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kotlinlang

it there any library have hash 160 for kotlin?

Sorry, I don't understand the question. What do you mean?

~I believe they're looking for a library implementing <https://en.wikipedia.org/wiki/HAS-160>~
On second thought, they're more likely to look for an implementation of Bitcoin's HASH160 (which actually is RIPEMD160(SHA256(input)))

And in that case, <https://github.com/komputing/KHash> should do it :slightly_smiling_face:

<https://github.com/jonelo/jacksum> offers support for HAS-160 (if that is meant). It is a Java-library, but you can use it directly from Kotlin.
Here is a sample from someone's cryptography-playground using it:
<https://github.com/norkator/cryptography/blob/master/src/cryptography/hashes/has/HAS.java>

how to include them? I included Bouncy Castle but got the
```java.security.NoSuchAlgorithmException: RIPEMD1600 MessageDigest not available```

```private const val CRYPTO_ALGORITHM_SHA256 = "SHA-256"
private const val CRYPTO_ALGORITHM_RIPEMD160 = "RIPEMD-160"```
```            Security.addProvider(BouncyCastleProvider())
            val sha256 = MessageDigest
                .getInstance(CRYPTO_ALGORITHM_SHA256)
                .digest(publicKey.encoded)

            var hash160 = MessageDigest
                .getInstance(CRYPTO_ALGORITHM_RIPEMD160)
                .digest(sha256)
            val str = hash160.toHexString()```

finally made it.
```            val d = RIPEMD160Digest()
            d.update(sha256, 0, sha256.size)
            var o = ByteArray(d.digestSize)
            d.doFinal(o, 0)
            return o.toHexString()```