type_url: "type.googleapis.com/google.crypto.tink.AesGcmHkdfStreamingKey"
# value: [type.googleapis.com/google.crypto.tink.AesGcmHkdfStreamingKeyFormat] {
#   version: 0
#   params {
#     ciphertext_segment_size: 4096
#     derived_key_size: 16
#     hkdf_hash_type: SHA256
#   }
#   key_size: 16
# }
value: "\n\007\010\200 \020\020\030\003\020\020"
output_prefix_type: RAW