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hash: initialize return value before calling NSS hash functions

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Some hash functions in the freebl3 library don't support truncated
digests and either return immediately with no update of the output
length, or ignore the length of the output buffer and always write whole
digest.

Initialize the return value to zero to get correct result with the
former.

This is triggered only in the hash unit test. chronyd always provides a
sufficient buffer for the digest.
This commit is contained in:
Miroslav Lichvar
2018-03-19 13:02:47 +01:00
parent 42a85f685e
commit 47921c7c0c
1 changed files with 1 additions and 1 deletions
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2
hash_nss.c
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@@ -78,7 +78,7 @@ HSH_Hash(int id, const unsigned char *in1, unsigned int in1_len,
const unsigned char *in2, unsigned int in2_len, const unsigned char *in2, unsigned int in2_len,
unsigned char *out, unsigned int out_len) unsigned char *out, unsigned int out_len)
{ {
unsigned int ret; unsigned int ret = 0;
NSSLOWHASH_Begin(hashes[id].context); NSSLOWHASH_Begin(hashes[id].context);
NSSLOWHASH_Update(hashes[id].context, in1, in1_len); NSSLOWHASH_Update(hashes[id].context, in1, in1_len);