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-rw-r--r--src/util/gen_pkcs3.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/src/util/gen_pkcs3.c b/src/util/gen_pkcs3.c
index ae7e7610a..4be2c581e 100644
--- a/src/util/gen_pkcs3.c
+++ b/src/util/gen_pkcs3.c
@@ -7,6 +7,16 @@
* c99 $(pkg-config --cflags openssl) gen_pkcs3.c $(pkg-config --libs openssl)
*/
+/*
+ * Rationale:
+ * The Diffie-Hellman primes which are embedded into Exim as named primes for
+ * the tls_dhparam option are in the std-crypto.c file. The source for those
+ * comes from various RFCs, where they are given in hexadecimal form.
+ *
+ * This tool provides convenient conversion, to reduce the risk of human
+ * error in transcription.
+ */
+
#include <ctype.h>
#include <errno.h>
#include <stdbool.h>