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SYNOPSIS
       Overview of the bupstash key format.

DESCRIPTION
       Bupstash key files are PEM encoded with one of the following tags:

       O   BUPSTASH KEY

       O   BUPSTASH SUB KEY




       The binary data after decoding the PEM data consists of bare
       https://baremessages.org/ key structures, described below.

       Binary encoding of keys:

       ```

       type PrimaryKey { id: Data16, rollsum_key: Data32,
       data_hash_key_part_1: Data32, data_hash_key_part_2: Data32, data_pk:
       Data32, data_sk: Data32, data_psk: Data32, idx_hash_key_part_1: Data32,
       idx_hash_key_part_2: Data32, idx_pk: Data32, idx_sk: Data32, idx_psk:
       Data32, metadata_pk: Data32, metadata_sk: Data32, metadata_psk: Data32,
       }

       type SubKey { id: Data16, primary_key_id: Data16, rollsum_key:
       OptionData<32>, data_hash_key_part_1: OptionData<32>,
       data_hash_key_part_2: OptionData<32>, data_pk: OptionData<32>, data_sk:
       OptionData<32>, data_psk: OptionData<32>, idx_hash_key_part_1:
       OptionData<32>, idx_hash_key_part_2: OptionData<32>, idx_pk:
       OptionData<32>, idx_sk: OptionData<32>, idx_psk: OptionData<32>,
       metadata_pk: OptionData<32>, metadata_sk: OptionData<32>, metadata_psk:
       OptionData<32>, }

       type Key (PrimaryKey | SubKey) `````` $ bupstash new-key -o
       bupstash.key $ cat bupstash.key # This file contains a cryptographic
       key used by 'bupstash' to encrypt and decrypt data. # #
       key-id=55f32e9db43a1fa3cf65bb3705230898

       ----BEGIN BUPSTASH KEY----
       AFXzLp20Oh+jz2W7NwUjCJgS7VhqV37771UhSRo7LZUIxJCbEZkm27AcYylSL5T2
       bxAE4g0rukxRhloPqWT+s1Yr2cPNEHymMzJzm+V4QiDMzE4K4k548bsrMoQMGXc8
       LRpNiqVzwRRvibkdf9RdnyYPQ5IlvQN395YJVCfiD6nEOY90plDH20UgiGiNLRYK
       xH+MfIoFA1X59UFdto0B/CJW9R98OgQeJNP91NQloFA17mbzhqUvwnHDjatzkxht
       CJWScQm6PTwEFEYRSzLTWgpFXjnpF09quzZenw/jEn6nPAyjb11u+Ohe7pkfxacv
       QZ5qhBMqJ7+H3VpvOLW7mTmXL3T6gB5W7u2Lg6Y/AwkE ----END BUPSTASH KEY----

       ```

SEE ALSO
       bupstash(1)

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