Anonymous user
Bitcoin/address validation: Difference between revisions
→{{header|Ruby}}: Add Rust implementation
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Line 1,169:
I think the checksum should be c046b30d
I calculate that it is c046b2ff
</pre>
=={{header|Rust}}==
This requires the [https://crates.io/crates/rust-crypto rust-crypto] crate for sha256.
<lang Rust>
extern crate crypto;
use crypto::digest::Digest;
use crypto::sha2::Sha256;
const DIGITS58: [char; 58] = ['1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'];
fn main() {
println!("{}", validate_address("1AGNa15ZQXAZUgFiqJ3i7Z2DPU2J6hW62i"));
println!("{}", validate_address("1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62i"));
println!("{}", validate_address("17NdbrSGoUotzeGCcMMCqnFkEvLymoou9j"));
println!("{}", validate_address("17NdbrSGoUotzeGCcMMC?nFkEvLymoou9j"));
}
fn validate_address(address: &str) -> bool {
let decoded = match from_base58(address, 25) {
Ok(x) => x,
Err(_) => return false
};
if decoded[0] != 0 {
return false;
}
let mut sha = Sha256::new();
sha.input(&decoded[0..21]);
let mut first_round = vec![0u8; sha.output_bytes()];
sha.result(&mut first_round);
sha.reset();
sha.input(&first_round);
let mut second_round = vec![0u8; sha.output_bytes()];
sha.result(&mut second_round);
if second_round[0..4] != decoded[21..25] {
return false
}
true
}
fn from_base58(encoded: &str, size: usize) -> Result<Vec<u8>, String> {
let mut res: Vec<u8> = vec![0; size];
for base58_value in encoded.chars() {
let mut value: u32 = match DIGITS58
.iter()
.position(|x| *x == base58_value){
Some(x) => x as u32,
None => return Err(String::from("Invalid character found in encoded string."))
};
for result_index in (0..size).rev() {
value += 58 * res[result_index] as u32;
res[result_index] = (value % 256) as u8;
value /= 256;
}
}
Ok(res)
}
</lang>
{{out}}
<pre>
false
true
true
false
</pre>
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