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#Error: Can't locate Crypt/Digest/SHA256.pm in @INC (you may need to install the Crypt::Digest::SHA256 module)
#Converted to bash script, thanks ChatGPT for that.

#!/bin/bash

# Function to decrypt
decrypt() {
    input=$1
    key=$2
    decrypted=""

    # Perform XOR decrypt operation with the key
    for ((i=0; i<${#input}; i++)); do
        char="${input:$i:1}"
        key_char="${key:$((i % ${#key})):1}"
        decrypted_char=$(printf \\$(printf '%03o' $((0x$(printf '%02x' "'$char") ^ 0x$(printf '%02x' "'$key_char")))))
        decrypted+="$decrypted_char"
    done

    # Run substitution cipher
    snow_key="001011100001011011100110100101100100111011101110"
    snow_decrypt=""
    for ((i=${#snow_key}-1; i>=0; i--)); do
        snow_decrypt+="${snow_key:$i:1}"
    done

    for ((i=0; i<${#snow_decrypt}; i+=8)); do
        if [ $i -eq 0 ]; then
            decrypted=$(printf \\$(printf '%03o' $((2#${snow_decrypt:0:8}))))
            continue
        fi
        decrypted+=$(printf \\$(printf '%03o' $((2#${snow_decrypt:$i:8}))))
    done

    echo "$decrypted"
}

# Get hash of whitepaper
input_file="bitcoin.pdf"
sha256_hex=$(md5sum "$input_file" | awk '{print $1}')

# Decrypt using key
key="CraigS"
echo "$(decrypt "$sha256_hex" "$key")"