View Source BitcoinLib.Crypto.Secp256k1(BitcoinLib v0.4.2)

Elliptic curve cryptography

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Functions

Add two keys on the elliptic curve using Jacobian Point mathematics

Signs a message using a private key

Validates a signature

Link to this section Functions

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add_keys(key1, key2)

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Add two keys on the elliptic curve using Jacobian Point mathematics

examples Examples

``````iex> key1 = <<0x2E65A9C40338B8D07D72CD82BF3C9DDD0375F362863BC0808E6AD194F19F5EBA0::264>>
...> key2 = <<0x2702DED1CCA9816FA1A94787FFC6F3ACE62CD3B63164F76D227D0935A33EE48C3::264>>
...> BitcoinLib.Crypto.Secp256k1.add_keys(key1, key2)
<<0x2FC5BA55A539899D67EE66E99EE50AB59DCCBB122025D18C5EB9446D380A9EC0A::264>>``````
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sign(message, private_key)

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```@spec sign(binary(), %BitcoinLib.Key.PrivateKey{
chain_code: term(),
depth: term(),
fingerprint: term(),
index: term(),
key: term(),
parent_fingerprint: term()
}) :: bitstring()```

Signs a message using a private key

Below is an example of a signature... this doctest doesn't end with a value, because the signature is different on every call, and even can have different lengths.

examples Examples

``````iex> message = "76a914c825a1ecf2a6830c4401620c3a16f1995057c2ab88ac"
...> private_key = %BitcoinLib.Key.PrivateKey{key: <<0xd6ead233e06c068585976b5c8373861d77e7f030ec452e65ee81c85fa6906970::256>>}
...> BitcoinLib.Crypto.Secp256k1.sign(message, private_key)``````
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validate(signature, message, public_key)

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```@spec validate(
bitstring(),
bitstring(),
%BitcoinLib.Key.PublicKey{
chain_code: term(),
depth: term(),
fingerprint: term(),
index: term(),
key: term(),
parent_fingerprint: term(),
uncompressed_key: term()
}
| bitstring()
) :: boolean()```

Validates a signature

examples Examples

``````iex> signature = <<0x3044022048b3b0eb98ae5f2c997e41a2630a5e3512f24a1f5b6165e2867847a11b2b22350220032211844eec911dab6d91836a45c37ca1d498433d87b6b09e2f401025131a05::560>>
...> message = "76a914c825a1ecf2a6830c4401620c3a16f1995057c2ab88ac"
...> public_key = <<0x02702ded1cca9816fa1a94787ffc6f3ace62cd3b63164f76d227d0935a33ee48c3::264>>
...> BitcoinLib.Crypto.Secp256k1.validate(signature, message, public_key)
true``````