sha256

Possible to convert MD5 to SHA256?

由 落花浮王杯 提交于 2019-12-05 03:34:18
问题 I have a vBulletin Database with double MD5'd passwords and a salt, would it be possible to take the Password in the vBulletin database, convert them to SHA256, and then store them in a new database? Is there any real easy way to do this? My main and only reason, is to prevent users from having to create new accounts, and to stop using MD5. 回答1: Hashing algorithms are one-way i.e. They cannot be reversed unlike Encryption-Decryption algorithms. MD5() is a hashing algorithm , so is SHA-1 / SHA

Will a SHA256 hash always have 64 characters?

由 痞子三分冷 提交于 2019-12-04 22:17:11
I'm setting up my database to receive hashed passwords and not accept plain text. Would I go something like this? create table User( username varchar(20) not null, password varchar(64) not null, ); Yes, a SHA256 is always 256 bits long, equivalent to 32 bytes, or 64 bytes in an hexadecimal string format. You can even use char(64) instead of varchar(64) since the size won't change. vimist Yes, it will always have 64 characters. 来源： https://stackoverflow.com/questions/3064133/will-a-sha256-hash-always-have-64-characters

Java HmacSHA256 with key

由 半腔热情 提交于 2019-12-04 21:38:31
i have tried several links from stackoverflow to get HmacSHA256 with key to work with java, but i always get func check(body: String) -> String { let hash = body.hmac(HMACAlgorithm.sha256, key: Router.sigKey) print("SIG: " + Router.sigKey) print("result of hash. \(hash)") return hash } This function returns hash with key from given String. Key was: 0393e944ee8108bb66fc9fa4f99f9c862481e9e0519e18232ba61b0767eee8c6 String was: example Result is: 27effb76c97022497e25d3a5d7e823462f212a82d9ebba35f179071568b0c335 When i use this website to check if my SHA256 is good with the same key, it returns same

How to calculate sha256 faster in java?

由 我与影子孤独终老i 提交于 2019-12-04 21:09:35
问题 I have found out that calculating sha256 in java is slow. For example, it is slower than python. I wrote two simple benchmarks that calculate sha256 of 1GB of zeroes. In both cases the result is the same and correct, but the python time is 5653ms and the java time is 8623ms(53% slower). The result is similar every time and this is an important difference for me. How to make the calculation in java faster? Benchmarks: Java: import java.security.MessageDigest; import java.security

HMAC-SHA256 issue in Shopify oauth (Output does not match)

由 て烟熏妆下的殇ゞ 提交于 2019-12-04 18:30:48
I'm trying to publish an app on Shopify marketplace by following this documentation. And I'm stuck on step-3 of the oauth documentation wherein you have to do 'HMAC Signature Validation'. Documentation states that you have to process the string (specified below) through HMAC-SHA256 using app's shared secret key. String = "shop=some-shop.myshopify.com&timestamp=1337178173" I'm trying to implement the steps using Java. Following is gist of the code that I have used. private static final String HMAC_ALGORITHM = "HmacSHA256"; String key = "hush"; String data = "shop=some-shop.myshopify.com

Generate SHA256 hash in Objective-C

由 假装没事ソ 提交于 2019-12-04 18:03:54
问题 So I need to generate a Sha256 password in Objective-C, and can't figure out for the life of me how to do it! Is there something easy I'm just missing? I've tried implementing the following method (which was written for iPhone, but I figured maybe it'd work cross-platform, as some Objective-C code does) -(NSString*)sha256HashFor:(NSString*)input { const char* str = [input UTF8String]; unsigned char result[CC_SHA256_DIGEST_LENGTH]; CC_SHA256(str, strlen(str), result); NSMutableString *ret =

Android (Java) method equivalent to Python HMAC-SHA256 in Hex

由 ぃ、小莉子 提交于 2019-12-04 14:51:59
问题 I am attempting to replicate the Python HMAC-SHA256 equivalent in Android (Java). The Python representation is shown bellow with the correct output: Python print (hmac.new(key = binascii.unhexlify("0123465789"),msg = binascii.unhexlify("ABCDEF"),digestmod=hashlib.sha256).hexdigest()).upper() Output 5B5EE08A20DDD645A31384E51AC581A4551E9BE5AC8BF7E690A5527F2B9372CB However, I am unable to get the same output in Java using the code below: Java Mac sha256_HMAC = Mac.getInstance("HmacSHA256");

Why HMAC sha256 return different value on PHP & Javascript

由 谁说我不能喝 提交于 2019-12-04 14:02:55
问题 I am trying to build a HMAC SHA256 string in Javascript using CryptoJS, my existing code is written in PHP using the Akamai library. In some cases I am getting different results compared to PHP & I am unable to understand why it is giving me different results /* <php> Using native hash_hmac Generating key by concatenating char */ $signature1 = hash_hmac('SHA256', "st=1453362060~exp=1453363260~acl=/*", chr(63)); $signature2 = hash_hmac('SHA256', "st=1453362060~exp=1453363260~acl=/*", chr(63) .

Facebook Signed Request for iOS (HMAC SHA256)

由 半城伤御伤魂 提交于 2019-12-04 13:39:57
问题 I've been trying to generate HMAC SHA256 for Facebook signed request on iOS for weeks now. I am desperate need of help. Facebook signed requests have two parts which are separated by a period. First part is an HMAC256 of the payload while the 2nd part is Base64 encoded string of the payload. I've only been able to recreate the second part. vlXgu64BQGFSQrY0ZcJBZASMvYvTHu9GQ0YM9rjPSso . eyJhbGdvcml0aG0iOiJITUFDLVNIQTI1NiIsIjAiOiJwYXlsb2FkIn0 I've been using the following code that everybody

C# Calculate and verify SHA256 value for SEPA (XML) paymentfile

由 徘徊边缘 提交于 2019-12-04 12:51:39
i am struggling with the same issue like Markus Dreyer: C# Calculate SHA256 value for SEPA (XML) paymentfile According to the DFÜ Agreement i have to calculate a sha256 hash value: The hash value is created using the entire contained document, including the opening and closing tag. The document is canonicalized according to Canonical XML, version 1.0. ( http://www.w3.org/TR/2001/REC-xml-c14n-20010315 ). In the case of included documents, the canonisation has also to be executed accord-ing to the main document. SHA-256 is used as hash algorithm. This is a sample valid xml File ( exported from
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