firm-dkim
Use this library to create DKIM signatures from your C or C++ applications.
Getting started
Follow these steps to easily sign your e-mails using DomainKeys Identified Mail (DKIM).
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Downloading the library
Just head over to our project download page: Download
Install the library by doing the following:
$ make
# make install
Create an application in either C/C++
1) Add this line to your headers
#include <firm-dkim>
2) Set some settings
/* settings */
char *private_key = "-----BEGIN RSA PRIVATE KEY-----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\ncs9Bre0dpzuQAPQ7e2CLbGSwArllvWn3zZZ3TGytCZCw\n-----END RSA PRIVATE KEY-----";
char *domain = "comfirm.se";
char *selector = "mail1";
3) Set headers
/* headers */
int headerc = 4;
int i = 0;
stringpair **headers = (stringpair**)malloc(sizeof(stringpair*) * headerc);
for (i = 0; i < headerc; ++i) {
headers[i] = (stringpair*)malloc(sizeof(stringpair));
}
headers[0]->key = "From";
headers[0]->value = "\"Comfirm\" <noreply@comfirm.se>";
headers[1]->key = "To";
headers[1]->value = "\"Example\" <john.doe@example.com>";
headers[2]->key = "Subject";
headers[2]->value = "Is dinner ready?";
headers[3]->key = "Message-ID";
headers[3]->value = "<20030712040037.46341.5F8J@football.example.com>";
4) Set the message body
/* body */
char *body = "Hi.\r\n\r\nWe lost the game. Are you hungry yet?\r\n\r\nJoe.";
5) Create the signature
/* create signature */
char *dkim = dkim_create(headers, headerc, body, private_key, domain, selector, 0);
printf ("DKIM-Signature: %s\n", dkim);
6) Free used memory
/* free some memory */
free (dkim);
for (i = 0; i < headerc; ++i) {
free (headers[i]);
}
free (headers);
7) Congratulations!
You've just signed your first e-mail with firm-dkim. See it as the first of many!
Any questions, bugs, or just feel like sending some love?
Head over to our site (contact us) and we will get back to you shortly.