Add support for TM secp256k1 (#7838)

* Add secp256k1 support

* Fix test

* Add test in handler_test

* Use table tests

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

crypto/codec/tm.go

@@ -6,6 +6,7 @@ import (
 	tmprotocrypto "github.com/tendermint/tendermint/proto/tendermint/crypto"
 
 	"github.com/cosmos/cosmos-sdk/crypto/keys/ed25519"
+	"github.com/cosmos/cosmos-sdk/crypto/keys/secp256k1"
 	cryptotypes "github.com/cosmos/cosmos-sdk/crypto/types"
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
 )
@@ -17,6 +18,10 @@ func FromTmProtoPublicKey(protoPk tmprotocrypto.PublicKey) (cryptotypes.PubKey,
 		return &ed25519.PubKey{
 			Key: protoPk.Ed25519,
 		}, nil
+	case *tmprotocrypto.PublicKey_Secp256K1:
+		return &secp256k1.PubKey{
+			Key: protoPk.Secp256K1,
+		}, nil
 	default:
 		return nil, sdkerrors.Wrapf(sdkerrors.ErrInvalidType, "cannot convert %v from Tendermint public key", protoPk)
 	}
@@ -31,6 +36,12 @@ func ToTmProtoPublicKey(pk cryptotypes.PubKey) (tmprotocrypto.PublicKey, error)
 				Ed25519: pk.Key,
 			},
 		}, nil
+	case *secp256k1.PubKey:
+		return tmprotocrypto.PublicKey{
+			Sum: &tmprotocrypto.PublicKey_Secp256K1{
+				Secp256K1: pk.Key,
+			},
+		}, nil
 	default:
 		return tmprotocrypto.PublicKey{}, sdkerrors.Wrapf(sdkerrors.ErrInvalidType, "cannot convert %v to Tendermint public key", pk)
 	}