--- /dev/null
+/* scrypt.c */
+/*
+ * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
+ * 2015.
+ */
+/* ====================================================================
+ * Copyright (c) 2015 The OpenSSL Project. 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.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ * software must display the following acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission. For written permission, please contact
+ * licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ * nor may "OpenSSL" appear in their names without prior written
+ * permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED 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 OpenSSL PROJECT OR
+ * ITS 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 product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com). This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+#include <openssl/evp.h>
+#include <internal/numbers.h>
+
+#define R(a,b) (((a) << (b)) | ((a) >> (32 - (b))))
+static void salsa208_word_specification(uint32_t inout[16])
+{
+ int i;
+ uint32_t x[16];
+ memcpy(x, inout, sizeof(x));
+ for (i = 8; i > 0; i -= 2) {
+ 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);
+ 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);
+ }
+ for (i = 0; i < 16; ++i)
+ inout[i] += x[i];
+ OPENSSL_cleanse(x, sizeof(x));
+}
+
+static void scryptBlockMix(uint32_t *B_, uint32_t *B, uint64_t r)
+{
+ uint64_t i, j;
+ uint32_t X[16], *pB;
+
+ memcpy(X, B + (r * 2 - 1) * 16, sizeof(X));
+ pB = B;
+ for (i = 0; i < r * 2; i++) {
+ for (j = 0; j < 16; j++)
+ X[j] ^= *pB++;
+ salsa208_word_specification(X);
+ memcpy(B_ + (i / 2 + (i & 1) * r) * 16, X, sizeof(X));
+ }
+ OPENSSL_cleanse(X, sizeof(X));
+}
+
+static void scryptROMix(unsigned char *B, uint64_t r, uint64_t N,
+ uint32_t *X, uint32_t *T, uint32_t *V)
+{
+ unsigned char *pB;
+ uint32_t *pV;
+ uint64_t i, k;
+
+ /* Convert from little endian input */
+ for (pV = V, i = 0, pB = B; i < 32 * r; i++, pV++) {
+ *pV = *pB++;
+ *pV |= *pB++ << 8;
+ *pV |= *pB++ << 16;
+ *pV |= *pB++ << 24;
+ }
+
+ for (i = 1; i < N; i++, pV += 32 * r)
+ scryptBlockMix(pV, pV - 32 * r, r);
+
+ scryptBlockMix(X, V + (N - 1) * 32 * r, r);
+
+ for (i = 0; i < N; i++) {
+ uint32_t j;
+ j = X[16 * (2 * r - 1)] % N;
+ pV = V + 32 * r * j;
+ for (k = 0; k < 32 * r; k++)
+ T[k] = X[k] ^ *pV++;
+ scryptBlockMix(X, T, r);
+ }
+ /* Convert output to little endian */
+ for (i = 0, pB = B; i < 32 * r; i++) {
+ uint32_t xtmp = X[i];
+ *pB++ = xtmp & 0xff;
+ *pB++ = (xtmp >> 8) & 0xff;
+ *pB++ = (xtmp >> 16) & 0xff;
+ *pB++ = (xtmp >> 24) & 0xff;
+ }
+}
+
+#ifndef SIZE_MAX
+# define SIZE_MAX ((size_t)-1)
+#endif
+
+/*
+ * Maximum power of two that will fit in uint64_t: this should work on
+ * most (all?) platforms.
+ */
+
+#define LOG2_UINT64_MAX (sizeof(uint64_t) * 8 - 1)
+
+/*
+ * Maximum value of p * r:
+ * p <= ((2^32-1) * hLen) / MFLen =>
+ * p <= ((2^32-1) * 32) / (128 * r) =>
+ * p * r <= (2^30-1)
+ *
+ */
+
+#define SCRYPT_PR_MAX ((1 << 30) - 1)
+
+/*
+ * Maximum permitted memory allow this to be overridden with Configuration
+ * option: e.g. -DSCRYPT_MAX_MEM=0 for maximum possible.
+ */
+
+#ifdef SCRYPT_MAX_MEM
+# if SCRYPT_MAX_MEM == 0
+# undef SCRYPT_MAX_MEM
+/*
+ * Although we could theoretically allocate SIZE_MAX memory that would leave
+ * no memory available for anything else so set limit as half that.
+ */
+# define SCRYPT_MAX_MEM (SIZE_MAX/2)
+# endif
+#else
+/* Default memory limit: 32 MB */
+# define SCRYPT_MAX_MEM (1024 * 1024 * 32)
+#endif
+
+int EVP_PBE_scrypt(const char *pass, size_t passlen,
+ const unsigned char *salt, size_t saltlen,
+ uint64_t N, uint64_t r, uint64_t p, uint64_t maxmem,
+ unsigned char *key, size_t keylen)
+{
+ int rv = 0;
+ unsigned char *B;
+ uint32_t *X, *V, *T;
+ uint64_t i, Blen, Vlen;
+
+ /* Sanity check parameters */
+ /* initial check, r,p must be non zero, N >= 2 and a power of 2 */
+ if (r == 0 || p == 0 || N < 2 || (N & (N - 1)))
+ return 0;
+ /* Check p * r < SCRYPT_PR_MAX avoiding overflow */
+ if (p > SCRYPT_PR_MAX / r)
+ return 0;
+
+ /*
+ * Need to check N: if 2^(128 * r / 8) overflows limit this is
+ * automatically satisfied since N <= UINT64_MAX.
+ */
+
+ if (16 * r <= LOG2_UINT64_MAX) {
+ if (N >= (1UL << (16 * r)))
+ return 0;
+ }
+
+ /* Memory checks: check total allocated buffer size fits in uint64_t */
+
+ /*
+ * B size in section 5 step 1.S
+ * Note: we know p * 128 * r < UINT64_MAX because we already checked
+ * p * r < SCRYPT_PR_MAX
+ */
+ Blen = p * 128 * r;
+
+ /*
+ * Check 32 * r * (N + 2) * sizeof(uint32_t) fits in uint64_t.
+ * This is combined size V, X and T (section 4)
+ */
+ i = UINT64_MAX / (32 * sizeof(uint32_t));
+ if (N + 2 > i / r)
+ return 0;
+ Vlen = 32 * r * (N + 2) * sizeof(uint32_t);
+
+ /* check total allocated size fits in uint64_t */
+ if (Blen > UINT64_MAX - Vlen)
+ return 0;
+
+ if (maxmem == 0)
+ maxmem = SCRYPT_MAX_MEM;
+
+ if (Blen + Vlen > maxmem)
+ return 0;
+
+ /* If no key return to indicate parameters are OK */
+ if (key == NULL)
+ return 1;
+
+ B = OPENSSL_malloc(Blen + Vlen);
+ if (B == 0)
+ return 0;
+ X = (uint32_t *)(B + Blen);
+ T = X + 32 * r;
+ V = T + 32 * r;
+ if (PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, 1, EVP_sha256(),
+ Blen, B) == 0)
+ goto err;
+
+ for (i = 0; i < p; i++)
+ scryptROMix(B + 128 * r * i, r, N, X, T, V);
+
+ if (PKCS5_PBKDF2_HMAC(pass, passlen, B, Blen, 1, EVP_sha256(),
+ keylen, key) == 0)
+ goto err;
+ rv = 1;
+#ifdef SCRYPT_DEBUG
+ fprintf(stderr, "scrypt parameters:\n");
+ fprintf(stderr, "N=%lu, p=%lu, r=%lu\n", N, p, r);
+ fprintf(stderr, "Salt:\n");
+ BIO_dump_fp(stderr, (char *)salt, saltlen);
+ fprintf(stderr, "Password:\n");
+ BIO_dump_fp(stderr, (char *)pass, passlen);
+ fprintf(stderr, "Key:\n");
+ BIO_dump_fp(stderr, (char *)key, keylen);
+#endif
+ err:
+ OPENSSL_clear_free(B, Blen + Vlen);
+ return rv;
+}
projects / openssl.git / commitdiff