iOS開發之Objective-c的SHA224/SHA256/SHA384/SHA512加密算法的實現

之前在博文中實現的SHA1的安全性已經滿足不了用戶需求，今天把SHA224/SHA256/SHA384/SHA512的實現一併附上。
SHA即Secure Hash Algorithm（安全散列算法)有多種不同位數的實現，常見的有SHA224/SHA256/SHA384/SHA512等

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;
}

放到一起大團結

//
//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;
}