xref: /external/scrypt/patches/arm_neon.patch

diff --git a/lib/crypto/crypto_scrypt-neon-salsa208.h b/lib/crypto/crypto_scrypt-neon-salsa208.h
new file mode 100644
index 0000000..a3b1019
--- /dev/null
+++ b/lib/crypto/crypto_scrypt-neon-salsa208.h
@@ -0,0 +1,120 @@
+/*
+ * version 20110505
+ * D. J. Bernstein
+ * Public domain.
+ *
+ * Based on crypto_core/salsa208/armneon/core.c from SUPERCOP 20130419
+ */
+
+#define ROUNDS 8
+static void
+salsa20_8_intrinsic(void * input)
+{
+  int i;
+
+  const uint32x4_t abab = {-1,0,-1,0};
+
+  /*
+   * This is modified since we only have one argument. Usually you'd rearrange
+   * the constant, key, and input bytes, but we just have one linear array to
+   * rearrange which is a bit easier.
+   */
+
+  /*
+   * Change the input to be diagonals as if it's a 4x4 matrix of 32-bit values.
+   */
+  uint32x4_t x0x5x10x15;
+  uint32x4_t x12x1x6x11;
+  uint32x4_t x8x13x2x7;
+  uint32x4_t x4x9x14x3;
+
+  uint32x4_t x0x1x10x11;
+  uint32x4_t x12x13x6x7;
+  uint32x4_t x8x9x2x3;
+  uint32x4_t x4x5x14x15;
+
+  uint32x4_t x0x1x2x3;
+  uint32x4_t x4x5x6x7;
+  uint32x4_t x8x9x10x11;
+  uint32x4_t x12x13x14x15;
+
+  x0x1x2x3 = vld1q_u8((uint8_t *) input);
+  x4x5x6x7 = vld1q_u8(16 + (uint8_t *) input);
+  x8x9x10x11 = vld1q_u8(32 + (uint8_t *) input);
+  x12x13x14x15 = vld1q_u8(48 + (uint8_t *) input);
+
+  x0x1x10x11 = vcombine_u32(vget_low_u32(x0x1x2x3), vget_high_u32(x8x9x10x11));
+  x4x5x14x15 = vcombine_u32(vget_low_u32(x4x5x6x7), vget_high_u32(x12x13x14x15));
+  x8x9x2x3 = vcombine_u32(vget_low_u32(x8x9x10x11), vget_high_u32(x0x1x2x3));
+  x12x13x6x7 = vcombine_u32(vget_low_u32(x12x13x14x15), vget_high_u32(x4x5x6x7));
+
+  x0x5x10x15 = vbslq_u32(abab,x0x1x10x11,x4x5x14x15);
+  x8x13x2x7 = vbslq_u32(abab,x8x9x2x3,x12x13x6x7);
+  x4x9x14x3 = vbslq_u32(abab,x4x5x14x15,x8x9x2x3);
+  x12x1x6x11 = vbslq_u32(abab,x12x13x6x7,x0x1x10x11);
+
+  uint32x4_t start0 = x0x5x10x15;
+  uint32x4_t start1 = x12x1x6x11;
+  uint32x4_t start3 = x4x9x14x3;
+  uint32x4_t start2 = x8x13x2x7;
+
+  /* From here on this should be the same as the SUPERCOP version. */
+
+  uint32x4_t diag0 = start0;
+  uint32x4_t diag1 = start1;
+  uint32x4_t diag2 = start2;
+  uint32x4_t diag3 = start3;
+
+  uint32x4_t a0;
+  uint32x4_t a1;
+  uint32x4_t a2;
+  uint32x4_t a3;
+
+  for (i = ROUNDS;i > 0;i -= 2) {
+    a0 = diag1 + diag0;
+    diag3 ^= vsriq_n_u32(vshlq_n_u32(a0,7),a0,25);
+    a1 = diag0 + diag3;
+    diag2 ^= vsriq_n_u32(vshlq_n_u32(a1,9),a1,23);
+    a2 = diag3 + diag2;
+    diag1 ^= vsriq_n_u32(vshlq_n_u32(a2,13),a2,19);
+    a3 = diag2 + diag1;
+    diag0 ^= vsriq_n_u32(vshlq_n_u32(a3,18),a3,14);
+
+    diag3 = vextq_u32(diag3,diag3,3);
+    diag2 = vextq_u32(diag2,diag2,2);
+    diag1 = vextq_u32(diag1,diag1,1);
+
+    a0 = diag3 + diag0;
+    diag1 ^= vsriq_n_u32(vshlq_n_u32(a0,7),a0,25);
+    a1 = diag0 + diag1;
+    diag2 ^= vsriq_n_u32(vshlq_n_u32(a1,9),a1,23);
+    a2 = diag1 + diag2;
+    diag3 ^= vsriq_n_u32(vshlq_n_u32(a2,13),a2,19);
+    a3 = diag2 + diag3;
+    diag0 ^= vsriq_n_u32(vshlq_n_u32(a3,18),a3,14);
+
+    diag1 = vextq_u32(diag1,diag1,3);
+    diag2 = vextq_u32(diag2,diag2,2);
+    diag3 = vextq_u32(diag3,diag3,1);
+  }
+
+  x0x5x10x15 = diag0 + start0;
+  x12x1x6x11 = diag1 + start1;
+  x8x13x2x7 = diag2 + start2;
+  x4x9x14x3 = diag3 + start3;
+
+  x0x1x10x11 = vbslq_u32(abab,x0x5x10x15,x12x1x6x11);
+  x12x13x6x7 = vbslq_u32(abab,x12x1x6x11,x8x13x2x7);
+  x8x9x2x3 = vbslq_u32(abab,x8x13x2x7,x4x9x14x3);
+  x4x5x14x15 = vbslq_u32(abab,x4x9x14x3,x0x5x10x15);
+
+  x0x1x2x3 = vcombine_u32(vget_low_u32(x0x1x10x11),vget_high_u32(x8x9x2x3));
+  x4x5x6x7 = vcombine_u32(vget_low_u32(x4x5x14x15),vget_high_u32(x12x13x6x7));
+  x8x9x10x11 = vcombine_u32(vget_low_u32(x8x9x2x3),vget_high_u32(x0x1x10x11));
+  x12x13x14x15 = vcombine_u32(vget_low_u32(x12x13x6x7),vget_high_u32(x4x5x14x15));
+
+  vst1q_u8((uint8_t *) input,(uint8x16_t) x0x1x2x3);
+  vst1q_u8(16 + (uint8_t *) input,(uint8x16_t) x4x5x6x7);
+  vst1q_u8(32 + (uint8_t *) input,(uint8x16_t) x8x9x10x11);
+  vst1q_u8(48 + (uint8_t *) input,(uint8x16_t) x12x13x14x15);
+}
diff --git a/lib/crypto/crypto_scrypt-neon.c b/lib/crypto/crypto_scrypt-neon.c
new file mode 100644
index 0000000..a3bf052
--- /dev/null
+++ b/lib/crypto/crypto_scrypt-neon.c
@@ -0,0 +1,304 @@
+/*-
+ * Copyright 2009 Colin Percival
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file was originally written by Colin Percival as part of the Tarsnap
+ * online backup system.
+ */
+#include "scrypt_platform.h"
+
+#include <arm_neon.h>
+
+#include <errno.h>
+#include <stdint.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef USE_OPENSSL_PBKDF2
+#include <openssl/evp.h>
+#else
+#include "sha256.h"
+#endif
+#include "sysendian.h"
+
+#include "crypto_scrypt.h"
+
+#include "crypto_scrypt-neon-salsa208.h"
+
+static void blkcpy(void *, void *, size_t);
+static void blkxor(void *, void *, size_t);
+void crypto_core_salsa208_armneon2(void *);
+static void blockmix_salsa8(uint8x16_t *, uint8x16_t *, uint8x16_t *, size_t);
+static uint64_t integerify(void *, size_t);
+static void smix(uint8_t *, size_t, uint64_t, void *, void *);
+
+static void
+blkcpy(void * dest, void * src, size_t len)
+{
+	uint8x16_t * D = dest;
+	uint8x16_t * S = src;
+	size_t L = len / 16;
+	size_t i;
+
+	for (i = 0; i < L; i++)
+		D[i] = S[i];
+}
+
+static void
+blkxor(void * dest, void * src, size_t len)
+{
+	uint8x16_t * D = dest;
+	uint8x16_t * S = src;
+	size_t L = len / 16;
+	size_t i;
+
+	for (i = 0; i < L; i++)
+		D[i] = veorq_u8(D[i], S[i]);
+}
+
+/**
+ * blockmix_salsa8(B, Y, r):
+ * Compute B = BlockMix_{salsa20/8, r}(B).  The input B must be 128r bytes in
+ * length; the temporary space Y must also be the same size.
+ */
+static void
+blockmix_salsa8(uint8x16_t * Bin, uint8x16_t * Bout, uint8x16_t * X, size_t r)
+{
+	size_t i;
+
+	/* 1: X <-- B_{2r - 1} */
+	blkcpy(X, &Bin[8 * r - 4], 64);
+
+	/* 2: for i = 0 to 2r - 1 do */
+	for (i = 0; i < r; i++) {
+		/* 3: X <-- H(X \xor B_i) */
+		blkxor(X, &Bin[i * 8], 64);
+                salsa20_8_intrinsic((void *) X);
+
+		/* 4: Y_i <-- X */
+		/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
+		blkcpy(&Bout[i * 4], X, 64);
+
+		/* 3: X <-- H(X \xor B_i) */
+		blkxor(X, &Bin[i * 8 + 4], 64);
+                salsa20_8_intrinsic((void *) X);
+
+		/* 4: Y_i <-- X */
+		/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
+		blkcpy(&Bout[(r + i) * 4], X, 64);
+	}
+}
+
+/**
+ * integerify(B, r):
+ * Return the result of parsing B_{2r-1} as a little-endian integer.
+ */
+static uint64_t
+integerify(void * B, size_t r)
+{
+	uint8_t * X = (void*)((uintptr_t)(B) + (2 * r - 1) * 64);
+
+	return (le64dec(X));
+}
+
+/**
+ * smix(B, r, N, V, XY):
+ * Compute B = SMix_r(B, N).  The input B must be 128r bytes in length; the
+ * temporary storage V must be 128rN bytes in length; the temporary storage
+ * XY must be 256r bytes in length.  The value N must be a power of 2.
+ */
+static void
+smix(uint8_t * B, size_t r, uint64_t N, void * V, void * XY)
+{
+	uint8x16_t * X = XY;
+	uint8x16_t * Y = (void *)((uintptr_t)(XY) + 128 * r);
+        uint8x16_t * Z = (void *)((uintptr_t)(XY) + 256 * r);
+        uint32_t * X32 = (void *)X;
+	uint64_t i, j;
+        size_t k;
+
+	/* 1: X <-- B */
+	blkcpy(X, B, 128 * r);
+
+	/* 2: for i = 0 to N - 1 do */
+	for (i = 0; i < N; i += 2) {
+		/* 3: V_i <-- X */
+		blkcpy((void *)((uintptr_t)(V) + i * 128 * r), X, 128 * r);
+
+		/* 4: X <-- H(X) */
+		blockmix_salsa8(X, Y, Z, r);
+
+		/* 3: V_i <-- X */
+		blkcpy((void *)((uintptr_t)(V) + (i + 1) * 128 * r),
+		    Y, 128 * r);
+
+		/* 4: X <-- H(X) */
+		blockmix_salsa8(Y, X, Z, r);
+	}
+
+	/* 6: for i = 0 to N - 1 do */
+	for (i = 0; i < N; i += 2) {
+		/* 7: j <-- Integerify(X) mod N */
+		j = integerify(X, r) & (N - 1);
+
+		/* 8: X <-- H(X \xor V_j) */
+		blkxor(X, (void *)((uintptr_t)(V) + j * 128 * r), 128 * r);
+		blockmix_salsa8(X, Y, Z, r);
+
+		/* 7: j <-- Integerify(X) mod N */
+		j = integerify(Y, r) & (N - 1);
+
+		/* 8: X <-- H(X \xor V_j) */
+		blkxor(Y, (void *)((uintptr_t)(V) + j * 128 * r), 128 * r);
+		blockmix_salsa8(Y, X, Z, r);
+	}
+
+	/* 10: B' <-- X */
+	blkcpy(B, X, 128 * r);
+}
+
+/**
+ * crypto_scrypt(passwd, passwdlen, salt, saltlen, N, r, p, buf, buflen):
+ * Compute scrypt(passwd[0 .. passwdlen - 1], salt[0 .. saltlen - 1], N, r,
+ * p, buflen) and write the result into buf.  The parameters r, p, and buflen
+ * must satisfy r * p < 2^30 and buflen <= (2^32 - 1) * 32.  The parameter N
+ * must be a power of 2.
+ *
+ * Return 0 on success; or -1 on error.
+ */
+int
+crypto_scrypt(const uint8_t * passwd, size_t passwdlen,
+    const uint8_t * salt, size_t saltlen, uint64_t N, uint32_t r, uint32_t p,
+    uint8_t * buf, size_t buflen)
+{
+	void * B0, * V0, * XY0;
+	uint8_t * B;
+	uint32_t * V;
+	uint32_t * XY;
+	uint32_t i;
+
+	/* Sanity-check parameters. */
+#if SIZE_MAX > UINT32_MAX
+	if (buflen > (((uint64_t)(1) << 32) - 1) * 32) {
+		errno = EFBIG;
+		goto err0;
+	}
+#endif
+	if ((uint64_t)(r) * (uint64_t)(p) >= (1 << 30)) {
+		errno = EFBIG;
+		goto err0;
+	}
+	if (((N & (N - 1)) != 0) || (N == 0)) {
+		errno = EINVAL;
+		goto err0;
+	}
+	if ((r > SIZE_MAX / 128 / p) ||
+#if SIZE_MAX / 256 <= UINT32_MAX
+	    (r > SIZE_MAX / 256) ||
+#endif
+	    (N > SIZE_MAX / 128 / r)) {
+		errno = ENOMEM;
+		goto err0;
+	}
+
+	/* Allocate memory. */
+#ifdef HAVE_POSIX_MEMALIGN
+	if ((errno = posix_memalign(&B0, 64, 128 * r * p)) != 0)
+		goto err0;
+	B = (uint8_t *)(B0);
+	if ((errno = posix_memalign(&XY0, 64, 256 * r + 64)) != 0)
+		goto err1;
+	XY = (uint32_t *)(XY0);
+#ifndef MAP_ANON
+	if ((errno = posix_memalign(&V0, 64, 128 * r * N)) != 0)
+		goto err2;
+	V = (uint32_t *)(V0);
+#endif
+#else
+	if ((B0 = malloc(128 * r * p + 63)) == NULL)
+		goto err0;
+	B = (uint8_t *)(((uintptr_t)(B0) + 63) & ~ (uintptr_t)(63));
+	if ((XY0 = malloc(256 * r + 64 + 63)) == NULL)
+		goto err1;
+	XY = (uint32_t *)(((uintptr_t)(XY0) + 63) & ~ (uintptr_t)(63));
+#ifndef MAP_ANON
+	if ((V0 = malloc(128 * r * N + 63)) == NULL)
+		goto err2;
+	V = (uint32_t *)(((uintptr_t)(V0) + 63) & ~ (uintptr_t)(63));
+#endif
+#endif
+#ifdef MAP_ANON
+	if ((V0 = mmap(NULL, 128 * r * N, PROT_READ | PROT_WRITE,
+#ifdef MAP_NOCORE
+	    MAP_ANON | MAP_PRIVATE | MAP_NOCORE,
+#else
+	    MAP_ANON | MAP_PRIVATE,
+#endif
+	    -1, 0)) == MAP_FAILED)
+		goto err2;
+	V = (uint32_t *)(V0);
+#endif
+
+	/* 1: (B_0 ... B_{p-1}) <-- PBKDF2(P, S, 1, p * MFLen) */
+#ifdef USE_OPENSSL_PBKDF2
+	PKCS5_PBKDF2_HMAC((const char *)passwd, passwdlen, salt, saltlen, 1, EVP_sha256(), p * 128 * r, B);
+#else
+	PBKDF2_SHA256(passwd, passwdlen, salt, saltlen, 1, B, p * 128 * r);
+#endif
+
+	/* 2: for i = 0 to p - 1 do */
+	for (i = 0; i < p; i++) {
+		/* 3: B_i <-- MF(B_i, N) */
+		smix(&B[i * 128 * r], r, N, V, XY);
+	}
+
+	/* 5: DK <-- PBKDF2(P, B, 1, dkLen) */
+#ifdef USE_OPENSSL_PBKDF2
+	PKCS5_PBKDF2_HMAC((const char *)passwd, passwdlen, B, p * 128 * r, 1, EVP_sha256(), buflen, buf);
+#else
+	PBKDF2_SHA256(passwd, passwdlen, B, p * 128 * r, 1, buf, buflen);
+#endif
+
+	/* Free memory. */
+#ifdef MAP_ANON
+	if (munmap(V0, 128 * r * N))
+		goto err2;
+#else
+	free(V0);
+#endif
+	free(XY0);
+	free(B0);
+
+	/* Success! */
+	return (0);
+
+err2:
+	free(XY0);
+err1:
+	free(B0);
+err0:
+	/* Failure! */
+	return (-1);
+}