目标C：SHA1

我如何sha1一个string或一组数字在目标c？

Answer 1

CommonCrypto（一个Apple框架）具有计算SHA-1散列的function，包括一步散列：

#include <CommonCrypto/CommonDigest.h> unsigned char digest[CC_SHA1_DIGEST_LENGTH]; NSData *stringBytes = [someString dataUsingEncoding: NSUTF8StringEncoding]; /* or some other encoding */ if (CC_SHA1([stringBytes bytes], [stringBytes length], digest)) { /* SHA-1 hash has been calculated and stored in 'digest'. */ ... } 

对于一组数字，让我们假设你的意思是已知长度的整数。 对于这样的数据，迭代构build摘要比使用单次函数更容易：

 unsigned char digest[CC_SHA1_DIGEST_LENGTH]; uint32_t *someIntegers = ...; size_t numIntegers = ...; CC_SHA1_CTX ctx; CC_SHA1_Init(&ctx); { for (size_t i = 0; i < numIntegers; i++) CC_SHA1_Update(&ctx, someIntegers + i, sizeof(uint32_t)); } CC_SHA1_Final(digest, &ctx); /* SHA-1 hash has been calculated and stored in 'digest'. */ ... 

请注意，这不考虑端到端。 在PowerPC系统上使用此代码计算的SHA-1将不同于在i386或ARM系统上计算的SHA-1。 解决方法很简单 – 在计算之前将整数的字节交换为已知的sorting：

  for (size_t i = 0; i < numIntegers; i++) { uint32_t swapped = CFSwapInt32HostToLittle(someIntegers[i]); /* or HostToBig */ CC_SHA1_Update(&ctx, &swapped, sizeof(swapped)); } 

Answer 2

消息摘要库（nv-ios-digest）的另一个解决scheme：

（1）string

 // Create an SHA1 instance, update it with a string and do final. SHA1 sha1 = [SHA1 sha1WithString:@"Hello"]; // Get the pointer of the internal buffer that holds the message digest value. // The life of the internal buffer ends when the SHA1 instance is discarded. // Copy the buffer as necessary. The size of the buffer can be obtained by // 'bufferSize' method. unsigned char *digestAsBytes = [sha1 buffer]; // Get the string expression of the message digest value. NSString *digestAsString = [sha1 description]; 

（2）数字

 // Create an SHA1 instance. SHA1 sha1 = [[SHA1 alloc] init]; // Update the SHA1 instance with numbers. // (Sorry, the current implementation is endianness-dependent.) [sha1 updateWithShort:(short)1]; [sha1 updateWithInt:(int)2]; [sha1 updateWithLong:(long)3]; [sha1 updateWithLongLong:(long long)4]; [sha1 updateWithFloat:(float)5]; [sha1 updateWithDouble:(double)6]; // Do final. 'final' method returns the pointer of the internal buffer // that holds the message digest value. 'buffer' method returns the same. // The life of the internal buffer ends when the SHA1 instance is discarded. // Copy the buffer as necessary. The size of the buffer can be obtained by // 'bufferSize' method. unsigned char *digestAsBytes = [sha1 final]; // Get the string expression of the message digest value. NSString *digestAsString = [sha1 description]; 

消息摘要库支持MD5，SHA-1，SHA-224，SHA-256，SHA-384和SHA-512。

[博客] iOS上的消息摘要（MD5，SHA1等）和专用类
http://darutk-oboegaki.blogspot.jp/2013/04/message-digests-md5-sha1-etc-on-ios.html

[图书馆] nv-ios-digest
https://github.com/TakahikoKawasaki/nv-ios-digest

Answer 3

Objective-C实际上并没有SHA1。 您可以使用公共领域授权的hashdeep和friends的C源代码（因为它是由美国政府雇员编写的）： http : //md5deep.sourceforge.net/ 。