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

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 sha_digest_length ibr>        [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 sha_digest_length ibr>        [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 sha_digest_length ibr>        [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 sha_digest_length ibr>        [Output appendformat:@ "%02x", Digest[i]];

    return output;
}

Put together a great unity

//
Nsstring+sha.h
//

#import
#import
#import

@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 char *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 sha_digest_length ibr> [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_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 sha_digest_length ibr> [Output appendformat:@ "%02x", Digest[i]];

return output;
}

-(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 sha_digest_length ibr> [Output appendformat:@ "%02x", Digest[i]];

return output;
}

-(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 sha_digest_length ibr> [Output appendformat:@ "%02x", Digest[i]];

return output;
}

-(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 sha_digest_length ibr> [Output appendformat:@ "%02x", Digest[i]];

return output;
}