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authorLinus Torvalds <torvalds@linux-foundation.org>2018-12-27 13:53:32 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-12-27 13:53:32 -0800
commitb71acb0e372160167bf6d5500b88b30b52ccef6e (patch)
tree218e4b2752336ae38ffed12b67e89ed7995db931 /lib
parente0c38a4d1f196a4b17d2eba36afff8f656a4f1de (diff)
parentc79b411eaa7257204f89c30651c45cea22278769 (diff)
downloadlinux-stericsson-b71acb0e372160167bf6d5500b88b30b52ccef6e.tar.gz
Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto updates from Herbert Xu: "API: - Add 1472-byte test to tcrypt for IPsec - Reintroduced crypto stats interface with numerous changes - Support incremental algorithm dumps Algorithms: - Add xchacha12/20 - Add nhpoly1305 - Add adiantum - Add streebog hash - Mark cts(cbc(aes)) as FIPS allowed Drivers: - Improve performance of arm64/chacha20 - Improve performance of x86/chacha20 - Add NEON-accelerated nhpoly1305 - Add SSE2 accelerated nhpoly1305 - Add AVX2 accelerated nhpoly1305 - Add support for 192/256-bit keys in gcmaes AVX - Add SG support in gcmaes AVX - ESN for inline IPsec tx in chcr - Add support for CryptoCell 703 in ccree - Add support for CryptoCell 713 in ccree - Add SM4 support in ccree - Add SM3 support in ccree - Add support for chacha20 in caam/qi2 - Add support for chacha20 + poly1305 in caam/jr - Add support for chacha20 + poly1305 in caam/qi2 - Add AEAD cipher support in cavium/nitrox" * 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (130 commits) crypto: skcipher - remove remnants of internal IV generators crypto: cavium/nitrox - Fix build with !CONFIG_DEBUG_FS crypto: salsa20-generic - don't unnecessarily use atomic walk crypto: skcipher - add might_sleep() to skcipher_walk_virt() crypto: x86/chacha - avoid sleeping under kernel_fpu_begin() crypto: cavium/nitrox - Added AEAD cipher support crypto: mxc-scc - fix build warnings on ARM64 crypto: api - document missing stats member crypto: user - remove unused dump functions crypto: chelsio - Fix wrong error counter increments crypto: chelsio - Reset counters on cxgb4 Detach crypto: chelsio - Handle PCI shutdown event crypto: chelsio - cleanup:send addr as value in function argument crypto: chelsio - Use same value for both channel in single WR crypto: chelsio - Swap location of AAD and IV sent in WR crypto: chelsio - remove set but not used variable 'kctx_len' crypto: ux500 - Use proper enum in hash_set_dma_transfer crypto: ux500 - Use proper enum in cryp_set_dma_transfer crypto: aesni - Add scatter/gather avx stubs, and use them in C crypto: aesni - Introduce partial block macro ..
Diffstat (limited to 'lib')
-rw-r--r--lib/Makefile2
-rw-r--r--lib/chacha.c (renamed from lib/chacha20.c)59
2 files changed, 52 insertions, 9 deletions
diff --git a/lib/Makefile b/lib/Makefile
index f5262d30bfe6..e1b59da71418 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -20,7 +20,7 @@ KCOV_INSTRUMENT_dynamic_debug.o := n
lib-y := ctype.o string.o vsprintf.o cmdline.o \
rbtree.o radix-tree.o timerqueue.o xarray.o \
idr.o int_sqrt.o extable.o \
- sha1.o chacha20.o irq_regs.o argv_split.o \
+ sha1.o chacha.o irq_regs.o argv_split.o \
flex_proportions.o ratelimit.o show_mem.o \
is_single_threaded.o plist.o decompress.o kobject_uevent.o \
earlycpio.o seq_buf.o siphash.o dec_and_lock.o \
diff --git a/lib/chacha20.c b/lib/chacha.c
index d907fec6a9ed..a46d2832dbab 100644
--- a/lib/chacha20.c
+++ b/lib/chacha.c
@@ -1,5 +1,5 @@
/*
- * ChaCha20 256-bit cipher algorithm, RFC7539
+ * The "hash function" used as the core of the ChaCha stream cipher (RFC7539)
*
* Copyright (C) 2015 Martin Willi
*
@@ -14,17 +14,16 @@
#include <linux/bitops.h>
#include <linux/cryptohash.h>
#include <asm/unaligned.h>
-#include <crypto/chacha20.h>
+#include <crypto/chacha.h>
-void chacha20_block(u32 *state, u8 *stream)
+static void chacha_permute(u32 *x, int nrounds)
{
- u32 x[16];
int i;
- for (i = 0; i < ARRAY_SIZE(x); i++)
- x[i] = state[i];
+ /* whitelist the allowed round counts */
+ WARN_ON_ONCE(nrounds != 20 && nrounds != 12);
- for (i = 0; i < 20; i += 2) {
+ for (i = 0; i < nrounds; i += 2) {
x[0] += x[4]; x[12] = rol32(x[12] ^ x[0], 16);
x[1] += x[5]; x[13] = rol32(x[13] ^ x[1], 16);
x[2] += x[6]; x[14] = rol32(x[14] ^ x[2], 16);
@@ -65,10 +64,54 @@ void chacha20_block(u32 *state, u8 *stream)
x[8] += x[13]; x[7] = rol32(x[7] ^ x[8], 7);
x[9] += x[14]; x[4] = rol32(x[4] ^ x[9], 7);
}
+}
+
+/**
+ * chacha_block - generate one keystream block and increment block counter
+ * @state: input state matrix (16 32-bit words)
+ * @stream: output keystream block (64 bytes)
+ * @nrounds: number of rounds (20 or 12; 20 is recommended)
+ *
+ * This is the ChaCha core, a function from 64-byte strings to 64-byte strings.
+ * The caller has already converted the endianness of the input. This function
+ * also handles incrementing the block counter in the input matrix.
+ */
+void chacha_block(u32 *state, u8 *stream, int nrounds)
+{
+ u32 x[16];
+ int i;
+
+ memcpy(x, state, 64);
+
+ chacha_permute(x, nrounds);
for (i = 0; i < ARRAY_SIZE(x); i++)
put_unaligned_le32(x[i] + state[i], &stream[i * sizeof(u32)]);
state[12]++;
}
-EXPORT_SYMBOL(chacha20_block);
+EXPORT_SYMBOL(chacha_block);
+
+/**
+ * hchacha_block - abbreviated ChaCha core, for XChaCha
+ * @in: input state matrix (16 32-bit words)
+ * @out: output (8 32-bit words)
+ * @nrounds: number of rounds (20 or 12; 20 is recommended)
+ *
+ * HChaCha is the ChaCha equivalent of HSalsa and is an intermediate step
+ * towards XChaCha (see https://cr.yp.to/snuffle/xsalsa-20081128.pdf). HChaCha
+ * skips the final addition of the initial state, and outputs only certain words
+ * of the state. It should not be used for streaming directly.
+ */
+void hchacha_block(const u32 *in, u32 *out, int nrounds)
+{
+ u32 x[16];
+
+ memcpy(x, in, 64);
+
+ chacha_permute(x, nrounds);
+
+ memcpy(&out[0], &x[0], 16);
+ memcpy(&out[4], &x[12], 16);
+}
+EXPORT_SYMBOL(hchacha_block);