core: replace secp256k with k256 in crypto::ecdsa

substrate/primitives/core/Cargo.toml

@@ -52,9 +52,10 @@ blake2 = { version = "0.10.4", default-features = false, optional = true }
 libsecp256k1 = { version = "0.7", default-features = false, features = ["static-context"], optional = true }
 schnorrkel = { version = "0.11.4", features = ["preaudit_deprecated"], default-features = false }
 merlin = { version = "3.0", default-features = false }
-secp256k1 = { version = "0.28.0", default-features = false, features = ["alloc", "recovery"], optional = true }
 sp-crypto-hashing = { path = "../crypto/hashing", default-features = false, optional = true }
 sp-runtime-interface = { path = "../runtime-interface", default-features = false }
+k256 = { version = "0.13.3", features = ["alloc", "ecdsa"], default-features = false, optional = true }
+secp256k1 = { version = "0.28.0", default-features = false, features = ["alloc", "recovery"], optional = true }
 
 # bls crypto
 w3f-bls = { version = "0.1.3", default-features = false, optional = true }
@@ -75,7 +76,15 @@ harness = false
 bench = false
 
 [features]
-default = ["std"]
+default = ["backend_secp256k1", "std"]
+
+# use secp256k1 crate, better performance, intended to be used on host side
+backend_secp256k1 = [
+	"secp256k1/global-context",
+	"secp256k1/std",
+]
+# use k256 crate, better portability, intended to be used in substrate-runtimes
+backend_k256 = ["k256"]
 std = [
 	"array-bytes",
 	"bandersnatch_vrfs?/std",
@@ -94,6 +103,7 @@ std = [
 	"hash256-std-hasher/std",
 	"impl-serde/std",
 	"itertools",
+	"k256/std",
 	"libsecp256k1/std",
 	"log/std",
 	"merlin/std",
@@ -105,8 +115,6 @@ std = [
 	"rand",
 	"scale-info/std",
 	"schnorrkel/std",
-	"secp256k1/global-context",
-	"secp256k1/std",
 	"secrecy/alloc",
 	"serde/std",
 	"sp-crypto-hashing/std",
@@ -132,6 +140,7 @@ serde = [
 	"bs58/alloc",
 	"dep:serde",
 	"impl-serde",
+	"k256/serde",
 	"primitive-types/serde_no_std",
 	"scale-info/serde",
 	"secrecy/alloc",
@@ -147,7 +156,6 @@ full_crypto = [
 	"blake2",
 	"ed25519-zebra",
 	"libsecp256k1",
-	"secp256k1",
 	"sp-crypto-hashing",
 	"sp-runtime-interface/disable_target_static_assertions",
 ]