slow but works

.gitignore

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+/target

Cargo.toml

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+[package]
+name = "vanity-rage"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+"rayon" = "1.8.0"
+"age" = "0.9.2"
+"glob-match" = "0.2.1"

src/main.rs

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+use age::{self, secrecy::ExposeSecret, Identity, Recipient};
+use glob_match::glob_match;
+use rayon::prelude::*;
+use std::{env, process};
+
+fn try_generate(pattern: String) -> Option<(String, String)> {
+    let key_priv = age::x25519::Identity::generate();
+    let key_pub = key_priv.to_public();
+
+    // TODO: ignore case
+    glob_match(&pattern, &key_pub.to_string()).then_some((
+        key_priv.to_string().expose_secret().to_string(),
+        key_pub.to_string(),
+    ))
+}
+
+fn main() {
+    let args = env::args();
+    let pattern = if args.len() < 2 {
+        println!(std::concat!(
+            "Usage: \n",
+            "  vanity-rage [QUERY]\n",
+            "\n",
+            "Queries follow standard glob syntax:\n",
+            "  ?      - match any single character\n",
+            "  *      - match zero or more characters\n",
+            "  [abc]  - match any character within the brackets\n",
+            "  [!abc] - match any character not within the brackets\n",
+            "\n",
+            "The provided glob should be able to match the returned key length\n",
+        ));
+        process::exit(64);
+    } else {
+        format!("age1{}", args.last().unwrap())
+    };
+
+    let keypair: (String, String) = loop {
+        if let Some(x) = try_generate(pattern.clone()) {
+            break x;
+        };
+    };
+
+    println!("{:#?}", keypair);
+}