需要像在Java中一样在Objective C中生成HMAC SHA256哈希 [英] Need to generate HMAC SHA256 hash in Objective C as in Java
问题描述
我需要使用HMAC SHA256生成一个散列。我在Java中使用以下代码。我需要Objective-C中的等效代码。
javax.crypto.Mac mac = javax.crypto.Mac.getInstance（type ）;
javax.crypto.spec.SecretKeySpec secret = new javax.crypto.spec.SecretKeySpec（key.getBytes（），type）;
mac.init（secret）;
byte [] digest = mac.doFinal（value.getBytes（））;
StringBuilder sb = new StringBuilder（digest.length * 2）;
String s =;
（字节b：摘要）{
s = Integer.toHexString（b）;
if（s.length（）== 1）{
sb.append（'0'）;
}
sb.append（s）;
}
return sb.toString（）; b
$ Key $
值=
id = 456 |时间= 19:10 | nonce = 8
输出=
4effffffd8ffffffce7cffffffc4ffffffc71b2f72ffffffdc21ffffffa1ffffffe0ffffffe62d32550b0771296bffffff9c1159ffffffdeffffff8675ffffff9928654c
我有这个Objective-C函数：
//散列方法定义
- （NSString *）getHashEncription：（NSString *）key andData：（NSString *）data {
NSLog（@密钥％@和数据％@，密钥，数据）;
const char * cKey = [key cStringUsingEncoding：NSASCIIStringEncoding];
const char * cData = [data cStringUsingEncoding：NSASCIIStringEncoding];
unsigned char cHMAC [CC_SHA256_DIGEST_LENGTH];
// HmacSHA256
CCHmac（kCCHmacAlgSHA256，cKey，strlen（cKey），cData，strlen（cData），cHMAC）;
NSData * HMAC = [[NSData alloc] initWithBytes：cHMAC
length：sizeof（cHMAC）];
[Base64初始化];
NSString * b64EncStr = [Base64编码：HMAC];
NSLog（@Base 64 encoded =％@，b64EncStr）;
NSLog（@NSData Value％@，HMAC）;
// unsigned char hashedChars [32];
// NSString * inputString;
// inputString = [NSString stringWithFormat：@hello];
// NSData * inputData = [inputString dataUsingEncoding：NSUTF8StringEncoding];
// CC_SHA256（inputData.bytes，inputData.length，hashedChars）;
return [[NSString alloc] initWithData：HMAC encoding：NSASCIIStringEncoding];
} //结束getHashEncription
我得到的输出是这：
8736bc4aa7fc3aa071f2b4262b6972a89d2861559a20afa765e46ff17cb181a9
我尝试删除base64编码，但它不起作用。
任何建议都是值得欢迎的。
<解决方案您需要修复您的Java hmac打印机，因为 4effffffd8ffffffce7cffffffc4ffffffc71b2f72ffffffdc21ffffffa1ffffffe0ffffffe62d32550b0771296bffffff9c1159ffffffdeffffff8675ffffff9928654c 无效。所有这些 ffffff 中都有一个让步，即在将这些字节转换为十六进制之前，将这些字节签名扩展为32位有符号整数。推测正确的hmac是 4ed8ce7cc4c71b2f72dc21a1e0e62d32550b0771296b9c1159de86759928654c 。
无论如何，我怀疑你错误地调用了你的方法。我将你的代码复制到了一个测试程序中，该测试程序给出了你的密钥和数据的输出：
2011-12-10 13： 03：38.231 hmactest [8251：707] test hmac =< 4ed8ce7c c4c71b2f 72dc21a1 e0e62d32 550b0771 296b9c11 59de8675 9928654c>
符合您所需的输出（符号扩展错误除外）。
这里是我的测试程序：
#import< Foundation / Foundation.h>
#import< CommonCrypto / CommonHMAC.h>
NSData * hmacForKeyAndData（NSString * key，NSString * data）
{
const char * cKey = [key cStringUsingEncoding：NSASCIIStringEncoding];
const char * cData = [data cStringUsingEncoding：NSASCIIStringEncoding];
unsigned char cHMAC [CC_SHA256_DIGEST_LENGTH];
CCHmac（kCCHmacAlgSHA256，cKey，strlen（cKey），cData，strlen（cData），cHMAC）;
return [[NSData alloc] initWithBytes：cHMAC length：sizeof（cHMAC）];
}
int main（int argc，const char * argv []）
{
@autoreleasepool {
//与http：//比较en.wikipedia.org/wiki/HMAC#Examples_of_HMAC_.28MD5.2C_SHA1.2C_SHA256_.29
NSLog（@empty hmac =％@，hmacForKeyAndData（@，@））;
NSLog（@test hmac =％@，hmacForKeyAndData（@YARJSuwP5Oo6 / r47LczzWjUx / T8ioAJpUK2YfdI / ZshlTUP8q4ujEVjC0seEUAAtS6YEE1Veghz + IDbNQb + 2KQ ==，@id = 456 | time = 19：10 | nonce = 8 ））;
}
返回0;
}
I need to generate a hash using HMAC SHA256. I am using the following code in Java. I need an equivalent code in Objective-C.
javax.crypto.Mac mac = javax.crypto.Mac.getInstance(type);
javax.crypto.spec.SecretKeySpec secret = new javax.crypto.spec.SecretKeySpec(key.getBytes(), type);
mac.init(secret);
byte[] digest = mac.doFinal(value.getBytes());
StringBuilder sb = new StringBuilder(digest.length * 2);
String s="";
for (byte b: digest) {
s = Integer.toHexString(b);
if (s.length() == 1) {
sb.append('0');
}
sb.append(s);
}
return sb.toString();
Key = YARJSuwP5Oo6/r47LczzWjUx/T8ioAJpUK2YfdI/ZshlTUP8q4ujEVjC0seEUAAtS6YEE1Veghz+IDbNQb+2KQ==
Value =
id=456|time=19:10|nonce=8
Output =
4effffffd8ffffffce7cffffffc4ffffffc71b2f72ffffffdc21ffffffa1ffffffe0ffffffe62d32550b0771296bffffff9c1159ffffffdeffffff8675ffffff9928654c
I have this Objective-C function:
//Hash method Definition
- (NSString *)getHashEncription:(NSString *)key andData:(NSString *)data{
NSLog(@"Secret Key %@ And Data %@", key, data);
const char *cKey = [key cStringUsingEncoding:NSASCIIStringEncoding];
const char *cData = [data cStringUsingEncoding:NSASCIIStringEncoding];
unsigned char cHMAC[CC_SHA256_DIGEST_LENGTH];
//HmacSHA256
CCHmac(kCCHmacAlgSHA256, cKey, strlen(cKey), cData, strlen(cData), cHMAC);
NSData *HMAC = [[NSData alloc] initWithBytes:cHMAC
length:sizeof(cHMAC)];
[Base64 initialize];
NSString *b64EncStr = [Base64 encode:HMAC];
NSLog(@"Base 64 encoded = %@",b64EncStr);
NSLog(@"NSData Value %@", HMAC);
// unsigned char hashedChars[32];
// NSString *inputString;
// inputString = [NSString stringWithFormat:@"hello"];
// NSData * inputData = [inputString dataUsingEncoding:NSUTF8StringEncoding];
// CC_SHA256(inputData.bytes, inputData.length, hashedChars);
return [[NSString alloc] initWithData:HMAC encoding:NSASCIIStringEncoding];
}//End of getHashEncription
The output that I am getting is this:
8736bc4aa7fc3aa071f2b4262b6972a89d2861559a20afa765e46ff17cb181a9
I tried removing the base64 encoding, but it didn't work.
Any suggestions are most welcome.
解决方案 You need to fix your Java hmac printer, because 4effffffd8ffffffce7cffffffc4ffffffc71b2f72ffffffdc21ffffffa1ffffffe0ffffffe62d32550b0771296bffffff9c1159ffffffdeffffff8675ffffff9928654c isn't valid. All those ffffff in there are a giveaway that you are sign-extending the bytes to 32-bit signed integers before converting them to hex. Presumably the correct hmac is 4ed8ce7cc4c71b2f72dc21a1e0e62d32550b0771296b9c1159de86759928654c.
Anyway, I suspect you are calling your method incorrectly. I copied your code into a test program which gives me this output for your key and data:
2011-12-10 13:03:38.231 hmactest[8251:707] test hmac = <4ed8ce7c c4c71b2f 72dc21a1 e0e62d32 550b0771 296b9c11 59de8675 9928654c>
That matches your desired output (except for the sign-extension errors).
Here's my test program:
#import <Foundation/Foundation.h>
#import <CommonCrypto/CommonHMAC.h>
NSData *hmacForKeyAndData(NSString *key, NSString *data)
{
const char *cKey = [key cStringUsingEncoding:NSASCIIStringEncoding];
const char *cData = [data cStringUsingEncoding:NSASCIIStringEncoding];
unsigned char cHMAC[CC_SHA256_DIGEST_LENGTH];
CCHmac(kCCHmacAlgSHA256, cKey, strlen(cKey), cData, strlen(cData), cHMAC);
return [[NSData alloc] initWithBytes:cHMAC length:sizeof(cHMAC)];
}
int main (int argc, const char * argv[])
{
@autoreleasepool {
// Compare to http://en.wikipedia.org/wiki/HMAC#Examples_of_HMAC_.28MD5.2C_SHA1.2C_SHA256_.29
NSLog(@"empty hmac = %@", hmacForKeyAndData(@"", @""));
NSLog(@"test hmac = %@", hmacForKeyAndData(@"YARJSuwP5Oo6/r47LczzWjUx/T8ioAJpUK2YfdI/ZshlTUP8q4ujEVjC0seEUAAtS6YEE1Veghz+IDbNQb+2KQ==", @"id=456|time=19:10|nonce=8"));
}
return 0;
}
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