Alpha Chen
8 years ago
parent
60c6352c46
commit
92a1c0f285
@ -0,0 +1,64 @@
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use std::char;
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use crypto::digest::Digest;
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use crypto::md5::Md5;
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use errors::*;
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pub fn solve(input: &str) -> Result<String> {
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let pw = Password::new(input.trim());
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Ok(pw.take(8).collect())
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}
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struct Password {
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id: String,
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index: usize,
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md5: Md5,
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}
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impl Password {
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fn new(id: &str) -> Self {
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Password{id: id.into(), index: 0, md5: Md5::new()}
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}
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}
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impl Iterator for Password {
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// we will be counting with usize
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type Item = char;
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// next() is the only required method
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fn next(&mut self) -> Option<char> {
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let mut result = None;
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let mut hash = [0; 16];
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while result.is_none() {
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let input = format!("{}{}", self.id, self.index);
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self.index += 1;
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self.md5.input_str(&input);
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self.md5.result(&mut hash);
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self.md5.reset();
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if self.index % 1000000 == 0 {
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println!("{}", self.index);
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}
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if hash[0] as u16 + hash[1] as u16 + (hash[2] >> 4) as u16 == 0 {
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result = Some(char::from_digit((hash[2] & 0b00001111) as u32, 16).unwrap());
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break
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}
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}
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result
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}
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}
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#[test]
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fn test_password() {
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let mut pw = Password{id: "abc".into(), index: 3231928, md5: Md5::new()};
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assert_eq!(pw.next(), Some('1'.into()));
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assert_eq!(pw.index, 3231930);
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let mut pw = Password{id: "abc".into(), index: 5017308, md5: Md5::new()};
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assert_eq!(pw.next(), Some('8'.into()));
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assert_eq!(pw.next(), Some('f'.into()));
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}
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