iOS開發之Objective-c的MD5/SHA1加密算法的實現
- Objective-c實現MD5和SHA1算法相對仍是比較簡單的,能夠直接調用系統的C/C++共享庫來實現調用
- MD5即Message Digest Algorithm 5(信息-摘要算法 5),用於確保信息傳輸完整一致。是計算機普遍使用的雜湊算法之一
- SHA即Secure Hash Algorithm(安全散列算法) 是美國國家安全局 (NSA) 設計,美國國家標準與技術研究院 (NIST) 發佈的一系列密碼散列函數。
-
-
- 使用方式以下:
- MD5加密方式
-
- -(NSString *) md5
- {
- const charchar *cStr = [self UTF8String];
- unsigned char digest[CC_MD5_DIGEST_LENGTH];
- CC_MD5( cStr, strlen(cStr), digest );
-
- NSMutableString *output = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
-
- for(int i = 0; i < CC_MD5_DIGEST_LENGTH; i++)
- [output appendFormat:@"%02x", digest[i]];
-
- return output;
- }
- SHA1加密方式
- - (NSString *) sha1:(NSString *)input
{
const char *cstr = [input cStringUsingEncoding:NSUTF8StringEncoding];
NSData *data = [NSData dataWithBytes:cstr length:input.length];
uint8_t digest[CC_SHA1_DIGEST_LENGTH];
CC_SHA1(data.bytes, data.length, digest);
NSMutableString *output = [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH * 2];
for(int i=0; i<CC_SHA1_DIGEST_LENGTH; i++) {
[output appendFormat:@"%02x", digest[i]];
}
return output;
}
- 固然也能夠結合BASE64來使用,這裏的BASE64編碼使用 GTMBase64實現,須要導入
-
- - (NSString *) sha1_base64
- {
- const charchar *cstr = [self cStringUsingEncoding:NSUTF8StringEncoding];
- NSData *data = [NSData dataWithBytes:cstr length:self.length];
-
- uint8_t digest[CC_SHA1_DIGEST_LENGTH];
-
- CC_SHA1(data.bytes, data.length, digest);
-
- NSData * base64 = [[NSData alloc]initWithBytes:digest length:CC_SHA1_DIGEST_LENGTH];
- base64 = [GTMBase64 encodeData:base64];
-
- NSString * output = [[NSString alloc] initWithData:base64 encoding:NSUTF8StringEncoding];
- return output;
- }
-
- - (NSString *) md5_base64
- {
- const charchar *cStr = [self UTF8String];
- unsigned char digest[CC_MD5_DIGEST_LENGTH];
- CC_MD5( cStr, strlen(cStr), digest );
-
- NSData * base64 = [[NSData alloc]initWithBytes:digest length:CC_MD5_DIGEST_LENGTH];
- base64 = [GTMBase64 encodeData:base64];
-
- NSString * output = [[NSString alloc] initWithData:base64 encoding:NSUTF8StringEncoding];
- return output;
- }
- 經過拓展NSString,實現完整功能,所有代碼
-
- @interface NSString (encrypto)
- - (NSString *) md5;
- - (NSString *) sha1;
- - (NSString *) sha1_base64;
- - (NSString *) md5_base64;
- - (NSString *) base64;
-
- @end
- @implementation NSString (encrypto)
- - (NSString*) sha1
- {
- const charchar *cstr = [self cStringUsingEncoding:NSUTF8StringEncoding];
- NSData *data = [NSData dataWithBytes:cstr length:self.length];
-
- uint8_t digest[CC_SHA1_DIGEST_LENGTH];
-
- CC_SHA1(data.bytes, data.length, digest);
-
- NSMutableString* output = [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH * 2];
-
- for(int i = 0; i < CC_SHA1_DIGEST_LENGTH; i++)
- [output appendFormat:@"%02x", digest[i]];
-
- return output;
- }
-
- -(NSString *) md5
- {
- const charchar *cStr = [self UTF8String];
- unsigned char digest[CC_MD5_DIGEST_LENGTH];
- CC_MD5( cStr, strlen(cStr), digest );
-
- NSMutableString *output = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
-
- for(int i = 0; i < CC_MD5_DIGEST_LENGTH; i++)
- [output appendFormat:@"%02x", digest[i]];
-
- return output;
- }
-
- - (NSString *) sha1_base64
- {
- const charchar *cstr = [self cStringUsingEncoding:NSUTF8StringEncoding];
- NSData *data = [NSData dataWithBytes:cstr length:self.length];
-
- uint8_t digest[CC_SHA1_DIGEST_LENGTH];
-
- CC_SHA1(data.bytes, data.length, digest);
-
- NSData * base64 = [[NSData alloc]initWithBytes:digest length:CC_SHA1_DIGEST_LENGTH];
- base64 = [GTMBase64 encodeData:base64];
-
- NSString * output = [[NSString alloc] initWithData:base64 encoding:NSUTF8StringEncoding];
- return output;
- }
-
- - (NSString *) md5_base64
- {
- const charchar *cStr = [self UTF8String];
- unsigned char digest[CC_MD5_DIGEST_LENGTH];
- CC_MD5( cStr, strlen(cStr), digest );
-
- NSData * base64 = [[NSData alloc]initWithBytes:digest length:CC_MD5_DIGEST_LENGTH];
- base64 = [GTMBase64 encodeData:base64];
-
- NSString * output = [[NSString alloc] initWithData:base64 encoding:NSUTF8StringEncoding];
- return output;
- }
-
- - (NSString *) base64
- {
- NSData * data = [self dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
- data = [GTMBase64 encodeData:data];
- NSString * output = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
- return output;
- }
- @end
- 實現時候不要忘記導入CC相關的庫的頭文件
- CommonCrypto/CommonDigest.h
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