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why-not/sign_verify.sh

Last active February 3, 2022 05:49
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Sign and Verify Using Public/Private Keys
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sign_verify.sh
# generate private key
openssl genrsa -out private_key.pem 4096
# extract public key
openssl rsa -in private_key.pem -pubout > public_key.pub
# sign using private key
openssl dgst -sign private_key.pem -keyform PEM -sha256 -out VGG_ILSVRC_16_layers.caffemodel.sign -binary VGG_ILSVRC_16_layers.caffemodel
# extract using public key
openssl dgst -verify public_key.pub -keyform PEM -sha256 -signature VGG_ILSVRC_16_layers.caffemodel.sign -binary VGG_ILSVRC_16_layers.caffemodel
# tamper with the model
echo "Tamper" >> VGG_ILSVRC_16_layers.caffemodel.tamper
# verify tampered file
openssl dgst -verify public_key.pub -keyform PEM -sha256 -signature VGG_ILSVRC_16_layers.caffemodel.sign -binary VGG_ILSVRC_16_layers.caffemodel.tamper
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