Ejemplo n.º 1
0
/* Populates private/public key pair - caller code allocates memory
* Parameters:
*   Return: sgx_status_t  - SGX_SUCCESS or failure as defined sgx_error.h
*   Inputs: sgx_ecc_state_handle_t ecc_handle - Handle to ECC crypto system
*   Outputs: sgx_ec256_private_t *p_private - Pointer to the private key
*            sgx_ec256_public_t *p_public - Pointer to the public key  */
sgx_status_t sgx_ecc256_create_key_pair(sgx_ec256_private_t *p_private,
    sgx_ec256_public_t *p_public,
    sgx_ecc_state_handle_t ecc_handle)
{
    if ((ecc_handle == NULL) || (p_private == NULL) || (p_public == NULL))
    {
        return SGX_ERROR_INVALID_PARAMETER;
    }

    IppsBigNumState*    dh_priv_BN = NULL;
    IppsECCPPointState* point_pub = NULL;
    IppsBigNumState*    pub_gx = NULL;
    IppsBigNumState*    pub_gy = NULL;
    IppStatus           ipp_ret = ippStsNoErr;
    int                 ecPointSize = 0;
    IppsECCPState* p_ecc_state = (IppsECCPState*)ecc_handle;

    do
    {
        //init eccp point
        ipp_ret = ippsECCPPointGetSize(256, &ecPointSize);
        ERROR_BREAK(ipp_ret);
        point_pub = (IppsECCPPointState*)(malloc(ecPointSize));
        if (!point_pub)
        {
            ipp_ret = ippStsNoMemErr;
            break;
        }
        ipp_ret = ippsECCPPointInit(256, point_pub);
        ERROR_BREAK(ipp_ret);

        ipp_ret = sgx_ipp_newBN(NULL, SGX_ECP256_KEY_SIZE, &dh_priv_BN);
        ERROR_BREAK(ipp_ret);
        // Use the true random number (DRNG)
        // Notice that IPP ensures the private key generated is non-zero
        ipp_ret = ippsECCPGenKeyPair(dh_priv_BN, point_pub, p_ecc_state, (IppBitSupplier)sgx_ipp_DRNGen, NULL);
        ERROR_BREAK(ipp_ret);

        //convert point_result to oct string
        ipp_ret = sgx_ipp_newBN(NULL, SGX_ECP256_KEY_SIZE, &pub_gx);
        ERROR_BREAK(ipp_ret);
        ipp_ret = sgx_ipp_newBN(NULL, SGX_ECP256_KEY_SIZE, &pub_gy);
        ERROR_BREAK(ipp_ret);
        ipp_ret = ippsECCPGetPoint(pub_gx, pub_gy, point_pub, p_ecc_state);
        ERROR_BREAK(ipp_ret);

        IppsBigNumSGN sgn = IppsBigNumPOS;
        Ipp32u *pdata = NULL;
        // ippsRef_BN is in bits not bytes (versus old ippsGet_BN)
        int length = 0;
        ipp_ret = ippsRef_BN(&sgn, &length, &pdata, pub_gx);
        ERROR_BREAK(ipp_ret);
        memset(p_public->gx, 0, sizeof(p_public->gx));
        ipp_ret = check_copy_size(sizeof(p_public->gx), ROUND_TO(length, 8) / 8);
        ERROR_BREAK(ipp_ret);
        memcpy(p_public->gx, pdata, ROUND_TO(length, 8) / 8);
        ipp_ret = ippsRef_BN(&sgn, &length, &pdata, pub_gy);
        ERROR_BREAK(ipp_ret);
        memset(p_public->gy, 0, sizeof(p_public->gy));
        ipp_ret = check_copy_size(sizeof(p_public->gy), ROUND_TO(length, 8) / 8);
        ERROR_BREAK(ipp_ret);
        memcpy(p_public->gy, pdata, ROUND_TO(length, 8) / 8);
        ipp_ret = ippsRef_BN(&sgn, &length, &pdata, dh_priv_BN);
        ERROR_BREAK(ipp_ret);
        memset(p_private->r, 0, sizeof(p_private->r));
        ipp_ret = check_copy_size(sizeof(p_private->r), ROUND_TO(length, 8) / 8);
        ERROR_BREAK(ipp_ret);
        memcpy(p_private->r, pdata, ROUND_TO(length, 8) / 8);
    } while (0);

    //Clear temp buffer before free.
    if (point_pub) memset_s(point_pub, ecPointSize, 0, ecPointSize);
    SAFE_FREE(point_pub);
    sgx_ipp_secure_free_BN(pub_gx, SGX_ECP256_KEY_SIZE);
    sgx_ipp_secure_free_BN(pub_gy, SGX_ECP256_KEY_SIZE);
    sgx_ipp_secure_free_BN(dh_priv_BN, SGX_ECP256_KEY_SIZE);

    switch (ipp_ret)
    {
    case ippStsNoErr: return SGX_SUCCESS;
    case ippStsNoMemErr:
    case ippStsMemAllocErr: return SGX_ERROR_OUT_OF_MEMORY;
    case ippStsNullPtrErr:
    case ippStsLengthErr:
    case ippStsOutOfRangeErr:
    case ippStsSizeErr:
    case ippStsBadArgErr: return SGX_ERROR_INVALID_PARAMETER;
    default: return SGX_ERROR_UNEXPECTED;
    }
}
Ejemplo n.º 2
0
/* Computes DH shared key based on private B key (local) and remote public Ga Key
* Parameters:
*   Return: sgx_status_t - SGX_SUCCESS or failure as defined sgx_error.h
*   Inputs: sgx_ecc_state_handle_t ecc_handle - Handle to ECC crypto system
*           sgx_ec256_private_t *p_private_b - Pointer to the local private key - LITTLE ENDIAN
*           sgx_ec256_public_t *p_public_ga - Pointer to the remote public key - LITTLE ENDIAN
*   Output: sgx_ec256_dh_shared_t *p_shared_key - Pointer to the shared DH key - LITTLE ENDIAN
x-coordinate of (privKeyB - pubKeyA) */
sgx_status_t sgx_ecc256_compute_shared_dhkey(sgx_ec256_private_t *p_private_b,
                                             sgx_ec256_public_t *p_public_ga,
                                             sgx_ec256_dh_shared_t *p_shared_key,
                                             sgx_ecc_state_handle_t ecc_handle)
{
    if ((ecc_handle == NULL) || (p_private_b == NULL) || (p_public_ga == NULL) || (p_shared_key == NULL))
    {
        return SGX_ERROR_INVALID_PARAMETER;
    }

    IppsBigNumState*    BN_dh_privB = NULL;
    IppsBigNumState*    BN_dh_share = NULL;
    IppsBigNumState*    pubA_gx = NULL;
    IppsBigNumState*    pubA_gy = NULL;
    IppsECCPPointState* point_pubA = NULL;
    IppStatus           ipp_ret = ippStsNoErr;
    int                 ecPointSize = 0;
    IppsECCPState* p_ecc_state = (IppsECCPState*)ecc_handle;
    IppECResult ipp_result = ippECValid;

    do
    {
        ipp_ret = sgx_ipp_newBN((Ipp32u*)p_private_b->r, sizeof(sgx_ec256_private_t), &BN_dh_privB);
        ERROR_BREAK(ipp_ret);
        ipp_ret = sgx_ipp_newBN((uint32_t*)p_public_ga->gx, sizeof(p_public_ga->gx), &pubA_gx);
        ERROR_BREAK(ipp_ret);
        ipp_ret = sgx_ipp_newBN((uint32_t*)p_public_ga->gy, sizeof(p_public_ga->gy), &pubA_gy);
        ERROR_BREAK(ipp_ret);
        ipp_ret = ippsECCPPointGetSize(256, &ecPointSize);
        ERROR_BREAK(ipp_ret);
        point_pubA = (IppsECCPPointState*)(malloc(ecPointSize));
        if (!point_pubA)
        {
            ipp_ret = ippStsNoMemErr;
            break;
        }
        ipp_ret = ippsECCPPointInit(256, point_pubA);
        ERROR_BREAK(ipp_ret);
        ipp_ret = ippsECCPSetPoint(pubA_gx, pubA_gy, point_pubA, p_ecc_state);
        ERROR_BREAK(ipp_ret);

        // Check to see if the point is a valid point on the Elliptic curve and is not infinity
        ipp_ret = ippsECCPCheckPoint(point_pubA, &ipp_result, p_ecc_state);
        if (ipp_result != ippECValid)
        {
            break;
        }
        ERROR_BREAK(ipp_ret);

        ipp_ret = sgx_ipp_newBN(NULL, sizeof(sgx_ec256_dh_shared_t), &BN_dh_share);
        ERROR_BREAK(ipp_ret);
        /* This API generates shareA = x-coordinate of (privKeyB*pubKeyA) */
        ipp_ret = ippsECCPSharedSecretDH(BN_dh_privB, point_pubA, BN_dh_share, p_ecc_state);
        ERROR_BREAK(ipp_ret);
        IppsBigNumSGN sgn = IppsBigNumPOS;
        int length = 0;
        Ipp32u * pdata = NULL;
        ipp_ret = ippsRef_BN(&sgn, &length, &pdata, BN_dh_share);
        ERROR_BREAK(ipp_ret);
        memset(p_shared_key->s, 0, sizeof(p_shared_key->s));
        ipp_ret = check_copy_size(sizeof(p_shared_key->s), ROUND_TO(length, 8) / 8);
        ERROR_BREAK(ipp_ret);
        memcpy(p_shared_key->s, pdata, ROUND_TO(length, 8) / 8);
    } while (0);

    // Clear temp buffer before free.
    if (point_pubA) memset_s(point_pubA, ecPointSize, 0, ecPointSize);
    SAFE_FREE(point_pubA);
    sgx_ipp_secure_free_BN(pubA_gx, sizeof(p_public_ga->gx));
    sgx_ipp_secure_free_BN(pubA_gy, sizeof(p_public_ga->gy));
    sgx_ipp_secure_free_BN(BN_dh_privB, sizeof(sgx_ec256_private_t));
    sgx_ipp_secure_free_BN(BN_dh_share, sizeof(sgx_ec256_dh_shared_t));


    if (ipp_result != ippECValid)
    {
        return SGX_ERROR_INVALID_PARAMETER;
    }
    switch (ipp_ret)
    {
    case ippStsNoErr: return SGX_SUCCESS;
    case ippStsNoMemErr:
    case ippStsMemAllocErr: return SGX_ERROR_OUT_OF_MEMORY;
    case ippStsNullPtrErr:
    case ippStsLengthErr:
    case ippStsOutOfRangeErr:
    case ippStsSizeErr:
    case ippStsBadArgErr: return SGX_ERROR_INVALID_PARAMETER;
    default: return SGX_ERROR_UNEXPECTED;
    }
}
Ejemplo n.º 3
0
/* Computes signature for data based on private key
* Parameters:
*   Return: sample_status_t - SAMPLE_SUCCESS, SAMPLE_SUCCESS on success, error code otherwise.
*   Inputs: sample_ecc_state_handle_t ecc_handle - Handle to ECC crypto system
*           sample_ec256_private_t *p_private - Pointer to the private key - LITTLE ENDIAN
*           sample_uint8_t *p_data - Pointer to the data to be signed
*           uint32_t data_size - Size of the data to be signed
*   Output: sample_ec256_signature_t *p_signature - Pointer to the signature - LITTLE ENDIAN  */
sample_status_t sample_ecdsa_sign(const uint8_t *p_data,
                            uint32_t data_size,
                            sample_ec256_private_t *p_private,
                            sample_ec256_signature_t *p_signature,
                            sample_ecc_state_handle_t ecc_handle)
{
    if ((ecc_handle == NULL) || (p_private == NULL) || (p_signature == NULL) || (p_data == NULL) || (data_size < 1))
    {
        return SAMPLE_ERROR_INVALID_PARAMETER;
    }

    IppStatus ipp_ret = ippStsNoErr;
    IppsECCPState* p_ecc_state = (IppsECCPState*)ecc_handle;
    IppsBigNumState* p_ecp_order = NULL;
    IppsBigNumState* p_hash_bn = NULL;
    IppsBigNumState* p_msg_bn = NULL;
    IppsBigNumState* p_eph_priv_bn = NULL;
    IppsECCPPointState* p_eph_pub = NULL;
    IppsBigNumState* p_reg_priv_bn = NULL;
    IppsBigNumState* p_signx_bn = NULL;
    IppsBigNumState* p_signy_bn = NULL;
    Ipp32u *p_sigx = NULL;
    Ipp32u *p_sigy = NULL;
    int ecp_size = 0;
    const int order_size = sizeof(sample_nistp256_r);
    uint32_t hash[8] = {0};

    do
    {

        ipp_ret = sgx_ipp_newBN(sample_nistp256_r, order_size, &p_ecp_order);
        ERROR_BREAK(ipp_ret);

        // Prepare the message used to sign.
        ipp_ret = ippsHashMessage(p_data, data_size, (Ipp8u*)hash, IPP_ALG_HASH_SHA256);
        ERROR_BREAK(ipp_ret);
        /* Byte swap in creation of Big Number from SHA256 hash output */
        ipp_ret = sgx_ipp_newBN(NULL, sizeof(hash), &p_hash_bn);
        ERROR_BREAK(ipp_ret);
        ipp_ret = ippsSetOctString_BN((Ipp8u*)hash, sizeof(hash), p_hash_bn);
        ERROR_BREAK(ipp_ret);

        ipp_ret = sgx_ipp_newBN(NULL, order_size, &p_msg_bn);
        ERROR_BREAK(ipp_ret);
        ipp_ret = ippsMod_BN(p_hash_bn, p_ecp_order, p_msg_bn);
        ERROR_BREAK(ipp_ret);

        // Get ephemeral key pair.
        ipp_ret = sgx_ipp_newBN(NULL, order_size, &p_eph_priv_bn);
        ERROR_BREAK(ipp_ret);
        //init eccp point
        ipp_ret = ippsECCPPointGetSize(256, &ecp_size);
        ERROR_BREAK(ipp_ret);
        p_eph_pub = (IppsECCPPointState*)(malloc(ecp_size));
        if(!p_eph_pub)
        {
            ipp_ret = ippStsNoMemErr;
            break;
        }
        ipp_ret = ippsECCPPointInit(256, p_eph_pub);
        ERROR_BREAK(ipp_ret);
        // generate ephemeral key pair for signing operation
        ipp_ret = ippsECCPGenKeyPair(p_eph_priv_bn, p_eph_pub, p_ecc_state,
            (IppBitSupplier)sample_ipp_DRNGen, NULL);
        ERROR_BREAK(ipp_ret);
        ipp_ret = ippsECCPSetKeyPair(p_eph_priv_bn, p_eph_pub, ippFalse, p_ecc_state);
        ERROR_BREAK(ipp_ret);

        // Set the regular private key.
        ipp_ret = sgx_ipp_newBN((uint32_t *)p_private->r, sizeof(p_private->r),
            &p_reg_priv_bn);
        ERROR_BREAK(ipp_ret);
        ipp_ret = sgx_ipp_newBN(NULL, order_size, &p_signx_bn);
        ERROR_BREAK(ipp_ret);
        ipp_ret = sgx_ipp_newBN(NULL, order_size, &p_signy_bn);
        ERROR_BREAK(ipp_ret);

        // Sign the message.
        ipp_ret = ippsECCPSignDSA(p_msg_bn, p_reg_priv_bn, p_signx_bn, p_signy_bn,
            p_ecc_state);
        ERROR_BREAK(ipp_ret);

        IppsBigNumSGN sign;
        int length;
        ipp_ret = ippsRef_BN(&sign, &length,(Ipp32u**) &p_sigx, p_signx_bn);
        ERROR_BREAK(ipp_ret);
        memset(p_signature->x, 0, sizeof(p_signature->x));
        ipp_ret = check_copy_size(sizeof(p_signature->x), ROUND_TO(length, 8)/8);
        ERROR_BREAK(ipp_ret);
        memcpy(p_signature->x, p_sigx, ROUND_TO(length, 8)/8);
        memset_s(p_sigx, sizeof(p_signature->x), 0, ROUND_TO(length, 8)/8);
        ipp_ret = ippsRef_BN(&sign, &length,(Ipp32u**) &p_sigy, p_signy_bn);
        ERROR_BREAK(ipp_ret);
        memset(p_signature->y, 0, sizeof(p_signature->y));
        ipp_ret = check_copy_size(sizeof(p_signature->y), ROUND_TO(length, 8)/8);
        ERROR_BREAK(ipp_ret);
        memcpy(p_signature->y, p_sigy, ROUND_TO(length, 8)/8);
        memset_s(p_sigy, sizeof(p_signature->y), 0, ROUND_TO(length, 8)/8);        

    }while(0);

    // Clear buffer before free.
    if(p_eph_pub)
        memset_s(p_eph_pub, ecp_size, 0, ecp_size);
    SAFE_FREE(p_eph_pub);
    sample_ipp_secure_free_BN(p_ecp_order, order_size);
    sample_ipp_secure_free_BN(p_hash_bn, sizeof(hash));
    sample_ipp_secure_free_BN(p_msg_bn, order_size);
    sample_ipp_secure_free_BN(p_eph_priv_bn, order_size);
    sample_ipp_secure_free_BN(p_reg_priv_bn, sizeof(p_private->r));
    sample_ipp_secure_free_BN(p_signx_bn, order_size);
    sample_ipp_secure_free_BN(p_signy_bn, order_size);

    switch (ipp_ret)
    {
    case ippStsNoErr: return SAMPLE_SUCCESS;
    case ippStsNoMemErr:
    case ippStsMemAllocErr: return SAMPLE_ERROR_OUT_OF_MEMORY;
    case ippStsNullPtrErr:
    case ippStsLengthErr:
    case ippStsOutOfRangeErr:
    case ippStsSizeErr:
    case ippStsBadArgErr: return SAMPLE_ERROR_INVALID_PARAMETER;
    default: return SAMPLE_ERROR_UNEXPECTED;
    }
}