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Version: v7.1.0

ecdsa_verify/4

Description​

ecdsa_verify/4 determines if a given signature is valid as per the ECDSA algorithm for the provided data, using the specified public key.

The signature is as follows:

ecdsa_verify(+PubKey, +Data, +Signature, +Options), which is semi-deterministic.

Where:

  • PubKey is the 33-byte compressed public key, as specified in section 4.3.6 of ANSI X9.62.

  • Data is the hash of the signed message, which can be either an atom or a list of bytes.

  • Signature represents the ASN.1 encoded signature corresponding to the Data.

  • Options are additional configurations for the verification process. Supported options include: encoding(+Format) which specifies the encoding used for the data, and type(+Alg) which chooses the algorithm within the ECDSA family (see below for details).

For Format, the supported encodings are:

  • hex (default), the hexadecimal encoding represented as an atom.
  • octet, the plain byte encoding depicted as a list of integers ranging from 0 to 255.
  • text, the plain text encoding represented as an atom.
  • utf8 (default), the UTF-8 encoding represented as an atom.

For Alg, the supported algorithms are:

  • secp256r1 (default): Also known as P-256 and prime256v1.
  • secp256k1: The Koblitz elliptic curve used in Bitcoin's public-key cryptography.

Examples​

# Verify a signature for hexadecimal data using the ECDSA secp256r1 algorithm.
- ecdsa_verify([127, ...], '9b038f8ef6918cbb56040dfda401b56b...', [23, 56, ...], encoding(hex))

# Verify a signature for binary data using the ECDSA secp256k1 algorithm.
- ecdsa_verify([127, ...], [56, 90, ..], [23, 56, ...], [encoding(octet), type(secp256k1)])