javacryptographysha256cryptographic-hash-function

How to hash some String with SHA-256 in Java?

How can I hash some String with SHA-256 in Java?

Solution

  • SHA-256 isn't an "encoding" - it's a one-way hash.

    You'd basically convert the string into bytes (e.g. using text.getBytes(StandardCharsets.UTF_8)) and then hash the bytes. Note that the result of the hash would also be arbitrary binary data, and if you want to represent that in a string, you should use base64 or hex... don't try to use the String(byte[], String) constructor.

    e.g.

    MessageDigest digest = MessageDigest.getInstance("SHA-256");
byte[] hash = digest.digest(text.getBytes(StandardCharsets.UTF_8));