DES_random_key() generates a random key. The PRNG must be seeded
prior to using this function (see L<rand(3)|rand(3)>). 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.
+could not generate a secure key, 0 is returned.
Before a DES key can be used, it must be converted into the
architecture dependent I<DES_key_schedule> via the
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() 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_set_odd_parity() 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.
+DES_is_weak_key() returns 1 if the passed key is a weak key, 0 if it
+is ok.
The following routines mostly operate on an input and output stream of
I<DES_cblock>s.
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.
+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)))>.
=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)>.
+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.
In OpenSSL 0.9.7, all des_ functions were renamed to DES_ to avoid
clashes with older versions of libdes. Compatibility des_ functions
are provided for a short while, as well as crypt().
-Declarations for these are in <openssl/des_old.h>. des_random_seed()
-is were not kept as DES_ variants. This will happen to other functions
+Declarations for these are in <openssl/des_old.h>. There is no DES_
+variant for des_random_seed().
+This will happen to other functions
as well if they are deemed redundant (des_random_seed() just calls
RAND_seed() and is present for backward compatibility only), buggy or
already scheduled for removal.