Add support for pbkdf2 key derivation with iterations, and make this the default#126

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jmurty wants to merge 7 commits intomainfrom

Commits on Aug 31, 2021

Target a version 3 release with breaking changes, at least for now
jmurty
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Accept cipher setting containing multiple components like 'aes-256-cbc:pbkdf2:1024'
jmurty
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Re-key sensitive_file to use cipher 'aes-256-cbc:pbkdf2:1024'
jmurty
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Update README for new default "cipher": 'aes-256-cbc:pbkdf2:1024'
jmurty
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Silence shellcheck SC2155 warnings for long-lived code that's fine
jmurty
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Update passphrase hash MD5 => SHA512 for compound "cipher"
jmurty
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Re-key sensitive_file with SHA512 passphrase hash
jmurty
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