Error in sha1 encryption of oc ios Chinese strings ?,

Error in sha1 encryption of oc ios Chinese strings ?,

I found an oc-version encryption tool on the Internet, but there is a big problem in encrypting Chinese.

Const char * cstr = [self cStringUsingEncoding: encoding];

NSData * data = [NSData dataWithBytes: cstr length: self. length];

Uint8_t digest [CC_SHA1_DIGEST_LENGTH];

CC_SHA1 (data. bytes, data. length, digest );

NSMutableString * result = [NSMutableString stringWithCapacity: CC_SHA1_DIGEST_LENGTH * 2];

For (int I = 0; I <CC_SHA1_DIGEST_LENGTH; I ++ ){

[Result appendFormat: @ "% 02x", digest [I];

}

Return result. uppercaseString;

The above method causes data loss when converting a Chinese string to data.

Const char * cstr = [input cStringUsingEncoding: NSUTF8StringEncoding];

NSData * data = [NSData dataWithBytes: cstr length: input. length];

Change these two sentences

NSData * data = [input dataUsingEncoding: NSUTF8StringEncoding];

You can.

 

Ps, this is because we encounter a string first converted to UTF-8, and the background encountered a direct sha1 encryption instead of utf8.