Generating Public Key Matching BEP for ed25519 Key
Problem:
Using the Go crypto/ed25519 package, the generated public key differs from the expected one provided in a test case using the BEP data.
Cause:
Differing private key formats exist for ed25519. The BEP data uses a 64-byte hashed private key, while the Go package uses a 32-byte hashed private key (prefixed by the 32-byte seed).
Solution:
While it's not possible to convert the BEP private keys to the Go format, a modified version of the Go library can be created to handle the hashed private keys used in the BEP.
Code Modification:
The modified code includes the following functions:
- getPublicKey: Generates the public key from a 64-byte hashed private key.
- sign: Computes the signature using the hashed private key, public key, and message.
<code class="go">func getPublicKey(privateKey []byte) []byte { // ... (extraction of 32-byte hash from 64-byte hashed private key and publicKey generation) ... } func sign(privateKey, publicKey, message []byte) []byte { // ... (extraction of 32-byte hash from 64-byte hashed private key and signature computation) ... }</code>
Usage:
With this modified code, the test case can be run, demonstrating that the generated public key and signature match the expected BEP data:
<code class="go">// Using the modified code... fmt.Printf("Calculated key: %x\n", publicKey) fmt.Printf("Expected key: %s\n", expectedPublicKey) keyMatches := expectedPublicKey == hex.EncodeToString(publicKey) fmt.Printf("Public key matches expected: %v\n", keyMatches) // Similarly, check for signature match</code>
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