Ruby

Validate a .pkpass Archive

See more Digital Signatures Examples

Opens a .pkpass archive (which is just a .zip renamed to .pkpass) and validates the contents. The hashes in the manifest are compared with the computed hash values for each individual file. If all computed hash values match, then the signature is verified. Ruby

require 'chilkat'

success = false

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

crypt = Chilkat::CkCrypt2.new()
zip = Chilkat::CkZip.new()

success = zip.OpenZip("qa_data/pkpass/invalid.pkpass")
if (success == false)
    print zip.lastErrorText() + "\n";
    exit
end

# Get the contents of the manifest.json file, which contains something like this:

# {
#   "icon.png" : "0296b01347b3173e98438a003b0e88986340b2d8",
#   "logo.png" : "25de09e2d3b01ce1fe00c2ca9a90a2be1aaa05cf",
#   "icon@2x.png" : "5afd9585b08c65fdf105a90c8bd643407cba2787",
#   "pass.json" : "145ea5a5db784fff485126c77ecf7a1fc2a88ee7",
#   "strip@2x.png" : "468fa7bc93e6b55342b56fda09bdce7c829d7d46",
#   "strip.png" : "736d01f84cb73d06e8a9932e43076d68f19461ff"
# }

ent = Chilkat::CkZipEntry.new()
success = zip.EntryOf("manifest.json",ent)
if (success == false)
    print zip.lastErrorText() + "\n";
    exit
end

# Get the exact content of the manifest.json for later signature verification.
bdManifest = Chilkat::CkBinData.new()
success = ent.UnzipToBd(bdManifest)

json = Chilkat::CkJsonObject.new()
json.put_EmitCompact(false)
json.Load(ent.unzipToString(0,"utf-8"))
print json.emit() + "\n";

# For each file in the JSON, get the filename and hex hash value.
crypt.put_EncodingMode("hexlower")
crypt.put_HashAlgorithm("sha1")

someHashesFailed = false

sbHashHex = Chilkat::CkStringBuilder.new()
bdFileData = Chilkat::CkBinData.new()
numMembers = json.get_Size()
i = 0
while i < numMembers
    filename = json.nameAt(i)
    sbHashHex.Clear()
    sbHashHex.Append(json.stringAt(i))

    success = zip.EntryOf(filename,ent)
    if (success == false)
        print zip.lastErrorText() + "\n";
        exit
    end

    # Get the data for this file.
    bdFileData.Clear()
    success = ent.UnzipToBd(bdFileData)

    computedHashHex = crypt.hashBdENC(bdFileData)
    if (sbHashHex.ContentsEqual(computedHashHex,false) == false)
        print "Computed hash does not match stored hash for " + filename + "\n";
        print "  computed: " + computedHashHex + "\n";
        print "  stored:   " + sbHashHex.getAsString() + "\n";
        someHashesFailed = true
    else
        print "hash verified for " + filename + "(" + computedHashHex + ")" + "\n";
    end

    i = i + 1
end

if (someHashesFailed == true)
    print "Some hashes failed." + "\n";
    exit
end

# Let's verify the signature..
# First get the signature.
success = zip.EntryOf("signature",ent)
if (success == false)
    print zip.lastErrorText() + "\n";
    exit
end

bdSignature = Chilkat::CkBinData.new()
success = ent.UnzipToBd(bdSignature)

# Show the contents of the signature in base64 encoding.
print "Signature:" + "\n";
print bdSignature.getEncoded("base64_mime") + "\n";
print "----" + "\n";

# Verify the signature against the manifest.json
crypt.put_EncodingMode("base64")
verified = crypt.VerifyBdENC(bdManifest,bdSignature.getEncoded("base64"))
if (verified == false)
    print crypt.lastErrorText() + "\n";
end

print "signature verified = " + verified.to_s() + "\n";