//
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// GTMBase64.h
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//
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// Copyright 2006-2008 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy
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// of the License at
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//
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// GitHub地址 https://github.com/penghero/PGGCrypto.git
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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//
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/*
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Base64加密方式
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Base64是一种加密方法，可逆的加密。
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Base64中的可打印字符包括字母A-Z、a-z、数字0-9，这样共有62个字符。/ + 填充 =
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echo -n BC|base64
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base64 ABC -o 123.txt
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base64 -D 123.txt -o uio.txt
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Base64 iOS7之后加入系统库里的
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类方法加锁，对象方法解密
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1) 字符串转化为base64字符串
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NSString * string = @"ABC";
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NSData * data = [string dataUsingEncoding:NSUTF8StringEncoding];
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NSString * base64String = [data
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base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
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NSLog(@"%@",base64String);
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2)加密后的data转化成加密前的字符串
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//将普通的data转化为加密后的data
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NSData * base64Data = [data base64EncodedDataWithOptions:0];
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//加密后的Data转换为普通data
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NSData * data2 = [[NSData alloc] initWithBase64EncodedData:base64Data options:0];
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NSString * string2 = [[NSString alloc] initWithData:data2 encoding:NSUTF8StringEncoding];
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NSLog(@"%@",string2);
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3)加密图片
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UIImage * image = [UIImage imageNamed:@"111"];
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NSData * data = UIImagePNGRepresentation(image);
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NSString * base64String = [data base64EncodedStringWithOptions:0];
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//解密图片
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NSData * decodeData = [[NSData alloc] initWithBase64EncodedString:base64String options:0];
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UIImage * decodeImage = [[UIImage alloc] initWithData:decodeData];
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*/
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#import <Foundation/Foundation.h>
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#import "GTMDefines.h"
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// GTMBase64
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//
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/// Helper for handling Base64 and WebSafeBase64 encodings
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//
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/// The webSafe methods use different character set and also the results aren't
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/// always padded to a multiple of 4 characters. This is done so the resulting
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/// data can be used in urls and url query arguments without needing any
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/// encoding. You must use the webSafe* methods together, the data does not
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/// interop with the RFC methods.
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//
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@interface GTMBase64 : NSObject
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//
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// Standard Base64 (RFC) handling
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//
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// encodeData:
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//
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/// Base64 encodes contents of the NSData object.
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//
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/// Returns:
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/// A new autoreleased NSData with the encoded payload. nil for any error.
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//
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+(NSData *)encodeData:(NSData *)data;
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// decodeData:
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//
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/// Base64 decodes contents of the NSData object.
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//
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/// Returns:
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/// A new autoreleased NSData with the decoded payload. nil for any error.
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//
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+(NSData *)decodeData:(NSData *)data;
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// encodeBytes:length:
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//
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/// Base64 encodes the data pointed at by |bytes|.
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//
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/// Returns:
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/// A new autoreleased NSData with the encoded payload. nil for any error.
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//
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+(NSData *)encodeBytes:(const void *)bytes length:(NSUInteger)length;
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// decodeBytes:length:
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//
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/// Base64 decodes the data pointed at by |bytes|.
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//
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/// Returns:
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/// A new autoreleased NSData with the encoded payload. nil for any error.
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//
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+(NSData *)decodeBytes:(const void *)bytes length:(NSUInteger)length;
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// stringByEncodingData:
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//
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/// Base64 encodes contents of the NSData object.
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//
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/// Returns:
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/// A new autoreleased NSString with the encoded payload. nil for any error.
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//
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+(NSString *)stringByEncodingData:(NSData *)data;
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// stringByEncodingBytes:length:
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//
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/// Base64 encodes the data pointed at by |bytes|.
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//
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/// Returns:
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/// A new autoreleased NSString with the encoded payload. nil for any error.
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//
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+(NSString *)stringByEncodingBytes:(const void *)bytes length:(NSUInteger)length;
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// decodeString:
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//
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/// Base64 decodes contents of the NSString.
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//
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/// Returns:
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/// A new autoreleased NSData with the decoded payload. nil for any error.
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//
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+(NSData *)decodeString:(NSString *)string;
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//
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// Modified Base64 encoding so the results can go onto urls.
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//
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// The changes are in the characters generated and also allows the result to
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// not be padded to a multiple of 4.
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// Must use the matching call to encode/decode, won't interop with the
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// RFC versions.
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//
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// webSafeEncodeData:padded:
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//
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/// WebSafe Base64 encodes contents of the NSData object. If |padded| is YES
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/// then padding characters are added so the result length is a multiple of 4.
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//
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/// Returns:
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/// A new autoreleased NSData with the encoded payload. nil for any error.
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//
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+(NSData *)webSafeEncodeData:(NSData *)data
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padded:(BOOL)padded;
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// webSafeDecodeData:
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//
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/// WebSafe Base64 decodes contents of the NSData object.
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//
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/// Returns:
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/// A new autoreleased NSData with the decoded payload. nil for any error.
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//
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+(NSData *)webSafeDecodeData:(NSData *)data;
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// webSafeEncodeBytes:length:padded:
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//
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/// WebSafe Base64 encodes the data pointed at by |bytes|. If |padded| is YES
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/// then padding characters are added so the result length is a multiple of 4.
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//
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/// Returns:
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/// A new autoreleased NSData with the encoded payload. nil for any error.
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//
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+(NSData *)webSafeEncodeBytes:(const void *)bytes
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length:(NSUInteger)length
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padded:(BOOL)padded;
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// webSafeDecodeBytes:length:
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//
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/// WebSafe Base64 decodes the data pointed at by |bytes|.
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//
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/// Returns:
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/// A new autoreleased NSData with the encoded payload. nil for any error.
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//
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+(NSData *)webSafeDecodeBytes:(const void *)bytes length:(NSUInteger)length;
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// stringByWebSafeEncodingData:padded:
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//
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/// WebSafe Base64 encodes contents of the NSData object. If |padded| is YES
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/// then padding characters are added so the result length is a multiple of 4.
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//
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/// Returns:
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/// A new autoreleased NSString with the encoded payload. nil for any error.
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//
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+(NSString *)stringByWebSafeEncodingData:(NSData *)data
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padded:(BOOL)padded;
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// stringByWebSafeEncodingBytes:length:padded:
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//
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/// WebSafe Base64 encodes the data pointed at by |bytes|. If |padded| is YES
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/// then padding characters are added so the result length is a multiple of 4.
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//
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/// Returns:
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/// A new autoreleased NSString with the encoded payload. nil for any error.
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//
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+(NSString *)stringByWebSafeEncodingBytes:(const void *)bytes
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length:(NSUInteger)length
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padded:(BOOL)padded;
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// webSafeDecodeString:
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//
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/// WebSafe Base64 decodes contents of the NSString.
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//
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/// Returns:
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/// A new autoreleased NSData with the decoded payload. nil for any error.
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//
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+(NSData *)webSafeDecodeString:(NSString *)string;
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@end
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