From e7281cf9f5145cd81a9789a91efc8c9f0567cee8 Mon Sep 17 00:00:00 2001
From: Yura Pakhuchiy <pakhuchiy@gmail.com>
Date: Wed, 4 Apr 2018 19:39:56 +0700
Subject: [PATCH] Add GRS curve

---
 bip32.c     | 3 +++
 curves.c    | 1 +
 curves.h    | 1 +
 secp256k1.c | 9 +++++++++
 secp256k1.h | 1 +
 5 files changed, 15 insertions(+)

diff --git a/bip32.c b/bip32.c
index 8fd2d1ebe4..aa044bf8e8 100644
--- a/bip32.c
+++ b/bip32.c
@@ -687,6 +687,9 @@ const curve_info *get_curve_by_name(const char *curve_name) {
 	if (strcmp(curve_name, SECP256K1_DECRED_NAME) == 0) {
 		return &secp256k1_decred_info;
 	}
+	if (strcmp(curve_name, SECP256K1_GROESTL_NAME) == 0) {
+		return &secp256k1_groestl_info;
+	}
 	if (strcmp(curve_name, NIST256P1_NAME) == 0) {
 		return &nist256p1_info;
 	}
diff --git a/curves.c b/curves.c
index f81ea28ad9..5ff645c26e 100644
--- a/curves.c
+++ b/curves.c
@@ -24,6 +24,7 @@
 
 const char SECP256K1_NAME[] = "secp256k1";
 const char SECP256K1_DECRED_NAME[] = "secp256k1-decred";
+const char SECP256K1_GROESTL_NAME[] = "secp256k1-groestl";
 const char NIST256P1_NAME[] = "nist256p1";
 const char ED25519_NAME[] = "ed25519";
 const char ED25519_SHA3_NAME[] = "ed25519-sha3";
diff --git a/curves.h b/curves.h
index 9257dcc10d..5fbab0f413 100644
--- a/curves.h
+++ b/curves.h
@@ -27,6 +27,7 @@
 
 extern const char SECP256K1_NAME[];
 extern const char SECP256K1_DECRED_NAME[];
+extern const char SECP256K1_GROESTL_NAME[];
 extern const char NIST256P1_NAME[];
 extern const char ED25519_NAME[];
 extern const char ED25519_SHA3_NAME[];
diff --git a/secp256k1.c b/secp256k1.c
index 033a346367..0f5ab1afaf 100644
--- a/secp256k1.c
+++ b/secp256k1.c
@@ -72,3 +72,12 @@ const curve_info secp256k1_decred_info = {
 	.hasher_sign = HASHER_BLAKE,
 	.hasher_pubkey = HASHER_BLAKE,
 };
+
+const curve_info secp256k1_groestl_info = {
+	.bip32_name = "Bitcoin seed",
+	.params = &secp256k1,
+	.hasher_bip32 = HASHER_SHA2,
+	.hasher_base58 = HASHER_GROESTLD_TRUNC,
+	.hasher_sign = HASHER_SHA2,
+	.hasher_pubkey = HASHER_SHA2,
+};
diff --git a/secp256k1.h b/secp256k1.h
index 803cde2639..a5442e50c8 100644
--- a/secp256k1.h
+++ b/secp256k1.h
@@ -32,5 +32,6 @@
 extern const ecdsa_curve secp256k1;
 extern const curve_info secp256k1_info;
 extern const curve_info secp256k1_decred_info;
+extern const curve_info secp256k1_groestl_info;
 
 #endif