RSA private key DER decode fails without CRT components

Dmitry Belyavsky beldmit at
Tue Aug 31 08:03:58 UTC 2021


First, may I ask you which version of OpenSSL do you use?
Secondly, could you please report the issue via GitHub to make sure that it
will not be lost?

On Tue, Aug 31, 2021 at 10:01 AM Brahmaji K <brahmaji.k at> wrote:

> Hi Team,
> I'm trying to decode the RSA private key which was DER encoded earlier
> without CRT components (p, q, dmp1, dmq1 and iqmp is NULL). I'm using the
> same openssl version for both encoding and decoding, encoding works fine
> but decode fails. In decode, we call EVP_PKEY2PKCS8() function, this is
> failing with below error:
> 469393408:error:0D078079:asn1 encoding routines:asn1_item_embed_d2i:field
> missing:crypto/asn1/tasn_dec.c:425:Field=p, Type=RSAPrivateKey
> The above error is because field p is NULL, but with same p is NULL
> encoding is successful. Any idea why encode is Success but decode fails?
> Thanks and Regards,
> Brahmaji K

SY, Dmitry Belyavsky
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