2
0
mirror of https://github.com/mozilla/cipherscan.git synced 2024-11-22 06:13:42 +01:00

don't calculate sha sums for the certificates over and over

we can use cksum to calculate simple checksum much faster than
with using openssl, so we can compute sums only once
This commit is contained in:
Hubert Kario 2014-07-12 14:17:52 +02:00
parent 1eae0cc71b
commit 0f576c1fbc

View File

@ -48,6 +48,10 @@ TIMEOUT=30
# trust anchors are stored
CAPATH=""
SAVECRT=""
unset known_certs
declare -A known_certs
unset cert_checksums
declare -A cert_checksums
# because running external commands like sleep incurs a fork penalty, we
# first check if it is necessary
@ -184,15 +188,25 @@ test_cipher_on_target() {
for ((i=0; i<$certificate_count; i=i+1 )); do
# extract i'th certificate
local cert=$(awk -v i=$i 'split_after == 1 {n++;split_after=0}
/-----END CERTIFICATE-----/ {split_after=1}
{if (n == i) print }
' <<<"$tmp")
# clean up the cert from junk before BEGIN CERTIFICATE
cert=$(${OPENSSLBIN} x509 <<<"$cert" 2>/dev/null)
local cert=$(awk -v i=$i 'BEGIN { output=0;n=0 }
/-----BEGIN CERTIFICATE-----/ { output=1 }
output==1 { if (n==i) print }
/-----END CERTIFICATE-----/ { output=0; n++ }' <<<"$tmp")
# put the output to an array instead awk '{print $1}'
local cksum=($(cksum <<<"$cert"))
# compare the values not just checksums so that eventual collision
# doesn't mess up results
if [[ ${known_certs[$cksum]} == $cert ]]; then
if [ -n "${current_certificates}" ]; then
current_certificates+=","
fi
current_certificates+="\"${cert_checksums[$cksum]}\""
continue
fi
# compute sha256 fingerprint of the certificate
local sha256sum=$(${OPENSSLBIN} x509 -outform DER <<<"$cert" 2>/dev/null |\
local sha256sum=$(${OPENSSLBIN} x509 -outform DER\
<<<"$cert" 2>/dev/null |\
${OPENSSLBIN} dgst -sha256 -r 2>/dev/null| awk '{print $1}')
# check if it is a CA certificate
@ -238,6 +252,8 @@ test_cipher_on_target() {
current_certificates+=","
fi
current_certificates+="\"${sha256sum}\""
known_certs[$cksum]="$cert"
cert_checksums[$cksum]="$sha256sum"
done
debug "current_certificates: $current_certificates"