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(Node.js) Create ECSDA Signature using Raw r and s Format (not ASN.1)See more ECC ExamplesDemonstrates how to create an ECDSA signature using the raw r/s format. ECDSA signatures have two equal sized parts, r and s. There are two common formats for encoding the signature:
(a) Concatenating the raw byte array of r and s This example demonstrates how to create a signature that is a byte array of r and s concatenated. Note: This example requires Chilkat v9.5.0.97 or greater.
var os = require('os'); if (os.platform() == 'win32') { if (os.arch() == 'ia32') { var chilkat = require('@chilkat/ck-node21-win-ia32'); } else { var chilkat = require('@chilkat/ck-node21-win64'); } } else if (os.platform() == 'linux') { if (os.arch() == 'arm') { var chilkat = require('@chilkat/ck-node21-arm'); } else if (os.arch() == 'x86') { var chilkat = require('@chilkat/ck-node21-linux32'); } else { var chilkat = require('@chilkat/ck-node21-linux64'); } } else if (os.platform() == 'darwin') { if (os.arch() == 'arm64') { var chilkat = require('@chilkat/ck-node21-mac-m1'); } else { var chilkat = require('@chilkat/ck-node21-macosx'); } } function chilkatExample() { // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // To create an ECDSA signature, the data first needs to be hashed. Then the hash // is signed. var sb = new chilkat.StringBuilder(); sb.Append("The quick brown fox jumps over the lazy dog"); var hash = sb.GetHash("sha256","base64","utf-8"); // Load the ECDSA key to be used for signing. var privKey = new chilkat.PrivateKey(); var success = privKey.LoadPemFile("qa_data/ecc/secp256r1-key-pkcs8.pem"); if (success !== true) { console.log(privKey.LastErrorText); return; } var prng = new chilkat.Prng(); var ecdsa = new chilkat.Ecc(); // Produce a signature that is not ASN.1, but is instead the concatenation // of the raw r and s signature parts. // This feature was added in Chilkat v9.5.0.97 ecdsa.AsnFormat = false; var ecdsaSigBase64 = ecdsa.SignHashENC(hash,"base64",privKey,prng); if (ecdsa.LastMethodSuccess !== true) { console.log(ecdsa.LastErrorText); return; } console.log("ECDSA signature = " + ecdsaSigBase64); // ----------------------------------------------------------- // Now let's verify the signature using the public key. var pubKey = new chilkat.PublicKey(); success = pubKey.LoadFromFile("qa_data/ecc/secp256r1-pubkey.pem"); if (success !== true) { console.log(pubKey.LastErrorText); return; } // Note: When verifying, Chilkat will auto-detect the format for both kinds of ECDSA signatures (ASN.1 or binary r+s) var result = ecdsa.VerifyHashENC(hash,ecdsaSigBase64,"base64",pubKey); if (result == 1) { console.log("Signature is valid."); return; } if (result == 0) { console.log("Signature is invalid."); return; } if (result < 0) { console.log(ecdsa.LastErrorText); console.log("The VerifyHashENC method call failed."); return; } } chilkatExample(); |
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