internal static RSAParameters CreateSigningInformationFromKeyBLOB(Byte[] blob, AssemblyHashAlgorithm?signingAlgorithm, out Byte[] publicKey, out AssemblyHashAlgorithm actualSigningAlgorithm)
{
// There might be actual key after a header, if first byte is zero.
var hasHeader = blob[0] == 0x00;
Int32 pkLen, algID;
var retVal = CreateRSAParametersFromCapiBLOB(blob, hasHeader ? CAPI_HEADER_SIZE : 0, out pkLen, out algID);
publicKey = new Byte[pkLen + CAPI_HEADER_SIZE];
var idx = 0;
if (hasHeader)
{
// Just copy from blob
publicKey.BlockCopyFrom(ref idx, blob, 0, publicKey.Length);
idx = 4;
if (signingAlgorithm.HasValue)
{
actualSigningAlgorithm = signingAlgorithm.Value;
publicKey.WriteInt32LEToBytes(ref idx, (Int32)actualSigningAlgorithm);
}
else
{
actualSigningAlgorithm = (AssemblyHashAlgorithm)publicKey.ReadInt32LEFromBytes(ref idx);
}
}
else
{
// Write public key, including header
// Write header explicitly. ALG-ID, followed by AssemblyHashAlgorithmID, followed by the size of the PK
actualSigningAlgorithm = signingAlgorithm ?? AssemblyHashAlgorithm.SHA1;// Defaults to SHA1
publicKey
.WriteInt32LEToBytes(ref idx, algID)
.WriteInt32LEToBytes(ref idx, (Int32)actualSigningAlgorithm)
.WriteInt32LEToBytes(ref idx, pkLen)
.BlockCopyFrom(ref idx, blob, 0, pkLen);
}
// Mark PK actually being PK
publicKey[CAPI_HEADER_SIZE] = PUBLIC_KEY;
// Set public key algorithm to RSA1
idx = 20;
publicKey.WriteUInt32LEToBytes(ref idx, RSA1);
return(retVal);
}
