X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning%2Fsrc%2Futil%2Fcrypto.rs;h=7352542605070c7812201d0a10f35f65eaa3b3e4;hb=ec3aa494953c7d720370119f673e8e6b3a2155d5;hp=39dfd39b785b048535163756ddc417ff80009ed4;hpb=b8ed4d2608e32128dd5a1dee92911638a4301138;p=rust-lightning

diff --git a/lightning/src/util/crypto.rs b/lightning/src/util/crypto.rs
index 39dfd39b..73525426 100644
--- a/lightning/src/util/crypto.rs
+++ b/lightning/src/util/crypto.rs
@@ -3,6 +3,10 @@ use bitcoin::hashes::hmac::{Hmac, HmacEngine};
 use bitcoin::hashes::sha256::Hash as Sha256;
 use bitcoin::secp256k1::{Message, Secp256k1, SecretKey, ecdsa::Signature, Signing};
 
+use crate::chain::keysinterface::EntropySource;
+
+use core::ops::Deref;
+
 macro_rules! hkdf_extract_expand {
 	($salt: expr, $ikm: expr) => {{
 		let mut hmac = HmacEngine::<Sha256>::new($salt);
@@ -51,3 +55,21 @@ pub fn sign<C: Signing>(ctx: &Secp256k1<C>, msg: &Message, sk: &SecretKey) -> Si
 	let sig = ctx.sign_ecdsa(msg, sk);
 	sig
 }
+
+#[inline]
+pub fn sign_with_aux_rand<C: Signing, ES: Deref>(
+	ctx: &Secp256k1<C>, msg: &Message, sk: &SecretKey, entropy_source: &ES
+) -> Signature where ES::Target: EntropySource {
+	#[cfg(feature = "grind_signatures")]
+	let sig = loop {
+		let sig = ctx.sign_ecdsa_with_noncedata(msg, sk, &entropy_source.get_secure_random_bytes());
+		if sig.serialize_compact()[0] < 0x80 {
+			break sig;
+		}
+	};
+	#[cfg(all(not(feature = "grind_signatures"), not(feature = "_test_vectors")))]
+	let sig = ctx.sign_ecdsa_with_noncedata(msg, sk, &entropy_source.get_secure_random_bytes());
+	#[cfg(all(not(feature = "grind_signatures"), feature = "_test_vectors"))]
+	let sig = sign(ctx, msg, sk);
+	sig
+}