示例#1
0
 void append(Blob& blob, const byte* buf, uint32_t len)
 {
     if (len != 0) {
         assert(buf != 0);
         Blob::size_type size = blob.size();
         if (blob.capacity() - size < len) {
             blob.reserve(size + 65536);
         }
         blob.resize(size + len);
         std::memcpy(&blob[size], buf, len);
     }
 } // append
示例#2
0
文件: ECIES.cpp 项目: BobWay/rippled
Blob encryptECIES (const openssl::ec_key& secretKey, const openssl::ec_key& publicKey, Blob const& plaintext)
{

    ECIES_ENC_IV_TYPE iv;
    random_fill (iv.begin (), ECIES_ENC_BLK_SIZE);

    ECIES_ENC_KEY_TYPE secret;
    ECIES_HMAC_KEY_TYPE hmacKey;

    getECIESSecret (secretKey, publicKey, secret, hmacKey);
    ECIES_HMAC_TYPE hmac = makeHMAC (hmacKey, plaintext);
    hmacKey.zero ();

    EVP_CIPHER_CTX ctx;
    EVP_CIPHER_CTX_init (&ctx);

    if (EVP_EncryptInit_ex (&ctx, ECIES_ENC_ALGO, nullptr, secret.begin (), iv.begin ()) != 1)
    {
        EVP_CIPHER_CTX_cleanup (&ctx);
        secret.zero ();
        throw std::runtime_error ("init cipher ctx");
    }

    secret.zero ();

    Blob out (plaintext.size () + ECIES_HMAC_SIZE + ECIES_ENC_KEY_SIZE + ECIES_ENC_BLK_SIZE, 0);
    int len = 0, bytesWritten;

    // output IV
    memcpy (& (out.front ()), iv.begin (), ECIES_ENC_BLK_SIZE);
    len = ECIES_ENC_BLK_SIZE;

    // Encrypt/output HMAC
    bytesWritten = out.capacity () - len;
    assert (bytesWritten > 0);

    if (EVP_EncryptUpdate (&ctx, & (out.front ()) + len, &bytesWritten, hmac.begin (), ECIES_HMAC_SIZE) < 0)
    {
        EVP_CIPHER_CTX_cleanup (&ctx);
        throw std::runtime_error ("");
    }

    len += bytesWritten;

    // encrypt/output plaintext
    bytesWritten = out.capacity () - len;
    assert (bytesWritten > 0);

    if (EVP_EncryptUpdate (&ctx, & (out.front ()) + len, &bytesWritten, & (plaintext.front ()), plaintext.size ()) < 0)
    {
        EVP_CIPHER_CTX_cleanup (&ctx);
        throw std::runtime_error ("");
    }

    len += bytesWritten;

    // finalize
    bytesWritten = out.capacity () - len;

    if (EVP_EncryptFinal_ex (&ctx, & (out.front ()) + len, &bytesWritten) < 0)
    {
        EVP_CIPHER_CTX_cleanup (&ctx);
        throw std::runtime_error ("encryption error");
    }

    len += bytesWritten;

    // Output contains: IV, encrypted HMAC, encrypted data, encrypted padding
    assert (len <= (plaintext.size () + ECIES_HMAC_SIZE + (2 * ECIES_ENC_BLK_SIZE)));
    assert (len >= (plaintext.size () + ECIES_HMAC_SIZE + ECIES_ENC_BLK_SIZE)); // IV, HMAC, data
    out.resize (len);
    EVP_CIPHER_CTX_cleanup (&ctx);
    return out;
}