在Objective-c中,我们可以像这样对字符串进行哈希处理:
const char *cStr = [someString UTF8String]; unsigned char result[16]; CC_MD5( cStr, strlen(cStr), result ); md5String = [NSString stringWithFormat: @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", result[0], result[1], result[2], result[3], result[4], result[5], result[6], result[7], result[8], result[9], result[10], result[11], result[12], result[13], result[14], result[15] ];
但是CC_MD5在Swift中不起作用。我们该如何处理?
这就是我想出的。它是String的扩展。不要忘了添加#import <CommonCrypto/CommonCrypto.h>到Xcode创建的ObjC-Swift桥接头中。
#import <CommonCrypto/CommonCrypto.h>
extension String { var md5: String! { let str = self.cStringUsingEncoding(NSUTF8StringEncoding) let strLen = CC_LONG(self.lengthOfBytesUsingEncoding(NSUTF8StringEncoding)) let digestLen = Int(CC_MD5_DIGEST_LENGTH) let result = UnsafeMutablePointer<CUnsignedChar>.alloc(digestLen) CC_MD5(str!, strLen, result) let hash = NSMutableString() for i in 0..<digestLen { hash.appendFormat("%02x", result[i]) } result.dealloc(digestLen) return String(format: hash as String) } }