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Questions tagged [ecdsa]

In cryptography, the Elliptic Curve Digital Signature Algorithm offers a variant of the Digital Signature Algorithm which uses elliptic curve cryptography.

Elliptic Curve Digital Signature is a variant of algorithms. It allows in some cases a smaller public key (for instance, 160 bit in ecdsa compared to 1024 bit in dsa for 80 but security level), and requires the two sides to agree on a curve's field and equation, as well as a prime order on the curve and a multiplicative of the order.

Wikipedia description of Elliptic Curve Digital Signature

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PFXExportCertStoreEx to export private and public keys

I have used PFXExportCertStoreEx API to successfully export public and private key of a RSA certificate from Windows key store. Can the same PFXExportCertStoreEx be used to export public and private keys of DSS and ECDSA certificates from the…
Amal Jesudas
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Uninitialized Key Exception when using getK() in Elliptic Curve DSA on javacard

When trying to use the getK() method on a key pair in JavaCard I get this exception code: CryptoException.UNINITIALIZED_KEY Here is my code where I generate the key pair: KeyPair key = new KeyPair(KeyPair.ALG_EC_FP,…
LozCodes
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Not able to export ECDSA certificate from Windows Store

PFXExportCertStoreEx fails when I try to export ECDSA certificate from Windows Store. I need to get both the public key and private key of the certificate. Is the API usage wrong for ECDSA certificate? I am able to export cert and key for a RSA…
Amal Jesudas
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Rough probability that a random point on secp256k1 could be a valid public key

We are working on some detailed estimates for the time required for a quantum computer to break ECC, and are using secp256k1 as an example. This question does not seem to be directly addressed in standard cryptography literature. What is the…
PKI Security Analyzer
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openssl rust crate: ECDSA signature size is not 64 bytes?

I want to use OpenSSL rust crate to perform cryptography operations, specifically using the ECDSA algorithm. I use the following code to generate an ECDSA key (elliptic curve P-256) and use that to sign data and get the signature: use…
Shiqi
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(ECDSA-BouncyCastle)Cryptographic Algorithm Validation Program(CAVP) Testing: Digital Signatures

We use ECDSA with secp256r1 in our project.Also we are using Bouncy Castle libraries. How can I CAVP using NIST test vectors? I am newbie.Probably the answer is simple. The link with the test vector is…
Naim OZBAG
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Certificate Verify, "error:068000C7:asn1 encoding routines::unknown signature algorithm"

I would like to create a certificate with ECC. I am using ecdsa_with_SHA3-512 as signature algorithm. I can succesfully sign the certificate as below. auto message_digest = EVP_MD_fetch(nullptr,"SHA3-512", nullptr); if (!message_digest) { …
selim
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Can anyone explain what are these parameters for this function?

int EC_POINT_set_compressed_coordinates_GFp (const EC_GROUP *group, EC_POINT *p, const BIGNUM *x, int y_bit, BN_CTX *ctx); I just want to set the randomly generated ECDH public key as the X9.62 compressed coordinate of a point over GFp for group…
CPPDev
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UWP, C#: ECDSA Key Generation and Onboaring

[I am new to security so, I apologize if I am asking something obvious] I am working on making an existing UWP Application to have encrypted local communication over Ethernet (TCP) with an local embedded device. Here's step 1: Step 1 Step 1 is to…
Teja
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ed25519 signature java curve not supported

I'm trying to make a ECDSA signature using the ed25519 curve in Java, using the Bouncy Castle library. I have managed to generate the keys and to be able to obtain the public key given the private key. However, I'm struggling to sign some data with…
anon38473938
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Is there a way for generation of ecdh shared key in 'node-forge' or other checked and secure js oackage

Well what i want to obtain is something like this import * as forge from 'node-forge' const aliceKey = forge.pki.ed25519.generateKeyPair(); const bobKey = forge.pki.ed25519.generateKeyPair(); //get shared secret for bob and alice function…
MaciejDot
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Why does creating ECDSA keypairs via python differ from ssh-keygen -t ecdsa and how can I avoid that?

For openstack apparently I need the key-output like ssh-keygen -t ecdsa generates it, but I am not getting similar output when using the ecdsa modul in python. def createECDSAKeyPairLocally(projectName="current"): sk =…
Natan
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Rust k256 can't create signer

I have the k256 crate and I'm trying to sign a string. Here is my code: let priv_key = SigningKey::from_bytes(self.private_key.as_bytes()).expect("Make priv key"); let tx_hash = transaction.get_hash(); let signer = Signer::new(&tx_hash); let sig =…
oriont
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Passing ECDSA v, r, and s values as function arguments to Solidity smart contract

There's a smart contract that I'm interacting with via ethers.js which has a function withdraw(uint8 v, bytes32 r, bytes32 s) that withdraws funds stored in the contract to the caller's account and where the v, r, and s arguments are ECDSA values…
icosceles
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ECDSA signature verify very SLOW on ESP32 with mbedtls

We’re using mbedtls on an Espressif ESP32 module (32-bit Xtensa core, 160 MHz) to verify the signature of commands sent over Bluetooth. We use ECDSA signatures and a key pair generated with the secp256r1 curve. The signed commands are sent by a…
Jeremy
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