how to use md5withrsa in .net?

mc 4,456

how to use md5withrsa to hash string with private key?

1 answer

Jiachen Li-MSFT 31,011 Reputation points Microsoft Vendor

2024-05-03T09:15:35.4266667+00:00
Hi @mc ，

Consider the follow steps.

Compute the hash of the string using the MD5 algorithm. Ensure that the input string is properly encoded to bytes using a consistent encoding (e.g., UTF-8).

After computing the hash, you sign it using the RSA private key. This operation generates a digital signature that binds the hash value to the private key.

Best Regards.

Jiachen Li

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mc 4,456 Reputation points

2024-05-03T13:31:47.3366667+00:00

how to sign using RSA private key

Jiachen Li-MSFT 31,011 Reputation points Microsoft Vendor

2024-05-06T07:15:32.71+00:00

Check the following example.

string data = "Hello, world!"; byte[] dataBytes = Encoding.UTF8.GetBytes(data); byte[] hashBytes = MD5.Create().ComputeHash(dataBytes); byte[] signatureBytes = rsa.SignHash(hashBytes, HashAlgorithmName.MD5, RSASignaturePadding.Pkcs1); // Convert the signature to a base64 string for storage or transmission string signatureBase64 = Convert.ToBase64String(signatureBytes);
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