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Only self-op for now, required peer versions are a bit high:
- OpenSSL 1.0.2-beta
- GnuTLS 3.2.0 (released 2013-05-10) (gnutls-cli only)

calculation of RR.

pkcs11_sign() reuses *sig to store the header and hash, but those might
be larger than the actual sig, causing a buffer overflow.

An overflow can occur when using raw sigs with hashlen > siglen, or when
the RSA key is less than 664 bits long (or less when using hashes
shorter than SHA512)

As siglen is always within the 'low realm' < 32k, an overflow of asnlen
+ hashlen is not possible.

Introduced in 5246ee5c