我尝试按照以下步骤来验证授权码:
验证来自授权的授权码 具有ID令牌的端点,客户端应执行以下操作:
1-)将带有哈希值的代码的ASCII表示形式的八位字节哈希 JWA [JWA]中为alg标头参数指定的算法 ID令牌的JOSE标头。例如,如果alg是RS256,则哈希 使用的算法是SHA-256。
2-)取哈希的最左半部分,然后 base64url对其进行编码。
3-) ID令牌中的c_hash值必须匹配 如果ID中存在c_hash,则在上一步中生成的值 令牌。
当我第一次请求授权终结点以尝试从WebForms客户端对用户进行身份验证时,我具有此CODE:
code=0655d48df75629d9fdbd5a060141bf66ca04418a0e762a6a5e6382c2748753af
我也有这个C_HASH,我可以从id_token那里得到它:
"c_hash": "QadHSCSim4aHM8q1F1F6Bg"
我正尝试通过下一个验证代码:
Private Shared Function IsValidAuthorizationCode(authorizationCode As String, stringIdTokenPayload As String) As Boolean
Dim serializer As New JavaScriptSerializer()
Dim BytesPayload As Byte() = Decode(stringIdTokenPayload)
Dim stringPayload As String = System.Text.ASCIIEncoding.ASCII.GetString(BytesPayload)
Dim deserialized_payload = serializer.Deserialize(Of Dictionary(Of String, Object))(stringPayload)
Dim c_hash = deserialized_payload.Item("c_hash").ToString()
Dim mySHA256 = SHA256Managed.Create()
Dim authorizationCodeOCTETS = Decode(authorizationCode)
Dim elemntsToIterate = mySHA256.ComputeHash(authorizationCodeOCTETS)
Dim length = elemntsToIterate.Length
Dim hashedCode(length/2 - 1) As Byte
Dim count = -1
For Each element As Byte in elemntsToIterate
count += 1
If count > 15 Then
hashedCode(count - 16) = element
End If
Next
Dim hashedCodeLikeString = Convert.ToBase64String(hashedCode)
If hashedCodeLikeString.Length <> hashedCode.Length
Return False
Dim result As Boolean = True
For value As Integer = 0 To hashedCodeLikeString.Length
If (hashedCodeLikeString(value) <> hashedCode(value)) Then
result = False
Exit For
End If
Next
Return result
End Function
但是我没有得到预期的结果。我需要获取一个TRUE值,但我得到一个FALSE。我认为我做错了什么,但我看不出它是什么。有什么帮助吗?
非常感谢您。
答案 0 :(得分:1)
我不知道您的编程语言,但这是OidcClient的代码
https://github.com/IdentityModel/IdentityModel.OidcClient2
public bool ValidateHash(string data, string hashedData, string signatureAlgorithm)
{
var hashAlgorithm = GetMatchingHashAlgorithm(signatureAlgorithm);
using (hashAlgorithm)
{
var hash = hashAlgorithm.ComputeHash(Encoding.ASCII.GetBytes(data));
byte[] leftPart = new byte[hashAlgorithm.HashSize / 16];
Array.Copy(hash, leftPart, hashAlgorithm.HashSize / 16);
var leftPartB64 = Base64Url.Encode(leftPart);
var match = leftPartB64.Equals(hashedData);
if (!match)
{
_logger.LogError($"data ({leftPartB64}) does not match hash from token ({hashedData})");
}
return match;
}
}
public HashAlgorithm GetMatchingHashAlgorithm(string signatureAlgorithm)
{
var signingAlgorithmBits = int.Parse(signatureAlgorithm.Substring(signatureAlgorithm.Length - 3));
switch (signingAlgorithmBits)
{
case 256:
_logger.LogDebug("SHA256");
return SHA256.Create();
case 384:
_logger.LogDebug("SHA384");
return SHA384.Create();
case 512:
_logger.LogDebug("SHA512");
return SHA512.Create();
default:
return null;
}
}