O'Reilly's OpenSSL book has a whole chapter on how to write programs that does tool job. Ch 10.4 is on PKCS#7/SMIME.

http://www.oreilly.com/catalog/openssl/#

Max

camino (sent by Nabble.com) wrote:
i have a signed letter,
how can i extract the certificate from it ?

and in command line  i can use
openssl smime -pk7out -in messagefile | openssl pkcs7 -print_certs
but i wonder  how to achieve it in program

and there are many cases
that i know how to achieve in command-line
but don't know how to in program

thanks
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