RSA+Base64之NSString+Base64

新建NSData+Base64扩展，代码如下：

//  NSString+Base64.h

//  rsa

//

//  Created by wzk on 2017/12/29.

//  Copyright © 2017年 lihe. All rights reserved.

//

#import

@interfaceNSString (Base64)

+ (NSString*)stringWithBase64EncodedString:(NSString*)string;

- (NSString*)base64EncodedStringWithWrapWidth:(NSUInteger)wrapWidth;

- (NSString*)base64EncodedString;

- (NSString*)base64DecodedString;

- (NSData*)base64DecodedData;

@end

//

//  NSString+Base64.m

//  rsa

//

//  Created by wzk on 2017/12/29.

//  Copyright © 2017年 lihe. All rights reserved.

//

#import "NSString+Base64.h"

#import "NSData+Base64.h"

@implementationNSString (Base64)

+ (NSString*)stringWithBase64EncodedString:(NSString*)string

{

    NSData *data = [NSData dataWithBase64EncodedString:string];

    if(data)

    {

        NSString *result = [[self alloc] initWithData:data encoding:NSUTF8StringEncoding];

#if !__has_feature(objc_arc)

        [result autorelease];

#endif

        returnresult;

    }

    return nil;

}

- (NSString*)base64EncodedStringWithWrapWidth:(NSUInteger)wrapWidth

{

    NSData *data = [self dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];

    return [data base64EncodedStringWithWrapWidth:wrapWidth];

}

- (NSString*)base64EncodedString

{

    NSData *data = [self dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];

    return [data base64EncodedString];

}

- (NSString*)base64DecodedString

{

    return [NSString stringWithBase64EncodedString:self];

}

- (NSData*)base64DecodedData

{

    return [NSData dataWithBase64EncodedString:self];

}

@end