ivec.  If this does

not make much sense, read more about cfb mode of DES :-).

not make much sense, read more about CFB mode of DES.



DES_ede3_cfb64_encrypt() and DES_ede2_cfb64_encrypt() is the same as

DES_cfb64_encrypt() except that Triple-DES is used.



DES_ofb_encrypt() encrypts using output feedback mode.  This method

takes an array of characters as input and outputs and array of

takes an array of characters as input and outputs an array of

characters.  It does not require any padding to 8 character groups.

Note: the I<ivec> variable is changed and the new changed value needs to

be passed to the next call to this function.  Since this function runs

a complete DES ECB encryption per numbits, this function is only

suggested for use when sending small numbers of characters.

a complete DES ECB encryption per I<numbits>, this function is only

suggested for use when sending a small number of characters.



DES_ofb64_encrypt() is the same as DES_cfb64_encrypt() using Output

Feed Back mode.
@@ -232,10 +232,10 @@ The following are DES-based transformations: 


DES_fcrypt() is a fast version of the Unix crypt(3) function.  This

version takes only a small amount of space relative to other fast

crypt() implementations.  This is different to the normal crypt in

crypt() implementations.  This is different to the normal crypt() in

that the third parameter is the buffer that the return value is

written into.  It needs to be at least 14 bytes long.  This function

is thread safe, unlike the normal crypt.

is thread safe, unlike the normal crypt().



DES_crypt() is a faster replacement for the normal system crypt().

This function calls DES_fcrypt() with a static array passed as the