Is there a way I can check the md5 checksum for a ...

# ktor

[spierce7]

Is there a way I can check the md5 checksum for a file I downloaded with ktor?

[Matteo Mirk]

You want to to it in your program or in the shell? By “downloaded” you mean that you used ktor client?

[Matteo Mirk]

Anyway, if you’re targeting Kotlin/JVM you can use java.security.MessageDigest to calculate the md5

[spierce7]

I’m downloading a large file with the ktor streaming api, and I’d like to calculate a checksum as I download

[Matteo Mirk]

are you compiling for the JVM? If so just use MessageDigest and every time you receive a chunk of byte[] call digest.update(bytes) . When you’re finished call digest.digest() and you’re done, maybe convert it to string if you need to print it.

[spierce7]

it’s multiplatform 😞

[Matteo Mirk]

Okay then, you can either look for a message digest/checksum MPP lib or declare a common interface and then bind actual implementations to platform-specific libs, for example a checksum JS lib, a checksum C lib, etc.

[Matteo Mirk]

(jeez, this discussion took 2 days to this point… you could have mentioned MPP from the beginning 🙂)