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Diffstat (limited to 'lib/crypto/crypto_scrypt-ref.c')
-rw-r--r-- | lib/crypto/crypto_scrypt-ref.c | 283 |
1 files changed, 0 insertions, 283 deletions
diff --git a/lib/crypto/crypto_scrypt-ref.c b/lib/crypto/crypto_scrypt-ref.c deleted file mode 100644 index 1b0d514..0000000 --- a/lib/crypto/crypto_scrypt-ref.c +++ /dev/null @@ -1,283 +0,0 @@ -/*- - * 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 <errno.h> -#include <stdint.h> -#include <stdlib.h> -#include <string.h> - -#include "sha256.h" -#include "sysendian.h" - -#include "crypto_scrypt.h" - -static void blkcpy(uint8_t *, uint8_t *, size_t); -static void blkxor(uint8_t *, uint8_t *, size_t); -static void salsa20_8(uint8_t[64]); -static void blockmix_salsa8(uint8_t *, uint8_t *, size_t); -static uint64_t integerify(uint8_t *, size_t); -static void smix(uint8_t *, size_t, uint64_t, uint8_t *, uint8_t *); - -static void -blkcpy(uint8_t * dest, uint8_t * src, size_t len) -{ - size_t i; - - for (i = 0; i < len; i++) - dest[i] = src[i]; -} - -static void -blkxor(uint8_t * dest, uint8_t * src, size_t len) -{ - size_t i; - - for (i = 0; i < len; i++) - dest[i] ^= src[i]; -} - -/** - * salsa20_8(B): - * Apply the salsa20/8 core to the provided block. - */ -static void -salsa20_8(uint8_t B[64]) -{ - uint32_t B32[16]; - uint32_t x[16]; - size_t i; - - /* Convert little-endian values in. */ - for (i = 0; i < 16; i++) - B32[i] = le32dec(&B[i * 4]); - - /* Compute x = doubleround^4(B32). */ - for (i = 0; i < 16; i++) - x[i] = B32[i]; - for (i = 0; i < 8; i += 2) { -#define R(a,b) (((a) << (b)) | ((a) >> (32 - (b)))) - /* Operate on columns. */ - x[ 4] ^= R(x[ 0]+x[12], 7); x[ 8] ^= R(x[ 4]+x[ 0], 9); - x[12] ^= R(x[ 8]+x[ 4],13); x[ 0] ^= R(x[12]+x[ 8],18); - - x[ 9] ^= R(x[ 5]+x[ 1], 7); x[13] ^= R(x[ 9]+x[ 5], 9); - x[ 1] ^= R(x[13]+x[ 9],13); x[ 5] ^= R(x[ 1]+x[13],18); - - x[14] ^= R(x[10]+x[ 6], 7); x[ 2] ^= R(x[14]+x[10], 9); - x[ 6] ^= R(x[ 2]+x[14],13); x[10] ^= R(x[ 6]+x[ 2],18); - - x[ 3] ^= R(x[15]+x[11], 7); x[ 7] ^= R(x[ 3]+x[15], 9); - x[11] ^= R(x[ 7]+x[ 3],13); x[15] ^= R(x[11]+x[ 7],18); - - /* Operate on rows. */ - x[ 1] ^= R(x[ 0]+x[ 3], 7); x[ 2] ^= R(x[ 1]+x[ 0], 9); - x[ 3] ^= R(x[ 2]+x[ 1],13); x[ 0] ^= R(x[ 3]+x[ 2],18); - - x[ 6] ^= R(x[ 5]+x[ 4], 7); x[ 7] ^= R(x[ 6]+x[ 5], 9); - x[ 4] ^= R(x[ 7]+x[ 6],13); x[ 5] ^= R(x[ 4]+x[ 7],18); - - x[11] ^= R(x[10]+x[ 9], 7); x[ 8] ^= R(x[11]+x[10], 9); - x[ 9] ^= R(x[ 8]+x[11],13); x[10] ^= R(x[ 9]+x[ 8],18); - - x[12] ^= R(x[15]+x[14], 7); x[13] ^= R(x[12]+x[15], 9); - x[14] ^= R(x[13]+x[12],13); x[15] ^= R(x[14]+x[13],18); -#undef R - } - - /* Compute B32 = B32 + x. */ - for (i = 0; i < 16; i++) - B32[i] += x[i]; - - /* Convert little-endian values out. */ - for (i = 0; i < 16; i++) - le32enc(&B[4 * i], B32[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(uint8_t * B, uint8_t * Y, size_t r) -{ - uint8_t X[64]; - size_t i; - - /* 1: X <-- B_{2r - 1} */ - blkcpy(X, &B[(2 * r - 1) * 64], 64); - - /* 2: for i = 0 to 2r - 1 do */ - for (i = 0; i < 2 * r; i++) { - /* 3: X <-- H(X \xor B_i) */ - blkxor(X, &B[i * 64], 64); - salsa20_8(X); - - /* 4: Y_i <-- X */ - blkcpy(&Y[i * 64], X, 64); - } - - /* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */ - for (i = 0; i < r; i++) - blkcpy(&B[i * 64], &Y[(i * 2) * 64], 64); - for (i = 0; i < r; i++) - blkcpy(&B[(i + r) * 64], &Y[(i * 2 + 1) * 64], 64); -} - -/** - * integerify(B, r): - * Return the result of parsing B_{2r-1} as a little-endian integer. - */ -static uint64_t -integerify(uint8_t * B, size_t r) -{ - uint8_t * X = &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, uint8_t * V, uint8_t * XY) -{ - uint8_t * X = XY; - uint8_t * Y = &XY[128 * r]; - uint64_t i; - uint64_t j; - - /* 1: X <-- B */ - blkcpy(X, B, 128 * r); - - /* 2: for i = 0 to N - 1 do */ - for (i = 0; i < N; i++) { - /* 3: V_i <-- X */ - blkcpy(&V[i * (128 * r)], X, 128 * r); - - /* 4: X <-- H(X) */ - blockmix_salsa8(X, Y, r); - } - - /* 6: for i = 0 to N - 1 do */ - for (i = 0; i < N; i++) { - /* 7: j <-- Integerify(X) mod N */ - j = integerify(X, r) & (N - 1); - - /* 8: X <-- H(X \xor V_j) */ - blkxor(X, &V[j * (128 * r)], 128 * r); - blockmix_salsa8(X, Y, 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) -{ - uint8_t * B; - uint8_t * V; - uint8_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. */ - if ((B = malloc(128 * r * p)) == NULL) - goto err0; - if ((XY = malloc(256 * r)) == NULL) - goto err1; - if ((V = malloc(128 * r * N)) == NULL) - goto err2; - - /* 1: (B_0 ... B_{p-1}) <-- PBKDF2(P, S, 1, p * MFLen) */ - PBKDF2_SHA256(passwd, passwdlen, salt, saltlen, 1, B, p * 128 * r); - - /* 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) */ - PBKDF2_SHA256(passwd, passwdlen, B, p * 128 * r, 1, buf, buflen); - - /* Free memory. */ - free(V); - free(XY); - free(B); - - /* Success! */ - return (0); - -err2: - free(XY); -err1: - free(B); -err0: - /* Failure! */ - return (-1); -} |