in src/main/java/software/aws/mcs/auth/SigV4AuthProvider.java [314:321]
static String sha256Digest(byte[] bytes) {
try {
final MessageDigest md = MessageDigest.getInstance("SHA-256");
return Hex.encodeHexString(md.digest(bytes), true);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("This platform does not support the SHA-256 digest algorithm", e);
}
}