Expose WebCrypto's lookupAlgorithmInfo.

Will allow reuse of this function in the implementation of the enterprise.platfromKeys Chrome extension API.

BUG=364435

Review URL: https://codereview.chromium.org/312393004

git-svn-id: svn://svn.chromium.org/blink/trunk@176190 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/modules/crypto/KeyAlgorithm.cpp

@@ -36,6 +36,7 @@
 #include "modules/crypto/NormalizeAlgorithm.h"
 #include "modules/crypto/RsaHashedKeyAlgorithm.h"
 #include "modules/crypto/RsaKeyAlgorithm.h"
+#include "public/platform/WebCryptoAlgorithm.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
@@ -75,7 +76,8 @@ KeyAlgorithm::KeyAlgorithm(const blink::WebCryptoKeyAlgorithm& algorithm)
 
 String KeyAlgorithm::name()
 {
-    return algorithmIdToName(m_algorithm.id());
+    const blink::WebCryptoAlgorithmInfo* info = blink::WebCryptoAlgorithm::lookupAlgorithmInfo(m_algorithm.id());
+    return info->name;
 }
 
 bool KeyAlgorithm::isAesKeyAlgorithm() const

third_party/WebKit/Source/modules/crypto/NormalizeAlgorithm.cpp

@@ -75,194 +75,6 @@ const AlgorithmNameMapping algorithmNameMappings[] = {
     {"RSASSA-PKCS1-V1_5", 17, blink::WebCryptoAlgorithmIdRsaSsaPkcs1v1_5},
 };
 
-typedef char ParamsTypeOrUndefined;
-const ParamsTypeOrUndefined Undefined = -1;
-
-struct AlgorithmInfo {
-    // The canonical (case-sensitive) name for the algorithm.
-    const char* name;
-
-    // A map from the operation to the expected parameter type of the algorithm.
-    // If an operation is not applicable for the algorithm, set to Undefined.
-    const ParamsTypeOrUndefined operationToParamsType[blink::WebCryptoOperationLast + 1];
-};
-
-// A mapping from the algorithm ID to information about the algorithm.
-const AlgorithmInfo algorithmIdToInfo[] = {
-    { // Index 0
-        "AES-CBC", {
-            blink::WebCryptoAlgorithmParamsTypeAesCbcParams, // Encrypt
-            blink::WebCryptoAlgorithmParamsTypeAesCbcParams, // Decrypt
-            Undefined, // Sign
-            Undefined, // Verify
-            Undefined, // Digest
-            blink::WebCryptoAlgorithmParamsTypeAesKeyGenParams, // GenerateKey
-            blink::WebCryptoAlgorithmParamsTypeNone, // ImportKey
-            Undefined, // DeriveKey
-            Undefined, // DeriveBits
-            blink::WebCryptoAlgorithmParamsTypeAesCbcParams, // WrapKey
-            blink::WebCryptoAlgorithmParamsTypeAesCbcParams // UnwrapKey
-        }
-    }, { // Index 1
-        "HMAC", {
-            Undefined, // Encrypt
-            Undefined, // Decrypt
-            blink::WebCryptoAlgorithmParamsTypeNone, // Sign
-            blink::WebCryptoAlgorithmParamsTypeNone, // Verify
-            Undefined, // Digest
-            blink::WebCryptoAlgorithmParamsTypeHmacKeyGenParams, // GenerateKey
-            blink::WebCryptoAlgorithmParamsTypeHmacImportParams, // ImportKey
-            Undefined, // DeriveKey
-            Undefined, // DeriveBits
-            Undefined, // WrapKey
-            Undefined // UnwrapKey
-        }
-    }, { // Index 2
-        "RSASSA-PKCS1-v1_5", {
-            Undefined, // Encrypt
-            Undefined, // Decrypt
-            blink::WebCryptoAlgorithmParamsTypeNone, // Sign
-            blink::WebCryptoAlgorithmParamsTypeNone, // Verify
-            Undefined, // Digest
-            blink::WebCryptoAlgorithmParamsTypeRsaHashedKeyGenParams, // GenerateKey
-            blink::WebCryptoAlgorithmParamsTypeRsaHashedImportParams, // ImportKey
-            Undefined, // DeriveKey
-            Undefined, // DeriveBits
-            Undefined, // WrapKey
-            Undefined // UnwrapKey
-        }
-    }, { // Index 3
-        "SHA-1", {
-            Undefined, // Encrypt
-            Undefined, // Decrypt
-            Undefined, // Sign
-            Undefined, // Verify
-            blink::WebCryptoAlgorithmParamsTypeNone, // Digest
-            Undefined, // GenerateKey
-            Undefined, // ImportKey
-            Undefined, // DeriveKey
-            Undefined, // DeriveBits
-            Undefined, // WrapKey
-            Undefined // UnwrapKey
-        }
-    }, { // Index 4
-        "SHA-256", {
-            Undefined, // Encrypt
-            Undefined, // Decrypt
-            Undefined, // Sign
-            Undefined, // Verify
-            blink::WebCryptoAlgorithmParamsTypeNone, // Digest
-            Undefined, // GenerateKey
-            Undefined, // ImportKey
-            Undefined, // DeriveKey
-            Undefined, // DeriveBits
-            Undefined, // WrapKey
-            Undefined // UnwrapKey
-        }
-    }, { // Index 5
-        "SHA-384", {
-            Undefined, // Encrypt
-            Undefined, // Decrypt
-            Undefined, // Sign
-            Undefined, // Verify
-            blink::WebCryptoAlgorithmParamsTypeNone, // Digest
-            Undefined, // GenerateKey
-            Undefined, // ImportKey
-            Undefined, // DeriveKey
-            Undefined, // DeriveBits
-            Undefined, // WrapKey
-            Undefined // UnwrapKey
-        }
-    }, { // Index 6
-        "SHA-512", {
-            Undefined, // Encrypt
-            Undefined, // Decrypt
-            Undefined, // Sign
-            Undefined, // Verify
-            blink::WebCryptoAlgorithmParamsTypeNone, // Digest
-            Undefined, // GenerateKey
-            Undefined, // ImportKey
-            Undefined, // DeriveKey
-            Undefined, // DeriveBits
-            Undefined, // WrapKey
-            Undefined // UnwrapKey
-        }
-    }, { // Index 7
-        "AES-GCM", {
-            blink::WebCryptoAlgorithmParamsTypeAesGcmParams, // Encrypt
-            blink::WebCryptoAlgorithmParamsTypeAesGcmParams, // Decrypt
-            Undefined, // Sign
-            Undefined, // Verify
-            Undefined, // Digest
-            blink::WebCryptoAlgorithmParamsTypeAesKeyGenParams, // GenerateKey
-            blink::WebCryptoAlgorithmParamsTypeNone, // ImportKey
-            Undefined, // DeriveKey
-            Undefined, // DeriveBits
-            blink::WebCryptoAlgorithmParamsTypeAesGcmParams, // WrapKey
-            blink::WebCryptoAlgorithmParamsTypeAesGcmParams // UnwrapKey
-        }
-    }, { // Index 8
-        "RSA-OAEP", {
-            blink::WebCryptoAlgorithmParamsTypeRsaOaepParams, // Encrypt
-            blink::WebCryptoAlgorithmParamsTypeRsaOaepParams, // Decrypt
-            Undefined, // Sign
-            Undefined, // Verify
-            Undefined, // Digest
-            blink::WebCryptoAlgorithmParamsTypeRsaHashedKeyGenParams, // GenerateKey
-            blink::WebCryptoAlgorithmParamsTypeRsaHashedImportParams, // ImportKey
-            Undefined, // DeriveKey
-            Undefined, // DeriveBits
-            blink::WebCryptoAlgorithmParamsTypeRsaOaepParams, // WrapKey
-            blink::WebCryptoAlgorithmParamsTypeRsaOaepParams // UnwrapKey
-        }
-    }, { // Index 9
-        "AES-CTR", {
-            blink::WebCryptoAlgorithmParamsTypeAesCtrParams, // Encrypt
-            blink::WebCryptoAlgorithmParamsTypeAesCtrParams, // Decrypt
-            Undefined, // Sign
-            Undefined, // Verify
-            Undefined, // Digest
-            blink::WebCryptoAlgorithmParamsTypeAesKeyGenParams, // GenerateKey
-            blink::WebCryptoAlgorithmParamsTypeNone, // ImportKey
-            Undefined, // DeriveKey
-            Undefined, // DeriveBits
-            blink::WebCryptoAlgorithmParamsTypeAesCtrParams, // WrapKey
-            blink::WebCryptoAlgorithmParamsTypeAesCtrParams // UnwrapKey
-        }
-    }, { // Index 10
-        "AES-KW", {
-            Undefined, // Encrypt
-            Undefined, // Decrypt
-            Undefined, // Sign
-            Undefined, // Verify
-            Undefined, // Digest
-            blink::WebCryptoAlgorithmParamsTypeAesKeyGenParams, // GenerateKey
-            blink::WebCryptoAlgorithmParamsTypeNone, // ImportKey
-            Undefined, // DeriveKey
-            Undefined, // DeriveBits
-            blink::WebCryptoAlgorithmParamsTypeNone, // WrapKey
-            blink::WebCryptoAlgorithmParamsTypeNone // UnwrapKey
-        }
-    },
-};
-
-// Initializing the algorithmIdToInfo table above depends on knowing the enum
-// values for algorithm IDs. If those ever change, the table will need to be
-// updated.
-COMPILE_ASSERT(blink::WebCryptoAlgorithmIdAesCbc == 0, AesCbc_idDoesntMatch);
-COMPILE_ASSERT(blink::WebCryptoAlgorithmIdHmac == 1, Hmac_idDoesntMatch);
-COMPILE_ASSERT(blink::WebCryptoAlgorithmIdRsaSsaPkcs1v1_5 == 2, RsaSsaPkcs1v1_5_idDoesntMatch);
-COMPILE_ASSERT(blink::WebCryptoAlgorithmIdSha1 == 3, Sha1_idDoesntMatch);
-COMPILE_ASSERT(blink::WebCryptoAlgorithmIdSha256 == 4, Sha256_idDoesntMatch);
-COMPILE_ASSERT(blink::WebCryptoAlgorithmIdSha384 == 5, Sha384_idDoesntMatch);
-COMPILE_ASSERT(blink::WebCryptoAlgorithmIdSha512 == 6, Sha512_idDoesntMatch);
-COMPILE_ASSERT(blink::WebCryptoAlgorithmIdAesGcm == 7, AesGcm_idDoesntMatch);
-COMPILE_ASSERT(blink::WebCryptoAlgorithmIdRsaOaep == 8, RsaOaep_idDoesntMatch);
-COMPILE_ASSERT(blink::WebCryptoAlgorithmIdAesCtr == 9, AesCtr_idDoesntMatch);
-COMPILE_ASSERT(blink::WebCryptoAlgorithmIdAesKw == 10, AesKw_idDoesntMatch);
-COMPILE_ASSERT(blink::WebCryptoAlgorithmIdLast == 10, Last_idDoesntMatch);
-COMPILE_ASSERT(10 == blink::WebCryptoOperationLast, UpdateParamsMapping);
-
 #if ASSERT_ENABLED
 
 // Essentially std::is_sorted() (however that function is new to C++11).
@@ -372,13 +184,6 @@ bool lookupAlgorithmIdByName(const String& algorithmName, blink::WebCryptoAlgori
     return true;
 }
 
-const AlgorithmInfo* lookupAlgorithmInfo(blink::WebCryptoAlgorithmId id)
-{
-    if (id < 0 || id >= WTF_ARRAY_LENGTH(algorithmIdToInfo))
-        return 0;
-    return &algorithmIdToInfo[id];
-}
-
 void setSyntaxError(const String& message, AlgorithmError* error)
 {
     error->errorType = blink::WebCryptoErrorTypeSyntax;
@@ -896,10 +701,10 @@ bool parseAlgorithm(const Dictionary& raw, blink::WebCryptoOperation op, blink::
     // Remove the "Algorithm:" prefix for all subsequent errors.
     context.removeLast();
 
-    const AlgorithmInfo* algorithmInfo = lookupAlgorithmInfo(algorithmId);
+    const blink::WebCryptoAlgorithmInfo* algorithmInfo = blink::WebCryptoAlgorithm::lookupAlgorithmInfo(algorithmId);
 
-    if (algorithmInfo->operationToParamsType[op] == Undefined) {
-        context.add(algorithmIdToName(algorithmId));
+    if (algorithmInfo->operationToParamsType[op] == blink::WebCryptoAlgorithmInfo::Undefined) {
+        context.add(algorithmInfo->name);
         setNotSupportedError(context.toString("Unsupported operation", operationToString(op)), error);
         return false;
     }
@@ -921,9 +726,4 @@ bool normalizeAlgorithm(const Dictionary& raw, blink::WebCryptoOperation op, bli
     return parseAlgorithm(raw, op, algorithm, ErrorContext(), error);
 }
 
-const char* algorithmIdToName(blink::WebCryptoAlgorithmId id)
-{
-    return lookupAlgorithmInfo(id)->name;
-}
-
 } // namespace WebCore

third_party/WebKit/Source/modules/crypto/NormalizeAlgorithm.h

@@ -37,8 +37,6 @@
 #include "wtf/Assertions.h"
 #include "wtf/Forward.h"
 
-namespace blink { class WebCryptoAlgorithm; }
-
 namespace WebCore {
 
 class Dictionary;
@@ -61,10 +59,6 @@ struct AlgorithmError {
 // [1] http://www.w3.org/TR/WebCryptoAPI/#algorithm-normalizing-rules
 bool normalizeAlgorithm(const Dictionary&, blink::WebCryptoOperation, blink::WebCryptoAlgorithm&, AlgorithmError*) WARN_UNUSED_RETURN;
 
-// Returns a null-terminated C-string literal. Caller can assume the pointer
-// will be valid for the program's entire runtime.
-const char* algorithmIdToName(blink::WebCryptoAlgorithmId);
-
 } // namespace WebCore
 
 #endif

third_party/WebKit/Source/platform/exported/WebCryptoAlgorithm.cpp

@@ -32,11 +32,193 @@
 #include "public/platform/WebCryptoAlgorithm.h"
 
 #include "public/platform/WebCryptoAlgorithmParams.h"
+#include "wtf/Assertions.h"
 #include "wtf/OwnPtr.h"
+#include "wtf/StdLibExtras.h"
 #include "wtf/ThreadSafeRefCounted.h"
 
 namespace blink {
 
+namespace {
+
+// A mapping from the algorithm ID to information about the algorithm.
+const WebCryptoAlgorithmInfo algorithmIdToInfo[] = {
+    { // Index 0
+        "AES-CBC", {
+            WebCryptoAlgorithmParamsTypeAesCbcParams, // Encrypt
+            WebCryptoAlgorithmParamsTypeAesCbcParams, // Decrypt
+            WebCryptoAlgorithmInfo::Undefined, // Sign
+            WebCryptoAlgorithmInfo::Undefined, // Verify
+            WebCryptoAlgorithmInfo::Undefined, // Digest
+            WebCryptoAlgorithmParamsTypeAesKeyGenParams, // GenerateKey
+            WebCryptoAlgorithmParamsTypeNone, // ImportKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveBits
+            WebCryptoAlgorithmParamsTypeAesCbcParams, // WrapKey
+            WebCryptoAlgorithmParamsTypeAesCbcParams // UnwrapKey
+        }
+    }, { // Index 1
+        "HMAC", {
+            WebCryptoAlgorithmInfo::Undefined, // Encrypt
+            WebCryptoAlgorithmInfo::Undefined, // Decrypt
+            WebCryptoAlgorithmParamsTypeNone, // Sign
+            WebCryptoAlgorithmParamsTypeNone, // Verify
+            WebCryptoAlgorithmInfo::Undefined, // Digest
+            WebCryptoAlgorithmParamsTypeHmacKeyGenParams, // GenerateKey
+            WebCryptoAlgorithmParamsTypeHmacImportParams, // ImportKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveBits
+            WebCryptoAlgorithmInfo::Undefined, // WrapKey
+            WebCryptoAlgorithmInfo::Undefined // UnwrapKey
+        }
+    }, { // Index 2
+        "RSASSA-PKCS1-v1_5", {
+            WebCryptoAlgorithmInfo::Undefined, // Encrypt
+            WebCryptoAlgorithmInfo::Undefined, // Decrypt
+            WebCryptoAlgorithmParamsTypeNone, // Sign
+            WebCryptoAlgorithmParamsTypeNone, // Verify
+            WebCryptoAlgorithmInfo::Undefined, // Digest
+            WebCryptoAlgorithmParamsTypeRsaHashedKeyGenParams, // GenerateKey
+            WebCryptoAlgorithmParamsTypeRsaHashedImportParams, // ImportKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveBits
+            WebCryptoAlgorithmInfo::Undefined, // WrapKey
+            WebCryptoAlgorithmInfo::Undefined // UnwrapKey
+        }
+    }, { // Index 3
+        "SHA-1", {
+            WebCryptoAlgorithmInfo::Undefined, // Encrypt
+            WebCryptoAlgorithmInfo::Undefined, // Decrypt
+            WebCryptoAlgorithmInfo::Undefined, // Sign
+            WebCryptoAlgorithmInfo::Undefined, // Verify
+            WebCryptoAlgorithmParamsTypeNone, // Digest
+            WebCryptoAlgorithmInfo::Undefined, // GenerateKey
+            WebCryptoAlgorithmInfo::Undefined, // ImportKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveBits
+            WebCryptoAlgorithmInfo::Undefined, // WrapKey
+            WebCryptoAlgorithmInfo::Undefined // UnwrapKey
+        }
+    }, { // Index 4
+        "SHA-256", {
+            WebCryptoAlgorithmInfo::Undefined, // Encrypt
+            WebCryptoAlgorithmInfo::Undefined, // Decrypt
+            WebCryptoAlgorithmInfo::Undefined, // Sign
+            WebCryptoAlgorithmInfo::Undefined, // Verify
+            WebCryptoAlgorithmParamsTypeNone, // Digest
+            WebCryptoAlgorithmInfo::Undefined, // GenerateKey
+            WebCryptoAlgorithmInfo::Undefined, // ImportKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveBits
+            WebCryptoAlgorithmInfo::Undefined, // WrapKey
+            WebCryptoAlgorithmInfo::Undefined // UnwrapKey
+        }
+    }, { // Index 5
+        "SHA-384", {
+            WebCryptoAlgorithmInfo::Undefined, // Encrypt
+            WebCryptoAlgorithmInfo::Undefined, // Decrypt
+            WebCryptoAlgorithmInfo::Undefined, // Sign
+            WebCryptoAlgorithmInfo::Undefined, // Verify
+            WebCryptoAlgorithmParamsTypeNone, // Digest
+            WebCryptoAlgorithmInfo::Undefined, // GenerateKey
+            WebCryptoAlgorithmInfo::Undefined, // ImportKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveBits
+            WebCryptoAlgorithmInfo::Undefined, // WrapKey
+            WebCryptoAlgorithmInfo::Undefined // UnwrapKey
+        }
+    }, { // Index 6
+        "SHA-512", {
+            WebCryptoAlgorithmInfo::Undefined, // Encrypt
+            WebCryptoAlgorithmInfo::Undefined, // Decrypt
+            WebCryptoAlgorithmInfo::Undefined, // Sign
+            WebCryptoAlgorithmInfo::Undefined, // Verify
+            WebCryptoAlgorithmParamsTypeNone, // Digest
+            WebCryptoAlgorithmInfo::Undefined, // GenerateKey
+            WebCryptoAlgorithmInfo::Undefined, // ImportKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveBits
+            WebCryptoAlgorithmInfo::Undefined, // WrapKey
+            WebCryptoAlgorithmInfo::Undefined // UnwrapKey
+        }
+    }, { // Index 7
+        "AES-GCM", {
+            WebCryptoAlgorithmParamsTypeAesGcmParams, // Encrypt
+            WebCryptoAlgorithmParamsTypeAesGcmParams, // Decrypt
+            WebCryptoAlgorithmInfo::Undefined, // Sign
+            WebCryptoAlgorithmInfo::Undefined, // Verify
+            WebCryptoAlgorithmInfo::Undefined, // Digest
+            WebCryptoAlgorithmParamsTypeAesKeyGenParams, // GenerateKey
+            WebCryptoAlgorithmParamsTypeNone, // ImportKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveBits
+            WebCryptoAlgorithmParamsTypeAesGcmParams, // WrapKey
+            WebCryptoAlgorithmParamsTypeAesGcmParams // UnwrapKey
+        }
+    }, { // Index 8
+        "RSA-OAEP", {
+            WebCryptoAlgorithmParamsTypeRsaOaepParams, // Encrypt
+            WebCryptoAlgorithmParamsTypeRsaOaepParams, // Decrypt
+            WebCryptoAlgorithmInfo::Undefined, // Sign
+            WebCryptoAlgorithmInfo::Undefined, // Verify
+            WebCryptoAlgorithmInfo::Undefined, // Digest
+            WebCryptoAlgorithmParamsTypeRsaHashedKeyGenParams, // GenerateKey
+            WebCryptoAlgorithmParamsTypeRsaHashedImportParams, // ImportKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveBits
+            WebCryptoAlgorithmParamsTypeRsaOaepParams, // WrapKey
+            WebCryptoAlgorithmParamsTypeRsaOaepParams // UnwrapKey
+        }
+    }, { // Index 9
+        "AES-CTR", {
+            WebCryptoAlgorithmParamsTypeAesCtrParams, // Encrypt
+            WebCryptoAlgorithmParamsTypeAesCtrParams, // Decrypt
+            WebCryptoAlgorithmInfo::Undefined, // Sign
+            WebCryptoAlgorithmInfo::Undefined, // Verify
+            WebCryptoAlgorithmInfo::Undefined, // Digest
+            WebCryptoAlgorithmParamsTypeAesKeyGenParams, // GenerateKey
+            WebCryptoAlgorithmParamsTypeNone, // ImportKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveBits
+            WebCryptoAlgorithmParamsTypeAesCtrParams, // WrapKey
+            WebCryptoAlgorithmParamsTypeAesCtrParams // UnwrapKey
+        }
+    }, { // Index 10
+        "AES-KW", {
+            WebCryptoAlgorithmInfo::Undefined, // Encrypt
+            WebCryptoAlgorithmInfo::Undefined, // Decrypt
+            WebCryptoAlgorithmInfo::Undefined, // Sign
+            WebCryptoAlgorithmInfo::Undefined, // Verify
+            WebCryptoAlgorithmInfo::Undefined, // Digest
+            WebCryptoAlgorithmParamsTypeAesKeyGenParams, // GenerateKey
+            WebCryptoAlgorithmParamsTypeNone, // ImportKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveKey
+            WebCryptoAlgorithmInfo::Undefined, // DeriveBits
+            WebCryptoAlgorithmParamsTypeNone, // WrapKey
+            WebCryptoAlgorithmParamsTypeNone // UnwrapKey
+        }
+    },
+};
+
+// Initializing the algorithmIdToInfo table above depends on knowing the enum
+// values for algorithm IDs. If those ever change, the table will need to be
+// updated.
+COMPILE_ASSERT(WebCryptoAlgorithmIdAesCbc == 0, AesCbc_idDoesntMatch);
+COMPILE_ASSERT(WebCryptoAlgorithmIdHmac == 1, Hmac_idDoesntMatch);
+COMPILE_ASSERT(WebCryptoAlgorithmIdRsaSsaPkcs1v1_5 == 2, RsaSsaPkcs1v1_5_idDoesntMatch);
+COMPILE_ASSERT(WebCryptoAlgorithmIdSha1 == 3, Sha1_idDoesntMatch);
+COMPILE_ASSERT(WebCryptoAlgorithmIdSha256 == 4, Sha256_idDoesntMatch);
+COMPILE_ASSERT(WebCryptoAlgorithmIdSha384 == 5, Sha384_idDoesntMatch);
+COMPILE_ASSERT(WebCryptoAlgorithmIdSha512 == 6, Sha512_idDoesntMatch);
+COMPILE_ASSERT(WebCryptoAlgorithmIdAesGcm == 7, AesGcm_idDoesntMatch);
+COMPILE_ASSERT(WebCryptoAlgorithmIdRsaOaep == 8, RsaOaep_idDoesntMatch);
+COMPILE_ASSERT(WebCryptoAlgorithmIdAesCtr == 9, AesCtr_idDoesntMatch);
+COMPILE_ASSERT(WebCryptoAlgorithmIdAesKw == 10, AesKw_idDoesntMatch);
+COMPILE_ASSERT(WebCryptoAlgorithmIdLast == 10, Last_idDoesntMatch);
+COMPILE_ASSERT(10 == WebCryptoOperationLast, UpdateParamsMapping);
+
+} // namespace
+
 class WebCryptoAlgorithmPrivate : public ThreadSafeRefCounted<WebCryptoAlgorithmPrivate> {
 public:
     WebCryptoAlgorithmPrivate(WebCryptoAlgorithmId id, PassOwnPtr<WebCryptoAlgorithmParams> params)
@@ -64,6 +246,13 @@ WebCryptoAlgorithm WebCryptoAlgorithm::adoptParamsAndCreate(WebCryptoAlgorithmId
     return WebCryptoAlgorithm(id, adoptPtr(params));
 }
 
+const WebCryptoAlgorithmInfo* WebCryptoAlgorithm::lookupAlgorithmInfo(WebCryptoAlgorithmId id)
+{
+    if (id < 0 || id >= WTF_ARRAY_LENGTH(algorithmIdToInfo))
+        return 0;
+    return &algorithmIdToInfo[id];
+}
+
 bool WebCryptoAlgorithm::isNull() const
 {
     return m_private.isNull();

third_party/WebKit/public/platform/WebCryptoAlgorithm.h

@@ -85,6 +85,20 @@ enum WebCryptoAlgorithmParamsType {
     WebCryptoAlgorithmParamsTypeAesCtrParams,
 };
 
+struct WebCryptoAlgorithmInfo {
+    typedef char ParamsTypeOrUndefined;
+    static const ParamsTypeOrUndefined Undefined = -1;
+
+    // The canonical (case-sensitive) name for the algorithm as a
+    // null-terminated C-string literal.
+    const char* name;
+
+    // A map from the operation to the expected parameter type of the algorithm.
+    // If an operation is not applicable for the algorithm, set to Undefined.
+    const ParamsTypeOrUndefined operationToParamsType[WebCryptoOperationLast + 1];
+};
+
+
 class WebCryptoAesCbcParams;
 class WebCryptoAesKeyGenParams;
 class WebCryptoHmacImportParams;
@@ -115,6 +129,11 @@ public:
     BLINK_PLATFORM_EXPORT static WebCryptoAlgorithm createNull();
     BLINK_PLATFORM_EXPORT static WebCryptoAlgorithm adoptParamsAndCreate(WebCryptoAlgorithmId, WebCryptoAlgorithmParams*);
 
+    // Returns a WebCryptoAlgorithmInfo for the algorithm with the given ID. If
+    // the ID is invalid, return 0. The caller can assume the pointer will be
+    // valid for the program's entire runtime.
+    BLINK_PLATFORM_EXPORT static const WebCryptoAlgorithmInfo* lookupAlgorithmInfo(WebCryptoAlgorithmId);
+
     ~WebCryptoAlgorithm() { reset(); }
 
     WebCryptoAlgorithm(const WebCryptoAlgorithm& other) { assign(other); }