iOS SHA算法

导入#import<CommonCrypto/CommonDigest.h>

//SHA

- (NSString* )SHA{

    const char *cstr = [self cStringUsingEncoding:NSUTF8StringEncoding];

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

    //使用对应的CC_SHA1,CC_SHA256,CC_SHA384,CC_SHA512的长度分别是20,32,48,64

    uint8_t digest[CC_SHA1_DIGEST_LENGTH];

    //使用对应的CC_SHA256,CC_SHA384,CC_SHA512

    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 ++){

       [outputappendFormat:@"%02x", digest[i]];

    }

    NSLog(@"%@",output);

    return output;

}