1 files changed, 103 insertions, 0 deletions
diff --git a/src/bun.js/bindings/webcrypto/CryptoAlgorithmECDSAOpenSSL.cpp b/src/bun.js/bindings/webcrypto/CryptoAlgorithmECDSAOpenSSL.cpp
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+++ b/src/bun.js/bindings/webcrypto/CryptoAlgorithmECDSAOpenSSL.cpp
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2020 Sony Interactive Entertainment Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "CryptoAlgorithmECDSA.h"
+
+#if ENABLE(WEB_CRYPTO)
+
+#include "CryptoAlgorithmEcdsaParams.h"
+#include "CryptoKeyEC.h"
+#include "OpenSSLUtilities.h"
+
+namespace WebCore {
+
+ExceptionOr<Vector<uint8_t>> CryptoAlgorithmECDSA::platformSign(const CryptoAlgorithmEcdsaParams& parameters, const CryptoKeyEC& key, const Vector<uint8_t>& data)
+{
+    size_t keySizeInBytes = (key.keySizeInBits() + 7) / 8;
+
+    const EVP_MD* md = digestAlgorithm(parameters.hashIdentifier);
+    if (!md)
+        return Exception { NotSupportedError };
+
+    std::optional<Vector<uint8_t>> digest = calculateDigest(md, data);
+    if (!digest)
+        return Exception { OperationError };
+
+    EC_KEY* ecKey = EVP_PKEY_get0_EC_KEY(key.platformKey());
+    if (!ecKey)
+        return Exception { OperationError };
+
+    // We use ECDSA_do_sign rather than EVP API because the latter handles ECDSA signature in DER format
+    // while this function is supposed to return simply concatinated "r" and "s".
+    auto sig = ECDSASigPtr(ECDSA_do_sign(digest->data(), digest->size(), ecKey));
+    if (!sig)
+        return Exception { OperationError };
+
+    const BIGNUM* r;
+    const BIGNUM* s;
+    ECDSA_SIG_get0(sig.get(), &r, &s);
+
+    // Concatenate r and s, expanding r and s to keySizeInBytes.
+    Vector<uint8_t> signature = convertToBytesExpand(r, keySizeInBytes);
+    signature.appendVector(convertToBytesExpand(s, keySizeInBytes));
+
+    return signature;
+}
+
+ExceptionOr<bool> CryptoAlgorithmECDSA::platformVerify(const CryptoAlgorithmEcdsaParams& parameters, const CryptoKeyEC& key, const Vector<uint8_t>& signature, const Vector<uint8_t>& data)
+{
+    size_t keySizeInBytes = (key.keySizeInBits() + 7) / 8;
+
+    // Bail if the signature size isn't double the key size (i.e. concatenated r and s components).
+    if (signature.size() != keySizeInBytes * 2)
+        return false;
+    
+    auto sig = ECDSASigPtr(ECDSA_SIG_new());
+    auto r = BN_bin2bn(signature.data(), keySizeInBytes, nullptr);
+    auto s = BN_bin2bn(signature.data() + keySizeInBytes, keySizeInBytes, nullptr);
+
+    if (!ECDSA_SIG_set0(sig.get(), r, s))
+        return Exception { OperationError };
+
+    const EVP_MD* md = digestAlgorithm(parameters.hashIdentifier);
+    if (!md)
+        return Exception { NotSupportedError };
+
+    std::optional<Vector<uint8_t>> digest = calculateDigest(md, data);
+    if (!digest)
+        return Exception { OperationError };
+
+    EC_KEY* ecKey = EVP_PKEY_get0_EC_KEY(key.platformKey());
+    if (!ecKey)
+        return Exception { OperationError };
+
+    int ret = ECDSA_do_verify(digest->data(), digest->size(), sig.get(), ecKey);
+    return ret == 1;
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(WEB_CRYPTO)