hmac

I am trying to create a signature using the HMAC-SHA256 algorithm and this is my code. I am using US ASCII encoding. final Charset asciiCs = Charset.forName("US-ASCII"); final Mac sha256_HMAC = Mac.getInstance("HmacSHA256"); final SecretKeySpec secret_key = new javax.crypto.spec.SecretKeySpec(asciiCs.encode("key").array(), "HmacSHA256"); final byte[] mac_data = sha256_HMAC.doFinal(asciiCs.encode("The quick brown fox jumps over the lazy dog").array()); String result = ""; for (final byte element : mac_data) { result += Integer.toString((element & 0xff) + 0x100, 16).substring(1); } System.out

I am trying to make use of a REST API using C#. The API creator has provided sample libraries in PHP, Ruby and Java. I am getting hung up on one part of it where I need to generate an HMAC . Here's how it is done in the sample libraries they have provided. PHP hash_hmac('sha1', $signatureString, $secretKey, false); Ruby digest = OpenSSL::Digest::Digest.new('sha1') return OpenSSL::HMAC.hexdigest(digest, secretKey, signatureString) Java SecretKeySpec signingKey = new SecretKeySpec(secretKey.getBytes(), HMAC_SHA1_ALGORITHM); Mac mac = null; mac = Mac.getInstance(HMAC_SHA1_ALGORITHM); mac.init

hmac模块和hashlib模块 一、hash是什么 ​ 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 # 作用：密码加密，无论你丢进什么字符串，他都会返回一串固定长度的字符串 m = hashlib.md m = update m1 = hashlib.md5() # 固定写法 m1.update(b'123456') print("m1：", m1.hexdigest()) m2 = hashlib.md5() m2.update(b'123') m2.update(b'456') print("m2: ", m2.hexdigest()) 结果（结果都是一样的）：

目录 一、hashlib模块 1.0.1 hashlib是什么 1.0.2 撞库破解hash算法加密 二、hmac模块 目录 一、hashlib模块 密码加密：无论你丢什么字符串，他都会返回一串 固定长度的字符串 变成固定的字符串 相同的字符串哈希后结果一样 叠加性 1.0.1 hashlib是什么 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。 hashlib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 import hashlib m = hashlib.md5() m.update('hello'.encode('utf8')) print(m.hexdigest()) # 5d41402abc4b2a76b9719d911017c592 import

I'm trying to find a list of strings that can be used a a crypto algorithm to fit into this function, replacing SHA256 . crypto.createHmac("SHA256", secret).update(string).digest('base64'), I've come to the understanding that crypto uses openssl , and that the algorithms are specific to each system running node.js. With the following commands you can see a list of all algorithms available for your system. openssl list-cipher-algorithms openssl list-cipher-commands I've outputted the content of those two commands to this gist . What bothers me is that SHA256 is not in either of those lists. I

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 "<stdin>", line 1, in <module> 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: key: expected bytes or bytearray,

There are test vectors for PBKDF2-HMAC-SHA1 in RFC6070 . There are test vectors for HMAC-SHA2 in RFC4231 . But so far I haven't found test vectors for PBKDF2-HMAC-SHA2 anywhere. I'm most interested in SHA256, so I'll post some vectors I calculated with my implementation. I'd be happy if someone could verify/confirm them, or contribute their own. aaz I implemented PBKDF2 using the standard hashlib and hmac modules in Python and checked the output against both the RFC 6070 vectors and the vectors you posted – it matches. Here are the vectors I get with a larger dkLen to match the larger digest

Is there any way to create a HmacSHA256 signature of a string in php? Use hash_hmac : $sig = hash_hmac('sha256', $string, $secret) Where $secret is your key. Pascal MARTIN The hash_hmac() function could help, here : Generate a keyed hash value using the HMAC method For example, the following portion of code : $hash = hash_hmac('sha256', 'hello, world!', 'mykey'); var_dump($hash); Gives the following output : string '07a932dd17adc59b49561f33980ec5254688a41f133b8a26e76c611073ade89b' (length=64) And, to get the list of hashing algorithms that can be used, see hash_algos() . Here is an example of

We are building a RESTful API using WCF (currently .Net 3.5, but will be moving to .Net 4 soon). We have a functional framework in place, but it is currently unsecured. It will need to be accessible from .Net applications as well as iOS, Android, and web applications. We would like to use an HMAC Authentication scheme as described here and here , but both examples seem to fall apart when describing how to validate the hash. The first example fails to describe the UserKeys object (hashtable?) and the second example is missing the GetUserKey methods on the client- and server-side. Can anyone