Let's assume that the public key is in a pem encoded X509 file called
x.pem
// Access the file
FILE *fptr=NULL;
fptr = fopen( "x.pem", "r" );
// Read in the certificate to an X509 structure
X509 *cert_A=NULL;
cert_A = PEM_read_X509_AUX( fptr, NULL, NULL, NULL );
// Extract the public key from the cert structure
EVP_PKEY *evp_A=NULL;
evp_A = X509_get_pubkey( cert_A );
Of course you will want to add appropriate error checking around this
and generalize it.
Bill
________________________________
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Ben Hoover
Sent: April 23, 2008 3:17 PM
To: openssl-users@openssl.org
Subject: Extracting Public Key from a File
Hello,
Is there a way to extract a public key from a PEM encoded file and turn
it into an EVP_PKEY struct? Also is there a way to directly extract the
RSA data directly from the file containing the public key and put it
into an RSA struct?
Thank you,
Ben
________________________________
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