Download every HAC (Handbook of Applied Cryptography) chapter

hac.sh

#!/bin/bash

url="https://cacr.uwaterloo.ca/hac/about/"
mkdir hac
cd hac

wget -O "00 TOC.pdf"                                                           "${url}toc3.pdf"
wget -O "01 Overview of cryptograpy.pdf"                                       "${url}chap1.pdf"
wget -O "02 Mathematics Background.pdf"                                        "${url}chap2.pdf"
wget -O "03 Number-Theoretic Reference Problems.pdf"                           "${url}chap3.pdf"
wget -O "04 Public-Key Parameters.pdf"                                         "${url}chap4.pdf"
wget -O "05 Pseudorandom bits and Sequences.pdf"                               "${url}chap5.pdf"
wget -O "06 Stream Ciphers.pdf"                                                "${url}chap6.pdf"
wget -O "07 Block Ciphers.pdf"                                                 "${url}chap7.pdf"
wget -O "08 Public-Key Encryption.pdf"                                         "${url}chap8.pdf"
wget -O "09 Hash Functions and Data Integrity.pdf"                             "${url}chap9.pdf"
wget -O "10 Identification and Entity Authentication.pdf"                      "${url}chap10.pdf"
wget -O "11 Digital Signatures.pdf"                                            "${url}chap11.pdf"
wget -O "12 Key Estabilishment Protocols.pdf"                                  "${url}chap12.pdf"
wget -O "13 Key Management Techniques.pdf"                                     "${url}chap13.pdf"
wget -O "14 Efficient Implementation.pdf"                                      "${url}chap14.pdf"
wget -O "15 Patents and Standards.pdf"                                         "${url}chap15.pdf"
wget -O "16 Bibliography of Papers from Selected Cryptographic Forums.pdf"     "${url}appendix.pdf"
wget -O "17 References.pdf"                                                    "${url}references.pdf"
wget -O "18 Index.pdf"                                                         "${url}index.pdf"


# check if command exists and fail otherwise
command -v pdfunite >/dev/null 2>&1
if [[ $? -ne 0 ]]; then
    echo "Pdfunite required to merge pdfs!"
    exit 1
fi

pdfunite *.pdf hac.pdf