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Clean up adding padding

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This commit simplifies the adding of padding data in a few places. Rather than adding one or two bytes at a time in a "for" loop, all of the padding is added in one step by extracting it from a long padding string. (The one exception is in run_robot(), where a "for" loop is used to add additional padding in case in which the RSA modulus is longer than the pre-defined padding string.)

Extracting the padding from a long string is faster than using a "for" loop and it makes the debugging file a little cleaner.

The idea is the same as PR #1940.
This commit is contained in:
David Cooper 2022-11-07 13:54:28 -08:00
parent f5d41ff26f
commit e59d6ab9f6
1 changed files with 13 additions and 31 deletions
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testssl.sh
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@ -12687,6 +12687,7 @@ poly1305_mac() {
local -i d0 d1 d2 d3 d4 local -i d0 d1 d2 d3 d4
local -i g0 g1 g2 g3 g4 local -i g0 g1 g2 g3 g4
local -i i c f blocksize hibit local -i i c f blocksize hibit
local padding="00000000000000000000000000000000"
# poly1305_key_gen - RFC 8439, Section 2.6 # poly1305_key_gen - RFC 8439, Section 2.6
# The MAC key is actually just the first 64 characters (32 bytes) of the # The MAC key is actually just the first 64 characters (32 bytes) of the
@ -12699,19 +12700,11 @@ poly1305_mac() {
msg="$aad" msg="$aad"
aad_len=$((${#aad}/2)) aad_len=$((${#aad}/2))
bytes=$(( aad_len % 16 )) bytes=$(( aad_len % 16 ))
if [[ $bytes -ne 0 ]]; then [[ $bytes -ne 0 ]] && msg+="${padding:0:$((2*(16-bytes)))}"
for (( i=bytes; i < 16; i++ )); do
msg+="00"
done
fi
msg+="$ciphertext" msg+="$ciphertext"
ciphertext_len=$((${#ciphertext}/2)) ciphertext_len=$((${#ciphertext}/2))
bytes=$(( ciphertext_len % 16 )) bytes=$(( ciphertext_len % 16 ))
if [[ $bytes -ne 0 ]]; then [[ $bytes -ne 0 ]] && msg+="${padding:0:$((2*(16-bytes)))}"
for (( i=bytes; i < 16; i++ )); do
msg+="00"
done
fi
msg+="$(u64to8 $aad_len)$(u64to8 $ciphertext_len)" msg+="$(u64to8 $aad_len)$(u64to8 $ciphertext_len)"
bytes="${#msg}" bytes="${#msg}"
@ -12740,10 +12733,7 @@ poly1305_mac() {
else else
blocksize=$bytes blocksize=$bytes
hibit=0 hibit=0
msg+="01" msg+="01${padding:0:$((30-bytes))}"
for (( i=bytes+2; i < 32; i+=2 )); do
msg+="00"
done
fi fi
h0+=$(( $(u8to32 "${msg:0:8}") & 0x3ffffff )) h0+=$(( $(u8to32 "${msg:0:8}") & 0x3ffffff ))
h1+=$(( ($(u8to32 "${msg:6:8}") >> 2) & 0x3ffffff )) h1+=$(( ($(u8to32 "${msg:6:8}") >> 2) & 0x3ffffff ))
@ -12874,6 +12864,7 @@ ccm-compute-tag() {
local -i tag_len="$6" local -i tag_len="$6"
local b tag local b tag
local -i i aad_len plaintext_len final_block_len nr_blocks local -i i aad_len plaintext_len final_block_len nr_blocks
local padding_bytes="00000000000000000000000000000000"
aad_len=$((${#aad}/2)) aad_len=$((${#aad}/2))
plaintext_len=$((${#plaintext}/2)) plaintext_len=$((${#plaintext}/2))
@ -12909,21 +12900,13 @@ ccm-compute-tag() {
return 7 return 7
fi fi
# Add padding to complete block # Add padding to complete block
if [[ $final_block_len -ne 0 ]]; then [[ $final_block_len -ne 0 ]] && b+="${padding_bytes:0:$((2*(16-final_block_len)))}"
for (( i=final_block_len; i < 16; i++ )); do
b+="00"
done
fi
fi fi
# Finally add the plaintext and any padding needed to complete block # Finally add the plaintext and any padding needed to complete block
b+="$plaintext" b+="$plaintext"
final_block_len=$((plaintext_len % 16)) final_block_len=$((plaintext_len % 16))
if [[ $final_block_len -ne 0 ]]; then [[ $final_block_len -ne 0 ]] && b+="${padding_bytes:0:$((2*(16-final_block_len)))}"
for (( i=final_block_len; i < 16; i++ )); do
b+="00"
done
fi
# Compute the authentication tag as described in # Compute the authentication tag as described in
# Sections 6.1 and 6.2 of NIST SP 800-38C. # Sections 6.1 and 6.2 of NIST SP 800-38C.
@ -15156,6 +15139,7 @@ prepare_tls_clienthello() {
local extensions_key_share="" extn_type supported_groups_c2n="" extn_psk_mode="" local extensions_key_share="" extn_type supported_groups_c2n="" extn_psk_mode=""
local extra_extensions extra_extensions_list="" extension_supported_versions="" local extra_extensions extra_extensions_list="" extension_supported_versions=""
local offer_compression=false compression_methods local offer_compression=false compression_methods
local padding_bytes="\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00"
# TLSv1.3 ClientHello messages MUST specify only the NULL compression method. # TLSv1.3 ClientHello messages MUST specify only the NULL compression method.
[[ "$5" == true ]] && [[ "0x$tls_low_byte" -le "0x03" ]] && offer_compression=true [[ "$5" == true ]] && [[ "0x$tls_low_byte" -le "0x03" ]] && offer_compression=true
@ -15466,17 +15450,14 @@ prepare_tls_clienthello() {
fi fi
len_padding_extension_hex=$(printf "%02x\n" $len_padding_extension) len_padding_extension_hex=$(printf "%02x\n" $len_padding_extension)
len2twobytes "$len_padding_extension_hex" len2twobytes "$len_padding_extension_hex"
all_extensions="$all_extensions\\x00\\x15\\x${LEN_STR:0:2}\\x${LEN_STR:4:2}" all_extensions+="\\x00\\x15\\x${LEN_STR:0:2}\\x${LEN_STR:4:2}${padding_bytes:0:$((4*len_padding_extension))}"
for (( i=0; i<len_padding_extension; i++ )); do
all_extensions="$all_extensions\\x00"
done
len_extension=$len_extension+$len_padding_extension+0x4 len_extension=$len_extension+$len_padding_extension+0x4
len_extension_hex=$(printf "%02x\n" $len_extension) len_extension_hex=$(printf "%02x\n" $len_extension)
elif [[ ! "$extra_extensions_list" =~ \ 0015\ ]] && [[ $((len_all%256)) -eq 10 || $((len_all%256)) -eq 14 ]]; then elif [[ ! "$extra_extensions_list" =~ \ 0015\ ]] && [[ $((len_all%256)) -eq 10 || $((len_all%256)) -eq 14 ]]; then
# Some servers fail if the length of the ClientHello is 522, 778, 1034, 1290, ... bytes. # Some servers fail if the length of the ClientHello is 522, 778, 1034, 1290, ... bytes.
# A few servers also fail if the length is 526, 782, 1038, 1294, ... bytes. # A few servers also fail if the length is 526, 782, 1038, 1294, ... bytes.
# So, if the ClientHello would be one of these length, add a 5-byte padding extension. # So, if the ClientHello would be one of these length, add a 5-byte padding extension.
all_extensions="$all_extensions\\x00\\x15\\x00\\x01\\x00" all_extensions+="\\x00\\x15\\x00\\x01\\x00"
len_extension+=5 len_extension+=5
len_extension_hex=$(printf "%02x\n" $len_extension) len_extension_hex=$(printf "%02x\n" $len_extension)
fi fi
@ -19393,6 +19374,7 @@ run_robot() {
local aes_gcm_cbc_cipherlist="00,9d, 00,9c, 00,3d, 00,35, 00,3c, 00,2f" local aes_gcm_cbc_cipherlist="00,9d, 00,9c, 00,3d, 00,35, 00,3c, 00,2f"
local padded_pms encrypted_pms cke_prefix client_key_exchange rnd_pad local padded_pms encrypted_pms cke_prefix client_key_exchange rnd_pad
local rnd_pms="aa112233445566778899112233445566778899112233445566778899112233445566778899112233445566778899" local rnd_pms="aa112233445566778899112233445566778899112233445566778899112233445566778899112233445566778899"
local rnd_padding_bytes="abcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcd"
local change_cipher_spec finished resp local change_cipher_spec finished resp
local -a response local -a response
local -i i subret len iteration testnum pubkeybytes local -i i subret len iteration testnum pubkeybytes
@ -19498,8 +19480,8 @@ run_robot() {
pubkeybits="${pubkeybits%%bit*}" pubkeybits="${pubkeybits%%bit*}"
pubkeybytes=$pubkeybits/8 pubkeybytes=$pubkeybits/8
[[ $((pubkeybits%8)) -ne 0 ]] && pubkeybytes+=1 [[ $((pubkeybits%8)) -ne 0 ]] && pubkeybytes+=1
rnd_pad="" rnd_pad="${rnd_padding_bytes:0:$((2*(pubkeybytes-51)))}"
for (( len=0; len < pubkeybytes-52; len+=2 )); do for (( len=$((${#rnd_pad}/2)); len < pubkeybytes-52; len+=2 )); do
rnd_pad+="abcd" rnd_pad+="abcd"
done done
[[ $len -eq $pubkeybytes-52 ]] && rnd_pad+="ab" [[ $len -eq $pubkeybytes-52 ]] && rnd_pad+="ab"