html_viewer: Move webcrypto to a place where html_viewer can use it.

content/child/webcrypto/openssl/ecdsa_openssl.cc

Index: content/child/webcrypto/openssl/ecdsa_openssl.cc
diff --git a/content/child/webcrypto/openssl/ecdsa_openssl.cc b/content/child/webcrypto/openssl/ecdsa_openssl.cc
deleted file mode 100644
index 49585ee09494a8162121e2106c9d4c12b8fc0a6b..0000000000000000000000000000000000000000
--- a/content/child/webcrypto/openssl/ecdsa_openssl.cc
+++ /dev/null
@@ -1,270 +0,0 @@
-// 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.
-
-#include <openssl/ec.h>
-#include <openssl/ec_key.h>
-#include <openssl/evp.h>
-
-#include "base/logging.h"
-#include "base/stl_util.h"
-#include "content/child/webcrypto/algorithm_implementation.h"
-#include "content/child/webcrypto/crypto_data.h"
-#include "content/child/webcrypto/generate_key_result.h"
-#include "content/child/webcrypto/openssl/ec_algorithm_openssl.h"
-#include "content/child/webcrypto/openssl/key_openssl.h"
-#include "content/child/webcrypto/openssl/util_openssl.h"
-#include "content/child/webcrypto/status.h"
-#include "content/child/webcrypto/webcrypto_util.h"
-#include "crypto/openssl_util.h"
-#include "crypto/scoped_openssl_types.h"
-#include "crypto/secure_util.h"
-#include "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h"
-#include "third_party/WebKit/public/platform/WebCryptoKey.h"
-#include "third_party/WebKit/public/platform/WebCryptoKeyAlgorithm.h"
-
-namespace content {
-
-namespace webcrypto {
-
-namespace {
-
-// Extracts the OpenSSL key and digest from a WebCrypto key + algorithm. The
-// returned pkey pointer will remain valid as long as |key| is alive.
-Status GetPKeyAndDigest(const blink::WebCryptoAlgorithm& algorithm,
-                        const blink::WebCryptoKey& key,
-                        EVP_PKEY** pkey,
-                        const EVP_MD** digest) {
-  *pkey = AsymKeyOpenSsl::Cast(key)->key();
-  *digest = GetDigest(algorithm.ecdsaParams()->hash().id());
-  if (!*digest)
-    return Status::ErrorUnsupported();
-  return Status::Success();
-}
-
-// Gets the EC key's order size in bytes.
-Status GetEcGroupOrderSize(EVP_PKEY* pkey, size_t* order_size_bytes) {
-  crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
-
-  crypto::ScopedEC_KEY ec(EVP_PKEY_get1_EC_KEY(pkey));
-  if (!ec.get())
-    return Status::ErrorUnexpected();
-
-  const EC_GROUP* group = EC_KEY_get0_group(ec.get());
-
-  crypto::ScopedBIGNUM order(BN_new());
-  if (!EC_GROUP_get_order(group, order.get(), NULL))
-    return Status::OperationError();
-
-  *order_size_bytes = BN_num_bytes(order.get());
-  return Status::Success();
-}
-
-// Formats a DER-encoded signature (ECDSA-Sig-Value as specified in RFC 3279) to
-// the signature format expected by WebCrypto (raw concatenated "r" and "s").
-//
-// TODO(eroman): Where is the specification for WebCrypto's signature format?
-Status ConvertDerSignatureToWebCryptoSignature(
-    EVP_PKEY* key,
-    std::vector<uint8_t>* signature) {
-  crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
-
-  const unsigned char* der_data = vector_as_array(signature);
-  crypto::ScopedECDSA_SIG ecdsa_sig(
-      d2i_ECDSA_SIG(NULL, &der_data, static_cast<long>(signature->size())));
-  if (!ecdsa_sig.get())
-    return Status::ErrorUnexpected();
-
-  // |der_data| is updated to point to past the end of the DER structure.
-  if (der_data != vector_as_array(signature) + signature->size())
-    return Status::ErrorUnexpected();
-
-  // Determine the maximum length of r and s.
-  size_t order_size_bytes;
-  Status status = GetEcGroupOrderSize(key, &order_size_bytes);
-  if (status.IsError())
-    return status;
-
-  signature->resize(order_size_bytes * 2);
-
-  if (!BN_bn2bin_padded(vector_as_array(signature), order_size_bytes,
-                        ecdsa_sig.get()->r)) {
-    return Status::ErrorUnexpected();
-  }
-
-  if (!BN_bn2bin_padded(&(*signature)[order_size_bytes], order_size_bytes,
-                        ecdsa_sig.get()->s)) {
-    return Status::ErrorUnexpected();
-  }
-
-  return Status::Success();
-}
-
-// Formats a WebCrypto ECDSA signature to a DER-encoded signature
-// (ECDSA-Sig-Value as specified in RFC 3279).
-//
-// TODO(eroman): What is the specification for WebCrypto's signature format?
-//
-// If the signature length is incorrect (not 2 * order_size), then
-// Status::Success() is returned and |*incorrect_length| is set to true;
-//
-// Otherwise on success, der_signature is filled with a ASN.1 encoded
-// ECDSA-Sig-Value.
-Status ConvertWebCryptoSignatureToDerSignature(
-    EVP_PKEY* key,
-    const CryptoData& signature,
-    std::vector<uint8_t>* der_signature,
-    bool* incorrect_length) {
-  crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
-
-  // Determine the length of r and s.
-  size_t order_size_bytes;
-  Status status = GetEcGroupOrderSize(key, &order_size_bytes);
-  if (status.IsError())
-    return status;
-
-  // If the size of the signature is incorrect, verification must fail. Success
-  // is returned here rather than an error, so that the caller can fail
-  // verification with a boolean, rather than reject the promise with an
-  // exception.
-  if (signature.byte_length() != 2 * order_size_bytes) {
-    *incorrect_length = true;
-    return Status::Success();
-  }
-
-  *incorrect_length = false;
-
-  // Construct an ECDSA_SIG from |signature|.
-  crypto::ScopedECDSA_SIG ecdsa_sig(ECDSA_SIG_new());
-  if (!ecdsa_sig)
-    return Status::OperationError();
-
-  if (!BN_bin2bn(signature.bytes(), order_size_bytes, ecdsa_sig->r) ||
-      !BN_bin2bn(signature.bytes() + order_size_bytes, order_size_bytes,
-                 ecdsa_sig->s)) {
-    return Status::ErrorUnexpected();
-  }
-
-  // Determine the size of the DER-encoded signature.
-  int der_encoding_size = i2d_ECDSA_SIG(ecdsa_sig.get(), NULL);
-  if (der_encoding_size < 0)
-    return Status::OperationError();
-
-  // DER-encode the signature.
-  der_signature->resize(der_encoding_size);
-  uint8_t* result = vector_as_array(der_signature);
-  if (0 > i2d_ECDSA_SIG(ecdsa_sig.get(), &result))
-    return Status::OperationError();
-
-  return Status::Success();
-}
-
-class EcdsaImplementation : public EcAlgorithm {
- public:
-  EcdsaImplementation()
-      : EcAlgorithm(blink::WebCryptoKeyUsageVerify,
-                    blink::WebCryptoKeyUsageSign) {}
-
-  const char* GetJwkAlgorithm(
-      const blink::WebCryptoNamedCurve curve) const override {
-    switch (curve) {
-      case blink::WebCryptoNamedCurveP256:
-        return "ES256";
-      case blink::WebCryptoNamedCurveP384:
-        return "ES384";
-      case blink::WebCryptoNamedCurveP521:
-        // This is not a typo! ES512 means P-521 with SHA-512.
-        return "ES512";
-      default:
-        return NULL;
-    }
-  }
-
-  Status Sign(const blink::WebCryptoAlgorithm& algorithm,
-              const blink::WebCryptoKey& key,
-              const CryptoData& data,
-              std::vector<uint8_t>* buffer) const override {
-    if (key.type() != blink::WebCryptoKeyTypePrivate)
-      return Status::ErrorUnexpectedKeyType();
-
-    crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
-    crypto::ScopedEVP_MD_CTX ctx(EVP_MD_CTX_create());
-
-    EVP_PKEY* private_key = NULL;
-    const EVP_MD* digest = NULL;
-    Status status = GetPKeyAndDigest(algorithm, key, &private_key, &digest);
-    if (status.IsError())
-      return status;
-
-    // NOTE: A call to EVP_DigestSignFinal() with a NULL second parameter
-    // returns a maximum allocation size, while the call without a NULL returns
-    // the real one, which may be smaller.
-    size_t sig_len = 0;
-    if (!ctx.get() ||
-        !EVP_DigestSignInit(ctx.get(), NULL, digest, NULL, private_key) ||
-        !EVP_DigestSignUpdate(ctx.get(), data.bytes(), data.byte_length()) ||
-        !EVP_DigestSignFinal(ctx.get(), NULL, &sig_len)) {
-      return Status::OperationError();
-    }
-
-    buffer->resize(sig_len);
-    if (!EVP_DigestSignFinal(ctx.get(), vector_as_array(buffer), &sig_len))
-      return Status::OperationError();
-    buffer->resize(sig_len);
-
-    // ECDSA signing in BoringSSL outputs a DER-encoded (r,s). WebCrypto however
-    // expects a padded bitstring that is r concatenated to s. Convert to the
-    // expected format.
-    return ConvertDerSignatureToWebCryptoSignature(private_key, buffer);
-  }
-
-  Status Verify(const blink::WebCryptoAlgorithm& algorithm,
-                const blink::WebCryptoKey& key,
-                const CryptoData& signature,
-                const CryptoData& data,
-                bool* signature_match) const override {
-    if (key.type() != blink::WebCryptoKeyTypePublic)
-      return Status::ErrorUnexpectedKeyType();
-
-    crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
-    crypto::ScopedEVP_MD_CTX ctx(EVP_MD_CTX_create());
-
-    EVP_PKEY* public_key = NULL;
-    const EVP_MD* digest = NULL;
-    Status status = GetPKeyAndDigest(algorithm, key, &public_key, &digest);
-    if (status.IsError())
-      return status;
-
-    std::vector<uint8_t> der_signature;
-    bool incorrect_length_signature = false;
-    status = ConvertWebCryptoSignatureToDerSignature(
-        public_key, signature, &der_signature, &incorrect_length_signature);
-    if (status.IsError())
-      return status;
-
-    if (incorrect_length_signature) {
-      *signature_match = false;
-      return Status::Success();
-    }
-
-    if (!EVP_DigestVerifyInit(ctx.get(), NULL, digest, NULL, public_key) ||
-        !EVP_DigestVerifyUpdate(ctx.get(), data.bytes(), data.byte_length())) {
-      return Status::OperationError();
-    }
-
-    *signature_match =
-        1 == EVP_DigestVerifyFinal(ctx.get(), vector_as_array(&der_signature),
-                                   der_signature.size());
-    return Status::Success();
-  }
-};
-
-}  // namespace
-
-AlgorithmImplementation* CreatePlatformEcdsaImplementation() {
-  return new EcdsaImplementation;
-}
-
-}  // namespace webcrypto
-
-}  // namespace content