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// RsaPrivateKey.cpp
#include "Globals.h"
#include "RsaPrivateKey.h"
#include <polarssl/pk.h>
#include "CtrDrbgContext.h"
cRsaPrivateKey::cRsaPrivateKey(void)
{
rsa_init(&m_Rsa, RSA_PKCS_V15, 0);
m_CtrDrbg.Initialize("RSA", 3);
}
cRsaPrivateKey::cRsaPrivateKey(const cRsaPrivateKey & a_Other)
{
rsa_init(&m_Rsa, RSA_PKCS_V15, 0);
rsa_copy(&m_Rsa, &a_Other.m_Rsa);
m_CtrDrbg.Initialize("RSA", 3);
}
cRsaPrivateKey::~cRsaPrivateKey()
{
rsa_free(&m_Rsa);
}
bool cRsaPrivateKey::Generate(unsigned a_KeySizeBits)
{
int res = rsa_gen_key(&m_Rsa, ctr_drbg_random, m_CtrDrbg.GetInternal(), a_KeySizeBits, 65537);
if (res != 0)
{
LOG("RSA key generation failed: -0x%x", -res);
return false;
}
return true;
}
AString cRsaPrivateKey::GetPubKeyDER(void)
{
class cPubKey
{
public:
cPubKey(rsa_context * a_Rsa) :
m_IsValid(false)
{
pk_init(&m_Key);
if (pk_init_ctx(&m_Key, pk_info_from_type(POLARSSL_PK_RSA)) != 0)
{
ASSERT(!"Cannot init PrivKey context");
return;
}
if (rsa_copy(pk_rsa(m_Key), a_Rsa) != 0)
{
ASSERT(!"Cannot copy PrivKey to PK context");
return;
}
m_IsValid = true;
}
~cPubKey()
{
if (m_IsValid)
{
pk_free(&m_Key);
}
}
operator pk_context * (void) { return &m_Key; }
protected:
bool m_IsValid;
pk_context m_Key;
} PkCtx(&m_Rsa);
unsigned char buf[3000];
int res = pk_write_pubkey_der(PkCtx, buf, sizeof(buf));
if (res < 0)
{
return AString();
}
return AString(reinterpret_cast<const char *>(buf + sizeof(buf) - res), static_cast<size_t>(res));
}
int cRsaPrivateKey::Decrypt(const Byte * a_EncryptedData, size_t a_EncryptedLength, Byte * a_DecryptedData, size_t a_DecryptedMaxLength)
{
if (a_EncryptedLength < m_Rsa.len)
{
LOGD("%s: Invalid a_EncryptedLength: got %u, exp at least %u",
__FUNCTION__, static_cast<unsigned>(a_EncryptedLength), static_cast<unsigned>(m_Rsa.len)
);
ASSERT(!"Invalid a_DecryptedMaxLength!");
return -1;
}
if (a_DecryptedMaxLength < m_Rsa.len)
{
LOGD("%s: Invalid a_DecryptedMaxLength: got %u, exp at least %u",
__FUNCTION__, static_cast<unsigned>(a_EncryptedLength), static_cast<unsigned>(m_Rsa.len)
);
ASSERT(!"Invalid a_DecryptedMaxLength!");
return -1;
}
size_t DecryptedLength;
int res = rsa_pkcs1_decrypt(
&m_Rsa, ctr_drbg_random, m_CtrDrbg.GetInternal(), RSA_PRIVATE, &DecryptedLength,
a_EncryptedData, a_DecryptedData, a_DecryptedMaxLength
);
if (res != 0)
{
return -1;
}
return static_cast<int>(DecryptedLength);
}
int cRsaPrivateKey::Encrypt(const Byte * a_PlainData, size_t a_PlainLength, Byte * a_EncryptedData, size_t a_EncryptedMaxLength)
{
if (a_EncryptedMaxLength < m_Rsa.len)
{
LOGD("%s: Invalid a_EncryptedMaxLength: got %u, exp at least %u",
__FUNCTION__, static_cast<unsigned>(a_EncryptedMaxLength), static_cast<unsigned>(m_Rsa.len)
);
ASSERT(!"Invalid a_DecryptedMaxLength!");
return -1;
}
if (a_PlainLength < m_Rsa.len)
{
LOGD("%s: Invalid a_PlainLength: got %u, exp at least %u",
__FUNCTION__, static_cast<unsigned>(a_PlainLength), static_cast<unsigned>(m_Rsa.len)
);
ASSERT(!"Invalid a_PlainLength!");
return -1;
}
int res = rsa_pkcs1_encrypt(
&m_Rsa, ctr_drbg_random, m_CtrDrbg.GetInternal(), RSA_PRIVATE,
a_PlainLength, a_PlainData, a_EncryptedData
);
if (res != 0)
{
return -1;
}
return static_cast<int>(m_Rsa.len);
}
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