description_hash says it accepts Hash(SHA-256) of a description but then fails with error UNKNOWN: description hash is 64 bytes, must be 32

[DimoDonchev]

As far as i know sha-256 result is 64 bytes, but i get the error that the description needs to be 32 bytes. Can someone explain what i should do?

here is my code.

`
// Generate the invoice request
LightningOuterClass.Invoice invoiceRequest = LightningOuterClass.Invoice.newBuilder()
.setValueMsat(100000) // Invoice value in milli-satoshis (1 satoshi = 1000 milli-satoshis)
.setDescriptionHash(ByteString.copyFrom("0004f0d7cf6c4a4d311e48ef6637026718a7d249a1073774a74d1c7c2fffce6b", Charset.defaultCharset()))
.build();

// Generate the invoice
AddInvoiceResponse invoiceResponse;
try {
  invoiceResponse = stub.addInvoice(invoiceRequest);
} catch (StatusRuntimeException e) {
  // Handle error
  System.out.println("Error generating invoice: " + e.getMessage());
  return;
}

`

and i get this error Error generating invoice: UNKNOWN: description hash is 64 bytes, must be 32

[guggero]

A hash is 32 bytes (256bit divided by 8 equals 32byte). But what you have is a hex encoded string, which then has 64 characters. What you need to do is to parse the hex string into raw bytes and use that.