Function ink_env::ecdsa_recover

pub fn ecdsa_recover(
    signature: &[u8; 65], 
    message_hash: &[u8; 32], 
    output: &mut [u8; 33]
) -> Result<()>

Recovers the compressed ECDSA public key for given signature and message_hash, and stores the result in output.

Example

const signature: [u8; 65] = [
    161, 234, 203,  74, 147, 96,  51, 212,   5, 174, 231,   9, 142,  48, 137, 201,
    162, 118, 192,  67, 239, 16,  71, 216, 125,  86, 167, 139,  70,   7,  86, 241,
     33,  87, 154, 251,  81, 29, 160,   4, 176, 239,  88, 211, 244, 232, 232,  52,
    211, 234, 100, 115, 230, 47,  80,  44, 152, 166,  62,  50,   8,  13,  86, 175,
     28,
];
const message_hash: [u8; 32] = [
    162, 28, 244, 179, 96, 76, 244, 178, 188,  83, 230, 248, 143, 106,  77, 117,
    239, 95, 244, 171, 65, 95,  62, 153, 174, 166, 182,  28, 130,  73, 196, 208
];
const EXPECTED_COMPRESSED_PUBLIC_KEY: [u8; 33] = [
      2, 121, 190, 102, 126, 249, 220, 187, 172, 85, 160,  98, 149, 206, 135, 11,
      7,   2, 155, 252, 219,  45, 206,  40, 217, 89, 242, 129,  91,  22, 248, 23,
    152,
];
let mut output = [0; 33];
ink_env::ecdsa_recover(&signature, &message_hash, &mut output);
assert_eq!(output, EXPECTED_COMPRESSED_PUBLIC_KEY);