first commit, SM2-DSA only

doc/crypto/ui_compat.pod

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+=pod
+
+=head1 NAME
+
+des_read_password, des_read_2passwords, des_read_pw_string, des_read_pw -
+Compatibility user interface functions
+
+=head1 SYNOPSIS
+
+ #include <openssl/des_old.h>
+
+ 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);
+ int des_read_pw(char *buf,char *buff,int size,const char *prompt,int verify);
+
+=head1 DESCRIPTION
+
+The DES library contained a few routines to prompt for passwords.  These
+aren't necessarely dependent on DES, and have therefore become part of the
+UI compatibility library.
+
+des_read_pw() writes the string specified by I<prompt> to standard output
+turns echo off and reads an input string from the terminal.  The string is
+returned in I<buf>, which must have spac for at least I<size> bytes.
+If I<verify> is set, the user is asked for the password twice and unless
+the two copies match, an error is returned.  The second password is stored
+in I<buff>, which must therefore also be at least I<size> bytes.  A return
+code of -1 indicates a system error, 1 failure due to use interaction, and
+0 is success.  All other functions described here use des_read_pw() to do
+the work.
+
+des_read_pw_string() is a variant of des_read_pw() that provides a buffer
+for you if I<verify> is set.
+
+des_read_password() calls des_read_pw() 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.
+
+=head1 NOTES
+
+des_read_pw_string() is available in the MIT Kerberos library as well, and
+is also available under the name EVP_read_pw_string().
+
+=head1 SEE ALSO
+
+L<ui(3)|ui(3)>, L<ui_create(3)|ui_create(3)>
+
+=head1 AUTHOR
+
+Richard Levitte (richard@levitte.org) for the OpenSSL project
+(http://www.openssl.org).
+
+=cut