MAC_Using_OpenSSL.txt

# Simple MAC
openssl rand -hex -out key 32
echo -n `cat message.txt``cat key` | openssl sha256


HMAC (keyed Hash based Message Authentication Code)

# Generating a key
openssl rand -out key 16

# Display binary data in Hex format
xxd -p key

# Generate SHA1_HMAC
openssl sha1 -hmac 1130ba6fcfbacd5e5a6d3645314e6e93 -out earth.sha1hmac Earth.txt

# Generate SHA256_HMAC
openssl sha256 -hmac 1130ba6fcfbacd5e5a6d3645314e6e93 -out earth.sha256hmac Earth.txt

# Generating SHA1_HMAC using 'openssl dgst'
openssl dgst -sha1 -hmac 1130ba6fcfbacd5e5a6d3645314e6e93 Earth.txt

# Generating SHA1_HMAC using 'openssl dgst' and outputing to a file.
openssl dgst -sha1 -hmac 1130ba6fcfbacd5e5a6d3645314e6e93 -out earth.sha1hmac Earth.txt

# Generating SHA256_HMAC using 'openssl dgst'
openssl dgst -sha256 -hmac 1130ba6fcfbacd5e5a6d3645314e6e93 Earth.txt

# Alternate way to generate HMAC
openssl dgst -mac hmac -sha1 -macopt hexkey:`xxd -p key` Earth.txt
openssl dgst -mac hmac -sha256 -macopt hexkey:`xxd -p key` Earth.txt

# Generating CMAC digest
openssl dgst -mac cmac -macopt cipher:aes-128-cbc -macopt hexkey:`xxd -p key` -sha1 Earth.txt
openssl dgst -mac cmac -macopt cipher:aes-128-cbc -macopt hexkey:`xxd -p key` -sha256 Earth.txt