module huawei-ietf-snmp-ext {

    yang-version 1;

    namespace
      "urn:huawei:yang:huawei-ietf-snmp-ext";

    prefix hw-snmp-ext;

    import ietf-snmp {
      prefix snmp;
    }
    import huawei-extension {
      prefix ext;
    }

    organization
      "Huawei Technologies Co., Ltd.";

    contact
      "Huawei Industrial Base
         Bantian, Longgang
         Shenzhen 518129
         People's Republic of China
         Website: http://www.huawei.com
         Email: support@huawei.com";

    description "Expand ietf-snmp.yang.";

    revision "2020-01-17" {
      description "Initial revision.";
      reference
        "Expand ietf-snmp.yang.";

    }

    ext:task-name "ietf-snmp";

    typedef key-hex-string {
      type string {
        length "2..max";
        pattern
          '([0-9a-fA-F]{2}(:[0-9a-fA-F]{2})*)?';
      }
      description
        "A hexadecimal string with octets represented as hex digits separated by colons.";
    }

    augment /snmp:snmp/snmp:usm/snmp:local/snmp:user/snmp:auth/snmp:protocol {
      description
        "Authentication algorithm.";
      case sha2-224 {
        description
          "SHA224 authentication algorithm.";
        container sha2-224 {
          description
            "Configure SNMPv3 user authen protocol.";
          leaf key {
            type key-hex-string;
            mandatory true;
            description
              "Localized key specified as a list of colon-specified hexadecimal octets.";
          }
        }  // container sha2-224
      }  // case sha2-224

      case sha2-256 {
        description
          "SHA256 authentication algorithml.";
        container sha2-256 {
          description
            "Configure SNMPv3 user authen protocol.";
          leaf key {
            type key-hex-string;
            mandatory true;
            description
              "Localized key specified as a list of colon-specified hexadecimal octets.";
          }
        }  // container sha2-256
      }  // case sha2-256

      case sha2-384 {
        description
          "SHA384 authentication algorithm.";
        container sha2-384 {
          description
            "Configure SNMPv3 user authen protocol.";
          leaf key {
            type key-hex-string;
            mandatory true;
            description
              "Localized key specified as a list of colon-specified hexadecimal octets.";
          }
        }  // container sha2-384
      }  // case sha2-384

      case sha2-512 {
        description
          "SHA512 authentication algorithm.";
        container sha2-512 {
          description
            "Configure SNMPv3 user authen protocol.";
          leaf key {
            type key-hex-string;
            mandatory true;
            description
              "Localized key specified as a list of colon-specified hexadecimal octets.";
          }
        }  // container sha2-512
      }  // case sha2-512
    }

    augment /snmp:snmp/snmp:usm/snmp:remote/snmp:user/snmp:auth/snmp:protocol {
      description
        "SNMPv3 remote user authen protocol.";
      case sha2-224 {
        description
          "SHA224 authentication algorithm.";
        container sha2-224 {
          description
            "Configure SNMPv3 user authen protocol.";
          leaf key {
            type key-hex-string;
            mandatory true;
            description
              "Localized key specified as a list of colon-specified hexadecimal octets.";
          }
        }  // container sha2-224
      }  // case sha2-224

      case sha2-256 {
        description
          "SHA256 authentication algorithm.";
        container sha2-256 {
          description
            "Configure SNMPv3 user authen protocol.";
          leaf key {
            type key-hex-string;
            mandatory true;
            description
              "Localized key specified as a list of colon-specified hexadecimal octets.";
          }
        }  // container sha2-256
      }  // case sha2-256

      case sha2-384 {
        description
          "SHA384 authentication algorithm.";
        container sha2-384 {
          description
            "Configure SNMPv3 user authen protocol.";
          leaf key {
            type key-hex-string;
            mandatory true;
            description
              "Localized key specified as a list of colon-specified hexadecimal octets.";
          }
        }  // container sha2-384
      }  // case sha2-384

      case sha2-512 {
        description
          "SHA512 authentication algorithm.";
        container sha2-512 {
          description
            "Configure SNMPv3 user authen protocol.";
          leaf key {
            type key-hex-string;
            mandatory true;
            description
              "Localized key specified as a list of colon-specified hexadecimal octets.";
          }
        }  // container sha2-512
      }  // case sha2-512
    }
  }  // module huawei-ietf-snmp-ext