Move tls_get_cipher_name_pair and get_num_elements to ssl_utils.c

This allow these functions to be defined without having to include ssl.c/misc.c
which pulls in a lot of more dependencies.

Change-Id: I605394d4f3872a168d05bbbe52d90f6d48935865
Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Frank Lichtenheld <frank@lichtenheld.com>
Message-Id: <20231208173346.94820-1-frank@lichtenheld.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg27726.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>

8 files changed, 211 insertions, 208 deletions

diff --git a/src/openvpn/misc.c b/src/openvpn/misc.c
index ce6e4fd..bce63ed 100644
--- a/src/openvpn/misc.c
+++ b/src/openvpn/misc.c
@@ -773,26 +773,6 @@ output_peer_info_env(struct env_set *es, const char *peer_info)
     }
 }
 
-int
-get_num_elements(const char *string, char delimiter)
-{
-    int string_len = strlen(string);
-
-    ASSERT(0 != string_len);
-
-    int element_count = 1;
-    /* Get number of ciphers */
-    for (int i = 0; i < string_len; i++)
-    {
-        if (string[i] == delimiter)
-        {
-            element_count++;
-        }
-    }
-
-    return element_count;
-}
-
 struct buffer
 prepend_dir(const char *dir, const char *path, struct gc_arena *gc)
 {
diff --git a/src/openvpn/misc.h b/src/openvpn/misc.h
index b000b72..70a24dd 100644
--- a/src/openvpn/misc.h
+++ b/src/openvpn/misc.h
@@ -193,20 +193,6 @@ bool validate_peer_info_line(char *line);
 void output_peer_info_env(struct env_set *es, const char *peer_info);
 
 /**
- * Returns the occurrences of 'delimiter' in a string +1
- * This is typically used to find out the number elements in a
- * cipher string or similar that is separated by : like
- *
- *   X25519:secp256r1:X448:secp512r1:secp384r1:brainpoolP384r1
- *
- * @param string        the string to work on
- * @param delimiter     the delimiter to count, typically ':'
- * @return              occrrences of delimiter + 1
- */
-int
-get_num_elements(const char *string, char delimiter);
-
-/**
  * Prepend a directory to a path.
  */
 struct buffer
diff --git a/src/openvpn/ssl.c b/src/openvpn/ssl.c
index 3e3696c..6eddb68 100644
--- a/src/openvpn/ssl.c
+++ b/src/openvpn/ssl.c
@@ -95,152 +95,6 @@ show_tls_performance_stats(void)
 #endif /* ifdef MEASURE_TLS_HANDSHAKE_STATS */
 
 /**
- * SSL/TLS Cipher suite name translation table
- */
-static const tls_cipher_name_pair tls_cipher_name_translation_table[] = {
-    {"ADH-SEED-SHA", "TLS-DH-anon-WITH-SEED-CBC-SHA"},
-    {"AES128-GCM-SHA256", "TLS-RSA-WITH-AES-128-GCM-SHA256"},
-    {"AES128-SHA256", "TLS-RSA-WITH-AES-128-CBC-SHA256"},
-    {"AES128-SHA", "TLS-RSA-WITH-AES-128-CBC-SHA"},
-    {"AES256-GCM-SHA384", "TLS-RSA-WITH-AES-256-GCM-SHA384"},
-    {"AES256-SHA256", "TLS-RSA-WITH-AES-256-CBC-SHA256"},
-    {"AES256-SHA", "TLS-RSA-WITH-AES-256-CBC-SHA"},
-    {"CAMELLIA128-SHA256", "TLS-RSA-WITH-CAMELLIA-128-CBC-SHA256"},
-    {"CAMELLIA128-SHA", "TLS-RSA-WITH-CAMELLIA-128-CBC-SHA"},
-    {"CAMELLIA256-SHA256", "TLS-RSA-WITH-CAMELLIA-256-CBC-SHA256"},
-    {"CAMELLIA256-SHA", "TLS-RSA-WITH-CAMELLIA-256-CBC-SHA"},
-    {"DES-CBC3-SHA", "TLS-RSA-WITH-3DES-EDE-CBC-SHA"},
-    {"DES-CBC-SHA", "TLS-RSA-WITH-DES-CBC-SHA"},
-    {"DH-DSS-SEED-SHA", "TLS-DH-DSS-WITH-SEED-CBC-SHA"},
-    {"DHE-DSS-AES128-GCM-SHA256", "TLS-DHE-DSS-WITH-AES-128-GCM-SHA256"},
-    {"DHE-DSS-AES128-SHA256", "TLS-DHE-DSS-WITH-AES-128-CBC-SHA256"},
-    {"DHE-DSS-AES128-SHA", "TLS-DHE-DSS-WITH-AES-128-CBC-SHA"},
-    {"DHE-DSS-AES256-GCM-SHA384", "TLS-DHE-DSS-WITH-AES-256-GCM-SHA384"},
-    {"DHE-DSS-AES256-SHA256", "TLS-DHE-DSS-WITH-AES-256-CBC-SHA256"},
-    {"DHE-DSS-AES256-SHA", "TLS-DHE-DSS-WITH-AES-256-CBC-SHA"},
-    {"DHE-DSS-CAMELLIA128-SHA256", "TLS-DHE-DSS-WITH-CAMELLIA-128-CBC-SHA256"},
-    {"DHE-DSS-CAMELLIA128-SHA", "TLS-DHE-DSS-WITH-CAMELLIA-128-CBC-SHA"},
-    {"DHE-DSS-CAMELLIA256-SHA256", "TLS-DHE-DSS-WITH-CAMELLIA-256-CBC-SHA256"},
-    {"DHE-DSS-CAMELLIA256-SHA", "TLS-DHE-DSS-WITH-CAMELLIA-256-CBC-SHA"},
-    {"DHE-DSS-SEED-SHA", "TLS-DHE-DSS-WITH-SEED-CBC-SHA"},
-    {"DHE-RSA-AES128-GCM-SHA256", "TLS-DHE-RSA-WITH-AES-128-GCM-SHA256"},
-    {"DHE-RSA-AES128-SHA256", "TLS-DHE-RSA-WITH-AES-128-CBC-SHA256"},
-    {"DHE-RSA-AES128-SHA", "TLS-DHE-RSA-WITH-AES-128-CBC-SHA"},
-    {"DHE-RSA-AES256-GCM-SHA384", "TLS-DHE-RSA-WITH-AES-256-GCM-SHA384"},
-    {"DHE-RSA-AES256-SHA256", "TLS-DHE-RSA-WITH-AES-256-CBC-SHA256"},
-    {"DHE-RSA-AES256-SHA", "TLS-DHE-RSA-WITH-AES-256-CBC-SHA"},
-    {"DHE-RSA-CAMELLIA128-SHA256", "TLS-DHE-RSA-WITH-CAMELLIA-128-CBC-SHA256"},
-    {"DHE-RSA-CAMELLIA128-SHA", "TLS-DHE-RSA-WITH-CAMELLIA-128-CBC-SHA"},
-    {"DHE-RSA-CAMELLIA256-SHA256", "TLS-DHE-RSA-WITH-CAMELLIA-256-CBC-SHA256"},
-    {"DHE-RSA-CAMELLIA256-SHA", "TLS-DHE-RSA-WITH-CAMELLIA-256-CBC-SHA"},
-    {"DHE-RSA-CHACHA20-POLY1305", "TLS-DHE-RSA-WITH-CHACHA20-POLY1305-SHA256"},
-    {"DHE-RSA-SEED-SHA", "TLS-DHE-RSA-WITH-SEED-CBC-SHA"},
-    {"DH-RSA-SEED-SHA", "TLS-DH-RSA-WITH-SEED-CBC-SHA"},
-    {"ECDH-ECDSA-AES128-GCM-SHA256", "TLS-ECDH-ECDSA-WITH-AES-128-GCM-SHA256"},
-    {"ECDH-ECDSA-AES128-SHA256", "TLS-ECDH-ECDSA-WITH-AES-128-CBC-SHA256"},
-    {"ECDH-ECDSA-AES128-SHA", "TLS-ECDH-ECDSA-WITH-AES-128-CBC-SHA"},
-    {"ECDH-ECDSA-AES256-GCM-SHA384", "TLS-ECDH-ECDSA-WITH-AES-256-GCM-SHA384"},
-    {"ECDH-ECDSA-AES256-SHA256", "TLS-ECDH-ECDSA-WITH-AES-256-CBC-SHA256"},
-    {"ECDH-ECDSA-AES256-SHA384", "TLS-ECDH-ECDSA-WITH-AES-256-CBC-SHA384"},
-    {"ECDH-ECDSA-AES256-SHA", "TLS-ECDH-ECDSA-WITH-AES-256-CBC-SHA"},
-    {"ECDH-ECDSA-CAMELLIA128-SHA256", "TLS-ECDH-ECDSA-WITH-CAMELLIA-128-CBC-SHA256"},
-    {"ECDH-ECDSA-CAMELLIA128-SHA", "TLS-ECDH-ECDSA-WITH-CAMELLIA-128-CBC-SHA"},
-    {"ECDH-ECDSA-CAMELLIA256-SHA256", "TLS-ECDH-ECDSA-WITH-CAMELLIA-256-CBC-SHA256"},
-    {"ECDH-ECDSA-CAMELLIA256-SHA", "TLS-ECDH-ECDSA-WITH-CAMELLIA-256-CBC-SHA"},
-    {"ECDH-ECDSA-DES-CBC3-SHA", "TLS-ECDH-ECDSA-WITH-3DES-EDE-CBC-SHA"},
-    {"ECDH-ECDSA-DES-CBC-SHA", "TLS-ECDH-ECDSA-WITH-DES-CBC-SHA"},
-    {"ECDH-ECDSA-RC4-SHA", "TLS-ECDH-ECDSA-WITH-RC4-128-SHA"},
-    {"ECDHE-ECDSA-AES128-GCM-SHA256", "TLS-ECDHE-ECDSA-WITH-AES-128-GCM-SHA256"},
-    {"ECDHE-ECDSA-AES128-SHA256", "TLS-ECDHE-ECDSA-WITH-AES-128-CBC-SHA256"},
-    {"ECDHE-ECDSA-AES128-SHA384", "TLS-ECDHE-ECDSA-WITH-AES-128-CBC-SHA384"},
-    {"ECDHE-ECDSA-AES128-SHA", "TLS-ECDHE-ECDSA-WITH-AES-128-CBC-SHA"},
-    {"ECDHE-ECDSA-AES256-GCM-SHA384", "TLS-ECDHE-ECDSA-WITH-AES-256-GCM-SHA384"},
-    {"ECDHE-ECDSA-AES256-SHA256", "TLS-ECDHE-ECDSA-WITH-AES-256-CBC-SHA256"},
-    {"ECDHE-ECDSA-AES256-SHA384", "TLS-ECDHE-ECDSA-WITH-AES-256-CBC-SHA384"},
-    {"ECDHE-ECDSA-AES256-SHA", "TLS-ECDHE-ECDSA-WITH-AES-256-CBC-SHA"},
-    {"ECDHE-ECDSA-CAMELLIA128-SHA256", "TLS-ECDHE-ECDSA-WITH-CAMELLIA-128-CBC-SHA256"},
-    {"ECDHE-ECDSA-CAMELLIA128-SHA", "TLS-ECDHE-ECDSA-WITH-CAMELLIA-128-CBC-SHA"},
-    {"ECDHE-ECDSA-CAMELLIA256-SHA256", "TLS-ECDHE-ECDSA-WITH-CAMELLIA-256-CBC-SHA256"},
-    {"ECDHE-ECDSA-CAMELLIA256-SHA", "TLS-ECDHE-ECDSA-WITH-CAMELLIA-256-CBC-SHA"},
-    {"ECDHE-ECDSA-CHACHA20-POLY1305", "TLS-ECDHE-ECDSA-WITH-CHACHA20-POLY1305-SHA256"},
-    {"ECDHE-ECDSA-DES-CBC3-SHA", "TLS-ECDHE-ECDSA-WITH-3DES-EDE-CBC-SHA"},
-    {"ECDHE-ECDSA-DES-CBC-SHA", "TLS-ECDHE-ECDSA-WITH-DES-CBC-SHA"},
-    {"ECDHE-ECDSA-RC4-SHA", "TLS-ECDHE-ECDSA-WITH-RC4-128-SHA"},
-    {"ECDHE-RSA-AES128-GCM-SHA256", "TLS-ECDHE-RSA-WITH-AES-128-GCM-SHA256"},
-    {"ECDHE-RSA-AES128-SHA256", "TLS-ECDHE-RSA-WITH-AES-128-CBC-SHA256"},
-    {"ECDHE-RSA-AES128-SHA384", "TLS-ECDHE-RSA-WITH-AES-128-CBC-SHA384"},
-    {"ECDHE-RSA-AES128-SHA", "TLS-ECDHE-RSA-WITH-AES-128-CBC-SHA"},
-    {"ECDHE-RSA-AES256-GCM-SHA384", "TLS-ECDHE-RSA-WITH-AES-256-GCM-SHA384"},
-    {"ECDHE-RSA-AES256-SHA256", "TLS-ECDHE-RSA-WITH-AES-256-CBC-SHA256"},
-    {"ECDHE-RSA-AES256-SHA384", "TLS-ECDHE-RSA-WITH-AES-256-CBC-SHA384"},
-    {"ECDHE-RSA-AES256-SHA", "TLS-ECDHE-RSA-WITH-AES-256-CBC-SHA"},
-    {"ECDHE-RSA-CAMELLIA128-SHA256", "TLS-ECDHE-RSA-WITH-CAMELLIA-128-CBC-SHA256"},
-    {"ECDHE-RSA-CAMELLIA128-SHA", "TLS-ECDHE-RSA-WITH-CAMELLIA-128-CBC-SHA"},
-    {"ECDHE-RSA-CAMELLIA256-SHA256", "TLS-ECDHE-RSA-WITH-CAMELLIA-256-CBC-SHA256"},
-    {"ECDHE-RSA-CAMELLIA256-SHA", "TLS-ECDHE-RSA-WITH-CAMELLIA-256-CBC-SHA"},
-    {"ECDHE-RSA-CHACHA20-POLY1305", "TLS-ECDHE-RSA-WITH-CHACHA20-POLY1305-SHA256"},
-    {"ECDHE-RSA-DES-CBC3-SHA", "TLS-ECDHE-RSA-WITH-3DES-EDE-CBC-SHA"},
-    {"ECDHE-RSA-DES-CBC-SHA", "TLS-ECDHE-RSA-WITH-DES-CBC-SHA"},
-    {"ECDHE-RSA-RC4-SHA", "TLS-ECDHE-RSA-WITH-RC4-128-SHA"},
-    {"ECDH-RSA-AES128-GCM-SHA256", "TLS-ECDH-RSA-WITH-AES-128-GCM-SHA256"},
-    {"ECDH-RSA-AES128-SHA256", "TLS-ECDH-RSA-WITH-AES-128-CBC-SHA256"},
-    {"ECDH-RSA-AES128-SHA384", "TLS-ECDH-RSA-WITH-AES-128-CBC-SHA384"},
-    {"ECDH-RSA-AES128-SHA", "TLS-ECDH-RSA-WITH-AES-128-CBC-SHA"},
-    {"ECDH-RSA-AES256-GCM-SHA384", "TLS-ECDH-RSA-WITH-AES-256-GCM-SHA384"},
-    {"ECDH-RSA-AES256-SHA256", "TLS-ECDH-RSA-WITH-AES-256-CBC-SHA256"},
-    {"ECDH-RSA-AES256-SHA384", "TLS-ECDH-RSA-WITH-AES-256-CBC-SHA384"},
-    {"ECDH-RSA-AES256-SHA", "TLS-ECDH-RSA-WITH-AES-256-CBC-SHA"},
-    {"ECDH-RSA-CAMELLIA128-SHA256", "TLS-ECDH-RSA-WITH-CAMELLIA-128-CBC-SHA256"},
-    {"ECDH-RSA-CAMELLIA128-SHA", "TLS-ECDH-RSA-WITH-CAMELLIA-128-CBC-SHA"},
-    {"ECDH-RSA-CAMELLIA256-SHA256", "TLS-ECDH-RSA-WITH-CAMELLIA-256-CBC-SHA256"},
-    {"ECDH-RSA-CAMELLIA256-SHA", "TLS-ECDH-RSA-WITH-CAMELLIA-256-CBC-SHA"},
-    {"ECDH-RSA-DES-CBC3-SHA", "TLS-ECDH-RSA-WITH-3DES-EDE-CBC-SHA"},
-    {"ECDH-RSA-DES-CBC-SHA", "TLS-ECDH-RSA-WITH-DES-CBC-SHA"},
-    {"ECDH-RSA-RC4-SHA", "TLS-ECDH-RSA-WITH-RC4-128-SHA"},
-    {"EDH-DSS-DES-CBC3-SHA", "TLS-DHE-DSS-WITH-3DES-EDE-CBC-SHA"},
-    {"EDH-DSS-DES-CBC-SHA", "TLS-DHE-DSS-WITH-DES-CBC-SHA"},
-    {"EDH-RSA-DES-CBC3-SHA", "TLS-DHE-RSA-WITH-3DES-EDE-CBC-SHA"},
-    {"EDH-RSA-DES-CBC-SHA", "TLS-DHE-RSA-WITH-DES-CBC-SHA"},
-    {"EXP-DES-CBC-SHA", "TLS-RSA-EXPORT-WITH-DES40-CBC-SHA"},
-    {"EXP-EDH-DSS-DES-CBC-SHA", "TLS-DH-DSS-EXPORT-WITH-DES40-CBC-SHA"},
-    {"EXP-EDH-RSA-DES-CBC-SHA", "TLS-DH-RSA-EXPORT-WITH-DES40-CBC-SHA"},
-    {"EXP-RC2-CBC-MD5", "TLS-RSA-EXPORT-WITH-RC2-CBC-40-MD5"},
-    {"EXP-RC4-MD5", "TLS-RSA-EXPORT-WITH-RC4-40-MD5"},
-    {"NULL-MD5", "TLS-RSA-WITH-NULL-MD5"},
-    {"NULL-SHA256", "TLS-RSA-WITH-NULL-SHA256"},
-    {"NULL-SHA", "TLS-RSA-WITH-NULL-SHA"},
-    {"PSK-3DES-EDE-CBC-SHA", "TLS-PSK-WITH-3DES-EDE-CBC-SHA"},
-    {"PSK-AES128-CBC-SHA", "TLS-PSK-WITH-AES-128-CBC-SHA"},
-    {"PSK-AES256-CBC-SHA", "TLS-PSK-WITH-AES-256-CBC-SHA"},
-    {"PSK-RC4-SHA", "TLS-PSK-WITH-RC4-128-SHA"},
-    {"RC4-MD5", "TLS-RSA-WITH-RC4-128-MD5"},
-    {"RC4-SHA", "TLS-RSA-WITH-RC4-128-SHA"},
-    {"SEED-SHA", "TLS-RSA-WITH-SEED-CBC-SHA"},
-    {"SRP-DSS-3DES-EDE-CBC-SHA", "TLS-SRP-SHA-DSS-WITH-3DES-EDE-CBC-SHA"},
-    {"SRP-DSS-AES-128-CBC-SHA", "TLS-SRP-SHA-DSS-WITH-AES-128-CBC-SHA"},
-    {"SRP-DSS-AES-256-CBC-SHA", "TLS-SRP-SHA-DSS-WITH-AES-256-CBC-SHA"},
-    {"SRP-RSA-3DES-EDE-CBC-SHA", "TLS-SRP-SHA-RSA-WITH-3DES-EDE-CBC-SHA"},
-    {"SRP-RSA-AES-128-CBC-SHA", "TLS-SRP-SHA-RSA-WITH-AES-128-CBC-SHA"},
-    {"SRP-RSA-AES-256-CBC-SHA", "TLS-SRP-SHA-RSA-WITH-AES-256-CBC-SHA"},
-#ifdef ENABLE_CRYPTO_OPENSSL
-    /* OpenSSL-specific group names */
-    {"DEFAULT", "DEFAULT"},
-    {"ALL", "ALL"},
-    {"HIGH", "HIGH"}, {"!HIGH", "!HIGH"},
-    {"MEDIUM", "MEDIUM"}, {"!MEDIUM", "!MEDIUM"},
-    {"LOW", "LOW"}, {"!LOW", "!LOW"},
-    {"ECDH", "ECDH"}, {"!ECDH", "!ECDH"},
-    {"ECDSA", "ECDSA"}, {"!ECDSA", "!ECDSA"},
-    {"EDH", "EDH"}, {"!EDH", "!EDH"},
-    {"EXP", "EXP"}, {"!EXP", "!EXP"},
-    {"RSA", "RSA"}, {"!RSA", "!RSA"},
-    {"kRSA", "kRSA"}, {"!kRSA", "!kRSA"},
-    {"SRP", "SRP"}, {"!SRP", "!SRP"},
-#endif
-    {NULL, NULL}
-};
-
-/**
  * Update the implicit IV for a key_ctx_bi based on TLS session ids and cipher
  * used.
  *
@@ -254,24 +108,6 @@ static const tls_cipher_name_pair tls_cipher_name_translation_table[] = {
 static void
 key_ctx_update_implicit_iv(struct key_ctx *ctx, uint8_t *key, size_t key_len);
 
-const tls_cipher_name_pair *
-tls_get_cipher_name_pair(const char *cipher_name, size_t len)
-{
-    const tls_cipher_name_pair *pair = tls_cipher_name_translation_table;
-
-    while (pair->openssl_name != NULL)
-    {
-        if ((strlen(pair->openssl_name) == len && 0 == memcmp(cipher_name, pair->openssl_name, len))
-            || (strlen(pair->iana_name) == len && 0 == memcmp(cipher_name, pair->iana_name, len)))
-        {
-            return pair;
-        }
-        pair++;
-    }
-
-    /* No entry found, return NULL */
-    return NULL;
-}
 
 /**
  * Limit the reneg_bytes value when using a small-block (<128 bytes) cipher.
diff --git a/src/openvpn/ssl_backend.h b/src/openvpn/ssl_backend.h
index 3854d59..b9466ce 100644
--- a/src/openvpn/ssl_backend.h
+++ b/src/openvpn/ssl_backend.h
@@ -53,15 +53,6 @@
  */
 struct tls_session;
 
-/**
- * Get a tls_cipher_name_pair containing OpenSSL and IANA names for supplied TLS cipher name
- *
- * @param cipher_name   Can be either OpenSSL or IANA cipher name
- * @return              tls_cipher_name_pair* if found, NULL otherwise
- */
-typedef struct { const char *openssl_name; const char *iana_name; } tls_cipher_name_pair;
-const tls_cipher_name_pair *tls_get_cipher_name_pair(const char *cipher_name, size_t len);
-
 /*
  *
  * Functions implemented in ssl.c for use by the backend SSL library
diff --git a/src/openvpn/ssl_mbedtls.c b/src/openvpn/ssl_mbedtls.c
index 9c9167d..cc88484 100644
--- a/src/openvpn/ssl_mbedtls.c
+++ b/src/openvpn/ssl_mbedtls.c
@@ -44,6 +44,7 @@
 #include "mbedtls_compat.h"
 #include "pkcs11_backend.h"
 #include "ssl_common.h"
+#include "ssl_util.h"
 
 #include "ssl_verify_mbedtls.h"
 #include <mbedtls/debug.h>
diff --git a/src/openvpn/ssl_openssl.c b/src/openvpn/ssl_openssl.c
index 82872bf..c30e6a9 100644
--- a/src/openvpn/ssl_openssl.c
+++ b/src/openvpn/ssl_openssl.c
@@ -50,6 +50,7 @@
 #endif
 
 #include "ssl_verify_openssl.h"
+#include "ssl_util.h"
 
 #include <openssl/bn.h>
 #include <openssl/crypto.h>
diff --git a/src/openvpn/ssl_util.c b/src/openvpn/ssl_util.c
index bca6eed..447e739 100644
--- a/src/openvpn/ssl_util.c
+++ b/src/openvpn/ssl_util.c
@@ -114,3 +114,188 @@ options_string_compat_lzo(const char *options, struct gc_arena *gc)
 
     return BSTR(&buf);
 }
+
+/**
+ * SSL/TLS Cipher suite name translation table
+ */
+static const tls_cipher_name_pair tls_cipher_name_translation_table[] = {
+    {"ADH-SEED-SHA", "TLS-DH-anon-WITH-SEED-CBC-SHA"},
+    {"AES128-GCM-SHA256", "TLS-RSA-WITH-AES-128-GCM-SHA256"},
+    {"AES128-SHA256", "TLS-RSA-WITH-AES-128-CBC-SHA256"},
+    {"AES128-SHA", "TLS-RSA-WITH-AES-128-CBC-SHA"},
+    {"AES256-GCM-SHA384", "TLS-RSA-WITH-AES-256-GCM-SHA384"},
+    {"AES256-SHA256", "TLS-RSA-WITH-AES-256-CBC-SHA256"},
+    {"AES256-SHA", "TLS-RSA-WITH-AES-256-CBC-SHA"},
+    {"CAMELLIA128-SHA256", "TLS-RSA-WITH-CAMELLIA-128-CBC-SHA256"},
+    {"CAMELLIA128-SHA", "TLS-RSA-WITH-CAMELLIA-128-CBC-SHA"},
+    {"CAMELLIA256-SHA256", "TLS-RSA-WITH-CAMELLIA-256-CBC-SHA256"},
+    {"CAMELLIA256-SHA", "TLS-RSA-WITH-CAMELLIA-256-CBC-SHA"},
+    {"DES-CBC3-SHA", "TLS-RSA-WITH-3DES-EDE-CBC-SHA"},
+    {"DES-CBC-SHA", "TLS-RSA-WITH-DES-CBC-SHA"},
+    {"DH-DSS-SEED-SHA", "TLS-DH-DSS-WITH-SEED-CBC-SHA"},
+    {"DHE-DSS-AES128-GCM-SHA256", "TLS-DHE-DSS-WITH-AES-128-GCM-SHA256"},
+    {"DHE-DSS-AES128-SHA256", "TLS-DHE-DSS-WITH-AES-128-CBC-SHA256"},
+    {"DHE-DSS-AES128-SHA", "TLS-DHE-DSS-WITH-AES-128-CBC-SHA"},
+    {"DHE-DSS-AES256-GCM-SHA384", "TLS-DHE-DSS-WITH-AES-256-GCM-SHA384"},
+    {"DHE-DSS-AES256-SHA256", "TLS-DHE-DSS-WITH-AES-256-CBC-SHA256"},
+    {"DHE-DSS-AES256-SHA", "TLS-DHE-DSS-WITH-AES-256-CBC-SHA"},
+    {"DHE-DSS-CAMELLIA128-SHA256", "TLS-DHE-DSS-WITH-CAMELLIA-128-CBC-SHA256"},
+    {"DHE-DSS-CAMELLIA128-SHA", "TLS-DHE-DSS-WITH-CAMELLIA-128-CBC-SHA"},
+    {"DHE-DSS-CAMELLIA256-SHA256", "TLS-DHE-DSS-WITH-CAMELLIA-256-CBC-SHA256"},
+    {"DHE-DSS-CAMELLIA256-SHA", "TLS-DHE-DSS-WITH-CAMELLIA-256-CBC-SHA"},
+    {"DHE-DSS-SEED-SHA", "TLS-DHE-DSS-WITH-SEED-CBC-SHA"},
+    {"DHE-RSA-AES128-GCM-SHA256", "TLS-DHE-RSA-WITH-AES-128-GCM-SHA256"},
+    {"DHE-RSA-AES128-SHA256", "TLS-DHE-RSA-WITH-AES-128-CBC-SHA256"},
+    {"DHE-RSA-AES128-SHA", "TLS-DHE-RSA-WITH-AES-128-CBC-SHA"},
+    {"DHE-RSA-AES256-GCM-SHA384", "TLS-DHE-RSA-WITH-AES-256-GCM-SHA384"},
+    {"DHE-RSA-AES256-SHA256", "TLS-DHE-RSA-WITH-AES-256-CBC-SHA256"},
+    {"DHE-RSA-AES256-SHA", "TLS-DHE-RSA-WITH-AES-256-CBC-SHA"},
+    {"DHE-RSA-CAMELLIA128-SHA256", "TLS-DHE-RSA-WITH-CAMELLIA-128-CBC-SHA256"},
+    {"DHE-RSA-CAMELLIA128-SHA", "TLS-DHE-RSA-WITH-CAMELLIA-128-CBC-SHA"},
+    {"DHE-RSA-CAMELLIA256-SHA256", "TLS-DHE-RSA-WITH-CAMELLIA-256-CBC-SHA256"},
+    {"DHE-RSA-CAMELLIA256-SHA", "TLS-DHE-RSA-WITH-CAMELLIA-256-CBC-SHA"},
+    {"DHE-RSA-CHACHA20-POLY1305", "TLS-DHE-RSA-WITH-CHACHA20-POLY1305-SHA256"},
+    {"DHE-RSA-SEED-SHA", "TLS-DHE-RSA-WITH-SEED-CBC-SHA"},
+    {"DH-RSA-SEED-SHA", "TLS-DH-RSA-WITH-SEED-CBC-SHA"},
+    {"ECDH-ECDSA-AES128-GCM-SHA256", "TLS-ECDH-ECDSA-WITH-AES-128-GCM-SHA256"},
+    {"ECDH-ECDSA-AES128-SHA256", "TLS-ECDH-ECDSA-WITH-AES-128-CBC-SHA256"},
+    {"ECDH-ECDSA-AES128-SHA", "TLS-ECDH-ECDSA-WITH-AES-128-CBC-SHA"},
+    {"ECDH-ECDSA-AES256-GCM-SHA384", "TLS-ECDH-ECDSA-WITH-AES-256-GCM-SHA384"},
+    {"ECDH-ECDSA-AES256-SHA256", "TLS-ECDH-ECDSA-WITH-AES-256-CBC-SHA256"},
+    {"ECDH-ECDSA-AES256-SHA384", "TLS-ECDH-ECDSA-WITH-AES-256-CBC-SHA384"},
+    {"ECDH-ECDSA-AES256-SHA", "TLS-ECDH-ECDSA-WITH-AES-256-CBC-SHA"},
+    {"ECDH-ECDSA-CAMELLIA128-SHA256", "TLS-ECDH-ECDSA-WITH-CAMELLIA-128-CBC-SHA256"},
+    {"ECDH-ECDSA-CAMELLIA128-SHA", "TLS-ECDH-ECDSA-WITH-CAMELLIA-128-CBC-SHA"},
+    {"ECDH-ECDSA-CAMELLIA256-SHA256", "TLS-ECDH-ECDSA-WITH-CAMELLIA-256-CBC-SHA256"},
+    {"ECDH-ECDSA-CAMELLIA256-SHA", "TLS-ECDH-ECDSA-WITH-CAMELLIA-256-CBC-SHA"},
+    {"ECDH-ECDSA-DES-CBC3-SHA", "TLS-ECDH-ECDSA-WITH-3DES-EDE-CBC-SHA"},
+    {"ECDH-ECDSA-DES-CBC-SHA", "TLS-ECDH-ECDSA-WITH-DES-CBC-SHA"},
+    {"ECDH-ECDSA-RC4-SHA", "TLS-ECDH-ECDSA-WITH-RC4-128-SHA"},
+    {"ECDHE-ECDSA-AES128-GCM-SHA256", "TLS-ECDHE-ECDSA-WITH-AES-128-GCM-SHA256"},
+    {"ECDHE-ECDSA-AES128-SHA256", "TLS-ECDHE-ECDSA-WITH-AES-128-CBC-SHA256"},
+    {"ECDHE-ECDSA-AES128-SHA384", "TLS-ECDHE-ECDSA-WITH-AES-128-CBC-SHA384"},
+    {"ECDHE-ECDSA-AES128-SHA", "TLS-ECDHE-ECDSA-WITH-AES-128-CBC-SHA"},
+    {"ECDHE-ECDSA-AES256-GCM-SHA384", "TLS-ECDHE-ECDSA-WITH-AES-256-GCM-SHA384"},
+    {"ECDHE-ECDSA-AES256-SHA256", "TLS-ECDHE-ECDSA-WITH-AES-256-CBC-SHA256"},
+    {"ECDHE-ECDSA-AES256-SHA384", "TLS-ECDHE-ECDSA-WITH-AES-256-CBC-SHA384"},
+    {"ECDHE-ECDSA-AES256-SHA", "TLS-ECDHE-ECDSA-WITH-AES-256-CBC-SHA"},
+    {"ECDHE-ECDSA-CAMELLIA128-SHA256", "TLS-ECDHE-ECDSA-WITH-CAMELLIA-128-CBC-SHA256"},
+    {"ECDHE-ECDSA-CAMELLIA128-SHA", "TLS-ECDHE-ECDSA-WITH-CAMELLIA-128-CBC-SHA"},
+    {"ECDHE-ECDSA-CAMELLIA256-SHA256", "TLS-ECDHE-ECDSA-WITH-CAMELLIA-256-CBC-SHA256"},
+    {"ECDHE-ECDSA-CAMELLIA256-SHA", "TLS-ECDHE-ECDSA-WITH-CAMELLIA-256-CBC-SHA"},
+    {"ECDHE-ECDSA-CHACHA20-POLY1305", "TLS-ECDHE-ECDSA-WITH-CHACHA20-POLY1305-SHA256"},
+    {"ECDHE-ECDSA-DES-CBC3-SHA", "TLS-ECDHE-ECDSA-WITH-3DES-EDE-CBC-SHA"},
+    {"ECDHE-ECDSA-DES-CBC-SHA", "TLS-ECDHE-ECDSA-WITH-DES-CBC-SHA"},
+    {"ECDHE-ECDSA-RC4-SHA", "TLS-ECDHE-ECDSA-WITH-RC4-128-SHA"},
+    {"ECDHE-RSA-AES128-GCM-SHA256", "TLS-ECDHE-RSA-WITH-AES-128-GCM-SHA256"},
+    {"ECDHE-RSA-AES128-SHA256", "TLS-ECDHE-RSA-WITH-AES-128-CBC-SHA256"},
+    {"ECDHE-RSA-AES128-SHA384", "TLS-ECDHE-RSA-WITH-AES-128-CBC-SHA384"},
+    {"ECDHE-RSA-AES128-SHA", "TLS-ECDHE-RSA-WITH-AES-128-CBC-SHA"},
+    {"ECDHE-RSA-AES256-GCM-SHA384", "TLS-ECDHE-RSA-WITH-AES-256-GCM-SHA384"},
+    {"ECDHE-RSA-AES256-SHA256", "TLS-ECDHE-RSA-WITH-AES-256-CBC-SHA256"},
+    {"ECDHE-RSA-AES256-SHA384", "TLS-ECDHE-RSA-WITH-AES-256-CBC-SHA384"},
+    {"ECDHE-RSA-AES256-SHA", "TLS-ECDHE-RSA-WITH-AES-256-CBC-SHA"},
+    {"ECDHE-RSA-CAMELLIA128-SHA256", "TLS-ECDHE-RSA-WITH-CAMELLIA-128-CBC-SHA256"},
+    {"ECDHE-RSA-CAMELLIA128-SHA", "TLS-ECDHE-RSA-WITH-CAMELLIA-128-CBC-SHA"},
+    {"ECDHE-RSA-CAMELLIA256-SHA256", "TLS-ECDHE-RSA-WITH-CAMELLIA-256-CBC-SHA256"},
+    {"ECDHE-RSA-CAMELLIA256-SHA", "TLS-ECDHE-RSA-WITH-CAMELLIA-256-CBC-SHA"},
+    {"ECDHE-RSA-CHACHA20-POLY1305", "TLS-ECDHE-RSA-WITH-CHACHA20-POLY1305-SHA256"},
+    {"ECDHE-RSA-DES-CBC3-SHA", "TLS-ECDHE-RSA-WITH-3DES-EDE-CBC-SHA"},
+    {"ECDHE-RSA-DES-CBC-SHA", "TLS-ECDHE-RSA-WITH-DES-CBC-SHA"},
+    {"ECDHE-RSA-RC4-SHA", "TLS-ECDHE-RSA-WITH-RC4-128-SHA"},
+    {"ECDH-RSA-AES128-GCM-SHA256", "TLS-ECDH-RSA-WITH-AES-128-GCM-SHA256"},
+    {"ECDH-RSA-AES128-SHA256", "TLS-ECDH-RSA-WITH-AES-128-CBC-SHA256"},
+    {"ECDH-RSA-AES128-SHA384", "TLS-ECDH-RSA-WITH-AES-128-CBC-SHA384"},
+    {"ECDH-RSA-AES128-SHA", "TLS-ECDH-RSA-WITH-AES-128-CBC-SHA"},
+    {"ECDH-RSA-AES256-GCM-SHA384", "TLS-ECDH-RSA-WITH-AES-256-GCM-SHA384"},
+    {"ECDH-RSA-AES256-SHA256", "TLS-ECDH-RSA-WITH-AES-256-CBC-SHA256"},
+    {"ECDH-RSA-AES256-SHA384", "TLS-ECDH-RSA-WITH-AES-256-CBC-SHA384"},
+    {"ECDH-RSA-AES256-SHA", "TLS-ECDH-RSA-WITH-AES-256-CBC-SHA"},
+    {"ECDH-RSA-CAMELLIA128-SHA256", "TLS-ECDH-RSA-WITH-CAMELLIA-128-CBC-SHA256"},
+    {"ECDH-RSA-CAMELLIA128-SHA", "TLS-ECDH-RSA-WITH-CAMELLIA-128-CBC-SHA"},
+    {"ECDH-RSA-CAMELLIA256-SHA256", "TLS-ECDH-RSA-WITH-CAMELLIA-256-CBC-SHA256"},
+    {"ECDH-RSA-CAMELLIA256-SHA", "TLS-ECDH-RSA-WITH-CAMELLIA-256-CBC-SHA"},
+    {"ECDH-RSA-DES-CBC3-SHA", "TLS-ECDH-RSA-WITH-3DES-EDE-CBC-SHA"},
+    {"ECDH-RSA-DES-CBC-SHA", "TLS-ECDH-RSA-WITH-DES-CBC-SHA"},
+    {"ECDH-RSA-RC4-SHA", "TLS-ECDH-RSA-WITH-RC4-128-SHA"},
+    {"EDH-DSS-DES-CBC3-SHA", "TLS-DHE-DSS-WITH-3DES-EDE-CBC-SHA"},
+    {"EDH-DSS-DES-CBC-SHA", "TLS-DHE-DSS-WITH-DES-CBC-SHA"},
+    {"EDH-RSA-DES-CBC3-SHA", "TLS-DHE-RSA-WITH-3DES-EDE-CBC-SHA"},
+    {"EDH-RSA-DES-CBC-SHA", "TLS-DHE-RSA-WITH-DES-CBC-SHA"},
+    {"EXP-DES-CBC-SHA", "TLS-RSA-EXPORT-WITH-DES40-CBC-SHA"},
+    {"EXP-EDH-DSS-DES-CBC-SHA", "TLS-DH-DSS-EXPORT-WITH-DES40-CBC-SHA"},
+    {"EXP-EDH-RSA-DES-CBC-SHA", "TLS-DH-RSA-EXPORT-WITH-DES40-CBC-SHA"},
+    {"EXP-RC2-CBC-MD5", "TLS-RSA-EXPORT-WITH-RC2-CBC-40-MD5"},
+    {"EXP-RC4-MD5", "TLS-RSA-EXPORT-WITH-RC4-40-MD5"},
+    {"NULL-MD5", "TLS-RSA-WITH-NULL-MD5"},
+    {"NULL-SHA256", "TLS-RSA-WITH-NULL-SHA256"},
+    {"NULL-SHA", "TLS-RSA-WITH-NULL-SHA"},
+    {"PSK-3DES-EDE-CBC-SHA", "TLS-PSK-WITH-3DES-EDE-CBC-SHA"},
+    {"PSK-AES128-CBC-SHA", "TLS-PSK-WITH-AES-128-CBC-SHA"},
+    {"PSK-AES256-CBC-SHA", "TLS-PSK-WITH-AES-256-CBC-SHA"},
+    {"PSK-RC4-SHA", "TLS-PSK-WITH-RC4-128-SHA"},
+    {"RC4-MD5", "TLS-RSA-WITH-RC4-128-MD5"},
+    {"RC4-SHA", "TLS-RSA-WITH-RC4-128-SHA"},
+    {"SEED-SHA", "TLS-RSA-WITH-SEED-CBC-SHA"},
+    {"SRP-DSS-3DES-EDE-CBC-SHA", "TLS-SRP-SHA-DSS-WITH-3DES-EDE-CBC-SHA"},
+    {"SRP-DSS-AES-128-CBC-SHA", "TLS-SRP-SHA-DSS-WITH-AES-128-CBC-SHA"},
+    {"SRP-DSS-AES-256-CBC-SHA", "TLS-SRP-SHA-DSS-WITH-AES-256-CBC-SHA"},
+    {"SRP-RSA-3DES-EDE-CBC-SHA", "TLS-SRP-SHA-RSA-WITH-3DES-EDE-CBC-SHA"},
+    {"SRP-RSA-AES-128-CBC-SHA", "TLS-SRP-SHA-RSA-WITH-AES-128-CBC-SHA"},
+    {"SRP-RSA-AES-256-CBC-SHA", "TLS-SRP-SHA-RSA-WITH-AES-256-CBC-SHA"},
+#ifdef ENABLE_CRYPTO_OPENSSL
+    /* OpenSSL-specific group names */
+    {"DEFAULT", "DEFAULT"},
+    {"ALL", "ALL"},
+    {"HIGH", "HIGH"}, {"!HIGH", "!HIGH"},
+    {"MEDIUM", "MEDIUM"}, {"!MEDIUM", "!MEDIUM"},
+    {"LOW", "LOW"}, {"!LOW", "!LOW"},
+    {"ECDH", "ECDH"}, {"!ECDH", "!ECDH"},
+    {"ECDSA", "ECDSA"}, {"!ECDSA", "!ECDSA"},
+    {"EDH", "EDH"}, {"!EDH", "!EDH"},
+    {"EXP", "EXP"}, {"!EXP", "!EXP"},
+    {"RSA", "RSA"}, {"!RSA", "!RSA"},
+    {"kRSA", "kRSA"}, {"!kRSA", "!kRSA"},
+    {"SRP", "SRP"}, {"!SRP", "!SRP"},
+#endif
+    {NULL, NULL}
+};
+
+const tls_cipher_name_pair *
+tls_get_cipher_name_pair(const char *cipher_name, size_t len)
+{
+    const tls_cipher_name_pair *pair = tls_cipher_name_translation_table;
+
+    while (pair->openssl_name != NULL)
+    {
+        if ((strlen(pair->openssl_name) == len && 0 == memcmp(cipher_name, pair->openssl_name, len))
+            || (strlen(pair->iana_name) == len && 0 == memcmp(cipher_name, pair->iana_name, len)))
+        {
+            return pair;
+        }
+        pair++;
+    }
+
+    /* No entry found, return NULL */
+    return NULL;
+}
+
+int
+get_num_elements(const char *string, char delimiter)
+{
+    int string_len = strlen(string);
+
+    ASSERT(0 != string_len);
+
+    int element_count = 1;
+    /* Get number of ciphers */
+    for (int i = 0; i < string_len; i++)
+    {
+        if (string[i] == delimiter)
+        {
+            element_count++;
+        }
+    }
+
+    return element_count;
+}
diff --git a/src/openvpn/ssl_util.h b/src/openvpn/ssl_util.h
index 4c46f88..b3eaf9f 100644
--- a/src/openvpn/ssl_util.h
+++ b/src/openvpn/ssl_util.h
@@ -66,4 +66,27 @@ unsigned int extract_iv_proto(const char *peer_info);
  */
 const char *options_string_compat_lzo(const char *options, struct gc_arena *gc);
 
-#endif
+/**
+ * Get a tls_cipher_name_pair containing OpenSSL and IANA names for supplied TLS cipher name
+ *
+ * @param cipher_name   Can be either OpenSSL or IANA cipher name
+ * @return              tls_cipher_name_pair* if found, NULL otherwise
+ */
+typedef struct { const char *openssl_name; const char *iana_name; } tls_cipher_name_pair;
+const tls_cipher_name_pair *tls_get_cipher_name_pair(const char *cipher_name, size_t len);
+
+/**
+ * Returns the occurrences of 'delimiter' in a string +1
+ * This is typically used to find out the number elements in a
+ * cipher string or similar that is separated by : like
+ *
+ *   X25519:secp256r1:X448:secp512r1:secp384r1:brainpoolP384r1
+ *
+ * @param string        the string to work on
+ * @param delimiter     the delimiter to count, typically ':'
+ * @return              occrrences of delimiter + 1
+ */
+int
+get_num_elements(const char *string, char delimiter);
+
+#endif /* ifndef SSL_UTIL_H_ */