如何在ios中生成SHA256和CRC32

Question

我正在做一个文件上传工作.我想生成SHA256和CRC32哈希.任何人都可以帮助我如何生成这些哈希？我想让它适用于iOS.

Answer 1

SHA256在CommonCrypto中可用.CRC32不是散列,它是循环冗余校验.

示例代码:

#import <CommonCrypto/CommonDigest.h>

NSData *dataIn = [@"Now is the time for all good computers to come to the aid of their masters." dataUsingEncoding:NSASCIIStringEncoding];
NSMutableData *macOut = [NSMutableData dataWithLength:CC_SHA256_DIGEST_LENGTH];

CC_SHA256(dataIn.bytes, dataIn.length,  macOut.mutableBytes);

NSLog(@"dataIn: %@", dataIn);
NSLog(@"macOut: %@", macOut);

NSLog输出:
dataIn:<4e6f7720 69732074 68652074 696d6520 666f7220 616c6c20 676f6f64 20636f6d 70757465 72732074 6f20636f 6d652074 6f207468 65206169 64206f66 20746865 6972206d 61737465 72732e>

macOut:<53f89cf6 7ebfbe56 89f1f76a 3843dfd1 09d68c5b a938dcd2 9a12004e 108260cb>