---
title: "BLAKE2b-256"
description: "BLAKE2b with a 32-byte output. Sui addresses and Cardano transaction ids. Not half of the 64-byte digest"
canonical_url: "https://hashes.agntn.dev/algorithms/blake2b-256"
---
# BLAKE2b-256

> BLAKE2b with a 32-byte output. Sui addresses and Cardano transaction ids. Not half of the 64-byte digest

<algorithm-facts name="blake2b-256">



</algorithm-facts>

BLAKE2b told up front to produce 32 bytes. The length goes into the parameter block, so the digest isn't the first half of [BLAKE2b](https://hashes.agntn.dev/algorithms/blake2b)'s:

```ts
create("blake2b-256").hash("abc").digest;
// "bddd813c634239723171ef3fee98579b94964e3bb1cb3e427262c8c068d52319"
create("blake2b").hash("abc").digest.slice(0, 64);
// "ba80a53f981c4d0d6a2797b69f12f6e94c212f14685ac4b74b12bb6fdbffa2d1", not the same
```

That's the mistake worth a page. Sui derives addresses with it, Cardano names transactions with it, and truncating the long one gives a digest that looks fine and that nobody will ever match. No HMAC mode.


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