Implementation of SHA224/SHA256/SHA384/SHA512 encryption algorithm for iOS development--OBJECTIVE-C __ Algorithm

Previously implemented in the blog SHA1 Security has not met the needs of users, today the implementation of the sha224/sha256/sha384/sha512 attached. The SHA that Secure Hash algorithm (safe hashing algorithm) has many kinds of different bit number realization, common has sha224/sha256/sha384/sha512 and so on

SHA224:

-(nsstring*) sha224 { const char *cstr = [self cstringusingencoding:nsutf8stringencoding]; NSData *data = [NSData datawithbytes:cstr length:self.length]; uint8_t Digest[cc_sha224_digest_length]; cc_sha224 (Data.bytes, Data.length, Digest); nsmutablestring* output = [nsmutablestring stringwithcapacity:cc_sha224_digest_length * 2]; for (int i = 0; i < cc_sha224_digest_length i++) [Output appendformat:@ "%02x", Digest[i]]; return output; }

SHA256:

-(nsstring*) sha256 { const char *cstr = [self cstringusingencoding:nsutf8stringencoding]; NSData *data = [NSData datawithbytes:cstr length:self.length]; uint8_t Digest[cc_sha256_digest_length]; cc_sha256 (Data.bytes, Data.length, Digest); nsmutablestring* output = [nsmutablestring stringwithcapacity:cc_sha256_digest_length * 2]; for (int i = 0; i < cc_sha256_digest_length i++) [Output appendformat:@ "%02x", Digest[i]]; return output; }

SHA384:

-(nsstring*) sha384 { const char *cstr = [self cstringusingencoding:nsutf8stringencoding]; NSData *data = [NSData datawithbytes:cstr length:self.length]; uint8_t Digest[cc_sha384_digest_length]; cc_sha384 (Data.bytes, Data.length, Digest); nsmutablestring* output = [nsmutablestring stringwithcapacity:cc_sha384_digest_length * 2]; for (int i = 0; i < cc_sha384_digest_length i++) [Output appendformat:@ "%02x", Digest[i]]; return output; }

SHA512:

-(nsstring*) sha512 { const char *cstr = [self cstringusingencoding:nsutf8stringencoding]; NSData *data = [NSData datawithbytes:cstr length:self.length]; uint8_t Digest[cc_sha512_digest_length]; cc_sha512 (Data.bytes, Data.length, Digest); nsmutablestring* output = [nsmutablestring stringwithcapacity:cc_sha512_digest_length * 2]; for (int i = 0; i < cc_sha512_digest_length i++) [Output appendformat:@ "%02x", Digest[i]]; return output; }

Put together a great unity

NSSTRING+SHA.H//#import <Foundation/Foundation.h> #import <CommonCrypto/CommonDigest.h> #import <CommonCrypto/CommonCryptor.h> @interface NSString (SHA)-(NSString *) SHA1; -(NSString *) sha224; -(NSString *) sha256; -(NSString *) sha384; -(NSString *) sha512; @end////NSSTRING+SHA.M//#import "Nsstring+sha.h" @implementation nsstring (SHA)-(nsstring*) SHA1 {const-ch Ar *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*) sha224 {const char *cstr = [self cstringusingencoding:nsutf8stringencoding]; NSData *data = [NSData datawithbytes:cstr length:self.length]; uint8_t Digest[cc_sha