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How to verify a PKCS7 signature in OpenSSL?
This can be verified using openssl pkcs7 -inform der -print_certs -text -in LOCALSIG.DSA or openssl cms -cmsout -inform DER -print -in LOCALSIG.DSA. The certificate is self-signed by our company and in the certificate store. I might need to provide the whole chain of trust. That’s why I added the -noverify option to openssl smime -verify.
How to verify PKCS # 7 ( CMS ) detached signature?
I have a PKCS#7 (i.e., CMS) detached signature of a file that is signed by my signing certificate and then timestamp signed by a TSA that is all generated by an application we wrote.
How to verify detached signature with timestamp with OpenSSL?
I would like to give a third party the original data file and the detached signature file and have the third party verify the signature and trusted timestamp with readily available tools.
How to verify a PKCS7 certificate with wincrypt?
UPDATE: The LOCALSIG.DSA file contains the signers certificate and the signed hash of the LOCALSIG.SF file. This can be verified using openssl pkcs7 -inform der -print_certs -text -in LOCALSIG.DSA or openssl cms -cmsout -inform DER -print -in LOCALSIG.DSA. The certificate is self-signed by our company and in the certificate store.
Which is used to sign data in PKCS # 7?
OpenSSL smime is used to sign the data. Here’s an explanation of the used parameters. OpenSSL asn1parse is used to allocate the signature in the PKCS#7 message. The PKCS#7 message in data.txt.signed has the following (simplified) structure. To locate the signature, issue the following command.
How to extract public key from OpenSSL certificate?
Since the signature is encrypted with RSA, and OpenSSL requires a separate key file to perform RSA encryption, the following command is used to extract the public key from the certificate for use with rsautl. OpenSSL x509 is used to extract the public key.
How to verify PKCS # 7 signed data message?
Below is a description of the steps to take to verify a PKCS#7 signed data message that is signed with a valid signature. Though I imagine these steps will apply to CMS messages for a big part too, I haven’t looked into this. Update 2013-04-12: this post was written to explain all the steps involved in the verification of a PKCS#7 message.
How to verify a signature in OpenSSL smime?
Save and close the file. Use the OpenSSL smime command to verify the signature. Include the -verify option to indicate that the signature needs to be verified, and the -noverify option to indicate that the certificate does not need to be verified. If the signature is valid, the Verification successful message appears.