commit 431565e0531eb6cfdaabd2bba8912655898f079b Author: Nick Mathewson nickm@torproject.org Date: Wed Sep 14 14:27:44 2016 -0400

Helper function to see if an ed25519 pk is set. --- src/common/crypto_ed25519.c | 8 ++++++++ src/common/crypto_ed25519.h | 3 +++ 2 files changed, 11 insertions(+)

diff --git a/src/common/crypto_ed25519.c b/src/common/crypto_ed25519.c index 30ed772..809ad12 100644 --- a/src/common/crypto_ed25519.c +++ b/src/common/crypto_ed25519.c @@ -211,6 +211,14 @@ ed25519_keypair_generate(ed25519_keypair_t *keypair_out, int extra_strong) return 0; }

+/** Return true iff 'pubkey' is set to zero (eg to indicate that it is not + * set). */ +int +ed25519_public_key_is_zero(const ed25519_public_key_t *pubkey) +{ + return tor_mem_is_zero((char*)pubkey->pubkey, ED25519_PUBKEY_LEN); +} + /* Return a heap-allocated array that contains <b>msg</b> prefixed by the * string <b>prefix_str</b>. Set <b>final_msg_len_out</b> to the size of the * final array. If an error occured, return NULL. It's the resonsibility of the diff --git a/src/common/crypto_ed25519.h b/src/common/crypto_ed25519.h index 31afc49..5d63d90 100644 --- a/src/common/crypto_ed25519.h +++ b/src/common/crypto_ed25519.h @@ -66,6 +66,9 @@ ed25519_checksig_prefixed(const ed25519_signature_t *signature, const char *prefix_str, const ed25519_public_key_t *pubkey);

+int ed25519_public_key_is_zero(const ed25519_public_key_t *pubkey); + + /** * A collection of information necessary to check an Ed25519 signature. Used * for batch verification.