use jsoniter for json marshal/unmarshal in KMS (#12146)

Signed-off-by: Harshavardhana <harsha@minio.io>

pkg/kms/kms.go

@@ -20,6 +20,8 @@ package kms
 import (
 	"encoding"
 	"encoding/json"
+
+	jsoniter "github.com/json-iterator/go"
 )
 
 // KMS is the generic interface that abstracts over
@@ -106,6 +108,7 @@ func (d *DEK) UnmarshalText(text []byte) error {
 		Ciphertext []byte `json:"ciphertext"`
 	}
 	var v JSON
+	var json = jsoniter.ConfigCompatibleWithStandardLibrary
 	if err := json.Unmarshal(text, &v); err != nil {
 		return err
 	}