[webcrypto] Implement RSA-OAEP using BoringSSL.

crypto/scoped_openssl_types.h

 // 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_SCOPED_OPENSSL_TYPES_H_
 #define CRYPTO_SCOPED_OPENSSL_TYPES_H_
 
 #include <openssl/bio.h>
 #include <openssl/bn.h>
 #include <openssl/dsa.h>
@@ skipping 13 matching lines @@
 struct OpenSSLDestroyer {
   void operator()(Type* ptr) const { Destroyer(ptr); }
 };
 
 template <typename PointerType, void (*Destroyer)(PointerType*)>
 struct ScopedOpenSSL {
   typedef scoped_ptr<PointerType, OpenSSLDestroyer<PointerType, Destroyer> >
       Type;
 };
 
+struct OpenSSLFree {
+  void operator()(uint8_t* ptr) const { OPENSSL_free(ptr); }
+};
+
 // Several typedefs are provided for crypto-specific primitives, for
 // short-hand and prevalence. Note that OpenSSL types related to X.509 are
 // intentionally not included, as crypto/ does not generally deal with
 // certificates or PKI.
 typedef ScopedOpenSSL<BIGNUM, BN_free>::Type ScopedBIGNUM;
 typedef ScopedOpenSSL<EC_KEY, EC_KEY_free>::Type ScopedEC_KEY;
 typedef ScopedOpenSSL<BIO, BIO_free_all>::Type ScopedBIO;
 typedef ScopedOpenSSL<DSA, DSA_free>::Type ScopedDSA;
 typedef ScopedOpenSSL<ECDSA_SIG, ECDSA_SIG_free>::Type ScopedECDSA_SIG;
 typedef ScopedOpenSSL<EC_KEY, EC_KEY_free>::Type ScopedEC_KEY;
 typedef ScopedOpenSSL<EVP_MD_CTX, EVP_MD_CTX_destroy>::Type ScopedEVP_MD_CTX;
 typedef ScopedOpenSSL<EVP_PKEY, EVP_PKEY_free>::Type ScopedEVP_PKEY;
+typedef ScopedOpenSSL<EVP_PKEY_CTX, EVP_PKEY_CTX_free>::Type ScopedEVP_PKEY_CTX;
 typedef ScopedOpenSSL<RSA, RSA_free>::Type ScopedRSA;
 
+// The bytes must have been allocated with OPENSSL_malloc.
+typedef scoped_ptr<uint8_t, OpenSSLFree> ScopedOpenSSLBytes;
+
 }  // namespace crypto
 
 #endif  // CRYPTO_SCOPED_OPENSSL_TYPES_H_