jakob/asc-key-to-qr-code
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Switched to using bash arrays to hold split versions of key instead of temp files.

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This commit is contained in:
Brock A. Martin 2016-07-17 13:41:41 -05:00
parent 1eda87d5fb
commit d48e5707c3
2 changed files with 26 additions and 41 deletions
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39
asc2qr.sh
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@ -28,7 +28,7 @@
# Maximum chuck size to send to the QR encoder. QR version 40 supports
# 2,953 bytes of storage.
file_split_size=2800
max_qr_bytes=2800
# Prefix string for the PNG images that are produced
image_prefix="QR"
@ -45,38 +45,27 @@ if [ ! -f ${asc_key} ]; then
exit 1
fi
# Create a temp file to use as a pattern for splitting the input key file.
# This helps protect against file collisions in the current directory.
export TMPDIR=""
tmp_file=$(mktemp keyparts.XXXXXX)
if [ $? -ne 0 ]; then
echo "failed to create temporary file"
exit 1
## Split the key file into usable chunks that the QR encoder can consume
chunks=()
while true; do
s=$( head -c ${max_qr_bytes} )
echo "$s"
if [ ${#s} -gt 0 ]; then
chunks+=("${s}")
else
break
fi
done <<< "$( cat ${asc_key} )"
# Split the key file into usable chunks that the QR encoder can consume
split -b ${file_split_size} ${asc_key} "${tmp_file}."
# For each chunk, encode it into a qc image
## For each chunk, encode it into a qr image
index=1
for file in ${tmp_file}.*; do
for c in "${chunks[@]}"; do
img="${image_prefix}${index}.png"
echo "generating ${img}"
cat ${file} | qrencode -o ${img}
echo -n "${c}" | qrencode -o ${img}
if [ $? -ne 0 ]; then
echo "failed to encode image"
exit 2
fi
index=$((index+1))
done
# Find the correct secure deletion utility (srm on Mac, shred on Linux)
sec_del="srm"
which ${sec_del} 2>&1 1>/dev/null
if [ $? -ne 0 ]; then
sec_del="shred --remove"
fi
# Securely clean up temporary files
${sec_del} ${tmp_file}
${sec_del} ${tmp_file}.*

22
qr2asc.sh
View file

@ -43,6 +43,7 @@ if [ $? -ne 0 ]; then
fi
# For each image on the command line, decode it into text
chunks=()
index=1
for img in "$@"; do
if [ ! -f ${img} ]; then
@ -51,24 +52,19 @@ for img in "$@"; do
fi
asc_key="${tmp_file}.${index}"
echo "decoding ${img}"
zbarimg --raw ${img} 2>/dev/null | perl -p -e 'chomp if eof' > ${asc_key}
chunk=$( zbarimg --raw ${img} 2>/dev/null | perl -p -e 'chomp if eof' )
if [ $? -ne 0 ]; then
echo "failed to decode QR image"
exit 2
fi
chunks+=("${chunk}")
index=$((index+1))
done
asc_key=""
for c in "${chunks[@]}"; do
asc_key+="${c}"
done
echo "creating ${output_key_name}"
cat ${tmp_file}.* > ${output_key_name}
# Find the correct secure deletion utility (srm on Mac, shred on Linux)
sec_del="srm"
which ${sec_del} 2>&1 1>/dev/null
if [ $? -ne 0 ]; then
sec_del="shred --remove"
fi
# Securely clean up temporary files
${sec_del} ${tmp_file}
${sec_del} ${tmp_file}.*
echo "${asc_key}" > ${output_key_name}