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(Android™) Verify and Unwrap S/MIME, and get Information about CMS SignatureDemonstrates calling the Verify method to verify and unwrap S/MIME. The MIME is restored to the original structure that it would have originally had prior to signing. The Verify method works with both detached signatures, as well as opaque/attached signatures. Calls LastJsonData to get information about the signature(s) that were verified.
// Important: Don't forget to include the call to System.loadLibrary // as shown at the bottom of this code sample. package com.test; import android.app.Activity; import com.chilkatsoft.*; import android.widget.TextView; import android.os.Bundle; public class SimpleActivity extends Activity { private static final String TAG = "Chilkat"; // Called when the activity is first created. @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. CkMime mime = new CkMime(); // Load the signed MIME from a file... boolean success = mime.LoadMimeFile("qa_data/mime/detached_sig.eml"); if (success == false) { Log.i(TAG, mime.lastErrorText()); return; } // Verify the S/MIME and restore the MIME // to the structure/content it had prior to signing. boolean verified = mime.Verify(); if (verified == false) { Log.i(TAG, mime.lastErrorText()); return; } // Examine the details of what was verified. CkJsonObject json = mime.LastJsonData(); json.put_EmitCompact(false); Log.i(TAG, json.emit()); // The code to parse the following JSON (i.e. extract desired information) is shown below.. // { // "pkcs7": { // "verify": { // "certs": [ // { // "issuerCN": "VeriSign Class 1 Public Primary Certification Authority - G3", // "serial": "0702A21A85B84B659E180A6EE6F5A365" // }, // { // "issuerCN": "VeriSign Class 1 Public Primary Certification Authority - G3", // "serial": "008B5B75568454850B00CFAF3848CEB1A4" // }, // { // "issuerCN": "Symantec Class 1 Individual Subscriber CA - G5", // "serial": "619C55C32FF6BD1A7B7E0330D21C8F3C" // } // ], // "digestAlgorithms": [ // "sha1" // ], // "signerInfo": [ // { // "cert": { // "serialNumber": "619C55C32FF6BD1A7B7E0330D21C8F3C", // "issuerCN": "Symantec Class 1 Individual Subscriber CA - G5", // "digestAlgOid": "1.3.14.3.2.26", // "digestAlgName": "SHA1" // }, // "contentType": "1.2.840.113549.1.7.1", // "signingTime": "160428055000Z", // "messageDigest": "2hJJVmO/jtaJV5uCKMFzIkRRvtY=", // "signingAlgOid": "1.2.840.113549.1.1.1", // "signingAlgName": "RSA-PKCSV-1_5", // "authAttr": { // "1.2.840.113549.1.9.3": { // "name": "contentType", // "oid": "1.2.840.113549.1.7.1" // }, // "1.2.840.113549.1.9.5": { // "name": "signingTime", // "utctime": "160428055000Z" // }, // "1.2.840.113549.1.9.4": { // "name": "messageDigest", // "digest": "2hJJVmO/jtaJV5uCKMFzIkRRvtY=" // }, // "1.2.840.113549.1.9.15": { // "der": "MFAwCwYJYIZIAWUDBAECMAoGCCqGSIb3DQMHMA4GCCqGSIb3DQMCAgIAgDANBggqhkiG9w0DAgIBQDAHBgUrDgMCBzANBggqhkiG9w0DAgIBKA==" // }, // "1.3.6.1.4.1.311.16.4": { // "der": "MIG7MIG...7fgMw0hyPPA==" // } // } // } // ] // } // } // } // Use this online tool to generate parsing code from sample JSON: // Generate Parsing Code from JSON CkDtObj signingTime = new CkDtObj(); CkDtObj authAttrSigningTimeUtctime = new CkDtObj(); String issuerCN; String serial; String strVal; String certSerialNumber; String certIssuerCN; String certDigestAlgOid; String certDigestAlgName; String contentType; String messageDigest; String signingAlgOid; String signingAlgName; String authAttrContentTypeName; String authAttrContentTypeOid; String authAttrSigningTimeName; String authAttrMessageDigestName; String authAttrMessageDigestDigest; String authAttr1_2_840_113549_1_9_15Der; String authAttr1_3_6_1_4_1_311_16_4Der; int i = 0; int count_i = json.SizeOfArray("pkcs7.verify.certs"); while (i < count_i) { json.put_I(i); issuerCN = json.stringOf("pkcs7.verify.certs[i].issuerCN"); serial = json.stringOf("pkcs7.verify.certs[i].serial"); i = i + 1; } i = 0; count_i = json.SizeOfArray("pkcs7.verify.digestAlgorithms"); while (i < count_i) { json.put_I(i); strVal = json.stringOf("pkcs7.verify.digestAlgorithms[i]"); i = i + 1; } i = 0; count_i = json.SizeOfArray("pkcs7.verify.signerInfo"); while (i < count_i) { json.put_I(i); certSerialNumber = json.stringOf("pkcs7.verify.signerInfo[i].cert.serialNumber"); certIssuerCN = json.stringOf("pkcs7.verify.signerInfo[i].cert.issuerCN"); certDigestAlgOid = json.stringOf("pkcs7.verify.signerInfo[i].cert.digestAlgOid"); certDigestAlgName = json.stringOf("pkcs7.verify.signerInfo[i].cert.digestAlgName"); contentType = json.stringOf("pkcs7.verify.signerInfo[i].contentType"); json.DtOf("pkcs7.verify.signerInfo[i].signingTime",false,signingTime); messageDigest = json.stringOf("pkcs7.verify.signerInfo[i].messageDigest"); signingAlgOid = json.stringOf("pkcs7.verify.signerInfo[i].signingAlgOid"); signingAlgName = json.stringOf("pkcs7.verify.signerInfo[i].signingAlgName"); authAttrContentTypeName = json.stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".name"); authAttrContentTypeOid = json.stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".oid"); authAttrSigningTimeName = json.stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".name"); json.DtOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".utctime",false,authAttrSigningTimeUtctime); authAttrMessageDigestName = json.stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".name"); authAttrMessageDigestDigest = json.stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".digest"); authAttr1_2_840_113549_1_9_15Der = json.stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.15\".der"); authAttr1_3_6_1_4_1_311_16_4Der = json.stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.3.6.1.4.1.311.16.4\".der"); i = i + 1; } } static { System.loadLibrary("chilkat"); // Note: If the incorrect library name is passed to System.loadLibrary, // then you will see the following error message at application startup: //"The application <your-application-name> has stopped unexpectedly. Please try again." } } |
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