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Is there a standard, or at least well-accepted, CLI tool that calculates the public key out of a private key?

I've done my homework erading How do you get a Bitcoin Public Key from a Private Key, but it's from May 2014, and hopefully tooling has improved since then.

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To the best of my knowledge there is no standard CLI utility. However, there are some tools which seem to be generally accepted, like bitcoin-bash-tools

Alternatively, you can use some script library, such as pycoin (written in Python), or bitcoinjs.

Personally I like Bitcore libraries (Bitcore is not Bitcoin Core, despite their names are similar). They are also written in Javascript. I wrote a simple library for handling keys/addresses that can be used from the command line with the NodeJS interpreter: https://github.com/frz-dev/btcutils/blob/master/bitcore-keys-utils.js. In your case you can use the getPubKey function, passing the private key object.

Hope this helps

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In fact, there are few CLI utilies that allow you this:

  • sx : command line Bitcoin to empower the sysadmin

    cat key| sx pubkey

  • pybitcointools : SImple, common-sense Bitcoin-themed Python ECC library

    pybtctool privtopub key

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Try this: pip3 install btc-address-dump

Here is an example:

$ btc_address_dump c7ac679b56f50bfd54dd924fe45a8dca7a1c2dced254b03dac22afc03adb9127
private key (hex) = c7ac679b56f50bfd54dd924fe45a8dca7a1c2dced254b03dac22afc03adb9127
private key (WIF) = 5KLDyKtrScLYsKMJzVCt8Mf6Nn9DEV7V3fg8njfSZnqe7ZEMqzK
private key (WIF compressed) = L3urFcPsE2yHf5zeQjVSfUB8j8FEzX5cnmhjNsJfqjKgowPP4tmg
public key (uncompressed) = 044cd0aaeca3b636078583408e75edd77307b5190ca7a48bb9fbc1f2576c17dff1087190d91e26af594e3f8ecd3f4d3596c03c45d3b235da916903c930c6593cc4
public key (compressed) = 024cd0aaeca3b636078583408e75edd77307b5190ca7a48bb9fbc1f2576c17dff1
legacy address (p2pkh uncompressed) = 1Q5RqZctfcNkTPad2tuJSREByd2gB8xs63
legacy address (p2pkh compressed) = 12W36tm2jnreFiYdrzfE6cvRaKRbicEpnA
p2sh-segwit address (p2sh p2wpkh) = 3AzXxVUqdzvzEqVmdtmeVqRwc98uqwyh76
bech32 address (p2wpkh) = bc1qzp6lz6zy9p7k68r0a7lzfpkdxvj3yapynzuatt

This tool also support mnemonic words:

$ btc_address_dump "olympic wine chicken argue unaware bundle tunnel grid spider slot spell need"
mnemonic = olympic wine chicken argue unaware bundle tunnel grid spider slot spell need
private key (hex) = c7ac679b56f50bfd54dd924fe45a8dca7a1c2dced254b03dac22afc03adb9127
private key (WIF) = 5KLDyKtrScLYsKMJzVCt8Mf6Nn9DEV7V3fg8njfSZnqe7ZEMqzK
private key (WIF compressed) = L3urFcPsE2yHf5zeQjVSfUB8j8FEzX5cnmhjNsJfqjKgowPP4tmg
public key (uncompressed) = 044cd0aaeca3b636078583408e75edd77307b5190ca7a48bb9fbc1f2576c17dff1087190d91e26af594e3f8ecd3f4d3596c03c45d3b235da916903c930c6593cc4
public key (compressed) = 024cd0aaeca3b636078583408e75edd77307b5190ca7a48bb9fbc1f2576c17dff1
legacy address (p2pkh uncompressed) = 1Q5RqZctfcNkTPad2tuJSREByd2gB8xs63
legacy address (p2pkh compressed) = 12W36tm2jnreFiYdrzfE6cvRaKRbicEpnA
p2sh-segwit address (p2sh p2wpkh) = 3AzXxVUqdzvzEqVmdtmeVqRwc98uqwyh76
bech32 address (p2wpkh) = bc1qzp6lz6zy9p7k68r0a7lzfpkdxvj3yapynzuatt
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    Caution. This is a post by a new user, promoting new software. – Anonymous Jan 31 at 15:32

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