How to Encrypt and Decrypt string using Cryptlib Library in Objective C?
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How to Encrypt and Decrypt string using Cryptlib Library in Objective C?
I am able to do encrypt string but not able to do decrypt the same encrypted string.
Plzzz help if anyone use the library.
NSString *str = @"Gitesh"; NSData *strdata00 = [[StringEncryption alloc]encrypt:[str dataUsingEncoding:NSUTF8StringEncoding] key:@"ItDept#!106" iv:@"EdpDept#!106"]; NSString *usernameencrypted_str = [strdata00 base64EncodedString]; NSData *strdata01 = [[StringEncryption alloc]decrypt:[usernameencrypted_str dataUsingEncoding:NSUTF8StringEncoding] key:@"ItDept#!106" iv:@"EdpDept#!106"]; NSString *decryptstr = [strdata01 base64EncodedStringWithOptions:0]; ******* not able to do decrypt the same encrypted string NSLog(@"decryptstr = %@",decryptstr);
– shirish
Aug 9 at 9:15
2 Answers
2
Try to use AESCrypt-ObjC instead of Cryptlib Library.
Installation
Add this line to your class:
#import "AESCrypt.h"
Usage
NSString *message = @"top secret message";
NSString *password = @"p4ssw0rd";
Encrypting
NSString *encryptedData = [AESCrypt encrypt:message password:password];
Decrypting
NSString *message = [AESCrypt decrypt:encryptedData password:password];
Hope this will help.
No I have to integrate Cryptlib library for encryption.bcz my back end team use same library for encryption and decryption.it works well in android also.only problem in iOS. I stuck here since 2 week.plzzz help me
– shirish
Aug 9 at 9:04
@shirish would you please provide the code you have tried?
– Faysal Ahmed
Aug 9 at 9:09
NSString str = @"Gitesh"; NSData *strdata00 = [[StringEncryption alloc]encrypt:[str dataUsingEncoding:NSUTF8StringEncoding] key:@"ItDept#!106" iv:@"EdpDept#!106"]; NSString *usernameencrypted_str = [strdata00 base64EncodedString]; NSData *strdata01 = [[StringEncryption alloc]decrypt:[usernameencrypted_str dataUsingEncoding:NSUTF8StringEncoding] key:@"ItDept#!106" iv:@"EdpDept#!106"]; NSString *decryptstr = [strdata01 base64EncodedStringWithOptions:0]; **** not able to do decrypt the same encrypted string** NSLog(@"decryptstr = %@",decryptstr);
– shirish
Aug 9 at 9:15
What kind to an app you tried to build. If its a Messaging type app then you will use AES encryption and decryption. AES perfectly worked for all platform.
– Faysal Ahmed
Aug 9 at 9:48
Its Goverment app used for Bill payment purpose.need to use a library which is compatible with android , .net & ios
– shirish
Aug 9 at 9:52
I got the solution for you. You can use Cross-Platform-AES instead of Cross-platform-AES-encryption.
Both are working same but Cross-Platform-AES have some extra processing that helps to solve this issue and the implementation is so simple.
NSString *str = @"Gitesh";
NSString *enString = [[CryptLib alloc] encryptPlainText:str key:@"ItDept#!106" iv:@"EdpDept#!106"];
// Encrypted text: ThPGsOjk05yuKxaD7EfU8w==
NSString *drString = [[CryptLib alloc] decryptCipherText:enString key:@"ItDept#!106" iv:@"EdpDept#!106"];
NSLog(@"decryptstr = %@",drString); //Gitesh
The small change needs to change in CryptLib.m class decryptCipherText:(NSString *)ciperText key:(NSString *)key iv:(NSString *)iv method
CryptLib.m
decryptCipherText:(NSString *)ciperText key:(NSString *)key iv:(NSString *)iv
use this:
return [[NSString alloc] initWithData:[[CryptLib alloc] decrypt:[[NSData alloc] initWithBase64EncodedString:ciperText options:NSDataBase64DecodingIgnoreUnknownCharacters] key:[[CryptLib alloc] sha256:key length:32] iv:iv] encoding:NSUTF8StringEncoding];
instead of :
return [[NSString alloc] initWithData:[[CryptLib alloc] decrypt:[[NSData alloc] initWithBase64EncodedString:ciperText options:NSDataBase64DecodingIgnoreUnknownCharacters] key:[[CryptLib alloc] sha256:key length:32] iv:[[CryptLib alloc] generateRandomIV16]] encoding:NSUTF8StringEncoding];
Sir its working but my backend team don't convert the key They take Key as string.so when I hit the api using above code getting no response
– shirish
Aug 9 at 12:48
please try to use the same library on your server. It would be simple change I think.
– Faysal Ahmed
Aug 9 at 12:50
Can u share ur mail id.
– shirish
Aug 10 at 3:34
This answer is solved your problem as you said in the first comment. So you should accept this answer.
– Faysal Ahmed
Aug 10 at 4:13
Plz check ur mail id
– shirish
Aug 10 at 8:59
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Would you please provide the code you have tried to implement this?
– Faysal Ahmed
Aug 9 at 5:49