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compute base output key using secp256k1_ec_pubkey_tweak_add #1

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compute base output key using secp256k1_ec_pubkey_tweak_add #1

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14 changes: 3 additions & 11 deletions src/secp256k1_extension.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -622,17 +622,9 @@ inline void ScanSilentPaymentsScalarFun(DataChunk &args, ExpressionState &state,
return false;
}

// Create public key from base shared secret
secp256k1_pubkey base_shared_pubkey;
if (secp256k1_ec_pubkey_create(ctx, &base_shared_pubkey, base_shared_secret) != 1) {
mask.SetInvalid(idx);
return false;
}

// Combine with spend public key to get base output key
const secp256k1_pubkey *base_pubkeys[2] = {&spend_pubkey, &base_shared_pubkey};
secp256k1_pubkey base_output_key;
if (secp256k1_ec_pubkey_combine(ctx, &base_output_key, base_pubkeys, 2) != 1) {
// Get base output key by tweaking spend public key with base shared secret
secp256k1_pubkey base_output_key = spend_pubkey;
if (secp256k1_ec_pubkey_tweak_add(ctx, &base_output_key, base_shared_secret) != 1) {
mask.SetInvalid(idx);
return false;
}
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