I'm attempting to write a wrapper aroung the API defined for the
trusted platform module. The Design Principles specification from the
trusted computing group (http://www.trustedcomputinggroup.org/
resources/tpm_main_specification) states that when using the
TPM_ES_RSAESOAEP_SHA1_MGF1 encryption type, that " The OAEP encoding P
parameter MUST be the 4 character string “TCPA” ".
I use the following code when performing RSAES_OAEP encryption. How
can I modify it to set the padding parameter to "TCPA"?
std::vector<BYTE> EncryptDataUsingRSAES_OAEP_SHA( std::vector<BYTE>
vDataToEncrypt,
std::vector<BYTE>
vTpmRsaPubKeyModulus)
{
std::vector<BYTE> cipher;
CryptoPP::AutoSeededRandomPool rng;
CryptoPP::Integer modulus(&vTpmRsaPubKeyModulus[0],
vTpmRsaPubKeyModulus.size());
CryptoPP::RSA::PublicKey publicKey;
publicKey.SetPublicExponent(65537); // TPM uses 65537 as public
exponent
publicKey.SetModulus(modulus);
CryptoPP::RSAES_OAEP_SHA_Encryptor e(publicKey);
CryptoPP::SecByteBlock
sbbCipherText(e.CiphertextLength(vDataToEncrypt.size()));
e.Encrypt( rng, &vDataToEncrypt[0], vDataToEncrypt.size(),
sbbCipherText.begin() );
cipher.assign(sbbCipherText.BytePtr(), sbbCipherText.BytePtr() +
sbbCipherText.size());
return cipher;
}
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