signer-spark 0.4.2

Spark (Bitcoin L2) transaction signer — secp256k1 ECDSA.
Documentation 
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//! Error types for the Spark signer.

use alloc::string::String;
#[cfg(not(feature = "std"))]
use alloc::string::ToString;

/// Errors from Spark signing operations.
#[derive(Debug, thiserror::Error)]
pub enum Error {
    /// Private key is invalid.
    #[error("invalid key: {0}")]
    InvalidKey(String),
    /// Message format is wrong.
    #[error("invalid message: {0}")]
    InvalidMessage(String),
    /// Signing primitive failed.
    #[error("signing failed: {0}")]
    SigningFailed(String),
    /// Hex decoding failed.
    #[error("hex error: {0}")]
    Hex(hex::FromHexError),
}

impl From<hex::FromHexError> for Error {
    fn from(e: hex::FromHexError) -> Self {
        Self::Hex(e)
    }
}

impl From<signer_primitives::Error> for Error {
    fn from(e: signer_primitives::Error) -> Self {
        Self::InvalidKey(e.to_string())
    }
}