third_party/openssl: add ChaCha20+Poly1305 support.

openssl/crypto/evp/evp_locl.h

Index: openssl/crypto/evp/evp_locl.h
diff --git a/openssl/crypto/evp/evp_locl.h b/openssl/crypto/evp/evp_locl.h
index 08c0a66d39c79c60107f0315d463841aeb59d1cc..c0f9fdf50b72089d6cb40b0d4acde26ab6d4eaf1 100644
--- a/openssl/crypto/evp/evp_locl.h
+++ b/openssl/crypto/evp/evp_locl.h
@@ -348,6 +348,30 @@ int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
 			     ASN1_TYPE *param,
 			     const EVP_CIPHER *c, const EVP_MD *md, int en_de);
 
+/* EVP_AEAD represents a specific AEAD algorithm. */
+struct evp_aead_st {
+	unsigned char key_len;
+	unsigned char nonce_len;
+	unsigned char overhead;
+	unsigned char max_tag_len;
+
+	int (*init) (struct evp_aead_ctx_st*, const unsigned char *key,
+		     size_t key_len, size_t tag_len);
+	void (*cleanup) (struct evp_aead_ctx_st*);
+
+	ssize_t (*seal) (const struct evp_aead_ctx_st *ctx,
+			 unsigned char *out, size_t max_out_len,
+			 const unsigned char *nonce, size_t nonce_len,
+			 const unsigned char *in, size_t in_len,
+			 const unsigned char *ad, size_t ad_len);
+
+	ssize_t (*open) (const struct evp_aead_ctx_st *ctx,
+			 unsigned char *out, size_t max_out_len,
+			 const unsigned char *nonce, size_t nonce_len,
+			 const unsigned char *in, size_t in_len,
+			 const unsigned char *ad, size_t ad_len);
+};
+
 #ifdef OPENSSL_FIPS
 
 #ifdef OPENSSL_DOING_MAKEDEPEND