I’m writing a shopify function for applying discounts to the cart items. I want to send some data through the cart attributes to the shopify function which involves a RSA signature of the cart items using a private key. I want to verify this signature in the Shopify function using the public key. I’…

Hi @sriram-1 – Message signing is the only secure way of doing this, and currently there isn’t a mechanism for JavaScript/Javy to use crypto in a way that fits within our instruction limits. As mentioned in our docs , cryptographic hashes, such as SHA implemented in JavaScript, are unlikely to execu…

@Anonymous I actually did a Go implementation of this function and compiled it to .wasm using tinygo. I was able to get the file size under 256KB but the instruction count went to 71M. Thus, instruction count limit exceeded in Javascript as well as Go implementations. How sure can I be that this wil…

I know of several partners successfully doing crypto operations in Rust. I’m surprised TinyGo is that high though. What is your instruction count without the message signature verification? What hashing algorithm are you using?

You might check the compiler options I’m using here, if you haven’t already: https://github.com/nickwesselman/polyglot-functions/blob/main/app/extensions/order-discount-golang/build.sh

The instruction count came close to 72M. And yes, I’m using the same compiler options that you pointed me to. $ cat input1.json | shopify app function run Benchmark Results Name: function.wasm Linear Memory Usage: 512KB Instructions: 71.539465M Size: 242KB I’m doing json.Unmarshal and…

Thanks for this suggestion, it worked. The instruction count came down to 1M. The binary size also has come down.

How to verify the caller and contents in typescript based Shopify Function(restrictions due to Javy)

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Nick_Wesselman May 31, 2024, 4:22pm 7

What is the instruction count without the message signing?

RSA/SHA256 is pretty heavy, what if you just use a SHA-1 HMAC?

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How to verify the caller and contents in typescript based Shopify Function(restrictions due to Javy)

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