Created
December 9, 2013 15:40
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A Bash version of HMAC
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| #!/bin/bash | |
| ############################################################################## | |
| # | |
| # Easy Qiniu Bash SDK | |
| # | |
| # Module: utils/hmac.sh | |
| # | |
| # Author: LIANG Tao | |
| # Weibo: @无锋之刃 | |
| # Email: liangtao@qiniu.com | |
| # amethyst.black@gmail.com | |
| # | |
| # Wiki: http://en.wikipedia.org/wiki/Hash-based_message_authentication_code | |
| # | |
| ############################################################################## | |
| QNC_HMAC_HEX="" | |
| dir=$(dirname $0) | |
| if [[ "${dir}" == "." ]]; then | |
| dir=$(pwd) | |
| fi | |
| function __qnc_hmac_unpack_bytes { | |
| perl -ne 'chomp; print map { "$_ " } (unpack("H*", $_) =~ m/(.{2})/g)' | |
| } # __qnc_hmac_unpack_bytes | |
| function __qnc_hmac_pack_bytes { | |
| perl -ne 'chomp; s/ //g; print pack("H*", $_)' | |
| } # __qnc_hmac_pack_bytes | |
| function __qnc_hmac_calc_key_pad { | |
| local hex=($1) | |
| local pad=$2 | |
| local cnt=$3 | |
| shift 3 | |
| local tmp=0 | |
| for (( i = 0; i < ${cnt}; i += 1 )); do | |
| tmp=$(( 0x${hex[$i]} ^ 0x${pad} )) | |
| hex[$i]=$(printf "%02x" "${tmp}") | |
| done | |
| echo -n "${hex[@]} " | |
| return 0 | |
| } # __qnc_hmac_calc_key_pad | |
| function qnc_hmac_new { | |
| local hash="qnc_$1" | |
| local secret_key=$2 | |
| shift 2 | |
| local block_size="" | |
| block_size=$(${hash}_chunk_size) | |
| # Don't extract the length of the secret key since it would be changed | |
| if [[ "${#secret_key}" -gt "${block_size}" ]]; then | |
| secret_key=$(${hash} "${secret_key}" | __qnc_hmac_unpack_bytes) | |
| else | |
| secret_key=$(echo -n "${secret_key}" | __qnc_hmac_unpack_bytes) | |
| fi | |
| local secret_key_len=$(( ${#secret_key} / 3 )) | |
| if [[ "${secret_key_len}" -lt "${block_size}" ]]; then | |
| for (( i = 0; i < $((${block_size} - ${secret_key_len})); i += 1 )); do | |
| secret_key="${secret_key}00 " | |
| done | |
| fi | |
| local o_key_pad="" | |
| o_key_pad=$(__qnc_hmac_calc_key_pad "${secret_key}" "5C" "${block_size}") | |
| local i_key_pad="" | |
| i_key_pad=$(__qnc_hmac_calc_key_pad "${secret_key}" "36" "${block_size}") | |
| local hash_ctx="" | |
| hash_ctx=$(${hash}_new) | |
| hash_ctx=$(echo -n "${i_key_pad}" | __qnc_hmac_pack_bytes | ${hash}_write "${hash_ctx}") | |
| echo -n "${#o_key_pad} ${o_key_pad}${i_key_pad}${hash} ${hash_ctx}" | |
| return 0 | |
| } # qnc_hmac_new | |
| function __qnc_hmac_calc { | |
| local end=$1 | |
| local ctx=$2 | |
| local msg=$3 | |
| shift 3 | |
| local key_pad_len="${ctx%% *}" | |
| ctx="${ctx#* }" | |
| local o_key_pad="${ctx:0:${key_pad_len}}" | |
| local i_key_pad="${ctx:${key_pad_len}:${key_pad_len}}" | |
| ctx="${ctx:$(( ${key_pad_len} * 2 ))}" | |
| local hash="${ctx%% *}" | |
| local hash_ctx="${ctx#* }" | |
| if [[ "${#end}" -eq 0 ]]; then | |
| hash_ctx=$(${hash}_write "${hash_ctx}" "${msg}") | |
| echo -n "${key_pad_len} ${o_key_pad}${i_key_pad}${hash} ${hash_ctx}" | |
| return 0 | |
| fi | |
| local i_hash="" | |
| i_hash=$(${hash}_sum "${hash_ctx}" "${msg}") | |
| hash_ctx=$(${hash}_new) | |
| hash_ctx=$(echo -n "${o_key_pad}" | __qnc_hmac_pack_bytes | ${hash}_write "${hash_ctx}") | |
| local output="" | |
| output=$(echo -n "${i_hash}" | ${hash}_sum "${hash_ctx}") | |
| if [[ "${#QNC_HMAC_HEX}" -eq 0 ]]; then | |
| echo -n "${output}" | |
| else | |
| echo -n "${output}" | perl -ne 'print unpack("H*", $_);' | |
| fi | |
| return 0 | |
| } # __qnc_hmac_calc | |
| function qnc_hmac_write { | |
| __qnc_hmac_calc '' "$@" | |
| } # qnc_hmac_write | |
| function qnc_hmac_sum { | |
| __qnc_hmac_calc 'END' "$@" | |
| } # qnc_hmac_sum | |
| ###echo -n "abcd" | __qnc_hmac_unpack_bytes | |
| ###echo -n "61 62 63 64 " | __qnc_hmac_pack_bytes | |
| ###source "${dir}/sha1.sh" | |
| ###hmac_ctx=$(qnc_hmac_new "sha1" "12345678") | |
| ###hmac=$(QNC_HMAC_HEX=1 qnc_hmac_sum "${hmac_ctx}" "12345678") | |
| ###echo "${hmac}" |
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