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g10: Correctly compute the euclidean distance. 

* g10/tofu.c (write_stats_status): Correctly compute the euclidean
distance.
(show_statistics): Likewise.

--
Signed-off-by: Neal H. Walfield <neal@g10code.com>
This commit is contained in:
Neal H. Walfield 2016-09-14 15:20:33 +02:00
parent ca91caabb5
commit 05b2b13efd
1 changed files with 10 additions and 8 deletions
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18
g10/tofu.c
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@ -2514,16 +2514,17 @@ write_stats_status (estream_t fp,
const char *validity;
unsigned long messages;
/* Use the euclidean distance rather then the sum of the magnitudes
to ensure a balance between verified signatures and encrypted
messages. */
messages = sqrtu32 (signature_count) + sqrtu32 (encryption_count);
/* Use the euclidean distance (m = sqrt(a^2 + b^2)) rather then the
sum of the magnitudes (m = a + b) to ensure a balance between
verified signatures and encrypted messages. */
messages = sqrtu32 (signature_count * signature_count
+ encryption_count * encryption_count);
if (messages < 1)
validity = "1"; /* Key without history. */
else if (messages < sqrtu32 (2 * BASIC_TRUST_THRESHOLD))
else if (messages < 2 * BASIC_TRUST_THRESHOLD)
validity = "2"; /* Key with too little history. */
else if (messages < sqrtu32 (2 * FULL_TRUST_THRESHOLD))
else if (messages < 2 * FULL_TRUST_THRESHOLD)
validity = "3"; /* Key with enough history for basic trust. */
else
validity = "4"; /* Key with a lot of history. */
@ -2758,8 +2759,9 @@ show_statistics (tofu_dbs_t dbs, const char *fingerprint,
" one message to this key and user id!\n"));
/* Cf. write_stats_status */
if (sqrtu32 (encryption_count) + sqrtu32 (signature_count)
< sqrtu32 (2 * BASIC_TRUST_THRESHOLD))
if (sqrtu32 (encryption_count * encryption_count
+ signature_count * signature_count)
< 2 * BASIC_TRUST_THRESHOLD)
show_warning = 1;
}
}