PKCS encryption schema

tangtong tang__tong at
Fri Sep 25 08:17:46 CEST 2009

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.

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.


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