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Description of problem:
When PKCS#12 file is created using pk12util, it uses hmacWithSHA1 as the PRF for PBKDF2 and only 2000 iterations of that function.

Version-Release number of selected component (if applicable):
nss-3.28.4-8.el7.x86_64

How reproducible:
Always

Steps to Reproduce:
export PKCS#12 file from NSS db using pk12util -o, inspect using openssl pkcs12 or openssl asn1parse

Actual results:
PBKDF2 always uses SHA1 and always uses 2000 iterations

Expected results:
default to SHA256 and higher number of iterations (a million or so, optimally dependent on the speed of CPU)

Additional info:

Created attachment 1343377 [details]
processing times for different ciphers

It will now take about 2s to export key on a 2.6GHz Haswell machine with default settings.
3s if both key and certificate is encrypted with AES-256-CBC.

that seems to me like acceptable performance

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2018:0679