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With smime message we have 8 type:

1/ Detached signature message without signing cert inside

2/ Detached signature message with signing cert inside

3/ Opaque signature message without signing cert inside

4/ Opaque signature message with signing cert inside

5/ Encrypt Detached signature message without signing cert inside

6/ Encrypt Detached signature message with signing cert inside

7/ Encrypt Opaque signature message without signing cert inside

8/ Encrypt Opaque signature message with signing cert inside

I try to parse all of them using chilkasoft, this is my code (IOS):

(MimeInfo )decryptMime:(NSString )mimeText ownerAccount:(MailAccount )account signatureCertificate:(PublicCertificate ) signatureCertificate error : (NSError * __autoreleasing *) error {

BOOL isEncrypted = NO;
BOOL isSigned = NO;
BOOL isPassVerify = NO;
NSMutableArray *signingCerts = [NSMutableArray array];
CkoMime *mime = [[CkoMime alloc] init];
if (![mime UnlockComponent: UNLOCK_STRING]) {
    if (error) {
        *error = [[NSError alloc] initWithDomain:SMIME code:0 userInfo:@{NSLocalizedDescriptionKey : @"Unlock Fail"}];
    }
    return [[MimeInfo alloc] initWithPlainText:nil html:nil archieveAt:nil attachments:nil isSigned:isSigned isEncrypted:isEncrypted isPassVerify:NO signingCertificate:nil];
}

if (![mime LoadMime:mimeText]) {
    if (error) {
        *error = [[NSError alloc] initWithDomain:SMIME_DECRYPT_DOMAIN code:0 userInfo:@{NSLocalizedDescriptionKey : @"Wrong Mime"}];
    }
    return [[MimeInfo alloc] initWithPlainText:nil html:nil archieveAt:nil attachments:nil isSigned:isSigned isEncrypted:isEncrypted isPassVerify:NO signingCertificate:nil];
}
NSString *archiveAt = [mime GetHeaderField:ARCHIEVED_AT];
if (mime.IsSigned) {
    isSigned = YES;
}
if (mime.IsEncrypted) {
    isEncrypted = YES;
}
if (isEncrypted) {
    if (!account.certificate) {
        if (error) {
            *error = [[NSError alloc] initWithDomain:SMIME_DECRYPT_DOMAIN code:1 userInfo:@{NSLocalizedDescriptionKey : @"No decrypted certificate found"}];
        }
        return [[MimeInfo alloc] initWithPlainText:nil html:nil archieveAt:nil attachments:nil isSigned:isSigned isEncrypted:isEncrypted isPassVerify:NO signingCertificate:nil];
    }
    CkoCert *encryptedCert = [[CkoCert alloc] init];
    if (![encryptedCert LoadPfxData:account.certificate.pfx password:account.certificate.password]) {
        if (error) {
            *error = [[NSError alloc] initWithDomain:SMIME_DECRYPT_DOMAIN code:2 userInfo:@{NSLocalizedDescriptionKey : @"Wrong decrypted certificate"}];
        }
        return [[MimeInfo alloc] initWithPlainText:nil html:nil archieveAt:nil attachments:nil isSigned:isSigned isEncrypted:isEncrypted isPassVerify:NO signingCertificate:nil];
    }

    if (![mime DecryptUsingCert:encryptedCert]) {
        if (error) {
            *error = [[NSError alloc] initWithDomain:SMIME_DECRYPT_DOMAIN code:3 userInfo:@{NSLocalizedDescriptionKey : @"Decrypt fail"}];
        }
        return [[MimeInfo alloc] initWithPlainText:nil html:nil archieveAt:nil attachments:nil isSigned:isSigned isEncrypted:isEncrypted isPassVerify:NO signingCertificate:nil];
    }

    for (int i = 0; i < [mime NumSignerCerts].intValue; i ++) {
        CkoCert *cert = [mime GetSignerCert:[NSNumber numberWithInt:i]];
        NSData *data = [cert ExportCertDer];
        if (signatureCertificate && !isPassVerify) {
            if ([data isEqualToData:signatureCertificate.cert]) {
                isPassVerify = YES;
            }
        }
        [signingCerts addObject:data];
    }
    isSigned = signingCerts.count > 0;
}
if (mime.IsSigned) {
    isSigned = YES;
    CkoCert *cert = nil;
    if (signatureCertificate) {
        cert =[[CkoCert alloc] init];
        if ([cert LoadFromBinary:signatureCertificate.cert]) {
            [mime SetVerifyCert:cert];
        }
    }
    if (![mime Verify]) {
        if (error) {
            *error = [[NSError alloc] initWithDomain:SMIME_DECRYPT_DOMAIN code:4 userInfo:@{NSLocalizedDescriptionKey : @"No signing certificate found"}];
        }
    }
    isPassVerify = NO;
    for (int i = 0; i < [mime NumSignerCerts].intValue; i ++) {
        CkoCert *cert = [mime GetSignerCert:[NSNumber numberWithInt:i]];
        NSData *data = [cert ExportCertDer];
        if (signatureCertificate && !isPassVerify) {
            if ([data isEqualToData:signatureCertificate.cert]) {
                isPassVerify = YES;
            }
        }
        [signingCerts addObject:data];
    }
}
NSLog(@"%@", [mime GetMime]);
NSArray *certs = nil;
if (signingCerts.count > 0) {
    certs = [NSArray arrayWithArray:signingCerts];
}
MimeInfo *result = [self parseFromDecryptMessageCkoMine:mime];
[result setIsSigned:isSigned isEncrypted:isEncrypted isPassVerify:isPassVerify signingCerts:certs archivedAt:archiveAt];
return result;

}

Result

1/ If I have the private encrypted certificate and public signing certificate. I can get the content and verify and trusted of all the messages

2/ If I have the private encrypted certificate only. I can't either get the content nor verify the trusted of message 3,5,7

3/ If I don't have any certificate. I can get the content of message 1,2,4 (We need to get the content of message 3 also). With the message 5,6,7,8 we don't know it is signed or not ???

Please refer link for the smime messages that i woking on

https://drive.google.com/open?id=0B6GCW3Gz34lFLXFPb2FEWDh4Mk0&authuser=0

This question is marked "community wiki".

asked Dec 09 '14 at 23:52

DUNGSI's gravatar image

DUNGSI
114

edited Dec 09 '14 at 23:54

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Asked: Dec 09 '14 at 23:52

Seen: 982 times

Last updated: Dec 09 '14 at 23:54

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