An NSString subclass main for use with encrypted strings. For an article at www.iCodeBlog.com

ICBEncryptedString.m

#import "MaaSEncryptedString.h"
#import "NSString+Helper.h"

@implementation MaaSEncryptedString

+(NSString*)encryptedString:(NSString*)string {
    
    return [[NSString stringWithFormat:@"%@", [string SHA1]];
}

+(id)encryptedStringWithString:(NSString *)string {
    
    return [[[MaaSEncryptedString alloc] initWithString:string] autorelease];
}

-(id)initWithString:(NSString*)string {

    if(self = [self init]) {
        
        _backingStore = [[MaaSEncryptedString encryptedString:string] copy];
    }

    return self;
}

-(void)dealloc {

    [_backingStore release];
    [super dealloc];
}

-(NSUInteger)length {
    
    return [_backingStore length];
}

-(unichar)characterAtIndex:(NSUInteger)index {
    
    return [_backingStore characterAtIndex:index];
}

@end