sha1 | 易学教程

SHA1 C# equivalent of this Java

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问题 Looking for the same equivalent to this method in C# try { MessageDigest md = MessageDigest.getInstance("SHA-1"); md.update(password.getBytes()); BigInteger hash = new BigInteger(1, md.digest()); hashword = hash.toString(16); } catch (NoSuchAlgorithmException ex) { } } return hashword; 回答1: Super easy in C#: using System; using System.Text; using System.Security.Cryptography; namespace CSharpSandbox { class Program { public static string HashPassword(string input) { var sha1 = SHA1Managed

Compute SHA-1 of byte array

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问题 I'm looking for a way of getting an SHA-1 checksum with a Java byte array as the message. Should I use a third party tool or is there something built in to the JVM that can help? 回答1: What about: import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.Formatter; public static String SHAsum(byte[] convertme) throws NoSuchAlgorithmException{ MessageDigest md = MessageDigest.getInstance("SHA-1"); return byteArray2Hex(md.digest(convertme)); } private

How to calculate the sha1 hash of a blob using node.js crypto

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问题 In my node.js app I would like to upload a file and calculate the sha1 . I tried the following : export function calculateHash(file, type){ const reader = new FileReader(); var hash = crypto.createHash('sha1'); hash.setEncoding('hex'); const testfile = reader.readAsDataURL(file); hash.write(testfile); hash.end(); var sha1sum = hash.read(); console.log(sha1sum); // fd.on((end) => { // hash.end(); // const test = hash.read(); // }); } The file is blob from selecting a file with a file upload

Which Root CA still issues SHA-1 ssl certificates?

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问题 Is there any CA that still issues SHA-1 certificates? I need it for TR management to manage devices with base firmware that does not support sha256. 回答1: imho, Public CA's will no longer issues SHA-1 certificates; they are bounded by the strict guidance of the Certificate Authority/Browser Forum to no longer issue new server certificates with SHA1 signature algorithm. 7.1.3. Algorithm Object Identifiers Effective 1 January 2016, CAs MUST NOT issue any new Subscriber certificates or

Is there any difference between md5 and sha1 in this situation?

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问题 It is known that 1. if ( md5(a) == md5(b) ) 2. then ( md5(a.z) == md5(b.z) ) 3. but ( md5(z.a) != md5(z.b) ) where the dots concatenate the strings. EDIT --- Here you can find a and b : http://www.mscs.dal.ca/~selinger/md5collision/ Check these links: hexpaste.com/qzNCBRYb/1 - this is a.md5(a)."kutykurutty" hexpaste.com/mSXMl13A/1 - this is b.md5(b)."kutykurutty" They share the same md5 hash, yet they are different. But you can call these strings a' and b' , because they have the same md5. --

What should I use for password fields in a table; MD5 or SHA1?

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问题 I am by no means a security expert or even a novice. I'm a newbie at security at best. Someone suggested I use SHA1 instead of MD5 - why would I choose one over the other? Is one more secure? 回答1: I would use SHA2(256) at the minimum - however: There is little or no point in simply hashing a password in a database due to rainbow table attacks. Equally, salted hashing is better, but if someone has access to your database, then the chances are that they have access to your code in which case

Why does encrypting HMAC-SHA1 in exactly the same code in C# and PowerShell show different results?

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问题 I've been trying to encrypt a Amazon S3-like authorization key with HMAC-SHA1 in PowerShell with the following code: $str="PUT\n\napplication/x-zip-compressed\nThu, 09 Feb 2017 08:59:43 GMT\n/test-bucket/test-key" $secret="c334da95a6734ff4a04abd99efca450f" $sha = [System.Security.Cryptography.KeyedHashAlgorithm]::Create("HMACSHA1") $sha.Key = [System.Text.Encoding]::UTF8.Getbytes($secret) $sign = [Convert]::Tobase64String($sha.ComputeHash([System.Text.Encoding]::UTF8.Getbytes(${str}))) echo

bugku | 各种绕过

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<?php highlight_file('flag.php'); $_GET['id'] = urldecode($_GET['id']); $flag = 'flag{xxxxxxxxxxxxxxxxxx}'; if (isset($_GET['uname']) and isset($_POST['passwd'])) { if ($_GET['uname'] == $_POST['passwd']) print 'passwd can not be uname.'; else if (sha1($_GET['uname']) === sha1($_POST['passwd'])&($_GET['id']=='margin')) die('Flag: '.$flag); else print 'sorry!'; } ?> 一个走心的payload： GET: id=%6d%61%72%67%69%6e&uname[]=1POST: passwd[]=2 一个草率的解析：一开始是想到：sha1()之后的值，是‘0e’开头的会变成科学记数法，然后结果都是为0，但是没想到后面还有一个‘&’ 利用数组的话，会报 “ Warning: sha1() expects parameter 1 to be string, array given in /usercode/file.php

How do I verify a DKIM signature in PHP?

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问题 I'll admit I'm not very adept at key verification. What I have is a script that downloads messages from a POP3 server, and I'm attempting to verify the DKIM signatures in PHP. I've already figured out the body hash (bh) validation check, but I can't figure out the header validation. http://www.dkim.org/specs/rfc4871-dkimbase.html#rfc.section.6.1.3 Below is an example of my message headers. I've been able to use the Mail::DKIM package to validate the signature in Perl, so I know it's good. I

Produce MD5 or SHA1 hash code to long (64 bits)

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问题 I need to compute a hash code of a string and store it into a 'long' variable. MD5 and SHA1 produce hash codes which are longer than 64 bits (MD5 - 128 bits, SHA1 - 160 bit). Ideas any one? Cheers, Doron 回答1: You can truncate the hash and use just the first 64 bits. The hash will be somewhat less strong, but the first 64 bits are still extremely likely to be unique. For most uses of a hash this is both a common and perfectly acceptable practice. You can also store the complete hash in two 64