void AES_ige_encrypt(const unsigned char *in, unsigned char *out,
					 const unsigned long length, const AES_KEY *key,
					 unsigned char *ivec, const int enc)
	{
	unsigned long n;
	unsigned long len = length;
	unsigned char tmp[AES_BLOCK_SIZE];
	unsigned char tmp2[AES_BLOCK_SIZE];
	unsigned char prev[AES_BLOCK_SIZE];
	const unsigned char *iv = ivec;
	const unsigned char *iv2 = ivec + AES_BLOCK_SIZE;

	OPENSSL_assert(in && out && key && ivec);
	OPENSSL_assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc));
	OPENSSL_assert((length%AES_BLOCK_SIZE) == 0);

	if (AES_ENCRYPT == enc)
		{
		/* XXX: Do a separate case for when in != out (strictly should
		   check for overlap, too) */
		while (len >= AES_BLOCK_SIZE)
			{
			/*			hexdump(stdout, "in", in, AES_BLOCK_SIZE); */
			/*			hexdump(stdout, "iv", iv, AES_BLOCK_SIZE); */
			for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
				out[n] = in[n] ^ iv[n];
			/*			hexdump(stdout, "in ^ iv", out, AES_BLOCK_SIZE); */
			AES_encrypt(out, out, key);
			/*			hexdump(stdout,"enc", out, AES_BLOCK_SIZE); */
			/*			hexdump(stdout,"iv2", iv2, AES_BLOCK_SIZE); */
			for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
				out[n] ^= iv2[n];
			/*			hexdump(stdout,"out", out, AES_BLOCK_SIZE); */
			iv = out;
			memcpy(prev, in, AES_BLOCK_SIZE);
			iv2 = prev;
			len -= AES_BLOCK_SIZE;
			in += AES_BLOCK_SIZE;
			out += AES_BLOCK_SIZE;
			}
		memcpy(ivec, iv, AES_BLOCK_SIZE);
		memcpy(ivec + AES_BLOCK_SIZE, iv2, AES_BLOCK_SIZE);
		}
	else
		{
		while (len >= AES_BLOCK_SIZE)
			{
			memcpy(tmp, in, AES_BLOCK_SIZE);
			memcpy(tmp2, in, AES_BLOCK_SIZE);
			/*			hexdump(stdout, "in", in, AES_BLOCK_SIZE); */
			/*			hexdump(stdout, "iv2", iv2, AES_BLOCK_SIZE); */
			for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
				tmp[n] ^= iv2[n];
			/*			hexdump(stdout, "in ^ iv2", tmp, AES_BLOCK_SIZE); */
			AES_decrypt(tmp, out, key);
			/*			hexdump(stdout, "dec", out, AES_BLOCK_SIZE); */
			/*			hexdump(stdout, "iv", ivec, AES_BLOCK_SIZE); */
			for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
				out[n] ^= ivec[n];
			/*			hexdump(stdout, "out", out, AES_BLOCK_SIZE); */
			memcpy(ivec, tmp2, AES_BLOCK_SIZE);
			iv2 = out;
			len -= AES_BLOCK_SIZE;
			in += AES_BLOCK_SIZE;
			out += AES_BLOCK_SIZE;
			}
		memcpy(ivec + AES_BLOCK_SIZE, iv2, AES_BLOCK_SIZE);
		}
	}