mirror of
https://github.com/urbit/shrub.git
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330 lines
8.4 KiB
C
330 lines
8.4 KiB
C
/*-
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* Copyright 2009 Colin Percival
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file was originally written by Colin Percival as part of the Tarsnap
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* online backup system.
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*/
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <errno.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "sha256.h"
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#include "sysendian.h"
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#include "crypto_scrypt.h"
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static void
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blkcpy(void * dest, void * src, size_t len)
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{
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size_t * D = dest;
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size_t * S = src;
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size_t L = len / sizeof(size_t);
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size_t i;
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for (i = 0; i < L; i++)
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D[i] = S[i];
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}
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static void
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blkxor(void * dest, void * src, size_t len)
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{
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size_t * D = dest;
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size_t * S = src;
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size_t L = len / sizeof(size_t);
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size_t i;
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for (i = 0; i < L; i++)
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D[i] ^= S[i];
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}
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/**
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* salsa20_8(B):
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* Apply the salsa20/8 core to the provided block.
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*/
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static void
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salsa20_8(uint32_t B[16])
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{
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uint32_t x[16];
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size_t i;
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blkcpy(x, B, 64);
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for (i = 0; i < 8; i += 2) {
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#define R(a,b) (((a) << (b)) | ((a) >> (32 - (b))))
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/* Operate on columns. */
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x[ 4] ^= R(x[ 0]+x[12], 7); x[ 8] ^= R(x[ 4]+x[ 0], 9);
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x[12] ^= R(x[ 8]+x[ 4],13); x[ 0] ^= R(x[12]+x[ 8],18);
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x[ 9] ^= R(x[ 5]+x[ 1], 7); x[13] ^= R(x[ 9]+x[ 5], 9);
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x[ 1] ^= R(x[13]+x[ 9],13); x[ 5] ^= R(x[ 1]+x[13],18);
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x[14] ^= R(x[10]+x[ 6], 7); x[ 2] ^= R(x[14]+x[10], 9);
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x[ 6] ^= R(x[ 2]+x[14],13); x[10] ^= R(x[ 6]+x[ 2],18);
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x[ 3] ^= R(x[15]+x[11], 7); x[ 7] ^= R(x[ 3]+x[15], 9);
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x[11] ^= R(x[ 7]+x[ 3],13); x[15] ^= R(x[11]+x[ 7],18);
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/* Operate on rows. */
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x[ 1] ^= R(x[ 0]+x[ 3], 7); x[ 2] ^= R(x[ 1]+x[ 0], 9);
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x[ 3] ^= R(x[ 2]+x[ 1],13); x[ 0] ^= R(x[ 3]+x[ 2],18);
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x[ 6] ^= R(x[ 5]+x[ 4], 7); x[ 7] ^= R(x[ 6]+x[ 5], 9);
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x[ 4] ^= R(x[ 7]+x[ 6],13); x[ 5] ^= R(x[ 4]+x[ 7],18);
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x[11] ^= R(x[10]+x[ 9], 7); x[ 8] ^= R(x[11]+x[10], 9);
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x[ 9] ^= R(x[ 8]+x[11],13); x[10] ^= R(x[ 9]+x[ 8],18);
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x[12] ^= R(x[15]+x[14], 7); x[13] ^= R(x[12]+x[15], 9);
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x[14] ^= R(x[13]+x[12],13); x[15] ^= R(x[14]+x[13],18);
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#undef R
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}
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for (i = 0; i < 16; i++)
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B[i] += x[i];
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}
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/**
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* blockmix_salsa8(Bin, Bout, X, r):
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* Compute Bout = BlockMix_{salsa20/8, r}(Bin). The input Bin must be 128r
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* bytes in length; the output Bout must also be the same size. The
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* temporary space X must be 64 bytes.
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*/
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static void
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blockmix_salsa8(uint32_t * Bin, uint32_t * Bout, uint32_t * X, size_t r)
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{
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size_t i;
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/* 1: X <-- B_{2r - 1} */
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blkcpy(X, &Bin[(2 * r - 1) * 16], 64);
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/* 2: for i = 0 to 2r - 1 do */
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for (i = 0; i < 2 * r; i += 2) {
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/* 3: X <-- H(X \xor B_i) */
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blkxor(X, &Bin[i * 16], 64);
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salsa20_8(X);
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/* 4: Y_i <-- X */
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/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
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blkcpy(&Bout[i * 8], X, 64);
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/* 3: X <-- H(X \xor B_i) */
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blkxor(X, &Bin[i * 16 + 16], 64);
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salsa20_8(X);
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/* 4: Y_i <-- X */
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/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
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blkcpy(&Bout[i * 8 + r * 16], X, 64);
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}
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}
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/**
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* integerify(B, r):
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* Return the result of parsing B_{2r-1} as a little-endian integer.
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*/
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static uint64_t
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integerify(void * B, size_t r)
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{
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uint32_t * X = (void *)((uintptr_t)(B) + (2 * r - 1) * 64);
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return (((uint64_t)(X[1]) << 32) + X[0]);
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}
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/**
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* smix(B, r, N, V, XY):
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* Compute B = SMix_r(B, N). The input B must be 128r bytes in length;
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* the temporary storage V must be 128rN bytes in length; the temporary
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* storage XY must be 256r + 64 bytes in length. The value N must be a
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* power of 2 greater than 1. The arrays B, V, and XY must be aligned to a
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* multiple of 64 bytes.
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*/
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void
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smix(uint8_t * B, size_t r, uint64_t N, uint32_t * V, uint32_t * XY)
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{
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uint32_t * X = XY;
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uint32_t * Y = &XY[32 * r];
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uint32_t * Z = &XY[64 * r];
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uint64_t i;
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uint64_t j;
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size_t k;
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/* 1: X <-- B */
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for (k = 0; k < 32 * r; k++)
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X[k] = le32dec(&B[4 * k]);
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/* 2: for i = 0 to N - 1 do */
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for (i = 0; i < N; i += 2) {
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/* 3: V_i <-- X */
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blkcpy(&V[i * (32 * r)], X, 128 * r);
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/* 4: X <-- H(X) */
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blockmix_salsa8(X, Y, Z, r);
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/* 3: V_i <-- X */
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blkcpy(&V[(i + 1) * (32 * r)], Y, 128 * r);
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/* 4: X <-- H(X) */
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blockmix_salsa8(Y, X, Z, r);
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}
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/* 6: for i = 0 to N - 1 do */
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for (i = 0; i < N; i += 2) {
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/* 7: j <-- Integerify(X) mod N */
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j = integerify(X, r) & (N - 1);
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/* 8: X <-- H(X \xor V_j) */
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blkxor(X, &V[j * (32 * r)], 128 * r);
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blockmix_salsa8(X, Y, Z, r);
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/* 7: j <-- Integerify(X) mod N */
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j = integerify(Y, r) & (N - 1);
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/* 8: X <-- H(X \xor V_j) */
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blkxor(Y, &V[j * (32 * r)], 128 * r);
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blockmix_salsa8(Y, X, Z, r);
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}
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/* 10: B' <-- X */
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for (k = 0; k < 32 * r; k++)
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le32enc(&B[4 * k], X[k]);
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}
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/**
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* crypto_scrypt(passwd, passwdlen, salt, saltlen, N, r, p, buf, buflen):
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* Compute scrypt(passwd[0 .. passwdlen - 1], salt[0 .. saltlen - 1], N, r,
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* p, buflen) and write the result into buf. The parameters r, p, and buflen
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* must satisfy r * p < 2^30 and buflen <= (2^32 - 1) * 32. The parameter N
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* must be a power of 2 greater than 1.
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*
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* Return 0 on success; or -1 on error.
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*/
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int
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crypto_scrypt(const uint8_t * passwd, size_t passwdlen,
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const uint8_t * salt, size_t saltlen, uint64_t N, uint32_t r, uint32_t p,
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uint8_t * buf, size_t buflen)
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{
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void * B0, * V0, * XY0;
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uint8_t * B;
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uint32_t * V;
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uint32_t * XY;
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uint32_t i;
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/* Sanity-check parameters. */
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#if SIZE_MAX > UINT32_MAX
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if (buflen > (((uint64_t)(1) << 32) - 1) * 32) {
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errno = EFBIG;
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goto err0;
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}
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#endif
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if ((uint64_t)(r) * (uint64_t)(p) >= (1 << 30)) {
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errno = EFBIG;
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goto err0;
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}
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if (((N & (N - 1)) != 0) || (N == 0)) {
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errno = EINVAL;
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goto err0;
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}
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if ((r > SIZE_MAX / 128 / p) ||
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#if SIZE_MAX / 256 <= UINT32_MAX
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(r > SIZE_MAX / 256) ||
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#endif
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(N > SIZE_MAX / 128 / r)) {
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errno = ENOMEM;
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goto err0;
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}
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/* Allocate memory. */
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#ifdef HAVE_POSIX_MEMALIGN
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if ((errno = posix_memalign(&B0, 64, 128 * r * p)) != 0)
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goto err0;
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B = (uint8_t *)(B0);
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if ((errno = posix_memalign(&XY0, 64, 256 * r + 64)) != 0)
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goto err1;
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XY = (uint32_t *)(XY0);
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#ifndef MAP_ANON
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if ((errno = posix_memalign(&V0, 64, 128 * r * N)) != 0)
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goto err2;
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V = (uint32_t *)(V0);
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#endif
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#else
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if ((B0 = malloc(128 * r * p + 63)) == NULL)
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goto err0;
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B = (uint8_t *)(((uintptr_t)(B0) + 63) & ~ (uintptr_t)(63));
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if ((XY0 = malloc(256 * r + 64 + 63)) == NULL)
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goto err1;
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XY = (uint32_t *)(((uintptr_t)(XY0) + 63) & ~ (uintptr_t)(63));
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#ifndef MAP_ANON
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if ((V0 = malloc(128 * r * N + 63)) == NULL)
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goto err2;
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V = (uint32_t *)(((uintptr_t)(V0) + 63) & ~ (uintptr_t)(63));
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#endif
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#endif
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#ifdef MAP_ANON
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if ((V0 = mmap(NULL, 128 * r * N, PROT_READ | PROT_WRITE,
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#ifdef MAP_NOCORE
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MAP_ANON | MAP_PRIVATE | MAP_NOCORE,
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#else
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MAP_ANON | MAP_PRIVATE,
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#endif
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-1, 0)) == MAP_FAILED)
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goto err2;
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V = (uint32_t *)(V0);
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#endif
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/* 1: (B_0 ... B_{p-1}) <-- PBKDF2(P, S, 1, p * MFLen) */
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PBKDF2_SHA256(passwd, passwdlen, salt, saltlen, 1, B, p * 128 * r);
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/* 2: for i = 0 to p - 1 do */
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for (i = 0; i < p; i++) {
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/* 3: B_i <-- MF(B_i, N) */
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smix(&B[i * 128 * r], r, N, V, XY);
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}
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/* 5: DK <-- PBKDF2(P, B, 1, dkLen) */
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PBKDF2_SHA256(passwd, passwdlen, B, p * 128 * r, 1, buf, buflen);
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/* Free memory. */
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#ifdef MAP_ANON
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if (munmap(V0, 128 * r * N))
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goto err2;
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#else
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free(V0);
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#endif
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free(XY0);
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free(B0);
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/* Success! */
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return (0);
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err2:
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free(XY0);
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err1:
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free(B0);
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err0:
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/* Failure! */
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return (-1);
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}
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