///
/// [BIP 340]: https://github.com/bitcoin/bips/blob/master/bip-0340.mediawiki
/// [BOLT 12]: https://github.com/rustyrussell/lightning-rfc/blob/guilt/offers/12-offer-encoding.md#signature-calculation
-#[derive(Debug, PartialEq)]
-pub struct TaggedHash(Message);
+#[derive(Clone, Debug, PartialEq)]
+pub struct TaggedHash {
+ tag: &'static str,
+ merkle_root: sha256::Hash,
+ digest: Message,
+}
impl TaggedHash {
/// Creates a tagged hash with the given parameters.
///
/// Panics if `tlv_stream` is not a well-formed TLV stream containing at least one TLV record.
- pub(super) fn new(tag: &str, tlv_stream: &[u8]) -> Self {
- Self(message_digest(tag, tlv_stream))
+ pub(super) fn new(tag: &'static str, tlv_stream: &[u8]) -> Self {
+ let tag_hash = sha256::Hash::hash(tag.as_bytes());
+ let merkle_root = root_hash(tlv_stream);
+ let digest = Message::from_slice(tagged_hash(tag_hash, merkle_root).as_byte_array()).unwrap();
+ Self {
+ tag,
+ merkle_root,
+ digest,
+ }
}
/// Returns the digest to sign.
pub fn as_digest(&self) -> &Message {
- &self.0
+ &self.digest
+ }
+
+ /// Returns the tag used in the tagged hash.
+ pub fn tag(&self) -> &str {
+ &self.tag
+ }
+
+ /// Returns the merkle root used in the tagged hash.
+ pub fn merkle_root(&self) -> sha256::Hash {
+ self.merkle_root
}
}
Ok(signature)
}
-/// Verifies the signature with a pubkey over the given bytes using a tagged hash as the message
+/// Verifies the signature with a pubkey over the given message using a tagged hash as the message
/// digest.
-///
-/// Panics if `bytes` is not a well-formed TLV stream containing at least one TLV record.
pub(super) fn verify_signature(
- signature: &Signature, tag: &str, bytes: &[u8], pubkey: PublicKey,
+ signature: &Signature, message: &TaggedHash, pubkey: PublicKey,
) -> Result<(), secp256k1::Error> {
- let digest = message_digest(tag, bytes);
+ let digest = message.as_digest();
let pubkey = pubkey.into();
let secp_ctx = Secp256k1::verification_only();
- secp_ctx.verify_schnorr(signature, &digest, &pubkey)
-}
-
-pub(super) fn message_digest(tag: &str, bytes: &[u8]) -> Message {
- let tag = sha256::Hash::hash(tag.as_bytes());
- let merkle_root = root_hash(bytes);
- Message::from_slice(&tagged_hash(tag, merkle_root)).unwrap()
+ secp_ctx.verify_schnorr(signature, digest, &pubkey)
}
/// Computes a merkle root hash for the given data, which must be a well-formed TLV stream
use super::{SIGNATURE_TYPES, TlvStream, WithoutSignatures};
use bitcoin::hashes::{Hash, sha256};
- use bitcoin::secp256k1::{KeyPair, Secp256k1, SecretKey};
+ use bitcoin::hashes::hex::FromHex;
+ use bitcoin::secp256k1::{KeyPair, Message, Secp256k1, SecretKey};
use bitcoin::secp256k1::schnorr::Signature;
use core::convert::Infallible;
use crate::offers::offer::{Amount, OfferBuilder};
use crate::offers::invoice_request::InvoiceRequest;
use crate::offers::parse::Bech32Encode;
+ use crate::offers::test_utils::{payer_pubkey, recipient_pubkey};
use crate::util::ser::Writeable;
#[test]
macro_rules! tlv2 { () => { "02080000010000020003" } }
macro_rules! tlv3 { () => { "03310266e4598d1d3c415f572a8488830b60f7e744ed9235eb0b1ba93283b315c0351800000000000000010000000000000002" } }
assert_eq!(
- super::root_hash(&hex::decode(tlv1!()).unwrap()),
- sha256::Hash::from_slice(&hex::decode("b013756c8fee86503a0b4abdab4cddeb1af5d344ca6fc2fa8b6c08938caa6f93").unwrap()).unwrap(),
+ super::root_hash(&<Vec<u8>>::from_hex(tlv1!()).unwrap()),
+ sha256::Hash::from_slice(&<Vec<u8>>::from_hex("b013756c8fee86503a0b4abdab4cddeb1af5d344ca6fc2fa8b6c08938caa6f93").unwrap()).unwrap(),
);
assert_eq!(
- super::root_hash(&hex::decode(concat!(tlv1!(), tlv2!())).unwrap()),
- sha256::Hash::from_slice(&hex::decode("c3774abbf4815aa54ccaa026bff6581f01f3be5fe814c620a252534f434bc0d1").unwrap()).unwrap(),
+ super::root_hash(&<Vec<u8>>::from_hex(concat!(tlv1!(), tlv2!())).unwrap()),
+ sha256::Hash::from_slice(&<Vec<u8>>::from_hex("c3774abbf4815aa54ccaa026bff6581f01f3be5fe814c620a252534f434bc0d1").unwrap()).unwrap(),
);
assert_eq!(
- super::root_hash(&hex::decode(concat!(tlv1!(), tlv2!(), tlv3!())).unwrap()),
- sha256::Hash::from_slice(&hex::decode("ab2e79b1283b0b31e0b035258de23782df6b89a38cfa7237bde69aed1a658c5d").unwrap()).unwrap(),
+ super::root_hash(&<Vec<u8>>::from_hex(concat!(tlv1!(), tlv2!(), tlv3!())).unwrap()),
+ sha256::Hash::from_slice(&<Vec<u8>>::from_hex("ab2e79b1283b0b31e0b035258de23782df6b89a38cfa7237bde69aed1a658c5d").unwrap()).unwrap(),
);
}
fn calculates_merkle_root_hash_from_invoice_request() {
let secp_ctx = Secp256k1::new();
let recipient_pubkey = {
- let secret_key = SecretKey::from_slice(&hex::decode("4141414141414141414141414141414141414141414141414141414141414141").unwrap()).unwrap();
+ let secret_key = SecretKey::from_slice(&<Vec<u8>>::from_hex("4141414141414141414141414141414141414141414141414141414141414141").unwrap()).unwrap();
KeyPair::from_secret_key(&secp_ctx, &secret_key).public_key()
};
let payer_keys = {
- let secret_key = SecretKey::from_slice(&hex::decode("4242424242424242424242424242424242424242424242424242424242424242").unwrap()).unwrap();
+ let secret_key = SecretKey::from_slice(&<Vec<u8>>::from_hex("4242424242424242424242424242424242424242424242424242424242424242").unwrap()).unwrap();
KeyPair::from_secret_key(&secp_ctx, &secret_key)
};
);
assert_eq!(
super::root_hash(&invoice_request.bytes[..]),
- sha256::Hash::from_slice(&hex::decode("608407c18ad9a94d9ea2bcdbe170b6c20c462a7833a197621c916f78cf18e624").unwrap()).unwrap(),
+ sha256::Hash::from_slice(&<Vec<u8>>::from_hex("608407c18ad9a94d9ea2bcdbe170b6c20c462a7833a197621c916f78cf18e624").unwrap()).unwrap(),
);
assert_eq!(
invoice_request.signature(),
- Signature::from_slice(&hex::decode("b8f83ea3288cfd6ea510cdb481472575141e8d8744157f98562d162cc1c472526fdb24befefbdebab4dbb726bbd1b7d8aec057f8fa805187e5950d2bbe0e5642").unwrap()).unwrap(),
+ Signature::from_slice(&<Vec<u8>>::from_hex("b8f83ea3288cfd6ea510cdb481472575141e8d8744157f98562d162cc1c472526fdb24befefbdebab4dbb726bbd1b7d8aec057f8fa805187e5950d2bbe0e5642").unwrap()).unwrap(),
);
}
+ #[test]
+ fn compute_tagged_hash() {
+ let unsigned_invoice_request = OfferBuilder::new("foo".into(), recipient_pubkey())
+ .amount_msats(1000)
+ .build().unwrap()
+ .request_invoice(vec![1; 32], payer_pubkey()).unwrap()
+ .payer_note("bar".into())
+ .build().unwrap();
+
+ // Simply test that we can grab the tag and merkle root exposed by the accessor
+ // functions, then use them to succesfully compute a tagged hash.
+ let tagged_hash = unsigned_invoice_request.as_ref();
+ let expected_digest = unsigned_invoice_request.as_ref().as_digest();
+ let tag = sha256::Hash::hash(tagged_hash.tag().as_bytes());
+ let actual_digest = Message::from_slice(super::tagged_hash(tag, tagged_hash.merkle_root()).as_byte_array())
+ .unwrap();
+ assert_eq!(*expected_digest, actual_digest);
+ }
+
#[test]
fn skips_encoding_signature_tlv_records() {
let secp_ctx = Secp256k1::new();
projects / rust-lightning / blobdiff