C++ (Cpp) px_cipher_encrypt Examples

Example #1

File: pgp-cfb.c Project: BioBD/Hypothetical_Indexes

/*
 * common code for both encrypt and decrypt.
 */
static int
cfb_process(PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst,
			mix_data_t mix_data)
{
	int			n;
	int			res;

	while (len > 0 && ctx->pos > 0)
	{
		n = ctx->block_size - ctx->pos;
		if (len < n)
			n = len;

		n = mix_data(ctx, data, n, dst);
		data += n;
		dst += n;
		len -= n;

		if (ctx->pos == ctx->block_size)
		{
			memcpy(ctx->fr, ctx->encbuf, ctx->block_size);
			ctx->pos = 0;
		}
	}

	while (len > 0)
	{
		px_cipher_encrypt(ctx->ciph, ctx->fr, ctx->block_size, ctx->fre);
		if (ctx->block_no < 5)
			ctx->block_no++;

		n = ctx->block_size;
		if (len < n)
			n = len;

		res = mix_data(ctx, data, n, dst);
		data += res;
		dst += res;
		len -= res;

		if (ctx->pos == ctx->block_size)
		{
			memcpy(ctx->fr, ctx->encbuf, ctx->block_size);
			ctx->pos = 0;
		}
	}
	return 0;
}

Example #2

File: px.c Project: Tao-Ma/postgres

static int
combo_encrypt(PX_Combo *cx, const uint8 *data, unsigned dlen,
			  uint8 *res, unsigned *rlen)
{
	int			err = 0;
	uint8	   *bbuf;
	unsigned	bs,
				bpos,
				i,
				pad;

	PX_Cipher  *c = cx->cipher;

	bbuf = NULL;
	bs = px_cipher_block_size(c);

	/* encrypt */
	if (bs > 1)
	{
		bbuf = px_alloc(bs * 4);
		bpos = dlen % bs;
		*rlen = dlen - bpos;
		memcpy(bbuf, data + *rlen, bpos);

		/* encrypt full-block data */
		if (*rlen)
		{
			err = px_cipher_encrypt(c, data, *rlen, res);
			if (err)
				goto out;
		}

		/* bbuf has now bpos bytes of stuff */
		if (cx->padding)
		{
			pad = bs - (bpos % bs);
			for (i = 0; i < pad; i++)
				bbuf[bpos++] = pad;
		}
		else if (bpos % bs)
		{
			/* ERROR? */
			pad = bs - (bpos % bs);
			for (i = 0; i < pad; i++)
				bbuf[bpos++] = 0;
		}

		/* encrypt the rest - pad */
		if (bpos)
		{
			err = px_cipher_encrypt(c, bbuf, bpos, res + *rlen);
			*rlen += bpos;
		}
	}
	else
	{
		/* stream cipher/mode - no pad needed */
		err = px_cipher_encrypt(c, data, dlen, res);
		if (err)
			goto out;
		*rlen = dlen;
	}
out:
	if (bbuf)
		px_free(bbuf);

	return err;
}