data as hex string using lowercase characters.
Lowercase characters are used (e.g.
f9b4ca). The resulting string’s
length is always even, each byte in
data is always encoded using two hex
digits. Thus, the resulting string contains exactly twice as many bytes as
the input data.
assert_eq!(hex::encode("Hello world!"), "48656c6c6f20776f726c6421"); assert_eq!(hex::encode(vec![1, 2, 3, 15, 16]), "0102030f10");