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+/************************************************************************************************
+ Random Password Generation
+    1. Defining keyword arguments control the length and characters
+	   used in the password.
+    2. Building a macro variable containing all allowed characters.
+    3. In a loop, using %SUBSTR(%SYSFUNC(RAND)) to pluck random characters...
+    4. ...and appending them to the growing password.
+    5. Testing our macro via a simple loop and various settings.
+    6. Using a random password for an encryption key on a tempoarary dataset.
+
+    Keywords: Macro
+	SAS Versions: SAS 9, SAS Viya
+    Documentation: https://go.documentation.sas.com/doc/en/pgmsascdc/default/mcrolref/titlepage.htm
+
+    NOTES:
+	1. Only tested with SAS OnDemand for Academics, as that is the only
+	   SAS version I have access to.
+	2. Does not (currently) support unmatched single or double quote characters
+	   in the special characterw string. I have not tried mismatched left or
+	   right parentheses, either.
+************************************************************************************************/
+
+/************************************************************************************************
+ 1. Defining keyword arguments control the length and characters
+    used in the password.
+    a. len= is the desired length of the password, defaulting to 24
+	b. digits= is a Boolean flag, defaulting to TRUE. When TRUE (non-zero),
+	   digits 0-9 are available for use in the password.
+	c. special= is a set of special characters to also use in passwords. Defaults
+	   to those shown in the %NRSTR(). Use special= to not have any specials.
+************************************************************************************************/
+%MACRO RANDPASS(len=24,digits=1,special=%NRSTR(@%&#!?.-_+*,/;:));
+%LOCAL pass;
+%LOCAL chars;
+%LOCAL numchars;
+%LOCAL pick;
+%LOCAL i;
+
+/************************************************************************************************
+ 2. Building a macro variable containing all allowed characters.
+    a. Add the lowercase letters.
+	b. Add uppercase characters via %UPCASE().
+	c. Add digits, if requested.
+	d. Add special characters. Note the use of %SUPERQ() to avoid issues
+	   with &s and %s that may be present in the string.
+************************************************************************************************/
+%LET chars=abcdefghijklmnopqrstuvwxyz;
+%LET chars=&chars%UPCASE(&chars);
+%IF &digits %THEN
+	%LET chars=&chars.0123456789;
+%LET chars=&chars%SUPERQ(special);
+
+%LET numchars=%length(&chars);
+
+%DO i=1 %TO &len;
+	/************************************************************************************************
+	 3. In a loop, using %SUBSTR(%SYSFUNC(RAND)) to pluck random characters...
+	    a. RAND('INTEGER', n) produces a random intger between 1 and n, inclusive
+		   which is exactly what we need.
+		b. %SYSFUNC() invokes it from Macro.
+		c. %SUBSTR(string, N, 1) plucks the Nth character from the string.
+	************************************************************************************************/
+	%LET pick=%SUBSTR(&chars,%SYSFUNC(RAND(INTEGER,&numchars)),1);
+
+	/************************************************************************************************
+	 4. ...and appending them to the growing password.
+	    a. Note in particular the shenanigans here.
+		b. Simply coding "%LET pass=%SUPERQ(pass)&pick" _does_not_work_. Hidden
+		   macro quoting characters end up in &pass, in a nested fashion, and
+		   this produces nested Macro function WARNINGs when the password length
+		   grows to about 12 characters, which is unacceptable.
+		c. The %QSUBSTR() manages to avoid this problem, and also avoids attempts
+		   to resolve any &foo that might appear in the growing password.
+		d. However, %QSUBSTR() can't work on an empty string, so we have to avoid
+		   it first time though, hence the %IF.
+	************************************************************************************************/
+	%IF &i = 1 %THEN
+		%LET pass=&pick;
+	%ELSE
+		%LET pass=%QSUBSTR(%SUPERQ(pass),1)&pick;
+%END;
+
+%* The result of the macro is this generated password;
+%SUPERQ(pass)
+
+%MEND;
+
+/************************************************************************************************
+ 5. Testing our macro via a simple loop, and various settings.
+    a. We need to define a macro for this. Macro now allows %IF statements in
+	   "open code", but not loops.
+	b. Just two cases here. All-defaults, plus longer-no-digits-no-specials.
+	c. The "test" just prints them to the log, for eyeballing.
+	d. Then we run the loop 3 times to get an idea as to what it's doing.
+************************************************************************************************/
+%MACRO TEST(n);
+	%DO i=1 %TO &n;
+		%PUT pw1=%RANDPASS();
+		%PUT pw2=%RANDPASS(len=30,digits=0,special=);
+	%END;
+%MEND;
+
+%TEST(3);
+
+
+
+/************************************************************************************************
+ 6. Using a random password for an encryption key on a tempoarary dataset.
+    a. Generate a longish (60 characters) password, safe from prying eyes.
+	b. We import a list of NSA recruits from a secret location no one has
+	   ever heard of, and protect it with AES encryption with our generated
+	   password.
+	c. Now we can run analytics on it safely. Here, we run PROC MEANS, and
+	   then ponder why the recruits are all teenagers.
+	d. Now we can drop the table (I used PROC SQL), knowing that even if the
+	   data was recovered from the disk, the encryption renders it unreadable.
+************************************************************************************************/
+%LET pw=%randpass(len=60);
+%*PUT pw=&pw   <== to see it, but its supposed to be a secret;
+
+DATA nsaclass(ENCRYPT=aes ENCRYPTKEY="&pw");
+	SET sashelp.class;
+RUN;
+
+PROC MEANS DATA=nsaclass(ENCRYPTKEY="&pw");
+RUN;
+
+PROC SQL;
+	DROP TABLE nsaclass;
+QUIT;