#import <CommonCrypto/CommonCryptor.h>
#import <CommonCrypto/CommonDigest.h>
#import <CommonCrypto/CommonKeyDerivation.h>

#import "Shared.h"

@implementation Shared

+ (NSString *) toHex:(NSData *)nsdata {
    // Copied from: https://riptutorial.com/ios/example/18979/converting-nsdata-to-hex-string
    const unsigned char *bytes = (const unsigned char *)nsdata.bytes;
    NSMutableString *hex = [NSMutableString new];
    for (NSInteger i = 0; i < nsdata.length; i++) {
        [hex appendFormat:@"%02x", bytes[i]];
    }
    return [hex copy];
}

+ (NSData *) fromHex: (NSString *)string {
    NSMutableData *data = [[NSMutableData alloc] init];
    unsigned char whole_byte;
    char byte_chars[3] = {'\0','\0','\0'};
    for (int i = 0; i < ([string length] / 2); i++) {
        byte_chars[0] = [string characterAtIndex:i*2];
        byte_chars[1] = [string characterAtIndex:i*2+1];
        whole_byte = strtol(byte_chars, NULL, 16);
        [data appendBytes:&whole_byte length:1];
    }
    return data;
}

@end