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Always create 70 byte signatures with low R values

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When extra entropy is not specified by the caller, CKey::Sign will
now always create a signature that has a low R value and is at most
70 bytes. The resulting signature on the stack will be 71 bytes when
the sighash byte is included.

Using low R signatures means that the resulting DER encoded signature
will never need to have additional padding to account for high R
values.
This commit is contained in:
Andrew Chow
2018-07-14 16:03:28 -07:00
parent 9d86aad287
commit 18dfea0dd0
8 changed files with 70 additions and 22 deletions
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2
src/key.h
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@@ -114,7 +114,7 @@ public:
* Create a DER-serialized signature.
* The test_case parameter tweaks the deterministic nonce.
*/
bool Sign(const uint256& hash, std::vector<unsigned char>& vchSig, uint32_t test_case = 0) const;
bool Sign(const uint256& hash, std::vector<unsigned char>& vchSig, bool grind = true, uint32_t test_case = 0) const;
/**
* Create a compact signature (65 bytes), which allows reconstructing the used public key.