hmac

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm working on a Java authentication subsystem that specs the storage of passwords in the DB as PBKDF2 -generated hashes, and I'm now trying to decide whether I should use SHA1 or SHA512 as PFR. I went through the specs of both but they are very mathematically intensive for me to follow. Can somebody with better crypto-understanding explain how PBKDF2WithHmacSHA512 differs from PBKDF2WithHmacSHA1 ? Here's what I'm trying to do: private static final int HASH_BYTE_SIZE = 64; // 512 bits private static final int PBKDF2_ITERATIONS = 1000; //

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm trying to set up a basic test of HMAC-SHA-256 hashing but I'm having problems with the engine setup. Ideally I would like to set up only the HMAC-SHA-algorithm but so far I haven't even gotten the general case where load all the algorithms to work. Currently I'm getting segfaults on the row where I try to set the default digests. Also, I'm regularly a Java guy, so don't hesitate to point out any mistakes in the code. #include #include #include #include #include int main() { unsigned char* key = (unsigned char*)

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a tomcat server running some Java code that lets users authenticate using an API key. The request uses an HMAC created with SHA256. I have a Ruby client that I am using to make the request and since I'm new to encryption I am having a difficult time getting it to generate a matching HMAC. I have tried not making it URL safe, and that matches. So I'm really wondering is how I can get the Ruby client to match with the URL safe version (since I can't change the Java code). It's just got an extra = character at the end. Thanks in advance

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I had a script in Python2 that was working great. def _generate_signature(data): return hmac.new('key', data, hashlib.sha256).hexdigest() Where data was the output of json.dumps . Now, if I try to run the same kind of code in Python 3, I get the following: Traceback (most recent call last): File " ", line 1, in File "/usr/lib/python3.4/hmac.py", line 144, in new return HMAC(key, msg, digestmod) File "/usr/lib/python3.4/hmac.py", line 42, in __init__ raise TypeError("key: expected bytes or bytearray, but got %r" %type(key).__name__) TypeError

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am trying to compile this library ndn-cxx in my laptop. I already tried in another computer and it compiled successfully but now i am getting this error and i think its related somhow to openssl. I verify that i have openssl in my laptop using sudo apt-cache search libssl | grep SSL and the result is : libssl-ocaml - OCaml bindings for OpenSSL (runtime) libssl-ocaml-dev - OCaml bindings for OpenSSL libssl0.9.8 - SSL shared libraries libsslcommon2 - enterprise messaging system - common SSL libraries libsslcommon2-dev - enterprise messaging

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I know this has been asked a few times but I have tried many of the accepted solutions already given. I am creating a simple SSH tunnel using JSch. and I keep getting this error along with this in the logs: INFO: diffie-hellman-group14-sha1 is not available. I have already added the Java unlimited policy files to the correct folder and I have added this algorithm to the KexAlgorithms section in the sshd_config file. Below is the full log breakdown. INFO: Connecting to xx.xx.xxx.xxx port 22 INFO: Connection established INFO: Remote version

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I recently came across the following code sample for encrypting a file with AES-256 CBC with a SHA-256 HMAC for authentication and validation: aes_key, hmac_key = self.keys # create a PKCS#7 pad to get us to `len(data) % 16 == 0` pad_length = 16 - len(data) % 16 data = data + (pad_length * chr(pad_length)) # get IV iv = os.urandom(16) # create cipher cipher = AES.new(aes_key, AES.MODE_CBC, iv) data = iv + cipher.encrypt(data) sig = hmac.new(hmac_key, data, hashlib.sha256).digest() # return the encrypted data (iv, followed by encrypted data,

HMAC-MD5算法 :K是密钥（OperatorSecret），长度可为64字节，若小于该长度，在密钥后面用“0”补齐。 2）HMAC-MD5流程 1) 在SigSecret）0来创建一个长为64字节的字符串(str)； 2) (str)与ipad(0x36)做异或运算，形成结果字符串(istr)； 3)将消息内容data附加到第二步的结果字符串(istr)的末尾； 4)做md5运算于第三步生成的数据流(istr)； 5) (str)与opad(0x5c)做异或运算，形成结果字符串(ostr)； 6)再将第四步的结果(istr)附加到第五步的结果字符串(ostr)的末尾； 7)做md5运算于第六步生成的数据流(ostr)，输出最终结果(out)。 HMAC-MD5检验工具 import java.io.UnsupportedEncodingException ; import java.security.MessageDigest ; import java.security.NoSuchAlgorithmException ; /** * @Title: HMacMD5Util * @Description: HMacMD5 * @author chy * @date 2018/6/11 15:32 */ public class HMacMD5Util { /** * md5

hashlib模块一般用于明文加密。 hash是一种算法（Python3.版本里使用hashlib模块代替了md5模块和sha模块，主要提供 SHA1、SHA224、SHA256、SHA384、SHA512、MD5 算法），该算法接受传入的内容，经过运算得到一串hash值。 hash值的特点： 只要传入的内容一样，得到的hash值一样，可用于非明文密码传输时密码校验 不能由hash值返解成内容，即可以保证非明文密码的安全性 只要使用的hash算法不变，无论校验的内容有多大，得到的hash值长度是固定的，可以用于对文本的哈希处理 hash算法其实可以看成如下图所示的一座工厂，工厂接收你送来的原材料，经过加工返回的产品就是hash值 import hashlib m = hashlib.md5() m.update('hello'.encode('utf8')) print(m.hexdigest()) 5d41402abc4b2a76b9719d911017c592 m.update('hash'.encode('utf8')) print(m.hexdigest()) 97fa850988687b8ceb12d773347f7712 m2 = hashlib.md5() m2.update('hellohash'.encode('utf8')) print(m2.hexdigest

So I'm trying to figure out how to do a hmacshad256 hash on ios as that's the hash I did for the wcf service api I made. I've been trying to look for some info about it but would usually just end up getting a SHA-256 hash. This is the only reference I have: Need to generate HMAC SHA256 hash in Objective C as in Java And I'm not sure if that's the only way to do it (importing a java hmac class) Any help is appreciated. Thanks! Juraj Antas NSString * parameters = @"string to hash" NSString *salt = @"saltStringHere"; NSData *saltData = [salt dataUsingEncoding:NSUTF8StringEncoding]; NSData