riscv-dv | Random instruction generator for RISC-V processor | Cryptography library

by chipsalliance Python Version: v0.8 License: Apache-2.0

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | riscv-dv Summary

riscv-dv is a Python library typically used in Security, Cryptography applications. riscv-dv has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has medium support. You can download it from GitHub.

RISCV-DV is a SV/UVM based open-source instruction generator for RISC-V processor verification. It currently supports the following features:.

Support

Quality

Security

License

Reuse

Support

riscv-dv has a medium active ecosystem.

It has 800 star(s) with 280 fork(s). There are 80 watchers for this library.

It had no major release in the last 6 months.

There are 80 open issues and 228 have been closed. On average issues are closed in 65 days. There are 10 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of riscv-dv is v0.8

Quality

riscv-dv has no bugs reported.

Security

riscv-dv has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

riscv-dv is licensed under the Apache-2.0 License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

riscv-dv releases are not available. You will need to build from source code and install.

Build file is available. You can build the component from source.

Installation instructions, examples and code snippets are available.

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riscv-dv Key Features

No Key Features are available at this moment for riscv-dv.

riscv-dv Examples and Code Snippets

No Code Snippets are available at this moment for riscv-dv.

Community Discussions

Trending Discussions on Cryptography

ECSDA sign with Python, verify with JS

How to calculate sha 512 hash properly in .NET 6

Crypto-js encryption and Python decryption using HKDF key

Exception "System.Security.Cryptography.CryptographicException" after Publishing project

Chaum blind signature with blinding in JavaScript and verifying in Java

KJUR jws jsrsasign: Cannot validate ES256 token on JWT.io

Is it possible to get ISO9796-2 signature with Trailer = 'BC' in Javacard?

How to transfer custom SPL token by '@solana/web3.js' and '@solana/sol-wallet-adapter'

From base64-encoded public key in DER format to COSE key, in Python

Why are signatures created with ecdsa Python library not valid with coincurve?

QUESTION

ECSDA sign with Python, verify with JS

Asked 2022-Apr-10 at 18:16

I'm trying to achieve the exact opposite of this here where I need to sign a payload in Python using ECDSA and be able to verify the signature in JS.

Here is my attempt, but I'm pretty sure I'm missing something with data transformation on either or both ends.

(Key types are the same as in the answer provided to the question above)

I've tried some other variations but nothing worked so far.

(The verification on JS returns False)

Python:

...

ANSWER

Answered 2022-Apr-10 at 18:16

The main problem is that both codes use different signature formats:
sign_payload() in the Python code generates an ECDSA signature in ASN.1/DER format. The WebCrypto API on the other hand can only handle the IEEE P1363 format.
Since the Python Cryptography library is much more convenient than the low level WebCrypto API it makes sense to do the conversion in Python code.

The following Python code is based on your code, but additionally performs the transformation into the IEEE P1363 format at the end:

Source https://stackoverflow.com/questions/71818496

QUESTION

How to calculate sha 512 hash properly in .NET 6

Asked 2022-Mar-30 at 04:56

In .NET 6 code from How can I SHA512 a string in C#?

...

ANSWER

Answered 2021-Nov-27 at 16:16

In my case I was using RNGCryptoServiceProvider in .NET 5 but when I updated to .NET 6 I got the same warning. After reading about it in this issue I changed my code from this:

Source https://stackoverflow.com/questions/70109573

QUESTION

Crypto-js encryption and Python decryption using HKDF key

Asked 2022-Mar-28 at 11:29

Based on the example provided here on how to establish a shared secret and derived key between JS (Crypto-JS) and Python, I can end up with the same shared secret and derived key on both ends.

However, when I try to encrypt as below, I cannot find a way to properly decrypt from Python. My understanding is that probably I am messing with the padding or salts and hashes.

...

ANSWER

Answered 2022-Mar-28 at 11:29

The issue is that the key is not passed correctly in the CryptoJS code.

The posted Python code generates LefjQ2pEXmiy/nNZvEJ43i8hJuaAnzbA1Cbn1hOuAgA= as Base64-encoded key. This must be imported in the CryptoJS code using the Base64 encoder:

Source https://stackoverflow.com/questions/71632056

QUESTION

Exception "System.Security.Cryptography.CryptographicException" after Publishing project

Asked 2022-Mar-19 at 05:01

Everytime I publish my Blazor Server-project to my website domain, and opening the website, this exception occurs, and there's little to no help Googling it:

And it says AppState.cs: line 21, so here's the codeline for it:

This exception is not happening under debugging localhost. When I delete localStorage from the browser on my website, and refreshing, then everything works. But I don't want my customers having this exception and having to tell them to delete the localstorage everytime I'm publishing.

My Program.cs if necessary:

...

ANSWER

Answered 2022-Mar-16 at 13:16

Try to set Load User Profile to true in your IIS app pool in the advanced settings. see this answer, I hope that will help you!

Source https://stackoverflow.com/questions/71494715

QUESTION

Chaum blind signature with blinding in JavaScript and verifying in Java

Asked 2022-Mar-04 at 16:01

I'm experimenting with Chaum's blind signature, and what I'm trying to do is have the blinding and un-blinding done in JavaScript, and signing and verifying in Java (with bouncy castle). For the Java side, my source is this, and for JavaScript, I found blind-signatures. I've created two small codes to play with, for the Java side:

...

ANSWER

Answered 2021-Dec-13 at 14:56

The blind-signature library used in the NodeJS code for blind signing implements the process described here:

BlindSignature.blind() generates the SHA256 hash of the message and determines the blind message m' = m * r^e mod N.
BlindSignature.sign() calculates the blind signature s' = (m')^d mod N.
BlindSignature.unblind() determines the unblind signature s = s' * r^-1 mod N.
BlindSignature.verify() decrypts the unblind signature (s^e) and compares the result with the hashed message. If both are the same, the verification is successful.

No padding takes place in this process.

In the Java code, the implementation of signing the blind message in signConcealedMessage() is functionally identical to BlindSignature.sign().
In contrast, the verification in the Java code is incompatible with the above process because the Java code uses PSS as padding during verification.
A compatible Java code would be for instance:

Source https://stackoverflow.com/questions/70324926

QUESTION

KJUR jws jsrsasign: Cannot validate ES256 token on JWT.io

Asked 2022-Mar-03 at 06:41

We are trying to make a JWT token for Apple Search Ads using the KJUR jws library. We are using the API documents from Apple:

https://developer.apple.com/documentation/apple_search_ads/implementing_oauth_for_the_apple_search_ads_api

We are generating a private key (prime256v1 curve):

openssl ecparam -genkey -name prime256v1 -noout -out private-key.pem

Next we are generating a public key from the private key:

openssl ec -in private-key.pem -pubout -out public-key.pem

Next we setup the header and payload:

...

ANSWER

Answered 2022-Mar-02 at 07:47

The issue is caused by an incorrect import of the key.

The posted key is a PEM encoded private key in SEC1 format. In getKey() the key is passed in JWK format, specifying the raw private key d. The PEM encoded SEC1 key is used as the value for d. This is incorrect because the raw private key is not identical to the SEC1 key, but is merely contained within it.

To fix the problem, the key must be imported correctly. jsrsasign also supports the import of a PEM encoded key in SEC1 format, but then it also needs the EC parameters, s. e.g. here. For prime256v1 aka secp256r1 this is:

Source https://stackoverflow.com/questions/71307444

QUESTION

Is it possible to get ISO9796-2 signature with Trailer = 'BC' in Javacard?

Asked 2022-Feb-24 at 10:46

I trying to get the RSA signature as described in Annex A2.1 of EMV book 2. As I understand it was described in ISO9796-2 as scheme 1, option 1. So, the resulting signature should contain a Header equal to '6A' and a Trailer equal to 'BC'.

The algorithms ALG_RSA_SHA_ISO9796 and ALG_RSA_SHA_ISO9796_MR are the only suitable that I could find. But they acting like scheme 1, option 2 with a Trailer equal to '33cc'

Is it possible to get a signature with Trailer = 'BC'?

Javacard example code:

...

ANSWER

Answered 2022-Feb-24 at 10:46

You can generate such signature using Cipher.ALG_RSA_NOPAD in decrypt mode.

Pseudocode:

Source https://stackoverflow.com/questions/71243483

QUESTION

How to transfer custom SPL token by '@solana/web3.js' and '@solana/sol-wallet-adapter'

Asked 2022-Jan-29 at 21:02

Hello I am trying to transfer a custom SPL token with the solana-wallet adapter. However i am having trouble getting the wallet's secret key/signing the transaction.

I've looked at these answers for writing the transfer code but i need to get the Singer and i have trouble figuring out how with solana-wallet adapter. These examples hardcode the secret key and since i'm using a wallet extension this is not possible.

How can you transfer SOL using the web3.js sdk for Solana?

How to transfer custom token by '@solana/web3.js'

according to this issue on the webadapter repo https://github.com/solana-labs/wallet-adapter/issues/120 you need to:

Create a @solana/web3.js Transaction object and add instructions to it
Sign the transaction with the wallet
Send the transaction over a Connection

But i am having difficulty finding examples or documentation as to how to do step 1 and 2.

...

ANSWER

Answered 2021-Dec-06 at 13:51

So i found a way to do this, it requires some cleanup and error handling but allows for a custom token transaction via @solana/wallet-adapter.

Source https://stackoverflow.com/questions/70224185

QUESTION

From base64-encoded public key in DER format to COSE key, in Python

Asked 2022-Jan-01 at 10:34

I have a base64-encoded public key in DER format. In Python, how can I convert it into a COSE key?

Here is my failed attempt:

...

ANSWER

Answered 2022-Jan-01 at 07:49

The posted key is an EC key for curve P-256 in X.509 format.

With an ASN.1 parser (e.g. https://lapo.it/asn1js/) the x and y coordinates can be determined:

Source https://stackoverflow.com/questions/70542577

QUESTION

Why are signatures created with ecdsa Python library not valid with coincurve?

Asked 2021-Dec-25 at 14:41

I'm switching from the pure Python ecdsa library to the much faster coincurve library for signing data. I would also like to switch to coincurve for verifying the signatures (including the old signatures created by the ecdsa library).

It appears that signatures created with ecdsa are not (always?) valid in coincurve. Could someone please explain why this is not working? Also, it seems that cryptography library is able to validate both ecdsa signatures and coincurve signatures without issues, consistently.

What is even more confusing, if you run below script a few times, is that sometimes it prints point 3 and other times it does not. Why would coincurve only occasionally find the signature valid?

...

ANSWER

Answered 2021-Dec-25 at 14:41

Bitcoin and the coincurve library use canonical signatures while this is not true for the ecdsa library.

What does canonical signature mean?
In general, if (r,s) is a valid signature, then (r,s') := (r,-s mod n) is also a valid signature (n is the order of the base point).
A canonical signature uses the value s' = -s mod n = n - s instead of s, i.e. the signature (r, n-s), if s > n/2, s. e.g. here.

All signatures from the ecdsa library that were not been successfully validated by the coincurve library in your test program have an s > n/2 and thus are not canonical, whereas those that were successfully validated are canonical.

So the fix is simply to canonize the signature of the ecdsa library, e.g.:

Source https://stackoverflow.com/questions/70477905

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install riscv-dv

There are two ways that you can run scripts from riscv-dv.

Support

RISC-V DV is now contributed to CHIPS Alliance. We have regular meetings to discuss the issues, feature priorities, development progress etc. Please join the mail group for latest status. Please refer to CONTRIBUTING.md for license related questions.

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