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+/cryptgen

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+LDLIBS += -lcrypt

+all: cryptgen

@@ -2,9 +2,38 @@

 A thin command-line wrapper around [`crypt(3)`][] and [`crypt_gensalt(3)`][].

+**NOTE**: This security-related software includes no error checking and uses

+functions whose documentation states "This function is obsolete. Do not use

+it.". Results are platform-dependent and should be verified manually. It exists

+because its constituent 15 non-empty lines of C provides functionality

+(specifically [`yescrypt`][], the default password hashing scheme on many Linux

+distributions, with automatic parameter encoding and salt generation) that at

+the time of writing is not easily accessible from the command line elsewhere

+([OpenSSL's `passwd`][], [Perl's `crypt`][], [Python's `crypt`][], [Python's

+`hashlib`][]).

+

 [`cryptgen`]: https://git.rcrnstn.net/rcrnstn/cryptgen

 [`crypt(3)`]: https://manpages.debian.org/crypt.3

 [`crypt_gensalt(3)`]: https://manpages.debian.org/crypt_gensalt.3

+[`yescrypt`]: https://www.openwall.com/yescrypt

+[OpenSSL's `passwd`]: https://github.com/openssl/openssl/issues/19340

+[Perl's `crypt`]: https://perldoc.perl.org/functions/crypt

+[Python's `crypt`]: https://docs.python.org/3/library/crypt

+[Python's `hashlib`]: https://docs.python.org/3/library/hashlib

+

+## Usage

+

+```

+cryptgen [<prefix> [<count>]]

+```

+

+where the valid values of the optional `<prefix>` (hashing method) and

+`<count>` ("CPU time cost") parameters are documented in [`crypt(5)`][]. On

+most distributions, if `<prefix>` is not given the best available hashing

+method will be selected, if `<count>` is not given a low default cost will be

+selected.

+

+[`crypt(5)`]: https://manpages.debian.org/crypt.5

 ## License

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+#define _XOPEN_SOURCE 500

+

+#include <stdio.h>

+#include <stdlib.h>

+

+#include <unistd.h>

+#include <crypt.h>

+

+

+int main(int argc, char * argv[])

+{

+    puts(crypt(getpass("Password: "), crypt_gensalt(

+        argc >= 2 ?      argv[1]  : NULL,

+        argc >= 3 ? atoi(argv[2]) : 0,

+        NULL,

+        0

+    )));

+    return EXIT_SUCCESS;

+}