Quick post for my future reference, and for anyone Googling.
To check the passphrase for a key is correct:
openssl rsa -check -in keyfilename
To change the passphrase for a key:
openssl rsa -des3 -in keyfilename -out newkeyfilename
Simples.
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openssl rsa -des3 -in keyfilename -out newkeyfilename
doesn’t work on OSX. Tunnelblick is logging -> Bad encrypten…