1 files changed, 56 insertions, 0 deletions
diff --git a/src/tls.cc b/src/tls.cc
index e88dc56..9babf2a 100644
--- a/src/tls.cc
+++ b/src/tls.cc
@@ -32,6 +32,11 @@
 #include <openssl/crypto.h>
 #include <openssl/conf.h>
 
+#ifdef HAVE_LIBBROTLI
+#  include <brotli/encode.h>
+#  include <brotli/decode.h>
+#endif // HAVE_LIBBROTLI
+
 #include "ssl_compat.h"
 
 namespace nghttp2 {
@@ -120,6 +125,57 @@ int ssl_ctx_set_proto_versions(SSL_CTX *ssl_ctx, int min, int max) {
   return 0;
 }
 
+#if defined(NGHTTP2_OPENSSL_IS_BORINGSSL) && defined(HAVE_LIBBROTLI)
+int cert_compress(SSL *ssl, CBB *out, const uint8_t *in, size_t in_len) {
+  uint8_t *dest;
+
+  auto compressed_size = BrotliEncoderMaxCompressedSize(in_len);
+  if (compressed_size == 0) {
+    return 0;
+  }
+
+  if (!CBB_reserve(out, &dest, compressed_size)) {
+    return 0;
+  }
+
+  if (BrotliEncoderCompress(BROTLI_MAX_QUALITY, BROTLI_DEFAULT_WINDOW,
+                            BROTLI_MODE_GENERIC, in_len, in, &compressed_size,
+                            dest) != BROTLI_TRUE) {
+    return 0;
+  }
+
+  if (!CBB_did_write(out, compressed_size)) {
+    return 0;
+  }
+
+  return 1;
+}
+
+int cert_decompress(SSL *ssl, CRYPTO_BUFFER **out, size_t uncompressed_len,
+                    const uint8_t *in, size_t in_len) {
+  uint8_t *dest;
+  auto buf = CRYPTO_BUFFER_alloc(&dest, uncompressed_len);
+  auto len = uncompressed_len;
+
+  if (BrotliDecoderDecompress(in_len, in, &len, dest) !=
+      BROTLI_DECODER_RESULT_SUCCESS) {
+    CRYPTO_BUFFER_free(buf);
+
+    return 0;
+  }
+
+  if (uncompressed_len != len) {
+    CRYPTO_BUFFER_free(buf);
+
+    return 0;
+  }
+
+  *out = buf;
+
+  return 1;
+}
+#endif // NGHTTP2_OPENSSL_IS_BORINGSSL && HAVE_LIBBROTLI
+
 } // namespace tls
 
 } // namespace nghttp2