tree 3cea780c4956edec6e4be340cf510a618b794c8c
parent 217eaab310220731646f2a1a0159d71e4eb09d4a
author Adam Langley <agl@google.com> 1429822477 -0700
committer Kenny Root <kroot@google.com> 1429826220 +0000

Ensure BN_asc2bn, BN_dec2bn, and BN_hex2bn never give -0.

When |BN_dec2bn| and |BN_hex2bn| were merged (way back in the initial
BoringSSL change), the neg flag was set too soon and could be cleared by
|BN_add_word|.

This is an import of upstream's c85573cc. The unittest change isn't
included here because bn_test.c has changed significantly in upstream
and BoringSSL unittests aren't run in the Android environment.

Bug: 20523350
Change-Id: Iaf8efe2fe3419218437f5ebb9a15f73559860a0f