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Russell Champoux committed
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@@ -0,0 +1,81 @@
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[root]
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name = "day05"
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version = "0.1.0"
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dependencies = [
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"rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "gcc"
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version = "0.3.39"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "kernel32-sys"
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version = "0.2.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
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"winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "libc"
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version = "0.2.18"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "rand"
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version = "0.3.15"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"libc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "rust-crypto"
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version = "0.2.36"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"gcc 0.3.39 (registry+https://github.com/rust-lang/crates.io-index)",
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"libc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
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"rand 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
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"rustc-serialize 0.3.21 (registry+https://github.com/rust-lang/crates.io-index)",
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"time 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "rustc-serialize"
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version = "0.3.21"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "time"
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version = "0.1.35"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
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"libc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
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"winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "winapi"
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version = "0.2.8"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "winapi-build"
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version = "0.1.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[metadata]
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"checksum gcc 0.3.39 (registry+https://github.com/rust-lang/crates.io-index)" = "771e4a97ff6f237cf0f7d5f5102f6e28bb9743814b6198d684da5c58b76c11e0"
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"checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
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"checksum libc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)" = "a51822fc847e7a8101514d1d44e354ba2ffa7d4c194dcab48870740e327cac70"
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"checksum rand 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "022e0636ec2519ddae48154b028864bdce4eaf7d35226ab8e65c611be97b189d"
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"checksum rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)" = "f76d05d3993fd5f4af9434e8e436db163a12a9d40e1a58a726f27a01dfd12a2a"
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"checksum rustc-serialize 0.3.21 (registry+https://github.com/rust-lang/crates.io-index)" = "bff9fc1c79f2dec76b253273d07682e94a978bd8f132ded071188122b2af9818"
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"checksum time 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)" = "3c7ec6d62a20df54e07ab3b78b9a3932972f4b7981de295563686849eb3989af"
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"checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
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"checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
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@@ -0,0 +1,7 @@
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[package]
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name = "day05"
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version = "0.1.0"
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authors = ["~krowbar"]
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[dependencies]
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rust-crypto = "^0.2"
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@@ -0,0 +1,79 @@
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extern crate crypto;
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use crypto::md5::Md5;
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use crypto::digest::Digest;
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//This was mostly stolen from a github gist that I found while looking for a Rust MD5 library
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fn part_1() {
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let mut hasher = Md5::new();
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let key = "reyedfim".as_bytes();
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let mut answer: Vec<u8> = vec![];
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let mut count = 8;
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for i in 0..std::u64::MAX {
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hasher.input(key);
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hasher.input(i.to_string().as_bytes());
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let mut output = [0; 16]; //represents MD5 string
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hasher.result(&mut output);
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//check the first two and a half bytes of the output
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let first_five = output[0] as i32 + output[1] as i32 + (output[2] >> 4) as i32;
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if first_five == 0 {
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let output_str: String = output.iter().map(|&c| format!("{:x}{:x}", c >> 4, c)).collect();
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println!("hashed {} to get {}", i, output_str);
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answer.push(output[2]);
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match count > 1 {
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true => count -= 1,
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false => break,
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}
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}
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hasher.reset();
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}
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let answer_str: String = answer.iter().map(|&c| format!("{:x}", c)).collect();
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println!("Part 1: Answer is {}", answer_str);
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}
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fn part_2() {
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let mut hasher = Md5::new();
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let key = "reyedfim".as_bytes();
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let mut answer = [0; 8];
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let mut answer_mask = [true; 8];
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for i in 0..std::u64::MAX {
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hasher.input(key);
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hasher.input(i.to_string().as_bytes());
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let mut output = [0; 16]; //represents MD5 string
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hasher.result(&mut output);
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//check the first two and a half bytes of the output
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let first_five = output[0] as i32 + output[1] as i32 + (output[2] >> 4) as i32;
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if first_five == 0 {
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let output_str: String = output.iter().map(|&c| format!("{:x}{:x}", c >> 4, c)).collect();
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println!("hashed {} to get {}", i, output_str);
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//answer.push(output[2]);
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let idx = output[2] as usize;
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let val = output[3] >> 4;
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if idx < 8 && answer_mask[idx] {
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answer[idx] = val;
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answer_mask[idx] = false; //we filled this slot
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println!("Values are {} and {}", idx, val);
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match answer_mask.iter().fold(false, |f, &i| f || i) {
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true => {}, //keep going
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false => break, //we're all done here
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}
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}
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}
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hasher.reset();
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}
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let answer_str: String = answer.iter().map(|&c| format!("{:x}", c)).collect();
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println!("Part 1: Answer is {}", answer_str);
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}
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fn main() {
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//part_1();
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part_2();
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}
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