Objective-C
Objective-C
Verify and Unwrap S/MIME, and get Information about CMS Signature
See more MIME Examples
Demonstrates 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.
Chilkat Objective-C Downloads
#import <CkoMime.h>
#import <CkoJsonObject.h>
#import <CkoDtObj.h>
#import <NSString.h>
BOOL success = NO;
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
CkoMime *mime = [[CkoMime alloc] init];
// Load the signed MIME from a file...
success = [mime LoadMimeFile: @"qa_data/mime/detached_sig.eml"];
if (success == NO) {
NSLog(@"%@",mime.LastErrorText);
return;
}
// Verify the S/MIME and restore the MIME
// to the structure/content it had prior to signing.
BOOL verified = [mime Verify];
if (verified == NO) {
NSLog(@"%@",mime.LastErrorText);
return;
}
// Examine the details of what was verified.
CkoJsonObject *json = [[CkoJsonObject alloc] init];
[mime GetLastJsonData: json];
json.EmitCompact = NO;
NSLog(@"%@",[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
CkoDtObj *signingTime = [[CkoDtObj alloc] init];
CkoDtObj *authAttrSigningTimeUtctime = [[CkoDtObj alloc] init];
NSString *issuerCN = 0;
NSString *serial = 0;
NSString *strVal = 0;
NSString *certSerialNumber = 0;
NSString *certIssuerCN = 0;
NSString *certDigestAlgOid = 0;
NSString *certDigestAlgName = 0;
NSString *contentType = 0;
NSString *messageDigest = 0;
NSString *signingAlgOid = 0;
NSString *signingAlgName = 0;
NSString *authAttrContentTypeName = 0;
NSString *authAttrContentTypeOid = 0;
NSString *authAttrSigningTimeName = 0;
NSString *authAttrMessageDigestName = 0;
NSString *authAttrMessageDigestDigest = 0;
NSString *authAttr1_2_840_113549_1_9_15Der = 0;
NSString *authAttr1_3_6_1_4_1_311_16_4Der = 0;
int i = 0;
int count_i = [[json SizeOfArray: @"pkcs7.verify.certs"] intValue];
while (i < count_i) {
json.I = [NSNumber numberWithInt: 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"] intValue];
while (i < count_i) {
json.I = [NSNumber numberWithInt: i];
strVal = [json StringOf: @"pkcs7.verify.digestAlgorithms[i]"];
i = i + 1;
}
i = 0;
count_i = [[json SizeOfArray: @"pkcs7.verify.signerInfo"] intValue];
while (i < count_i) {
json.I = [NSNumber numberWithInt: 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" bLocal: NO dt: 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" bLocal: NO dt: 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;
}