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I know that crypt in glibc has ${scheme_token}$ at the start of the hashes in /etc/shadow that can be used to infer the scheme, but dovecot has the actual name of the hashing scheme used included as a prefix to the hash. e.g.

{SHA512-CRYPT}$6$O874ifKnKOTKofd.$dQ5428GEVkN1yHnf4EtXXCIPonyZLLWawME7BI02HqmbbsAsGL308ARM2KIy6Xo7NmWMOEeFoHIgA/kIrtB0h1

{ARGON2I}$argon2i$v=19$m=32768,t=4,p=1$HWFJUaoRxrV4seklZ2k+cw$jedriavwKU/ZH1e1quhM03O4CaMKA40T2+OF7htkJl4

Did any other program do this before dovecot?

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    openldap uses {crypt}$<schem>$salt... which makes sense. Those {SHA512-}, {ARGON2I} look redundant. Commented Nov 4 at 16:03
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    (looks like that was added around 1998) Commented Nov 4 at 16:13
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    I believe openLDAP did this sooner also Commented Nov 4 at 18:29
  • Thanks. RFC2307 from 1998-Mar seems to be a good candidate for the origin of this style. Commented Nov 5 at 15:02

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