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Decrypt apple-app-site-association in browser

user4771 Published in September 20, 2018, 4:35 pm

I'm building a tool to verify deep links set up with Apple's apple-app-site-association files. In some cases, these files are pkcs7-mime encrypted.

Is there any way currently to decrypt these files entirely on the client? I've researched WebCrypto and similar tools but I can't find a solution.

Essentially, I'd like to replicate the following openssl command in JS:

openssl smime -verify -inform DER -noverify -in apple-app-site-association.p7m

This should successfully output valid JSON, such as:

"applinks": {
    "apps": [],
    "details": [
            "appID": "4MU37S3E4Q.com.couchsurfing.CouchSurfing",
            "paths": [
                        "NOT /people/*/*",
                        "NOT /users/*/*",
                        "NOT /events/*/*",
                        "NOT /events/past",
                        "NOT /events/attending",
                        "NOT /events/organizing",
                        "NOT /events/featured",
                        "NOT /users/confirmation",

Any help is much appreciated!

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