7e7e76afca
This is a major update to the current LTS version, supported until 2026-09-07. Changelog: https://github.com/openssl/openssl/blob/openssl-3.0.8/CHANGES.md Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>
93 lines
3.8 KiB
Diff
93 lines
3.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Eneas U de Queiroz <cote2004-github@yahoo.com>
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Date: Thu, 27 Sep 2018 08:44:39 -0300
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Subject: Add OPENSSL_PREFER_CHACHA_OVER_GCM option
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This enables a compile-time option to prefer ChaCha20-Poly1305 over
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AES-GCM in the openssl default ciphersuite, which is useful in systems
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without AES specific CPU instructions.
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OPENSSL_PREFER_CHACHA_OVER_GCM must be defined to enable it.
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Note that this does not have the same effect as the
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SL_OP_PRIORITIZE_CHACHA option, which prioritizes ChaCha20-Poly1305 only
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when the client has it on top of its ciphersuite preference.
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Signed-off-by: Eneas U de Queiroz <cote2004-github@yahoo.com>
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--- a/ssl/ssl_ciph.c
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+++ b/ssl/ssl_ciph.c
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@@ -1505,11 +1505,29 @@ STACK_OF(SSL_CIPHER) *ssl_create_cipher_
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ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head,
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&tail);
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+ /*
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+ * If OPENSSL_PREFER_CHACHA_OVER_GCM is defined, ChaCha20_Poly1305
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+ * will be placed before AES-256. Otherwise, the default behavior of
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+ * preferring GCM over CHACHA is used.
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+ * This is useful for systems that do not have AES-specific CPU
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+ * instructions, where ChaCha20-Poly1305 is 3 times faster than AES.
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+ * Note that this does not have the same effect as the SSL_OP_PRIORITIZE_CHACHA
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+ * option, which prioritizes ChaCha20-Poly1305 only when the client has it on top
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+ * of its ciphersuite preference.
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+ */
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+
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+#ifdef OPENSSL_PREFER_CHACHA_OVER_GCM
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+ ssl_cipher_apply_rule(0, 0, 0, SSL_CHACHA20, 0, 0, 0, CIPHER_ADD, -1,
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+ &head, &tail);
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+ ssl_cipher_apply_rule(0, 0, 0, SSL_AESGCM, 0, 0, 0, CIPHER_ADD, -1,
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+ &head, &tail);
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+#else
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/* Within each strength group, we prefer GCM over CHACHA... */
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ssl_cipher_apply_rule(0, 0, 0, SSL_AESGCM, 0, 0, 0, CIPHER_ADD, -1,
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&head, &tail);
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ssl_cipher_apply_rule(0, 0, 0, SSL_CHACHA20, 0, 0, 0, CIPHER_ADD, -1,
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&head, &tail);
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+#endif
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/*
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* ...and generally, our preferred cipher is AES.
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@@ -1564,7 +1582,7 @@ STACK_OF(SSL_CIPHER) *ssl_create_cipher_
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* Within each group, ciphers remain sorted by strength and previous
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* preference, i.e.,
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* 1) ECDHE > DHE
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- * 2) GCM > CHACHA
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+ * 2) GCM > CHACHA, reversed if OPENSSL_PREFER_CHACHA_OVER_GCM is defined
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* 3) AES > rest
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* 4) TLS 1.2 > legacy
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*
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@@ -2235,7 +2253,13 @@ const char *OSSL_default_cipher_list(voi
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*/
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const char *OSSL_default_ciphersuites(void)
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{
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+#ifdef OPENSSL_PREFER_CHACHA_OVER_GCM
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+ return "TLS_CHACHA20_POLY1305_SHA256:"
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+ "TLS_AES_256_GCM_SHA384:"
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+ "TLS_AES_128_GCM_SHA256";
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+#else
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return "TLS_AES_256_GCM_SHA384:"
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"TLS_CHACHA20_POLY1305_SHA256:"
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"TLS_AES_128_GCM_SHA256";
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+#endif
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}
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--- a/include/openssl/ssl.h.in
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+++ b/include/openssl/ssl.h.in
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@@ -195,9 +195,15 @@ extern "C" {
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* DEPRECATED IN 3.0.0, in favor of OSSL_default_ciphersuites()
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* Update both macro and function simultaneously
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*/
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-# define TLS_DEFAULT_CIPHERSUITES "TLS_AES_256_GCM_SHA384:" \
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- "TLS_CHACHA20_POLY1305_SHA256:" \
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- "TLS_AES_128_GCM_SHA256"
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+# ifdef OPENSSL_PREFER_CHACHA_OVER_GCM
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+# define TLS_DEFAULT_CIPHERSUITES "TLS_CHACHA20_POLY1305_SHA256:" \
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+ "TLS_AES_256_GCM_SHA384:" \
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+ "TLS_AES_128_GCM_SHA256"
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+# else
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+# define TLS_DEFAULT_CIPHERSUITES "TLS_AES_256_GCM_SHA384:" \
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+ "TLS_CHACHA20_POLY1305_SHA256:" \
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+ "TLS_AES_128_GCM_SHA256"
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+# endif
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# endif
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/*
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* As of OpenSSL 1.0.0, ssl_create_cipher_list() in ssl/ssl_ciph.c always
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