SHAMessageDigest Class Reference Inherits from NSObject Declared in SHAMessageDigest.h Overview Class holds secure one-way hash functions that take arbitrary-sized data and output a fixed-length hash value. – updateWithString: Accumulate string data chunk. - (void)updateWithString:(NSString *)string Discussion Accumulate string data chunk. Declared In SHAMessageDigest.h – update: Accumulate raw data chunk. - (void)update:(NSData *)data Discussion Accumulate raw data chunk. Declared In SHAMessageDigest.h – final Compute message digest with accumulated data chunks. - (unsigned char *)final Return Value pointer to the internal buffer that holds the message digest value. Discussion Compute message digest with accumulated data chunks. Declared In SHAMessageDigest.h – size size of the message digest in bytes. - (size_t)size Return Value size of the message digest in bytes. Declared In SHAMessageDigest.h