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+=pod
+
+=head1 NAME
+
+des_random_key, des_set_key, des_key_sched, des_set_key_checked,
+des_set_key_unchecked, des_set_odd_parity, des_is_weak_key,
+des_ecb_encrypt, des_ecb2_encrypt, des_ecb3_encrypt, des_ncbc_encrypt,
+des_cfb_encrypt, des_ofb_encrypt, des_pcbc_encrypt, des_cfb64_encrypt,
+des_ofb64_encrypt, des_xcbc_encrypt, des_ede2_cbc_encrypt,
+des_ede2_cfb64_encrypt, des_ede2_ofb64_encrypt, des_ede3_cbc_encrypt,
+des_ede3_cbcm_encrypt, des_ede3_cfb64_encrypt, des_ede3_ofb64_encrypt,
+des_read_password, des_read_2passwords, des_read_pw_string,
+des_cbc_cksum, des_quad_cksum, des_string_to_key, des_string_to_2keys,
+des_fcrypt, des_crypt, des_enc_read, des_enc_write - DES encryption
+
+=head1 SYNOPSIS
+
+ #include <openssl/des.h>
+
+ void des_random_key(des_cblock *ret);
+
+ int des_set_key(const_des_cblock *key, des_key_schedule schedule);
+ int des_key_sched(const_des_cblock *key, des_key_schedule schedule);
+ int des_set_key_checked(const_des_cblock *key,
+        des_key_schedule schedule);
+ void des_set_key_unchecked(const_des_cblock *key,
+        des_key_schedule schedule);
+
+ void des_set_odd_parity(des_cblock *key);
+ int des_is_weak_key(const_des_cblock *key);
+
+ void des_ecb_encrypt(const_des_cblock *input, des_cblock *output, 
+        des_key_schedule ks, int enc);
+ void des_ecb2_encrypt(const_des_cblock *input, des_cblock *output, 
+        des_key_schedule ks1, des_key_schedule ks2, int enc);
+ void des_ecb3_encrypt(const_des_cblock *input, des_cblock *output, 
+        des_key_schedule ks1, des_key_schedule ks2, 
+        des_key_schedule ks3, int enc);
+
+ void des_ncbc_encrypt(const unsigned char *input, unsigned char *output, 
+        long length, des_key_schedule schedule, des_cblock *ivec, 
+        int enc);
+ void des_cfb_encrypt(const unsigned char *in, unsigned char *out,
+        int numbits, long length, des_key_schedule schedule,
+        des_cblock *ivec, int enc);
+ void des_ofb_encrypt(const unsigned char *in, unsigned char *out,
+        int numbits, long length, des_key_schedule schedule,
+        des_cblock *ivec);
+ void des_pcbc_encrypt(const unsigned char *input, unsigned char *output, 
+        long length, des_key_schedule schedule, des_cblock *ivec, 
+        int enc);
+ void des_cfb64_encrypt(const unsigned char *in, unsigned char *out,
+        long length, des_key_schedule schedule, des_cblock *ivec,
+        int *num, int enc);
+ void des_ofb64_encrypt(const unsigned char *in, unsigned char *out,
+        long length, des_key_schedule schedule, des_cblock *ivec,
+        int *num);
+
+ void des_xcbc_encrypt(const unsigned char *input, unsigned char *output, 
+        long length, des_key_schedule schedule, des_cblock *ivec, 
+        const_des_cblock *inw, const_des_cblock *outw, int enc);
+
+ void des_ede2_cbc_encrypt(const unsigned char *input,
+        unsigned char *output, long length, des_key_schedule ks1,
+        des_key_schedule ks2, des_cblock *ivec, int enc);
+ void des_ede2_cfb64_encrypt(const unsigned char *in,
+        unsigned char *out, long length, des_key_schedule ks1,
+        des_key_schedule ks2, des_cblock *ivec, int *num, int enc);
+ void des_ede2_ofb64_encrypt(const unsigned char *in,
+        unsigned char *out, long length, des_key_schedule ks1,
+        des_key_schedule ks2, des_cblock *ivec, int *num);
+
+ void des_ede3_cbc_encrypt(const unsigned char *input,
+        unsigned char *output, long length, des_key_schedule ks1,
+        des_key_schedule ks2, des_key_schedule ks3, des_cblock *ivec,
+        int enc);
+ void des_ede3_cbcm_encrypt(const unsigned char *in, unsigned char *out, 
+        long length, des_key_schedule ks1, des_key_schedule ks2, 
+        des_key_schedule ks3, des_cblock *ivec1, des_cblock *ivec2, 
+        int enc);
+ void des_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out, 
+        long length, des_key_schedule ks1, des_key_schedule ks2,
+        des_key_schedule ks3, des_cblock *ivec, int *num, int enc);
+ void des_ede3_ofb64_encrypt(const unsigned char *in, unsigned char *out, 
+        long length, des_key_schedule ks1, 
+        des_key_schedule ks2, des_key_schedule ks3, 
+        des_cblock *ivec, int *num);
+
+ int des_read_password(des_cblock *key, const char *prompt, int verify);
+ int des_read_2passwords(des_cblock *key1, des_cblock *key2, 
+        const char *prompt, int verify);
+ int des_read_pw_string(char *buf, int length, const char *prompt,
+        int verify);
+
+ DES_LONG des_cbc_cksum(const unsigned char *input, des_cblock *output, 
+        long length, des_key_schedule schedule, 
+        const_des_cblock *ivec);
+ DES_LONG des_quad_cksum(const unsigned char *input, des_cblock output[], 
+        long length, int out_count, des_cblock *seed);
+ void des_string_to_key(const char *str, des_cblock *key);
+ void des_string_to_2keys(const char *str, des_cblock *key1,
+        des_cblock *key2);
+
+ char *des_fcrypt(const char *buf, const char *salt, char *ret);
+ char *des_crypt(const char *buf, const char *salt);
+ char *crypt(const char *buf, const char *salt);
+
+ int des_enc_read(int fd, void *buf, int len, des_key_schedule sched,
+        des_cblock *iv);
+ int des_enc_write(int fd, const void *buf, int len,
+        des_key_schedule sched, des_cblock *iv);
+
+=head1 DESCRIPTION
+
+This library contains a fast implementation of the DES encryption
+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
+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.
+
+des_random_key() generates a random key.  The PRNG must be seeded
+prior to using this function (see L<rand(3)|rand(3)>; for backward
+compatibility the function des_random_seed() is available as well).
+If the PRNG could not generate a secure key, 0 is returned.  In
+earlier versions of the library, des_random_key() did not generate
+secure keys.
+
+Before a DES key can be used, it must be converted into the
+architecture dependant I<des_key_schedule> via the
+des_set_key_checked() or des_set_key_unchecked() function.
+
+des_set_key_checked() will check that the key passed is of odd parity
+and is not a week or semi-weak key.  If the parity is wrong, then -1
+is returned.  If the key is a weak key, then -2 is returned.  If an
+error is returned, the key schedule is not generated.
+
+des_set_key() (called des_key_sched() in the MIT library) works like
+des_set_key_checked() if the I<des_check_key> flag is non-zero,
+otherwise like des_set_key_unchecked().  These functions are available
+for compatibility; it is recommended to use a function that does not
+depend on a global variable.
+
+des_set_odd_parity() (called des_fixup_key_parity() in the MIT
+library) sets the parity of the passed I<key> to odd.
+
+des_is_weak_key() returns 1 is the passed key is a weak key, 0 if it
+is ok.  The probability that a randomly generated key is weak is
+1/2^52, so it is not really worth checking for them.
+
+The following routines mostly operate on an input and output stream of
+I<des_cblock>s.
+
+des_ecb_encrypt() is the basic DES encryption routine that encrypts or
+decrypts a single 8-byte I<des_cblock> in I<electronic code book>
+(ECB) mode.  It always transforms the input data, pointed to by
+I<input>, into the output data, pointed to by the I<output> argument.
+If the I<encrypt> argument is non-zero (DES_ENCRYPT), the I<input>
+(cleartext) is encrypted in to the I<output> (ciphertext) using the
+key_schedule specified by the I<schedule> argument, previously set via
+I<des_set_key>. If I<encrypt> is zero (DES_DECRYPT), the I<input> (now
+ciphertext) is decrypted into the I<output> (now cleartext).  Input
+and output may overlap.  des_ecb_encrypt() does not return a value.
+
+des_ecb3_encrypt() encrypts/decrypts the I<input> block by using
+three-key Triple-DES encryption in ECB mode.  This involves encrypting
+the input with I<ks1>, decrypting with the key schedule I<ks2>, and
+then encrypting with I<ks3>.  This routine greatly reduces the chances
+of brute force breaking of DES and has the advantage of if I<ks1>,
+I<ks2> and I<ks3> are the same, it is equivalent to just encryption
+using ECB mode and I<ks1> as the key.
+
+The macro des_ecb2_encrypt() is provided to perform two-key Triple-DES
+encryption by using I<ks1> for the final encryption.
+
+des_ncbc_encrypt() encrypts/decrypts using the I<cipher-block-chaining>
+(CBC) mode of DES.  If the I<encrypt> argument is non-zero, the
+routine cipher-block-chain encrypts the cleartext data pointed to by
+the I<input> argument into the ciphertext pointed to by the I<output>
+argument, using the key schedule provided by the I<schedule> argument,
+and initialization vector provided by the I<ivec> argument.  If the
+I<length> argument is not an integral multiple of eight bytes, the
+last block is copied to a temporary area and zero filled.  The output
+is always an integral multiple of eight bytes.
+
+des_xcbc_encrypt() is RSA's DESX mode of DES.  It uses I<inw> and
+I<outw> to 'whiten' the encryption.  I<inw> and I<outw> are secret
+(unlike the iv) and are as such, part of the key.  So the key is sort
+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
+really an 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
+chaing 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
+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.
+
+des_cfb64_encrypt()
+implements CFB mode of DES with 64bit 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
+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 :-).
+
+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
+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.
+
+des_ofb64_encrypt() is the same as des_cfb64_encrypt() using Output
+Feed Back mode.
+
+des_ede3_ofb64_encrypt() and des_ede2_ofb64_encrypt() is the same as
+des_ofb64_encrypt(), using Triple-DES.
+
+The following functions are included in the DES library for
+compatibility with the MIT Kerberos library. des_read_pw_string()
+is also available under the name EVP_read_pw_string().
+
+des_read_pw_string() writes the string specified by I<prompt> to
+standarf output, turns echo off and reads in input string from the
+terminal.  The string is returned in I<buf>, which must have space for
+at least I<length> bytes.  If I<verify> is set, the user is asked for
+the password twice and unless the two copies match, an error is
+returned.  A return code of -1 indicates a system error, 1 failure due
+to use interaction, and 0 is success.
+
+des_read_password() does the same and converts the password to a DES
+key by calling des_string_to_key(); des_read_2password() operates in
+the same way as des_read_password() except that it generates two keys
+by using the des_string_to_2key() function.  des_string_to_key() is
+available for backward compatibility with the MIT library.  New
+applications should use a cryptographic hash function.  The same
+applies for des_string_to_2key().
+
+des_cbc_cksum() produces an 8 byte checksum based on the input stream
+(via CBC encryption).  The last 4 bytes of the checksum are returned
+and the complete 8 bytes are placed in I<output>. This function is
+used by Kerberos v4.  Other applications should use
+L<EVP_DigestInit(3)|EVP_DigestInit(3)> etc. instead.
+
+des_quad_cksum() is a Kerberos v4 function.  It returns a 4 byte
+checksum from the input bytes.  The algorithm can be iterated over the
+input, depending on I<out_count>, 1, 2, 3 or 4 times.  If I<output> is
+non-NULL, the 8 bytes generated by each pass are written into
+I<output>.
+
+The following are DES-based tranformations:
+
+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
+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.
+
+des_crypt() is a faster replacement for the normal system crypt().
+This function calls des_fcrypt() with a static array passed as the
+third parameter.  This emulates the normal non-thread safe semantics
+of crypt(3).
+
+des_enc_write() writes I<len> bytes to file descriptor I<fd> from
+buffer I<buf>. The data is encrypted via I<pcbc_encrypt> (default)
+using I<sched> for the key and I<iv> as a starting vector.  The actual
+data send down I<fd> consists of 4 bytes (in network byte order)
+containing the length of the following encrypted data.  The encrypted
+data then follows, padded with random data out to a multiple of 8
+bytes.
+
+des_enc_read() is used to read I<len> bytes from file descriptor
+I<fd> into buffer I<buf>. The data being read from I<fd> is assumed to
+have come from des_enc_write() and is decrypted using I<sched> for
+the key schedule and I<iv> for the initial vector.
+
+B<Warning:> The data format used by des_enc_write() and des_enc_read()
+has a cryptographic weakness: When asked to write more than MAXWRITE
+bytes, des_enc_write() will split the data into several chunks that
+are all encrypted using the same IV.  So don't use these functions
+unless you are sure you know what you do (in which case you might not
+want to use them anyway).  They cannot handle non-blocking sockets.
+des_enc_read() uses an internal state and thus cannot be used on
+multiple files.
+
+I<des_rw_mode> is used to specify the encryption mode to use with
+des_enc_read() and des_end_write().  If set to I<DES_PCBC_MODE> (the
+default), des_pcbc_encrypt is used.  If set to I<DES_CBC_MODE>
+des_cbc_encrypt is used.
+
+=head1 NOTES
+
+Single-key DES is insecure due to its short key size.  ECB mode is
+not suitable for most applications; see L<des_modes(7)|des_modes(7)>.
+
+The L<evp(3)|evp(3)> library provides higher-level encryption functions.
+
+=head1 BUGS
+
+des_3cbc_encrypt() is flawed and must not be used in applications.
+
+des_cbc_encrypt() does not modify B<ivec>; use des_ncbc_encrypt()
+instead.
+
+des_cfb_encrypt() and des_ofb_encrypt() operates on input of 8 bits.
+What this means is that if you set numbits to 12, and length to 2, the
+first 12 bits will come from the 1st input byte and the low half of
+the second input byte.  The second 12 bits will have the low 8 bits
+taken from the 3rd input byte and the top 4 bits taken from the 4th
+input byte.  The same holds for output.  This function has been
+implemented this way because most people will be using a multiple of 8
+and because once you get into pulling bytes input bytes apart things
+get ugly!
+
+des_read_pw_string() is the most machine/OS dependent function and
+normally generates the most problems when porting this code.
+
+=head1 CONFORMING TO
+
+ANSI X3.106
+
+The B<des> library was written to be source code compatible with
+the MIT Kerberos library.
+
+=head1 SEE ALSO
+
+crypt(3), L<des_modes(3)|des_modes(3)>, L<evp(3)|evp(3)>, L<rand(3)|rand(3)>
+
+=head1 HISTORY
+
+des_cbc_cksum(), des_cbc_encrypt(), des_ecb_encrypt(),
+des_is_weak_key(), des_key_sched(), des_pcbc_encrypt(),
+des_quad_cksum(), des_random_key(), des_read_password() and
+des_string_to_key() are available in the MIT Kerberos library;
+des_check_key_parity(), des_fixup_key_parity() and des_is_weak_key()
+are available in newer versions of that library.
+
+des_set_key_checked() and des_set_key_unchecked() were added in
+OpenSSL 0.9.5.
+
+des_generate_random_block(), des_init_random_number_generator(),
+des_new_random_key(), des_set_random_generator_seed() and
+des_set_sequence_number() and des_rand_data() are used in newer
+versions of Kerberos but are not implemented here.
+
+des_random_key() generated cryptographically weak random data in
+SSLeay and in OpenSSL prior version 0.9.5, as well as in the original
+MIT library.
+
+=head1 AUTHOR
+
+Eric Young (eay@cryptsoft.com). Modified for the OpenSSL project
+(http://www.openssl.org).
+
+=cut