feat: add util::digest_sha256

src/util.rs

@@ -0,0 +1,12 @@
+use sha2::{  Digest, Sha256 };
+
+pub fn digest_sha256(bs: &[u8]) -> Vec<u8> {
+    let mut sha256 = Sha256::new();
+    sha256.update(bs);
+    sha256.finalize().to_vec()
+}
+
+#[test]
+fn test_digest_sha256() {
+    assert_eq!(hex::decode("b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9").unwrap(), digest_sha256(b"hello world"));
+}