Add OpenSSL BIO method that writes to a std::string.

crypto/openssl_bio_string.h

Index: crypto/openssl_bio_string.h
diff --git a/crypto/openssl_bio_string.h b/crypto/openssl_bio_string.h
new file mode 100644
index 0000000000000000000000000000000000000000..a53e1db8ea3f3ed20f1a415cd9156b6a12efd6d0
--- /dev/null
+++ b/crypto/openssl_bio_string.h
@@ -0,0 +1,21 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CRYPTO_OPENSSL_BIO_STRING_H_
+#define CRYPTO_OPENSSL_BIO_STRING_H_
+
+#include <string>
+
+#include "crypto/crypto_export.h"
+
+typedef struct bio_st BIO;

[Ryan Sleevi, 2014/05/19 23:25:44]

// From <openssl/bio.h>

[mattm, 2014/05/20 00:22:24]

Done.

+
+namespace crypto {
+
+BIO* CRYPTO_EXPORT BIO_new_string(std::string* out);

[Ryan Sleevi, 2014/05/19 23:25:44]

Document

// Creates a new BIO that can be used with OpenSSL's
// various output functions, and which will write all output
// directly into |out|. This is primarily intended as a
// utility to reduce the amount of copying and separate
// allocations when performing extensive string modifications
// or streaming within OpenSSL.
//
// Note: |out| must remain valid for the duration of the BIO.

[mattm, 2014/05/20 00:22:24]

Thanks, done.

+
+}  // namespace crypto
+
+#endif  // CRYPTO_OPENSSL_BIO_STRING_H_
+