crypto | API接口加密,使用swagger-bootstrap-ui开发接口文档 | Frontend Framework library
kandi X-RAY | crypto Summary
kandi X-RAY | crypto Summary
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Top functions reviewed by kandi - BETA
- Around method invocation
- Remove suffix
- Get parameter from method
- Sanity check for equality
- Compare two CharSequences
- Encrypt body
- Need encrypt
- Count the number of occurrences of the given string
- Count the number of occurrences of the given char
- Method to remove all characters in the given range
- Method to remove all characters
- Convert name to camel case
- Parse lower case
- Method to get all characters
- Wrap a join result
- Shortcut method
- Basic comparison function
- Write buffer to output stream
- Helper method to convert string to strings
- Wraps the given string if it is missing
- Clean white space
- Encrypt bytes
- Subkk string
- Cut a string
- Convert a string to an underscore style
- Decrypt bytes
crypto Key Features
crypto Examples and Code Snippets
Community Discussions
Trending Discussions on crypto
QUESTION
What is the equivalent Python expression for this Javascript expression?
...ANSWER
Answered 2021-Jun-15 at 10:03So I found the answer thanks to comments above.
Here is the Javascript version:
QUESTION
I'm currently trying out Android Compose. I have a Text that shows price of a crypto coin. If a price goes up the color of a text should be green, but if a price goes down it should be red. The function is called when a user clicks a button. The problem is that the function showPrice()
is called multiple times (sometimes just once, sometimes 2-4 times). And because of that the user can see the wrong color. What can I do to ensure that it's only called once?
MainActivity:
...ANSWER
Answered 2021-Jun-13 at 03:17What can I do to ensure that it's only called once?
Nothing, that's how it's meant to work. In the View system you would not ask "Why is my view invalidated 3 times?". The framework invalidates (recomposes) the view as it needs, you should not need to know or care when that happens.
The issue with your code is that your Composable is reading the old value from preferences, that is not how it should work, that value should be provided by the viewmodel as part of the state. Instead of providing just the new price, expose a Data Class that has both the new and old price and then use those 2 values in your composable to determine what color to show, or expose the price and the color to use.
QUESTION
I want to encrypt files fore secure storage, but the problem is, I don't know how to store the key to decrypt the files afterwards.
Code:
...ANSWER
Answered 2021-Jan-03 at 15:18The way you're encrypting data makes no sense. Asymmetric encryption can only encrypt a small, fixed amount of data. Never use asymmetric encryption such as RSA-OAEP for anything other than a symmetric key, and use that symmetric key to encrypt the actual data. For the symmetric encryption, use a proper AEAD mode such as AES-GCM or ChaCha20-Poly1305. This is called hybrid encryption.
Other things that are wrong with your code:
- A 1024-bit RSA key is not enough for security: 2048-bit is a minimum, and you should prepare to move away from RSA because its key sizes don't scale well. (Feel free to use 1024-bit keys for testing and learning, just don't use anything less than 2048-bit for RSA in production.)
- The encryption is a binary format, but you join up lines as if they were text. Text or binary: pick one. Preferably use a well-known format such as ASN.1 (complex but well-supported) for binary data or JSON for text. If you need to encode binary data in a text format, use Base64.
If this is for real-world use, scrap this and use NaCl or libsodium. In Python, use a Python wrapper such as libnacl, PyNaCl, pysodium or csodium. Use a public-key box. The Python APIs are slightly different for each Python wrapper, but all include a way to export the keys.
If this is a learning exercise, read up on hybrid encryption. Look inside libsodium to see how to do it correctly. Key import and export is done with the methods import_key
and export_key
. Symmetric encryption starts with Crypto.Cipher.AES.new(key, Crypto.Cipher.AES.MODE_GCM)
or Crypto.Cipher.ChaCha20_Poly1305.new(key)
(Crypto.Cipher.AES.new(key, Crypto.Cipher.AES.MODE_GCM, nonce=nonce)
or Crypto.Cipher.ChaCha20_Poly1305.new(key, nonce=nonce)
for decryption).
QUESTION
I am trying encrypting in JS front end and decrypt in python backend using AES GCM cryptographic algorithm. I am using Web cryptography api for JS front end and python cryptography library for python backend as cryptographic library. I have fixed the IV for now in both side. I have implemented encryption-decryption code in both side, they work on each side. But I think the padding is done differently, can't seem to figure out how the padding is done in web cryptography api. Here is the encryption and decryption for the python backend:
...ANSWER
Answered 2021-Jun-14 at 18:01GCM is a stream cipher mode and therefore does not require padding. During encryption, an authentication tag is implicitly generated, which is used for authentication during decryption. Also, an IV/nonce of 12 bytes is recommended for GCM.
The posted Python code unnecessarily pads and doesn't take the authentication tag into account, unlike the JavaScript code, which may be the main reason for the different ciphertexts. Whether this is the only reason and whether the JavaScript code implements GCM correctly, is difficult to say, since the getMessageEncoding()
method was not posted, so testing this was not possible.
Also, both codes apply a 16 bytes IV/nonce instead of the recommended 12 bytes IV/nonce.
Cryptography offers two possible implementations for GCM. One implementation uses the architecture of the non-authenticating modes like CBC. The posted Python code applies this design, but does not take authentication into account and therefore implements GCM incompletely. A correct example for this design can be found here.
Cryptography generally recommends the other approach for GCM (s. the Danger note), namely the AESGCM
class, which performs implicit authentication so that this cannot be accidentally forgotten or incorrectly implemented.
The following implementation uses the AESGCM
class (and also takes into account the optional additional authenticated data):
QUESTION
how can i send a file/image in reactjs uploaded through an to the backend, using axios? the simple input form is this :
...ANSWER
Answered 2021-Jun-14 at 13:28Since Postman worked, your backend is setup properly. Now on to your frontend.
Axios handles multipart form data if your data is an instance of FormData.
- In your component you can set a state variable to hold the selected file
QUESTION
Situation: I am working with a crypto library called embedded disco, I have a demo working on my PC but when porting it over to the MCU I get a hard fault when executing a library procedure. In the faulting code, the library is trying to simply copy the content of one strobe_s
struct into another strobe_s
. This is done twice: once for s1
and once for s2
. For s1
, the library simply assigns the dest. struct to the source struct. For s2
however, such an assign gave a hard fault. As the Cortex-M ISA requires aligned memory accesses, I reckoned that replacing the assignment with a memcpy should fix the problem. Nevertheless, simply stepping into memcpy using the debugger results in a hard fault! I.e. I have a breakpoint at the line with the memcpy and when stepping inside the fault handler is called! I have used memcpy to fix misaligned memory accesses in other parts of the code just fine...
MCU: STM32L552ZET6QU
Faulting code:
The code below is my modification of the original library code where the assignment to *s2
was replaced by a memcpy. The original code from the library's github was:
ANSWER
Answered 2021-Jun-14 at 10:32Here:
QUESTION
I've found a script for downloading information about crypto currencies so that I can download into a Numbers spreadsheet using AppleScript. This is the script:
...ANSWER
Answered 2021-Jun-13 at 05:22The short answer is that the main page contains an explicit html table, while the watchlist page seems to be a structured series of div elements generated by javascript and made to look like a table. There is no 'tbody' element on the watchlist page because there is no table there. The text items command splits the first page into three parts (the second of which is the one you want); it doesn't split the watchlist page at all, which produces an array with a single item containing all of the html. When you ask an array of 1 element for its second item, you get your error.
You're going to have to examine the html of the second page and figure out how to split the text to extract the information you want.
QUESTION
Im using Typescript, Electron, Webpack and NodeJS to make a webapp but for some reason the import/export isnt working properly.
The error im receiving is:
"Warning: React.createElement: type is invalid -- expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports."
Ive tripled checked my imports and exports and the component is still undefined when its called.
Console.Log Output of appView.tsx imported component:
File Structure:
...ANSWER
Answered 2021-Jun-14 at 04:23*Edited
My mistake was thinking that the webpack ts-loader would take context from from ts-config file and transpile the typescript according to that and webpack the content into the final bundle. Upon looking at my question again ive realised i put the index.tsx file as my entry point which is why i was still getting a bundled webpack file but my imports were undefined the only file being webpack was my index file i believe. That combined with the single file output tsc seems to have been the cause.
tsc
was creating a bundle of my typescript.
webpack
was creating a bundle of just my index.tsx file
Problem entry: './src/index.tsx'
& "outFile": "./dist/main.js"
QUESTION
I want implement a elliptic curve diffie hellman using HKDF as key derivation function. I am using a python backend and (vanilla) javascript in frontend. I am using python cryptography library in backend and Web Crypto api in frontend as cryptographic library. I created ECDH key pair in both side and exchanged the pbulic keys. Now I am trying to create the AES shared key with the exchanged public key and private key along with HKDF algorithm. I am able to do it in the python backend (I followed this example for the python code):
...ANSWER
Answered 2021-Jun-13 at 11:02The referenced Python code uses P-384 (aka secp384r1) as elliptic curve. This is compatible with the WebCrypto API, which supports three curves P-256 (aka secp256r1), P-384 and P-521 (aka secp521r1), see EcKeyImportParams
.
The following WebCrypto code generates a shared secret using ECDH and derives an AES key from the shared secret using HKDF. In detail the following happens:
- To allow comparison of the derived key with that of the referenced Python code, predefined EC keys are applied. The private key is imported as PKCS#8, the public key as X.509/SPKI. Note that due to a Firefox bug concerning the import of EC keys, the script below cannot be run in the Firefox browser.
- After the import the shared secret is created with ECDH using
deriveBits()
(and notderiveKey()
). - The shared secret is imported with
importKey()
and then the AES key is derived using HKDF, again withderiveBits()
.
QUESTION
Trying insert records into MySQL. This is my code
...ANSWER
Answered 2021-Jun-13 at 04:48This (pid, port_name, headshot, work_ex,)
is a tuple. What arguments does the cursor.execute(...)
function expect? Can you try removing the parentheses around those variables and have them each be arguments to cursor.execute
?
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install crypto
You can use crypto like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the crypto component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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