I need help using BCrypt to communicate between my C# app and my C app. Specifically, I need to imbed the private key inside my C application and then imbed the public key inside my C# app since my C# needs to send data and my C app which needs to be able to decrypt the data. Later the C# code will be running on a server but for now it's all being tested locally. Anyways the issue I am having is that I am getting a 0x80090005 aka NTE_BAD_DATA error code originating from my 'BCryptImportKeyPair' function call. This tells me that my calls to 'bcrypt' are working since the BCryptOpenAlgorithmProvider function succeeded. Anyways the following is my C code.
// The following is a global field (total length is 1163)
unsigned char g_privateKeyBlob[] = { 0x52, 0x53, 0x41, 0x32, 0x00, 0x08, 0x00, 0x00, 0x01, 0x00, 0x01, 0x11, 0xEA, 0x1C, 0xC5, 0xD3, 0x18, 0x38, 0xF1, 0x57, 0x1D, 0x77, 0x34, 0x59, 0x41, 0xAA, 0x5C, 0x90, 0xA5, 0x6B, 0x97, 0x3E, 0x5B, 0x8C, 0x9F, 0x2F, 0xAB, 0x9E, 0xA8, 0x07, 0x7B, 0x66, 0x2C, 0xC3, 0xBE, 0x1C, 0x59, 0x4F, 0x6E, 0xFF, 0xBA, 0x95, 0x5D, 0xDA, 0xBD, 0xC0, 0x3D, 0x51, 0x3D, 0x61, 0x57, 0xF7, 0xCA, 0xAF, 0x1F, 0x84, 0x9F, 0x09, 0x23, 0x30, 0x20, 0xE6, 0xDD, 0x7A, 0x9F, 0x71, 0x04, 0x20, 0xE6, 0x8D, 0x40, 0x74, 0x01, 0x8C, 0xBE, 0x9D, 0x19, 0xA3, 0x89, 0xA0, 0xF7, 0x03, 0x48, 0xF9, 0x70, 0xC5, 0x0D, 0xEB, 0x31, 0x65, 0xFB, 0xA7, 0x5E, 0x26, 0x11, 0x03, 0xD4, 0xDA, 0xBD, 0x61, 0x9D, 0x8A, 0x3F, 0x0C, 0xA1, 0xB4, 0x03, 0xFC, 0xA5, 0x15, 0x72, 0x4C, 0x3F, 0xB1, 0x5B, 0x03, 0x8B, 0x32, 0x68, 0xBB, 0x00, 0x15, 0x1B, 0xD3, 0x14, 0x80, 0xBE, 0xD4, 0x15, 0x7C, 0x6F, 0x2C, 0xB2, 0x97, 0x43, 0x3D, 0x2A, 0x1C, 0x0A, 0xF6, 0xF0, 0x9D, 0xB4, 0xEF, 0x74, 0x62, 0xBB, 0xF8, 0x9B, 0x32, 0xA9, 0x32, 0x08, 0xB0, 0x8C, 0xC0, 0x1A, 0x60, 0x5A, 0x3F, 0x93, 0x2C, 0x56, 0x0A, 0x7B, 0xED, 0xDD, 0xCC, 0x0B, 0x2D, 0xC2, 0xAC, 0x6A, 0x1B, 0x6F, 0x13, 0x9D, 0xF2, 0xD2, 0x8A, 0x75, 0x83, 0xDA, 0x4F, 0xE5, 0x36, 0xE8, 0xCE, 0x82, 0x7B, 0xAA, 0x16, 0x3A, 0x07, 0xB8, 0x11, 0x6C, 0x42, 0xCF, 0xFC, 0x19, 0x59, 0x6C, 0x43, 0x79, 0xC0, 0xD0, 0x37, 0x5B, 0xE7, 0xA5, 0x7A, 0xCB, 0xDD, 0x06, 0x02, 0x18, 0x5B, 0xE9, 0xD2, 0xF8, 0x6C, 0x0C, 0x87, 0x50, 0x2D, 0x12, 0x04, 0x40, 0x1A, 0xB5, 0x02, 0xA8, 0xE5, 0xFB, 0xD6, 0x96, 0x35, 0x6B, 0x3F, 0xC3, 0x89, 0x30, 0xAE, 0x15, 0x06, 0xD2, 0xC3, 0x0F, 0xE7, 0xE7, 0xA2, 0x8A, 0xF4, 0x63, 0x38, 0xE7, 0xE3, 0xD5, 0x63, 0xB1, 0x85, 0xC0, 0xDE, 0x8A, 0x50, 0xDC, 0x34, 0xEB, 0x3A, 0xDC, 0x0D, 0x61, 0x48, 0x09, 0x18, 0x8F, 0xA9, 0x9D, 0xD7, 0x83, 0xE3, 0x1A, 0x84, 0x20, 0x48, 0x7E, 0x96, 0xA9, 0x5F, 0xA6, 0x3F, 0x49, 0x60, 0x0E, 0xC7, 0x54, 0xB6, 0xCA, 0xFE, 0xC8, 0x91, 0xE2, 0x5F, 0x92, 0x71, 0xE8, 0x10, 0x3A, 0x6B, 0x52, 0xBB, 0x67, 0x77, 0xB9, 0x00, 0x5F, 0xC7, 0x8F, 0xB4, 0x88, 0x42, 0x99, 0x8F, 0xC3, 0xBF, 0xC3, 0xFF, 0x90, 0x08, 0x59, 0xF4, 0xBA, 0xA2, 0x8B, 0xE0, 0x32, 0xA9, 0x11, 0x0A, 0x2C, 0x59, 0xB0, 0xB0, 0x57, 0xBE, 0xF1, 0xC6, 0xC2, 0xC6, 0x7C, 0xAA, 0x72, 0x0E, 0x38, 0xE8, 0x17, 0x8D, 0x3C, 0x31, 0x97, 0x5A, 0x0F, 0xCD, 0xC8, 0xAC, 0xDF, 0x47, 0x03, 0x4C, 0xEE, 0x96, 0xFC, 0x00, 0xDF, 0x22, 0xD4, 0x23, 0x56, 0x07, 0x33, 0xBF, 0xD4, 0x13, 0xF7, 0x7B, 0x22, 0xDF, 0xDD, 0xA4, 0x34, 0xE0, 0x66, 0x87, 0xF7, 0x18, 0xD5, 0x4E, 0xB1, 0x70, 0xF0, 0xEE, 0x40, 0x06, 0x6F, 0x55, 0xDA, 0xE5, 0x30, 0xEC, 0xAC, 0x82, 0x2B, 0xA9, 0x2F, 0x3A, 0x04, 0xEE, 0xB1, 0x55, 0x0E, 0x2A, 0x44, 0x29, 0xC1, 0xC9, 0x50, 0x50, 0x1A, 0x1C, 0xA8, 0x75, 0x47, 0x74, 0x76, 0x4C, 0xE1, 0x09, 0x1A, 0xB1, 0x80, 0x5E, 0x8B, 0x0A, 0xFD, 0xF1, 0xB5, 0x97, 0x67, 0xB0, 0x06, 0x73, 0xC8, 0xE0, 0x60, 0x48, 0x62, 0xC6, 0xD1, 0xCC, 0xDF, 0x7A, 0xE5, 0xFB, 0x80, 0xA1, 0x0D, 0x23, 0x61, 0x78, 0x44, 0x83, 0x16, 0xEC, 0xC2, 0x95, 0x16, 0x1F, 0x9D, 0x3B, 0x8F, 0xB7, 0x2A, 0x2E, 0x73, 0x4D, 0xAB, 0x6A, 0xFE, 0x22, 0x76, 0x4D, 0xC4, 0xE8, 0x2C, 0xF8, 0x0B, 0x91, 0x85, 0x10, 0xF6, 0x66, 0xE4, 0x46, 0x5D, 0x1A, 0x5F, 0x0E, 0xBF, 0xB3, 0xF6, 0x91, 0xEF, 0xE7, 0xDB, 0x52, 0xE1, 0x4D, 0x30, 0xCA, 0xFD, 0xD4, 0x38, 0xC5, 0x5F, 0xC5, 0xB1, 0x6F, 0xEA, 0xDE, 0x5A, 0x57, 0x24, 0x9A, 0xEB, 0x81, 0xF9, 0xF6, 0x72, 0x28, 0x8F, 0xF6, 0x84, 0xD4, 0xF2, 0xC6, 0x2B, 0x0E, 0x55, 0xC2, 0x78, 0x2E, 0xA2, 0xFF, 0x1D, 0x14, 0x76, 0xD0, 0x48, 0x56, 0x44, 0x66, 0x3F, 0x56, 0x4E, 0xA5, 0xF6, 0x74, 0xFA, 0x42, 0x77, 0x36, 0x10, 0xED, 0x57, 0x08, 0x10, 0x0F, 0x88, 0xEB, 0x57, 0x34, 0x7E, 0xCF, 0x27, 0x8B, 0x68, 0x4A, 0x75, 0x71, 0x0B, 0x70, 0x71, 0xA7, 0x35, 0xE6, 0x52, 0x26, 0x51, 0x94, 0x7F, 0xDE, 0x90, 0xB1, 0x7E, 0xCD, 0xDB, 0x99, 0x04, 0xED, 0x6C, 0xA5, 0x19, 0x7B, 0x72, 0x6D, 0xF5, 0xC2, 0xBA, 0xBA, 0xB7, 0xB5, 0xC6, 0xFF, 0x4B, 0xD7, 0xFE, 0x95, 0x25, 0x01, 0x14, 0x25, 0xF1, 0x06, 0x91, 0x3E, 0xE2, 0xF7, 0xDA, 0x78, 0xB8, 0x5B, 0x58, 0x9B, 0xB6, 0xFC, 0xDB, 0xD4, 0xD0, 0x61, 0xFC, 0xD4, 0x1F, 0xFA, 0x0E, 0x77, 0xF2, 0xCA, 0xC0, 0x8E, 0x36, 0xE3, 0xD3, 0xB1, 0x39, 0x4B, 0xDA, 0xEE, 0xF4, 0x3B, 0xC0, 0xA6, 0x95, 0x6E, 0x79, 0xDC, 0xBC, 0x24, 0x62, 0x1A, 0x81, 0x1B, 0x38, 0xA4, 0xCC, 0xAE, 0xD0, 0x89, 0x7C, 0x50, 0x29, 0x1C, 0x3B, 0x2D, 0xFE, 0xEF, 0x56, 0x7A, 0xA6, 0xC5, 0x13, 0x14, 0x10, 0x33, 0xCA, 0xF5, 0x9B, 0x22, 0xB0, 0x0F, 0x52, 0x96, 0xDA, 0x59, 0x3F, 0xCD, 0xE7, 0x5C, 0xFE, 0xBB, 0xC5, 0x3F, 0x07, 0x54, 0x4C, 0xB9, 0x33, 0x01, 0x95, 0xF5, 0x9E, 0xC4, 0x99, 0x84, 0xE6, 0x6D, 0xBB, 0xA8, 0x87, 0xCD, 0x84, 0x94, 0x5C, 0xB3, 0x4B, 0x2D, 0x80, 0xAC, 0xAC, 0x97, 0x0B, 0x5D, 0xB8, 0xE1, 0x4F, 0xAC, 0x90, 0x3F, 0x05, 0xCE, 0x74, 0x08, 0x3C, 0x08, 0xD2, 0x35, 0x4E, 0xF9, 0xC7, 0x01, 0x13, 0x07, 0xA1, 0x04, 0x77, 0x24, 0xB8, 0x77, 0xDA, 0x3F, 0xDE, 0xBA, 0xCF, 0x3A, 0x32, 0xDB, 0x5D, 0xFD, 0xDA, 0x02, 0xEC, 0xFF, 0x4D, 0x49, 0x22, 0x61, 0x54, 0x53, 0xEC, 0x14, 0x50, 0x22, 0x55, 0xA1, 0x34, 0x4A, 0x0A, 0xAD, 0xE1, 0x6B, 0x79, 0xE0, 0x44, 0xEB, 0x06, 0xB6, 0xAC, 0x65, 0xCF, 0x21, 0x9C, 0x9D, 0xD4, 0xB0, 0xCB, 0x70, 0x63, 0x3D, 0xAC, 0xB2, 0x48, 0x2C, 0x55, 0xCD, 0x22, 0x83, 0x3B, 0x95, 0x7D, 0xC7, 0x78, 0xF6, 0x91, 0x7A, 0xCB, 0x89, 0xEA, 0xF9, 0x36, 0xFB, 0x89, 0x8A, 0xDB, 0x4F, 0xB3, 0x8D, 0x9E, 0x89, 0xCF, 0xB0, 0xC1, 0xA8, 0x48, 0x3C, 0x9A, 0x2E, 0x88, 0x1F, 0x37, 0x5B, 0xA6, 0xEF, 0x6B, 0x22, 0x9C, 0x25, 0xBB, 0xC6, 0xF7, 0x78, 0xA1, 0xD0, 0xC1, 0xF3, 0xA0, 0x06, 0xE4, 0x3A, 0x88, 0x08, 0x61, 0x1C, 0x5C, 0x74, 0x3B, 0x99, 0x5C, 0x95, 0x9B, 0x37, 0xE2, 0x54, 0x57, 0x2E, 0x97, 0x22, 0x76, 0xC5, 0x46, 0xBC, 0x5B, 0xF8, 0xB7, 0xDE, 0xFE, 0xC7, 0x31, 0xA0, 0xEB, 0x4D, 0xA3, 0xAC, 0xC1, 0x2D, 0x3D, 0xC9, 0xD5, 0x97, 0x40, 0x43, 0x37, 0x6E, 0x63, 0x97, 0xC1, 0x50, 0xE1, 0x97, 0x9E, 0xCB, 0xC5, 0xBC, 0x09, 0x86, 0x8D, 0xF5, 0xBA, 0xF4, 0xD8, 0x7E, 0xDD, 0x0D, 0x07, 0x94, 0x33, 0x7D, 0xCE, 0x43, 0xA9, 0xD6, 0x70, 0x1B, 0x8A, 0x0C, 0x02, 0xCC, 0x37, 0x3F, 0x0B, 0x68, 0x0B, 0xA4, 0xBE, 0xDF, 0x30, 0xD3, 0x8A, 0x24, 0x06, 0xFE, 0x25, 0xFE, 0x50, 0x56, 0x61, 0xA2, 0x23, 0x20, 0x5F, 0xA5, 0x04, 0x62, 0x19, 0xE7, 0xCD, 0xF5, 0xC0, 0x9C, 0xF1, 0xED, 0x16, 0x2F, 0xED, 0x16, 0x1E, 0x18, 0xB4, 0x80, 0x4F, 0xF8, 0x0D, 0x94, 0xDD, 0xD2, 0xDB, 0xD9, 0x99, 0xE7, 0x7B, 0x58, 0x70, 0x4C, 0xA0, 0x85, 0x19, 0x5C, 0x22, 0xD8, 0x41, 0xD6, 0xFA, 0xF5, 0x00, 0x84, 0x4D, 0x89, 0x01, 0x25, 0xB2, 0xFB, 0x4A, 0xE6, 0x14, 0xB8, 0x9D, 0x19, 0xCD, 0x55, 0xA9, 0xB6, 0x72, 0x23, 0xCB, 0x92, 0x09, 0xDF, 0x2D, 0xD1, 0x46, 0xBC, 0x17, 0x9A, 0x9F, 0xC6, 0xB3, 0xFC, 0x76, 0x94, 0xAE, 0x09, 0x7A, 0x58, 0xE3, 0x9B, 0xCB, 0xFD, 0x54, 0x93, 0x56, 0x27, 0x25, 0xA7, 0xAB, 0x02, 0xBD, 0x67, 0x78, 0xBE, 0x9A, 0xF6, 0xE2, 0x2C, 0xD8, 0x7C, 0x4D, 0x75, 0x9F, 0x8D, 0x05, 0x8E, 0x93, 0x84, 0xE9, 0x75, 0x34, 0xAF, 0xE7, 0xA1, 0x79, 0x37, 0x05, 0xE0, 0x07, 0x24, 0xC4, 0x4F, 0x10, 0x14, 0x24, 0x31, 0xCE, 0x8E, 0x44, 0x2D, 0x67, 0x34, 0xAF, 0xB2, 0xAA, 0x8D, 0xBF, 0xC2, 0x6E, 0x4F, 0x78, 0x02, 0x75, 0xC3, 0x4F, 0xAB, 0xC8, 0xFB, 0x58, 0x1C, 0x36, 0xB3, 0xBD, 0x8E, 0x17, 0xA8, 0xAC, 0xB2, 0x50 };
typedef struct {
WCHAR Buffer[128]; // 256 bytes for UTF-16 characters.
USHORT Length;
UCHAR EncryptedData[256];
} Handshake, * PHandshake;
PHandshake handshakeData = (PHandshake)buffer;
ULONG privateKeyBlobLength = sizeof(g_privateKeyBlob);
PUCHAR decryptedData = NULL;
ULONG decryptedDataLength = 0;
NTSTATUS stat = DecryptRsaData(handshakeData->EncryptedData, 256, g_privateKeyBlob, privateKeyBlobLength, &decryptedData, &decryptedDataLength);
NTSTATUS DecryptRsaData(
PUCHAR encryptedData, ULONG encryptedDataLength,
PUCHAR privateKeyBlob, ULONG privateKeyBlobLength,
PUCHAR* decryptedData, PULONG decryptedDataLength) {
BCRYPT_ALG_HANDLE algHandle = NULL;
BCRYPT_KEY_HANDLE keyHandle = NULL;
NTSTATUS status = STATUS_UNSUCCESSFUL;
DebugMessage("DecryptRsaData 1 \n");
// Open an algorithm provider for RSA.
status = BCryptOpenAlgorithmProvider(&algHandle, BCRYPT_RSA_ALGORITHM, NULL, 0);
if (!NT_SUCCESS(status)) {
return status;
}
DebugMessage("DecryptRsaData 2 \n");
// Import the private key.
status = BCryptImportKeyPair(algHandle, NULL, BCRYPT_RSAPRIVATE_BLOB, &keyHandle,
privateKeyBlob, privateKeyBlobLength, 0);
if (!NT_SUCCESS(status)) {
BCryptCloseAlgorithmProvider(algHandle, 0);
return status;
}
Anyways since I need to imbed the private and public keys here is how I generated them using C#'s (imported with using System.Security.Cryptography) RSA encryption algorithm. This code generates the public and private key and then it puts the private key into a form that I can copy and paste into my C program in a form it can read.
public static void GenerateRsaKeys(out string publicKeyXml, out string privateKeyXml)
{
using (var rsa = new RSACryptoServiceProvider(2048)) // Use 2048-bit for security
{
publicKeyXml = rsa.ToXmlString(false); // Export public key
privateKeyXml = rsa.ToXmlString(true); // Export private key
RSAParameters parameters = rsa.ExportParameters(true);
byte[] privateKeyBlob = ConvertRsaParametersToPrivateKeyBlob(parameters);
string hexPrivateKeyBlob = ToHexString(privateKeyBlob);
Console.WriteLine("PrivateHexBlob:" + hexPrivateKeyBlob);
}
}
public static byte[] ConvertRsaParametersToPrivateKeyBlob(RSAParameters parameters)
{
// Magic header for BCrypt RSAPRIVATE_BLOB
byte[] magic = BitConverter.GetBytes(0x32415352); // RSA2
byte[] bitLength = BitConverter.GetBytes(parameters.Modulus.Length * 8);
byte[] publicExponent = ReverseBytes(parameters.Exponent); // Ensure big-endian byte order
byte[] modulus = ReverseBytes(parameters.Modulus);
byte[] prime1 = ReverseBytes(parameters.P);
byte[] prime2 = ReverseBytes(parameters.Q);
byte[] exponent1 = ReverseBytes(parameters.DP);
byte[] exponent2 = ReverseBytes(parameters.DQ);
byte[] coefficient = ReverseBytes(parameters.InverseQ);
byte[] privateExponent = ReverseBytes(parameters.D);
// Concatenate all byte arrays together into a single blob
byte[] privateKeyBlob = ConcatenateByteArrays(magic, bitLength, publicExponent, modulus, prime1, prime2, exponent1, exponent2, coefficient, privateExponent);
return privateKeyBlob;
}
private static byte[] ReverseBytes(byte[] input)
{
// Reverse byte array to switch between little-endian and big-endian
Array.Reverse(input);
return input;
}
public static string ToHexString(byte[] bytes)
{
System.Text.StringBuilder sb = new System.Text.StringBuilder(bytes.Length * 5);
for (int i = 0; i < bytes.Length; i++)
{
sb.Append("0x");
sb.Append(bytes[i].ToString("X2")); // "X2" format specifier to get two hexadecimal characters
if (i < bytes.Length - 1)
{
sb.Append(", ");
}
}
return sb.ToString();
}
private static byte[] ConcatenateByteArrays(params byte[][] arrays)
{
var result = new byte[arrays.Sum(a => a.Length)];
int offset = 0;
foreach (byte[] array in arrays)
{
Buffer.BlockCopy(array, 0, result, offset, array.Length);
offset += array.Length;
}
return result;
}
Here is what this code produces for the private and public keys along with the code I use to actually encrypt a test string.
public static byte[] EncryptDataWithPublicKey(string dataToEncrypt, string publicKeyXml)
{
using (var rsa = new RSACryptoServiceProvider())
{
// Load the RSA public key
rsa.FromXmlString(publicKeyXml);
// Convert the data to encrypt to a byte array
var dataToEncryptBytes = Encoding.UTF8.GetBytes(dataToEncrypt);
// Encrypt the data. OAEP padding is recommended for new applications.
var encryptedData = rsa.Encrypt(dataToEncryptBytes, false); // Set to true to use OAEP padding
return encryptedData;
}
}
PrivateHexBlob:0x52, 0x53, 0x41, 0x32, 0x00, 0x08, 0x00, 0x00, 0x01, 0x00, 0x01, 0x11, 0xEA, 0x1C, 0xC5, 0xD3, 0x18, 0x38, 0xF1, 0x57, 0x1D, 0x77, 0x34, 0x59, 0x41, 0xAA, 0x5C, 0x90, 0xA5, 0x6B, 0x97, 0x3E, 0x5B, 0x8C, 0x9F, 0x2F, 0xAB, 0x9E, 0xA8, 0x07, 0x7B, 0x66, 0x2C, 0xC3, 0xBE, 0x1C, 0x59, 0x4F, 0x6E, 0xFF, 0xBA, 0x95, 0x5D, 0xDA, 0xBD, 0xC0, 0x3D, 0x51, 0x3D, 0x61, 0x57, 0xF7, 0xCA, 0xAF, 0x1F, 0x84, 0x9F, 0x09, 0x23, 0x30, 0x20, 0xE6, 0xDD, 0x7A, 0x9F, 0x71, 0x04, 0x20, 0xE6, 0x8D, 0x40, 0x74, 0x01, 0x8C, 0xBE, 0x9D, 0x19, 0xA3, 0x89, 0xA0, 0xF7, 0x03, 0x48, 0xF9, 0x70, 0xC5, 0x0D, 0xEB, 0x31, 0x65, 0xFB, 0xA7, 0x5E, 0x26, 0x11, 0x03, 0xD4, 0xDA, 0xBD, 0x61, 0x9D, 0x8A, 0x3F, 0x0C, 0xA1, 0xB4, 0x03, 0xFC, 0xA5, 0x15, 0x72, 0x4C, 0x3F, 0xB1, 0x5B, 0x03, 0x8B, 0x32, 0x68, 0xBB, 0x00, 0x15, 0x1B, 0xD3, 0x14, 0x80, 0xBE, 0xD4, 0x15, 0x7C, 0x6F, 0x2C, 0xB2, 0x97, 0x43, 0x3D, 0x2A, 0x1C, 0x0A, 0xF6, 0xF0, 0x9D, 0xB4, 0xEF, 0x74, 0x62, 0xBB, 0xF8, 0x9B, 0x32, 0xA9, 0x32, 0x08, 0xB0, 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0xAC, 0xB2, 0x50
Public Key:
<RSAKeyValue><Modulus>5zhj9Iqi5+cPw9IGFa4wicM/azWW1vvlqAK1GkAEEi1Qhwxs+NLpWxgCBt3LeqXnWzfQwHlDbFkZ/M9CbBG4BzoWqnuCzug25U/ag3WK0vKdE28baqzCLQvM3e17ClYskz9aYBrAjLAIMqkym/i7YnTvtJ3w9gocKj1Dl7Isb3wV1L6AFNMbFQC7aDKLA1uxP0xyFaX8A7ShDD+KnWG92tQDESZep/tlMesNxXD5SAP3oImjGZ2+jAF0QI3mIARxn3rd5iAwIwmfhB+vyvdXYT1RPcC92l2Vuv9uT1kcvsMsZnsHqJ6rL5+MWz6Xa6WQXKpBWTR3HVfxOBjTxRzqEQ==</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>
Private Key:
<RSAKeyValue><Modulus>5zhj9Iqi5+cPw9IGFa4wicM/azWW1vvlqAK1GkAEEi1Qhwxs+NLpWxgCBt3LeqXnWzfQwHlDbFkZ/M9CbBG4BzoWqnuCzug25U/ag3WK0vKdE28baqzCLQvM3e17ClYskz9aYBrAjLAIMqkym/i7YnTvtJ3w9gocKj1Dl7Isb3wV1L6AFNMbFQC7aDKLA1uxP0xyFaX8A7ShDD+KnWG92tQDESZep/tlMesNxXD5SAP3oImjGZ2+jAF0QI3mIARxn3rd5iAwIwmfhB+vyvdXYT1RPcC92l2Vuv9uT1kcvsMsZnsHqJ6rL5+MWz6Xa6WQXKpBWTR3HVfxOBjTxRzqEQ==</Modulus><Exponent>AQAB</Exponent><P>9xPUvzMHViPUIt8A/JbuTANH36zIzQ9alzE8jRfoOA5yqnzGwsbxvlewsFksChGpMuCLorr0WQiQ/8O/w4+ZQoi0j8dfALl3Z7tSazoQ6HGSX+KRyP7KtlTHDmBJP6ZfqZZ+SCCEGuOD152pjxgJSGEN3DrrNNxQit7AhbFj1eM=</P><Q>75H2s78OXxpdRuRm9hCFkQv4LOjETXYi/mqrTXMuKrePO50fFpXC7BaDRHhhIw2hgPvlet/M0cZiSGDgyHMGsGeXtfH9CotegLEaCeFMdnRHdagcGlBQycEpRCoOVbHuBDovqSuCrOww5dpVbwZA7vBwsU7VGPeHZuA0pN3fIns=</Q><DP>uHja9+I+kQbxJRQBJZX+10v/xrW3urrC9W1yexmlbO0EmdvNfrGQ3n+UUSZS5jWncXALcXVKaIsnz340V+uIDxAIV+0QNndC+nT2pU5WP2ZEVkjQdhQd/6IueMJVDivG8tSE9o8ocvb5geuaJFda3upvscVfxTjU/cowTeFS2+c=</DP><DQ>x/lONdIIPAh0zgU/kKxP4bhdC5esrIAtS7NclITNh6i7beaEmcSe9ZUBM7lMVAc/xbv+XOfNP1nallIPsCKb9cozEBQTxaZ6Vu/+LTscKVB8idCuzKQ4G4EaYiS83HlulabAO/Tu2ks5sdPjNo7AyvJ3Dvof1Pxh0NTb/LabWFs=</DQ><InverseQ>XJk7dFwcYQiIOuQGoPPB0KF498a7JZwia++mWzcfiC6aPEiowbDPiZ6Ns0/bion7Nvnqict6kfZ4x32VO4MizVUsSLKsPWNwy7DUnZwhz2WstgbrROB5a+GtCko0oVUiUBTsU1RhIklN/+wC2v1d2zI6z7reP9p3uCR3BKEHEwE=</InverseQ><D>ULKsqBeOvbM2HFj7yKtPw3UCeE9uwr+NqrKvNGctRI7OMSQUEE/EJAfgBTd5oeevNHXphJOOBY2fdU182Czi9pq+eGe9AqunJSdWk1T9y5vjWHoJrpR2/LPGn5oXvEbRLd8JkssjcrapVc0ZnbgU5kr7siUBiU2EAPX61kHYIlwZhaBMcFh755nZ29LdlA34T4C0GB4W7S8W7fGcwPXN5xliBKVfICOiYVZQ/iX+BiSK0zDfvqQLaAs/N8wCDIobcNapQ859M5QHDd1+2PS69Y2GCbzFy56X4VDBl2NuN0NAl9XJPS3BrKNN66Axx/7et/hbvEbFdiKXLldU4jeblQ==</D></RSAKeyValue>
private readonly string PublicKey = @"<RSAKeyValue><Modulus>5zhj9Iqi5+cPw9IGFa4wicM/azWW1vvlqAK1GkAEEi1Qhwxs+NLpWxgCBt3LeqXnWzfQwHlDbFkZ/M9CbBG4BzoWqnuCzug25U/ag3WK0vKdE28baqzCLQvM3e17ClYskz9aYBrAjLAIMqkym/i7YnTvtJ3w9gocKj1Dl7Isb3wV1L6AFNMbFQC7aDKLA1uxP0xyFaX8A7ShDD+KnWG92tQDESZep/tlMesNxXD5SAP3oImjGZ2+jAF0QI3mIARxn3rd5iAwIwmfhB+vyvdXYT1RPcC92l2Vuv9uT1kcvsMsZnsHqJ6rL5+MWz6Xa6WQXKpBWTR3HVfxOBjTxRzqEQ==</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
byte[] encryptedData = EncryptDataWithPublicKey("Test", PublicKey);
Anyways then after sending said data to my C program it generated the error I talked about above. I did verify that all pointers are valid, and that the data received by the C program was the same as what the C# program sent but that part does not really matter because I am fairly sure the issue is my private key is not in the correct form or I generated a private key that was not compatible with the C version of RSA. Also, once I get this working, I will regenerate a new key pair since exposing them to the internet would be a dumb idea but if you have a solution to make these two RSA methods work, please let me know!
Edit: I modified my code to the following which did invert the Endianness but I still get the same error.
public static byte[] ConvertRsaParametersToPrivateKeyBlob(RSAParameters parameters)
{
// Magic header for BCrypt RSAPRIVATE_BLOB
byte[] magic = BitConverter.GetBytes(0x32415352); // RSA2
if (BitConverter.IsLittleEndian) Array.Reverse(magic); // Ensure big-endian byte order
byte[] bitLength = BitConverter.GetBytes(parameters.Modulus.Length * 8);
if (BitConverter.IsLittleEndian) Array.Reverse(bitLength); // Ensure big-endian byte order
byte[] publicExponent = EnsureBigEndian(parameters.Exponent);
byte[] modulus = EnsureBigEndian(parameters.Modulus);
byte[] prime1 = EnsureBigEndian(parameters.P);
byte[] prime2 = EnsureBigEndian(parameters.Q);
byte[] exponent1 = EnsureBigEndian(parameters.DP);
byte[] exponent2 = EnsureBigEndian(parameters.DQ);
byte[] coefficient = EnsureBigEndian(parameters.InverseQ);
byte[] privateExponent = EnsureBigEndian(parameters.D);
// Concatenate all byte arrays together into a single blob
byte[] privateKeyBlob = ConcatenateByteArrays(magic, bitLength, publicExponent, modulus, prime1, prime2, exponent1, exponent2, coefficient, privateExponent);
return privateKeyBlob;
}
private static byte[] EnsureBigEndian(byte[] data)
{
if (BitConverter.IsLittleEndian) Array.Reverse(data); // Convert to big-endian if system is little-endian
return data;
}