* testsuite/rsa-test.c (test_main): Use test_rsa_sha256.

* testsuite/testutils.c (test_rsa_sha256): New function.

Rev: src/nettle/testsuite/rsa-test.c:1.8
Rev: src/nettle/testsuite/testutils.c:1.30
Rev: src/nettle/testsuite/testutils.h:1.25