Start working on "cute" signatures because why not? Cute signatures are
inspired/ripped of from the signify and minisign design:
Key (URL-Safe, padded base64):
- 2 bytes of version tag (specifies the algorithm)
- 16 bytes of key ID
- Public/Private key (size depending on the version tag)
Signature (raw):
- 2 bytes of version tag (specifies the algorithm)
- Signature depending (size depending on the version tag)
The new scheme uses libsodium and thus the work of
abstracting cryptographic operations from libcrypto should also be
completed. Also, since the key of the signature is provided in the
filename, there shouldn't be a need for ID
There is also the possibility of using epheremal keys for signatures and
sign the package's public key, signature and signing timestamp in the header
such as:
- 2 bytes of version tag
- signing timestamp
- epheremal public key used
- epheremal signature
- signature of the previous sections
EVP_MD_CTX_set_pkey_ctx() is fairly new openssl function, and not
existing in many alternative. Use EVP_MD_CTX_reset() which is slightly
more heavy but more portable. Add also signature buffer lengths to
work with RSA.
- basic digesting and signing apis (subject still to fine tuning)
- update digest code, and adb signing for the thin wrapping layer
- old v1 package and database handling not updated
- default mkpkg file hash to sha256
ref #10744
Aydin Mercan
Timo Teräs