12/16/2023 0 Comments Openssl unable to load certificateTo encrypt a message with the cms utility, run the following command: openssl cms -encrypt -in message.txt -aes256 -out encrypted.msc If you do not have the ca chain or simply do not care about validating with it, you can add the -noverify flag to the command and remove the -CAfile flag. Where -verify means to verify the signature, -CAfile is the file containing the chain of the signing certificate, -in mail.msg is the signed message, -signer is the signers certificate containing the public key to be used for verification, and -out signedtext.txt is the file to output the signed message. To verify a signed message, run the following command: openssl cms -verify -CAfile -in mail.msg -signer -out signedtext.txt To add an additional signature to the message, just append an additional -signer cert.pem to the command. Where -sign means to digitally sign, -in message.txt is the file containing the message to be signed, -text means to add plain text MIME headers, -out mail.msg will be the signed message, and -signer is the file containing both the private key and email certificate. To sign a plaintext message, run the following command: openssl cms -sign -in message.txt -text -out mail.msg -signer To purchase an Email certificate, we recommend starting the process at The SSL Store. The openssl cms utility will digitally sign, verify, encrypt and decrypt S/MIME version 3.1 mail and messages.Ĭheckout our smime article on how to get an email certificate and extract the public and private key for use in these commands.
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