A collection of Kotlin Multiplatform Mobile cryptographic hashing functions.

Appmattus Limited

Last update: Dec 15, 2022

Related tags

Security & Decompiler android kotlin ios jvm cryptohash kotlin-multiplatform

Overview

crypto

A collection of Kotlin Multiplatform Mobile libraries to aid in mobile app development.

cryptohash: A set of cryptographic (and not so cryptographic) hashing functions.

Contributing

Please fork this repository and contribute back using pull requests.

All contributions, large or small, major features, bug fixes, additional language translations, unit/integration tests are welcomed.

License

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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Comments

Can't be used in Swift on non-main thread

Using Swifts async/await feature and Task.detached {} I load some files in the background where I want to calculate the checksum for.

My code looks like this:

                do {

                    let digest = Algorithm.XXH3_128().createDigest().platform()

                    let data = try Data(contentsOf: URL(fileURLWithPath: photo.url))

                    return digest.digest(input_: data)

                } catch {
                    Log.error("Failed creating checksum", error: error)
                }

If I execute that a IncorrectDereferenceException occurs as follows:

Uncaught Kotlin exception: kotlin.native.IncorrectDereferenceException: Trying to access top level value not marked as @ThreadLocal or @SharedImmutable from non-main thread
    at 0   shared                              0x000000010f091b9d ThrowIncorrectDereferenceException + 93
    at 1   shared                              0x000000010f6ffd9b kfun:com.appmattus.crypto.internal.core.xxh3#XXH3_128bits_reset(com.appmattus.crypto.internal.core.xxh3.XXH3_state_s){}com.appmattus.crypto.internal.core.xxh3.XXH_errorcode + 171
    at 2   shared                              0x000000010f6f7833 kfun:com.appmattus.crypto.internal.core.xxh3.XXH3_128#reset(){} + 435
    at 3   shared                              0x000000010f6f7104 kfun:com.appmattus.crypto.internal.core.xxh3.XXH3_128#<init>(com.appmattus.crypto.Algorithm.XXH3_128){} + 276
    at 4   shared                              0x000000010f2acde5 kfun:com.appmattus.crypto.internal.CoreDigest#create(com.appmattus.crypto.Algorithm){}com.appmattus.crypto.Digest<*> + 18277

It works if I wrap that into DispatchQueue.main.async {} which of course causes my UI to hang.

This relates to Kotlin/Native memory model.

Maybe you can see if you can fix it in a way that it can be used on background threads. :)

opened by AshStefanOltmann 6

XXH3_64 implementation gives incompatible hash values for short input lengths

Some short inputs with 1,2, or 3 bytes lead to different hash values compared to the native reference implementation from https://github.com/Cyan4973/xxHash. The behavior can be reproduced with this unit test https://github.com/dynatrace-oss/hash4j/blob/01e8ed429c61acd7735967b2ba472c80d4616337/src/test/java/com/dynatrace/hash4j/hashing/CrossCheckTest.java#L195 which checks the compatibility with the reference implementation.

opened by oertl 1
Add cryptohash to kmm-awesome GitHub project
Create PR into https://github.com/terrakok/kmm-awesome so the library is better known.

From a cryptohash perspective we already implement various algorithms that have feature requests in the krypto library:

https://github.com/korlibs/korge/issues/628

https://github.com/korlibs/korge/issues/626

https://github.com/korlibs/korge/issues/621
opened by mattmook 0

A collection of Kotlin Multiplatform Mobile cryptographic hashing functions.

Related tags

Overview

crypto

Contributing

License

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Comments

Can't be used in Swift on non-main thread

XXH3_64 implementation gives incompatible hash values for short input lengths

Add cryptohash to kmm-awesome GitHub project

Releases(0.10.1)

0.10.1(Jun 15, 2022)

0.10.0(Mar 7, 2022)

0.9.0(Mar 2, 2022)

0.8.0(Jan 25, 2022)

0.7.0(Jan 6, 2022)

0.6.0(Sep 23, 2021)

0.5.0(Jun 28, 2021)

0.4.0(Jun 3, 2021)

0.3.0(May 26, 2021)

0.2.0(May 24, 2021)

0.1.0(May 9, 2021)

Owner

Appmattus Limited

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