@cityofzion/neon-ledger/lib/utils.js

Neon Ledger integration for Node.js

import { u } from "@cityofzion/neon-core";
/**
 * Converts a signature in DER format to HEX format.
 * @param response - signature in DER format
 * @returns Signature in HEX format (64 bytes)
 */
export function DerToHexSignature(response) {
    const ss = new u.StringStream(response);
    // The first byte is format. It is usually 0x30 (SEQ) or 0x31 (SET)
    // The second byte represents the total length of the DER module.
    ss.read(2);
    // Now we read each field off
    // Each field is encoded with a type byte, length byte followed by the data itself
    ss.read(1); // Read and drop the type
    const r = ss.readVarBytes();
    ss.read(1);
    const s = ss.readVarBytes();
    // We will need to ensure both integers are 32 bytes long
    const integers = [r, s].map((i) => {
        if (i.length < 64) {
            i = "0".repeat(i.length - 64) + i;
        }
        if (i.length > 64) {
            i = i.substr(-64);
        }
        return i;
    });
    return integers.join("");
}
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