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POErlang Crypto Verify for Android Purchase Data
 

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    <p>I am using the crypto:verify which checks the google play purchase information, to be an "bad argument exception". I want you to know how.</p> <pre><code>OrderData = &lt;&lt;"{\"orderId\":\"12999763169054705758.1323507343902706\",\"packageName\":\"...\",\"productId\":\"item1\",\"purchaseTime\":1385090498734,\"purchaseState\":0,\"developerPayload\":\"DEVELOPER_PAYMENT\",\"purchaseToken\":\"...\"}"&gt;&gt;), PublicKeyString = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAs4WYUM+LiABp/fp5YHngKjpCslKyhMIosBND3nbgFyrt2bv7Bd8nVl80kOWHPWR8HLUH5u+r8MP9KF7klG8OiWk1GROgs3pHB5BNl2TdOIT6rtnUJXslFqlnGh5IlpShJVUIrO2ADbXmwsN3AviZBw0ZjctfjK5t1UOvptSDGolBl5UtoVZ/TNjpa6QtMPtccGRDNmXAWFrEhTMDLdH+EPeapAmxi/rY0RBDMdobj1UtQdFA+iGlp6adbkjW7xFGWxyjS+dKFbn/jULxILfLVQ3XpGZXQMGW3FvyAvuZBM1ZWHrM4t0aQZGSHsvCste7hMe97lozsuXsb8JdfRjdO..."), DataSignature = &lt;&lt;"MxauTspbl/1pB8836+sgM8Jw//auJ2VzIhV4JlxAHNJQ2klA20F8m2d/+60Px0MPCPhU478ezn4Jsy168RKjz+dTUjjwgN118uTO8aKjQ8DVwVNVR9FzljFSou2V9hY4TitzEyhl6Iy5B7GqReRsbd4b1YajLkuwRKIt4vSBlamqjVBBbgqGuq8ppRPp15wruRRMJdVHlZXXXmiDw1pd+nr7z9CXVZ0nAyivy9Tq8W1clKUmtHdQt3NtOR4kXiFfiu6+IOAedn1uwV2akfBTd5UD0/PbJeXy8sNWF/2yjzCGbn9HZJqGBG2R9HSehcolvhGI7mAwam8nt7ljkO0Gww=="&gt;&gt;), SizedBinary = fun(Binary) -&gt; &lt;&lt;(size(Binary)):32/integer, Binary/binary&gt;&gt; end, Hash = crypto:hash(sha, OrderData), PublicKey = base64:decode(PublicKeyString), %% (is valid ???) Signature1 = base64:decode(DataSignature), %% (is valid ???) crypto:rsa_verify(SizedBinary(Hash), Signature1, PublicKey). ** exception error: bad argument in function crypto:rsa_verify_nif/4 </code></pre>
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    1. COThe Signature1 parameter to `rsa_verify` should be a SizedBinary as well.
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    2. CO`PubKeyLen = 65537, PublicKey = [ <<PubKeyLen:32/integer-big>>, ?PublicKeyModulus ], crypto:verify(rsa , sha, ?OrderData, Signature, PublicKey). ok`
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