CODEWITHSUNDEEP
androidiosobjective-cbase64sha
Bista
Bista

Reputation: 7903

Implementing Base 64 and SHA

I have tried following code so far:

+(NSString*)encodeString:(NSString*)origString{
    /* Here we can choose the algorithm */
    NSData *keyData = [@"secret_key" dataUsingEncoding:NSUTF8StringEncoding];

    NSData *textData = [origString dataUsingEncoding:NSUTF8StringEncoding];
    uint8_t digest[CC_SHA1_DIGEST_LENGTH] = {0};

    CCHmacContext hmacContext;
    CCHmacInit(&hmacContext, kCCHmacAlgSHA1, keyData.bytes, keyData.length);
    CCHmacUpdate(&hmacContext, textData.bytes, textData.length);
    CCHmacFinal(&hmacContext, digest);

    /* out is HMAC */
    NSData *out = [NSData dataWithBytes:digest length:CC_SHA1_DIGEST_LENGTH];

    /* resultString is Base64 encoded HMAC */
    NSString *resultString = [out base64EncodedString];
    return resultString;
}

This is giving correct result as wanted. But my android and Back-end partner want me to clone following code into objective-c:

private String encryptString(String origString) {
    String encryptedString = "";
    Cipher cipher = null;
    byte[] encoded = null;
    byte[] rawEnc =null;
    try {
        //Code which is working
        cipher = Cipher.getInstance("AES/CBC/PKCS5Padding", "SunJCE");
        SecretKeySpec key = new SecretKeySpec(SECRET_KEY.getBytes("UTF-8"), "AES");
        cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(INITIALIZATIO_VECTOR.getBytes("UTF-8")));
        rawEnc = cipher.doFinal(origString.getBytes("UTF-8"));
        encoded = Base64.encodeBase64(rawEnc);
        encryptedString = new String(encoded, "UTF-8");

    } catch (NoSuchAlgorithmException e) {
        System.out.println("No Such Algorithm Exception:" + e.getMessage());
    } catch (NoSuchProviderException e) {
        System.out.println("No Such Provider Exception:" + e.getMessage());
    } catch (NoSuchPaddingException e) {
        System.out.println("No Such Padding Exception:" + e.getMessage());
    } catch (InvalidKeyException | InvalidAlgorithmParameterException
             | UnsupportedEncodingException e) {
        System.out.println("Exception:" + e.getMessage());
    } catch (Exception e) {
        System.out.println("Exception:" + e.getMessage());
    }
    return encryptedString;
}
private static final String SECRET_KEY = "secret_key";
private static final String INITIALIZATIO_VECTOR = "123456";

}

And android's output is different than iOS and is as required by back-end developer. So, I have to convert code according to theirs.

The only things differs is INITIALIZATIO_VECTOR.

I want above code in objective-C.

Upvotes: 0

Views: 85

Answers (1)

zaph
zaph

Reputation: 112875

The question contains: "Implementing Base 64".

There is no need on iOS, just use the Apple NSData Base64 APIs:

Create a Base-64 encoded NSString from the receiver's contents using the given options:

- base64EncodedStringWithOptions:

Returns a data object initialized with the given Base-64 encoded data:

- initWithBase64EncodedData:options:

Returns a data object initialized with the given Base-64 encoded string:

- initWithBase64EncodedString:options:

etc.

Upvotes: 1

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