edda-core 0.2.0

Core event model, hash chain, and schema for Edda
Documentation 
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use sha2::{Digest, Sha256};

/// Compute SHA-256 hash of bytes, returning lowercase hex string.
pub fn sha256_hex(bytes: &[u8]) -> String {
    let mut hasher = Sha256::new();
    hasher.update(bytes);
    hex::encode(hasher.finalize())
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn sha256_empty() {
        let h = sha256_hex(b"");
        assert_eq!(
            h,
            "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
        );
    }

    #[test]
    fn sha256_hello() {
        let h = sha256_hex(b"hello");
        assert_eq!(
            h,
            "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824"
        );
    }

    #[test]
    fn output_is_64_char_lowercase_hex() {
        let h = sha256_hex(b"test");
        assert_eq!(h.len(), 64);
        assert!(h
            .chars()
            .all(|c| c.is_ascii_hexdigit() && !c.is_uppercase()));
    }
}