Signing a message using ECDSA in OpenSSL - Stack Overflow

ECDSA Playground

ECDSA Playground
ECDSA Playground https://8gwifi.org/ecsignverify.jsp

Elliptic Curve Digital Signature Algorithm or ECDSA is a cryptographic algorithm used by Bitcoin to ensure that funds can only be spent by their rightful owners.
This tool is capable of generating key the the curve


https://preview.redd.it/9fwcnzijrgu11.png?width=1127&format=png&auto=webp&s=a4f36c49b74f3122b2bc903f7582c17ea041dec1
"c2pnb272w1", "c2tnb359v1", "prime256v1", "c2pnb304w1", "c2pnb368w1", "c2tnb431r1", "sect283r1", "sect283k1", "secp256r1", "sect571r1", "sect571k1", "sect409r1", "sect409k1", "secp521r1", "secp384r1", "P-521", "P-256", "P-384", "B-409", "B-283", "B-571", "K-409", "K-283", "K-571", "brainpoolp512r1", "brainpoolp384t1", "brainpoolp256r1", "brainpoolp512t1", "brainpoolp256t1", "brainpoolp320r1", "brainpoolp384r1", "brainpoolp320t1", "FRP256v1", "sm2p256v1" 
secp256k1 refers to the parameters of the elliptic curve used in Bitcoin’s public-key cryptography, and is defined in Standards for Efficient Cryptography (SEC)
A few concepts related to ECDSA:
  • private key: A secret number, known only to the person that generated it. A private key is essentially a randomly generated number. In Bitcoin, a private key is a single unsigned 256 bit integer (32 bytes).
  • public key: A number that corresponds to a private key, but does not need to be kept secret. A public key can be calculated from a private key, but not vice versa. A public key can be used to determine if a signature is genuine (in other words, produced with the proper key) without requiring the private key to be divulged.
  • signature: A number that proves that a signing operation took place.
Openssl Generating EC Keys and Parameters
$ openssl ecparam -list_curves secp256k1 : SECG curve over a 256 bit prime field secp384r1 : NIST/SECG curve over a 384 bit prime field secp521r1 : NIST/SECG curve over a 521 bit prime field prime256v1: X9.62/SECG curve over a 256 bit prime field 
An EC parameters file can then be generated for any of the built-in named curves as follows:
$ openssl ecparam -name secp256k1 -out secp256k1.pem $ cat secp256k1.pem -----BEGIN EC PARAMETERS----- BgUrgQQACg== -----END EC PARAMETERS----- 
To generate a private/public key pair from a pre-eixsting parameters file use the following:
$ openssl ecparam -in secp256k1.pem -genkey -noout -out secp256k1-key.pem $ cat secp256k1-key.pem -----BEGIN EC PRIVATE KEY----- MHQCAQEEIKRPdj7XMkxO8nehl7iYF9WAnr2Jdvo4OFqceqoBjc8/oAcGBSuBBAAK oUQDQgAE7qXaOiK9jgWezLxemv+lxQ/9/Q68pYCox/y1vD1fhvosggCxIkiNOZrD kHqms0N+huh92A/vfI5FyDZx0+cHww== -----END EC PRIVATE KEY----- 
Examine the specific details of the parameters associated with a particular named curve
$ openssl ecparam -in secp256k1.pem -text -param_enc explicit -noout Field Type: prime-field Prime: 00:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff: ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:fe:ff: ff:fc:2f A: 0 B: 7 (0x7) Generator (uncompressed): 04:79:be:66:7e:f9:dc:bb:ac:55:a0:62:95:ce:87: 0b:07:02:9b:fc:db:2d:ce:28:d9:59:f2:81:5b:16: f8:17:98:48:3a:da:77:26:a3:c4:65:5d:a4:fb:fc: 0e:11:08:a8:fd:17:b4:48:a6:85:54:19:9c:47:d0: 8f:fb:10:d4:b8 Order: 00:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff: ff:fe:ba:ae:dc:e6:af:48:a0:3b:bf:d2:5e:8c:d0: 36:41:41 Cofactor: 1 (0x1) 
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What is digital signature? - YouTube

ECDSA sample generating EC keypair, signing and verifying ECDSA signature TOP DOWNLOADS TUTORIALS API REFERENCE DEMOS (Step1) choose supported EC curve name and generate key pair ECC curve name: EC private key (hex): EC public key (hex): (Step2) Sign message Signature Algorithm: Message string to be signed: Signature value (hex): (Step3) Verify signature. NOTE: To use key pairs ... Ecdsa online. Bitcoin is a good example of a system that relies on ECDSA for security. tar. Apache, Nginx), SMTP server (e. uk Our site is a participant in ' To create an ECDSA signature, the data first needs to be hashed. As of OpenSSH 7. f. Public key cryptography is the science of designing cryptographic systems that employ pairs of keys: a public key (hence the name) that can be ... I created this because I couldn't find an offline tool or library able to create addresses from Bitcoin private keys, and as a learning exercise in Bitcoin address formats and ECDSA. Some day I'd like to replace the dependancy on OpenSSL with my own implementation of ECDSA (for portability). online elliptic curve key generation with curve name, openssl ecdsa generate key perform signature generation validation, ecdsa sign message, ecdsa verify message, ec generate curve sect283r1,sect283k1,secp256k1,secp256r1,sect571r1,sect571k1,sect409r1,sect409k1, ecdsa bitcoin tutorial I have all this working using ECDSA keypairs generated on the fly - i.e. my code is working nicely - but now I need to do the certificate piece. And I figured I could use OpenSSL's command-line to create the certificate which is installed on the client (along with the ECDSA private key in a separate file).

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What is digital signature? - YouTube

A digital signature is equivalent to a handwritten signature in paper, and a digital signature serves three basic purposes. Digital signature is commonly use...

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