C++ (Cpp) twofish_dec_blk Examples

Example #1

File: twofish_avx2_glue.c Project: 18712886438/android_kernel_motorola_quark

static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
{
	const unsigned int bsize = TF_BLOCK_SIZE;
	struct crypt_priv *ctx = priv;
	int i;

	ctx->fpu_enabled = twofish_fpu_begin(ctx->fpu_enabled, nbytes);

	while (nbytes >= TF_AVX2_PARALLEL_BLOCKS * bsize) {
		twofish_ecb_dec_16way(ctx->ctx, srcdst, srcdst);
		srcdst += bsize * TF_AVX2_PARALLEL_BLOCKS;
		nbytes -= bsize * TF_AVX2_PARALLEL_BLOCKS;
	}

	while (nbytes >= 8 * bsize) {
		twofish_ecb_dec_8way(ctx->ctx, srcdst, srcdst);
		srcdst += bsize * 8;
		nbytes -= bsize * 8;
	}

	while (nbytes >= 3 * bsize) {
		twofish_dec_blk_3way(ctx->ctx, srcdst, srcdst);
		srcdst += bsize * 3;
		nbytes -= bsize * 3;
	}

	for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
		twofish_dec_blk(ctx->ctx, srcdst, srcdst);
}

Example #2

File: twofish_glue_3way.c Project: ARMWorks/FA_2451_Linux_Kernel

static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
{
	const unsigned int bsize = TF_BLOCK_SIZE;
	struct twofish_ctx *ctx = priv;
	int i;

	if (nbytes == 3 * bsize) {
		twofish_dec_blk_3way(ctx, srcdst, srcdst);
		return;
	}

	for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
		twofish_dec_blk(ctx, srcdst, srcdst);
}

Example #3

File: twofish_avx_glue.c Project: AllenDou/linux

static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
{
	const unsigned int bsize = TF_BLOCK_SIZE;
	struct crypt_priv *ctx = priv;
	int i;

	ctx->fpu_enabled = twofish_fpu_begin(ctx->fpu_enabled, nbytes);

	if (nbytes == bsize * TWOFISH_PARALLEL_BLOCKS) {
		twofish_dec_blk_xway(ctx->ctx, srcdst, srcdst);
		return;
	}

	for (i = 0; i < nbytes / (bsize * 3); i++, srcdst += bsize * 3)
		twofish_dec_blk_3way(ctx->ctx, srcdst, srcdst);

	nbytes %= bsize * 3;

	for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
		twofish_dec_blk(ctx->ctx, srcdst, srcdst);
}

Example #4

File: twofish_glue.c Project: 10x-Amin/x10_Th_kernel

static void twofish_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
	twofish_dec_blk(tfm, dst, src);
}

Example #5

File: twofish_glue_3way.c Project: 08opt/linux

static unsigned int __cbc_decrypt(struct blkcipher_desc *desc,
				  struct blkcipher_walk *walk)
{
	struct twofish_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	unsigned int bsize = TF_BLOCK_SIZE;
	unsigned int nbytes = walk->nbytes;
	u128 *src = (u128 *)walk->src.virt.addr;
	u128 *dst = (u128 *)walk->dst.virt.addr;
	u128 ivs[3 - 1];
	u128 last_iv;

	/* Start of the last block. */
	src += nbytes / bsize - 1;
	dst += nbytes / bsize - 1;

	last_iv = *src;

	/* Process three block batch */
	if (nbytes >= bsize * 3) {
		do {
			nbytes -= bsize * (3 - 1);
			src -= 3 - 1;
			dst -= 3 - 1;

			ivs[0] = src[0];
			ivs[1] = src[1];

			twofish_dec_blk_3way(ctx, (u8 *)dst, (u8 *)src);

			u128_xor(dst + 1, dst + 1, ivs + 0);
			u128_xor(dst + 2, dst + 2, ivs + 1);

			nbytes -= bsize;
			if (nbytes < bsize)
				goto done;

			u128_xor(dst, dst, src - 1);
			src -= 1;
			dst -= 1;
		} while (nbytes >= bsize * 3);

		if (nbytes < bsize)
			goto done;
	}

	/* Handle leftovers */
	for (;;) {
		twofish_dec_blk(ctx, (u8 *)dst, (u8 *)src);

		nbytes -= bsize;
		if (nbytes < bsize)
			break;

		u128_xor(dst, dst, src - 1);
		src -= 1;
		dst -= 1;
	}

done:
	u128_xor(dst, dst, (u128 *)walk->iv);
	*(u128 *)walk->iv = last_iv;

	return nbytes;
}