Opaquify SSL_CIPHER.

Bug: 6
Change-Id: Ieb2a8816b63425dce64e26ac41ded894a6c5e61b
Reviewed-on: https://boringssl-review.googlesource.com/20264
Commit-Queue: David Benjamin <davidben@google.com>
Commit-Queue: Steven Valdez <svaldez@google.com>
Reviewed-by: Steven Valdez <svaldez@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>

ssl/internal.h

diff --git a/ssl/internal.h b/ssl/internal.h
index 2fb3614..9e67457 100644
--- a/ssl/internal.h
+++ b/ssl/internal.h
@@ -302,6 +302,26 @@
 
 // Cipher suites.
 
+}  // namespace bssl
+
+struct ssl_cipher_st {
+  // name is the OpenSSL name for the cipher.
+  const char *name;
+  // standard_name is the IETF name for the cipher.
+  const char *standard_name;
+  // id is the cipher suite value bitwise OR-d with 0x03000000.
+  uint32_t id;
+
+  // algorithm_* determine the cipher suite. See constants below for the values.
+  uint32_t algorithm_mkey;
+  uint32_t algorithm_auth;
+  uint32_t algorithm_enc;
+  uint32_t algorithm_mac;
+  uint32_t algorithm_prf;
+};
+
+namespace bssl {
+
 // Bits for |algorithm_mkey| (key exchange algorithm).
 #define SSL_kRSA 0x00000001u
 #define SSL_kECDHE 0x00000002u