PKCS encryption schema

Simon Josefsson simon at
Fri Sep 25 10:14:52 CEST 2009

tangtong <tang__tong at> writes:

> Hi,
> I meet some question when I display an encrypted key info created by openssl. The following steps show the scenario:
> openssl genrsa -des3 -out key1.pem
> openssl pkcs8 -topk8 -in key1.pem -out key2.pem
> certtool -k --infile key2.pem
> |<1>| PKCS encryption schema OID '1.2.840.113549.1.5.3' is unsupported.
> certtool: import error: The cipher type is unsupported.

That is pbeWithMD5AndDES-CBC.  Both MD5 and DES are broken, so I'm not
sure it is worthwhile to support it.  Try the -v2 parameter to openssl
pkcs8, although I'm not sure what the string for any strong cipher would

I would accept a patch that made GnuTLS read files on this format (but
make sure it can't generate them).


> I double check the source codes, it is found only the following schema are supported for a pkcs8 key for gnutls:
> PKCS12_PBE_3DES_SHA1_OID "1.2.840.113549."
> PKCS12_PBE_ARCFOUR_SHA1_OID "1.2.840.113549."
> PKCS12_PBE_RC2_40_SHA1_OID "1.2.840.113549."
> PBES2_OID "1.2.840.113549.1.5.13"
> Only the last one is for PKCS5 schema. According to PKCS8 specification, PKCS8's encryption algorithm is based on PKCS5's encryption schema. I am not sure if this means gnutls dones't fully support PKCS5 and my understanding about PKCS8 and PKCS5 is right or not.
> Regards
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