Generate digest and signature seperately

Jerome Baum jerome at
Mon Jun 13 19:03:15 CEST 2011

> I would like to have the possibility to pass the hash to be signed.

We had a discussion about smart-card signatures here and basically the
issue with passing just a hash is that you can't distinguish data
signatures from certifications/key signatures.

So, you might trust the remote server to give you a correct data hash
(i.e. you'll live with the implications of a manipulated data hash),
but not to give you a key hash. The problem is, you can't distinguish
between these cases.

Jerome Baum
tel +49-1578-8434336
email jerome at
PGP: A0E4 B2D4 94E6 20EE 85BA E45B 63E4 2BD8 C58C 753A
PGP: 2C23 EBFF DF1A 840D 2351 F5F5 F25B A03F 2152 36DA

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