Fix decoding of ASN.1 LONG and ZLONG items
LONG and ZLONG items (which are OpenSSL private special cases of ASN1_INTEGER) are encoded into DER with padding if the leading octet has the high bit set, where the padding can be 0x00 (for positive numbers) or 0xff (for negative ones). When decoding DER to LONG or ZLONG, the padding wasn't taken in account at all, which means that if the encoded size with padding is one byte more than the size of long, decoding fails. This change fixes that issue. Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/3000)
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201eb73c
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