var_expand_crypt plugin
This plugins provides generic encrypt/decrypt facility for var_expand. It requires functional lib-dcrypt backend. For dovecot-auth process this plugin is automatically usable.
Syntax
args=encrypted_value=%{encrypt;key=value,iv=value,noiv=yes,algo=algorithm,format=base64|hex:field}
args=decrypted_value=%{decrypt;key=value,iv=value,noiv=yes,algo=algorithm,format=base64|hex:field}- key - hex-encoded value
- iv - hex-encoded value
- noiv - whether iv is included in return value
- algo - algorithm name (defaults to aes-256-cbc)
- format - return format
decrypt expects input in base64 or hex format.
NOTE: It is usually best to leave iv management to dovecot, and not use iv and noiv options at all.
Return formats
Without noiv encrypt returns iv$encrypted$. With noiv, just encrypted data is returned. Field(s) are encoded using format.
key and iv must be the length required by the given algorithm.
Example
%{encrypt;key=f1f2f3f4f5f6f7f8f1f2f3f4f5f6f7f8f1f2f3f4f5f6f7f8f1f2f3f4f5f6f7f8:password} = 93736a0f910df27f89210e096e1d639a$966c2b4f3e7487f6acdb836f8d1dc3e0$
%{decrypt;key=f1f2f3f4f5f6f7f8f1f2f3f4f5f6f7f8f1f2f3f4f5f6f7f8f1f2f3f4f5f6f7f8:encrypted} = pass