OpenVPN sends the cipher name in uppercase, even if it's not standard, thus we have to convert it to lowercase for EVP_get_cipherbyname().
We also have to send the cipher name as it was received from the OpenVPN client, unless it's a different cipher, to prevent a message such as:
"WARNING: 'cipher' is used inconsistently, local='cipher AES-128-GCM', remote='cipher aes-128-gcm'"
It happens because OpenVPN uses "strcmp()" to compare the local and remote parameters: a6fd48ba36/src/openvpn/options.c (L3819-L3831)
See https://github.com/openssl/openssl/issues/6921 for EVP_get_cipherbyname().
/builds/SoftEther/SoftEtherVPN/src/Mayaqua/Encrypt.c: In function 'RsaCheck':
/builds/SoftEther/SoftEtherVPN/src/Mayaqua/Encrypt.c:2307:3: warning: 'RSA_generate_key' is deprecated [-Wdeprecated-declarations]
rsa = RSA_generate_key(bit, RSA_F4, NULL, NULL);
^~~
In file included from /usr/include/openssl/rsa.h:13:0,
from /usr/include/openssl/x509.h:31,
from /usr/include/openssl/ssl.h:50,
from /builds/SoftEther/SoftEtherVPN/src/Mayaqua/Encrypt.c:127:
/usr/include/openssl/rsa.h:193:1: note: declared here
DEPRECATEDIN_0_9_8(RSA *RSA_generate_key(int bits, unsigned long e, void
^
/builds/SoftEther/SoftEtherVPN/src/Mayaqua/Encrypt.c: In function 'RsaGen':
/builds/SoftEther/SoftEtherVPN/src/Mayaqua/Encrypt.c:2377:3: warning: 'RSA_generate_key' is deprecated [-Wdeprecated-declarations]
rsa = RSA_generate_key(bit, RSA_F4, NULL, NULL);
^~~
In file included from /usr/include/openssl/rsa.h:13:0,
from /usr/include/openssl/x509.h:31,
from /usr/include/openssl/ssl.h:50,
from /builds/SoftEther/SoftEtherVPN/src/Mayaqua/Encrypt.c:127:
/usr/include/openssl/rsa.h:193:1: note: declared here
DEPRECATEDIN_0_9_8(RSA *RSA_generate_key(int bits, unsigned long e, void
^
/builds/SoftEther/SoftEtherVPN/src/Mayaqua/Encrypt.c: In function 'X509ToX':
/builds/SoftEther/SoftEtherVPN/src/Mayaqua/Encrypt.c:3435:7: warning: 'ASN1_STRING_data' is deprecated [-Wdeprecated-declarations]
char *uri = (char *)ASN1_STRING_data(ad->location->d.uniformResourceIdentifier);
^~~~
In file included from /usr/include/openssl/bn.h:31:0,
from /usr/include/openssl/asn1.h:24,
from /usr/include/openssl/objects.h:916,
from /usr/include/openssl/evp.h:27,
from /usr/include/openssl/x509.h:23,
from /usr/include/openssl/ssl.h:50,
from /builds/SoftEther/SoftEtherVPN/src/Mayaqua/Encrypt.c:127:
/usr/include/openssl/asn1.h:553:1: note: declared here
DEPRECATEDIN_1_1_0(unsigned char *ASN1_STRING_data(ASN1_STRING *x))
^
/builds/SoftEther/SoftEtherVPN/src/Mayaqua/Encrypt.c: In function 'FreeOpenSSLThreadState':
/builds/SoftEther/SoftEtherVPN/src/Mayaqua/Encrypt.c:3643:2: warning: 'ERR_remove_state' is deprecated [-Wdeprecated-declarations]
ERR_remove_state(0);
^~~~~~~~~~~~~~~~
In file included from /usr/include/openssl/ct.h:13:0,
from /usr/include/openssl/ssl.h:61,
from /builds/SoftEther/SoftEtherVPN/src/Mayaqua/Encrypt.c:127:
/usr/include/openssl/err.h:248:1: note: declared here
DEPRECATEDIN_1_0_0(void ERR_remove_state(unsigned long pid))
^
/builds/SoftEther/SoftEtherVPN/src/Cedar/Console.c: In function 'PasswordPrompt':
/builds/SoftEther/SoftEtherVPN/src/Cedar/Console.c:2051:8: warning: implicit declaration of function 'getch'; did you mean 'getc'? [-Wimplicit-function-declaration]
c = getch();
^~~~~
getc
In file included from /builds/SoftEther/SoftEtherVPN/src/Cedar/Bridge.c:130:0:
/builds/SoftEther/SoftEtherVPN/src/Cedar/BridgeUnix.c: In function 'CloseEth':
/builds/SoftEther/SoftEtherVPN/src/Cedar/BridgeUnix.c:1568:3: warning: implicit declaration of function 'FreeTap'; did you mean 'FreeCaps'? [-Wimplicit-function-declaration]
FreeTap(e->Tap);
^~~~~~~
FreeCaps
