OpenSSL commands to create a Bitcoin private/public keys from a ECDSA keypair

generate-bitcoin-keys.sh

#!/bin/sh

PRIVATE_KEY="ECDSA"
PUBLIC_KEY="ECDSA.pub"
BITCOIN_PRIVATE_KEY="bitcoin"
BITCOIN_PUBLIC_KEY="bitcoin.pub"

echo "Generating private key"
openssl ecparam -genkey -name secp256k1 -rand /dev/random -out $PRIVATE_KEY

echo "Generating public key"
openssl ec -in $PRIVATE_KEY -pubout -out $PUBLIC_KEY

echo "Generating Bitcoin private key"
openssl ec -in $PRIVATE_KEY -outform DER|tail -c +8|head -c 32|xxd -p -c 32 > $BITCOIN_PRIVATE_KEY

echo "Generating Bitcoin public key"
openssl ec -in $PRIVATE_KEY -pubout -outform DER|tail -c 65|xxd -p -c 65 > $BITCOIN_PUBLIC_KEY

Random State Options
Prior to OpenSSL 1.1.1, it was common for applications to store information about the state of the random-number generator in a file that was loaded at startup and rewritten upon exit. On modern operating systems, this is generally no longer necessary as OpenSSL will seed itself from a trusted entropy source provided by the operating system. These flags are still supported for special platforms or circumstances that might require them.

Source: https://www.openssl.org/docs/man3.0/man1/openssl.html

Is there a reason to include the part of the command: -rand /dev/random?

@GregoryTrzonkowski unfortunately I don't really remember as the gist is 2 years old. But looking at the documentation you quoted, seems that it's not needed

1. BITCOIN_PRIVATE_KEY name may be misleading. There is the hex representation of ECDSA key in the script above. In contrast Bitcoin private keys are typically represented in WIF format (Base58Check encoding) like exported from Bitcoin Core and imported by many wallets.

There is the script that converts keys genereted by OpenSSL to Bitcoin Wallet Import Format (WIF): https://gist.github.com/GregTonoski/438992249df6e4bd613f9758421ff38a

how to hack bitcoin

Hi,I want to generate a password with bitcoin hash string.Is there any openssl script or command that I can use in the terminal for this.Thank you in advance for your help.

Ready to learn it ?

+1