added simple password generator to duralumin binary

Cargo.toml

@@ -8,13 +8,14 @@ name = "libduralumin"
 path = "src/lib.rs"
 
 [features]
-default = ["passphrase-gen", "ed25519", "clap", "rpassword", "base64"]
+default = ["passphrase-gen", "password-gen", "ed25519", "clap", "rpassword", "base64"]
 ed25519 = ["osshkeys", "sha2"]
 passphrase-gen = []
+password-gen = []
 
 [[bin]]
 name = "duralumin"
-required-features = ["passphrase-gen", "clap"]
+required-features = ["passphrase-gen", "password-gen", "clap", "clap/derive"]
 
 [[bin]]
 name = "duralumin-keygen"

src/bin/duralumin.rs

@@ -1,7 +1,10 @@
 use std::path::PathBuf;
 
-use clap::Parser;
-use libduralumin::passphrase_gen::{PassPhraseGenerator, Words};
+use clap::{Parser, Subcommand};
+use libduralumin::{
+    passphrase_gen::{PassPhraseGenerator, Words},
+    password_gen::PasswordGenerator,
+};
 
 /// program that generates random passphrases.
 #[derive(Parser)]
@@ -11,6 +14,18 @@ use libduralumin::passphrase_gen::{PassPhraseGenerator, Words};
     author = "No One <noonebtw@nirgendwo.xyz>"
 )]
 struct Opts {
+    #[clap(subcommand)]
+    command: Subcommands,
+}
+
+#[derive(Subcommand)]
+enum Subcommands {
+    Passphrase(PassphraseGenArgs),
+    Password(PasswordGenArgs),
+}
+
+#[derive(Parser)]
+struct PassphraseGenArgs {
     #[clap(short = 'l', long)]
     num_words: Option<i16>,
     #[clap(long)]
@@ -27,7 +42,35 @@ struct Opts {
     backend: String,
 }
 
-impl Opts {
+#[derive(Parser)]
+struct PasswordGenArgs {
+    /// number of passwords to generate
+    #[clap(short = 'c', long = "count", default_value = "1")]
+    count: u16,
+    /// if given, generate a password with an exact length, otherwise choses a length between min and max length.
+    #[clap(long = "length")]
+    exact_length: Option<u16>,
+    /// minimum length of the generated password
+    #[clap(long = "min", default_value = "10")]
+    min_length: u16,
+    /// maximum length of the generated password
+    #[clap(long = "max", default_value = "20")]
+    max_length: u16,
+    /// whether to use lowercase letters in the password
+    #[clap(short = 'l', long)]
+    use_letters: bool,
+    /// whether to use uppercase letters in the password
+    #[clap(short = 'L', long)]
+    use_capital_letters: bool,
+    /// whether to use numbers in the password
+    #[clap(short = 'N', long)]
+    use_numbers: bool,
+    /// whether to use special symbols `(!"§$%$%&\/\\()=?_:;,.-*+#'\\)` in the password
+    #[clap(short = 'S', long)]
+    use_symbols: bool,
+}
+
+impl PassphraseGenArgs {
     /// gets the number of words per passphrase
     pub fn words_per_passphrase(&self) -> i16 {
         self.num_words.unwrap_or(6)
@@ -76,28 +119,53 @@ impl Backend {
 }
 
 fn main() {
-    let opts = Opts::parse();
-    let gen = PassPhraseGenerator::new()
-        .with_capitalized(opts.capitalize())
-        .with_min_word_length(opts.min_word_length)
-        .with_length(opts.words_per_passphrase());
+    let opts: Opts = Opts::parse();
 
-    let words = match opts.backend() {
-        Some(Backend::UseAPassPhrase) => Words::from_str(include_str!("../../useapassphrase.txt")),
-        Some(Backend::EnglishWords) => Words::from_str(include_str!("../../words_alpha.txt")),
-        Some(path) => {
-            Words::from_text_file(std::fs::File::open(path).expect("failed to read word list."))
-                .expect("word list from path.")
-        }
-        None => {
-            panic!("invalid backend.")
-        }
-    };
+    match opts.command {
+        Subcommands::Passphrase(opts) => {
+            let gen = PassPhraseGenerator::new()
+                .with_capitalized(opts.capitalize())
+                .with_min_word_length(opts.min_word_length)
+                .with_length(opts.words_per_passphrase());
 
-    for passphrase in gen
-        .generate_n(&words, opts.passphrase_count() as usize)
-        .expect("failed to generate passphrases. this is bad.")
-    {
-        println!("{}", passphrase);
+            let words = match opts.backend() {
+                Some(Backend::UseAPassPhrase) => {
+                    Words::from_str(include_str!("../../useapassphrase.txt"))
+                }
+                Some(Backend::EnglishWords) => {
+                    Words::from_str(include_str!("../../words_alpha.txt"))
+                }
+                Some(Backend::File(path)) => Words::from_text_file(
+                    std::fs::File::open(path).expect("failed to read word list."),
+                )
+                .expect("word list from path."),
+                None => {
+                    panic!("invalid backend.")
+                }
+            };
+
+            for passphrase in gen
+                .generate_n(&words, opts.passphrase_count() as usize)
+                .expect("failed to generate passphrases. this is bad.")
+            {
+                println!("{}", passphrase);
+            }
+        }
+        Subcommands::Password(args) => {
+            let min_length = args.exact_length.unwrap_or(args.min_length);
+            let max_length = args.exact_length.unwrap_or(args.max_length);
+            let gen = PasswordGenerator::new(
+                min_length,
+                max_length,
+                args.use_letters,
+                args.use_capital_letters,
+                args.use_numbers,
+                args.use_symbols,
+            );
+
+            for password in gen.generate_n(args.count as usize) {
+                println!("{}", password);
+            }
+        }
     }
 }

src/lib.rs

@@ -1,5 +1,8 @@
 #[cfg(feature = "passphrase-gen")]
 pub mod passphrase_gen;
 
+#[cfg(feature = "password-gen")]
+pub mod password_gen;
+
 #[cfg(feature = "ed25519")]
 pub mod ed25519;

src/passphrase_gen.rs

@@ -80,11 +80,7 @@ impl PassPhraseGenerator {
         self
     }
 
-    pub fn generate_n(
-        &self,
-        words: &Words,
-        count: usize,
-    ) -> Option<Vec<String>> {
+    pub fn generate_n(&self, words: &Words, count: usize) -> Option<Vec<String>> {
         (0..count).map(|_| self.generate(words)).collect()
     }
 
@@ -104,10 +100,7 @@ impl PassPhraseGenerator {
 
                             match chars.next() {
                                 None => String::new(),
-                                Some(c) => {
-                                    c.to_uppercase().collect::<String>()
-                                        + chars.as_str()
-                                }
+                                Some(c) => c.to_uppercase().collect::<String>() + chars.as_str(),
                             }
                         } else {
                             word.to_string()

src/password_gen.rs

@@ -0,0 +1,71 @@
+use rand::{prelude::SliceRandom, rngs::OsRng, Rng};
+
+const LETTERS: &[u8] = b"abcdefghijklmnopqrstuvwxyz";
+const CAPITAL_LETTERS: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+const NUMBERS: &[u8] = b"0123456789";
+const SYMBOLS: &[u8] = br#" !#$%"&'()*+,-./:;<=>?@[\]^_`{|}~"#;
+
+pub struct PasswordGenerator {
+    min_length: u16,
+    max_length: u16,
+    letters: bool,
+    capital_letters: bool,
+    numbers: bool,
+    symbols: bool,
+}
+
+impl PasswordGenerator {
+    pub fn new_exact_length(
+        length: u16,
+        letters: bool,
+        capital_letters: bool,
+        numbers: bool,
+        symbols: bool,
+    ) -> Self {
+        Self::new(length, length, letters, capital_letters, numbers, symbols)
+    }
+
+    pub fn new(
+        min_length: u16,
+        max_length: u16,
+        letters: bool,
+        capital_letters: bool,
+        numbers: bool,
+        symbols: bool,
+    ) -> Self {
+        Self {
+            min_length,
+            max_length,
+            letters,
+            capital_letters,
+            numbers,
+            symbols,
+        }
+    }
+
+    pub fn generate(&self) -> String {
+        let length = OsRng.gen_range(self.min_length..=self.max_length) as usize;
+
+        let set = [
+            self.letters.then(|| LETTERS.iter()),
+            self.capital_letters.then(|| CAPITAL_LETTERS.iter()),
+            self.numbers.then(|| NUMBERS.iter()),
+            self.symbols.then(|| SYMBOLS.iter()),
+        ]
+        .into_iter()
+        .flatten()
+        .flatten()
+        .collect::<Vec<_>>();
+
+        let mut bytes = std::iter::repeat_with(|| **set.choose(&mut OsRng).unwrap())
+            .take(length)
+            .collect::<Vec<_>>();
+        bytes.shuffle(&mut OsRng);
+
+        String::from_utf8(bytes).expect("password bytes to utf8 string.")
+    }
+
+    pub fn generate_n(&self, n: usize) -> Vec<String> {
+        std::iter::repeat_with(|| self.generate()).take(n).collect()
+    }
+}