diff options
Diffstat (limited to 'libs/libtox/src/toxencryptsave/crypto_pwhash_scryptsalsa208sha256/crypto_scrypt-common.c')
| -rw-r--r-- | libs/libtox/src/toxencryptsave/crypto_pwhash_scryptsalsa208sha256/crypto_scrypt-common.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/libs/libtox/src/toxencryptsave/crypto_pwhash_scryptsalsa208sha256/crypto_scrypt-common.c b/libs/libtox/src/toxencryptsave/crypto_pwhash_scryptsalsa208sha256/crypto_scrypt-common.c new file mode 100644 index 0000000000..5a5c5525f3 --- /dev/null +++ b/libs/libtox/src/toxencryptsave/crypto_pwhash_scryptsalsa208sha256/crypto_scrypt-common.c @@ -0,0 +1,257 @@ +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif +#ifdef VANILLA_NACL /* toxcore only uses this when libsodium is unavailable */ + +/*- + * Copyright 2013 Alexander Peslyak + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted. + * + * 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. + */ + +#include <stdint.h> +#include <string.h> + +#include "crypto_pwhash_scryptsalsa208sha256.h" +#include "crypto_scrypt.h" +#include "runtime.h" +#include "utils.h" + +static const char * const itoa64 = + "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; + +static uint8_t * +encode64_uint32(uint8_t * dst, size_t dstlen, uint32_t src, uint32_t srcbits) +{ + uint32_t bit; + + for (bit = 0; bit < srcbits; bit += 6) { + if (dstlen < 1) { + return NULL; + } + *dst++ = itoa64[src & 0x3f]; + dstlen--; + src >>= 6; + } + + return dst; +} + +static uint8_t * +encode64(uint8_t * dst, size_t dstlen, const uint8_t * src, size_t srclen) +{ + size_t i; + + for (i = 0; i < srclen; ) { + uint8_t * dnext; + uint32_t value = 0, bits = 0; + do { + value |= (uint32_t)src[i++] << bits; + bits += 8; + } while (bits < 24 && i < srclen); + dnext = encode64_uint32(dst, dstlen, value, bits); + if (!dnext) { + return NULL; + } + dstlen -= dnext - dst; + dst = dnext; + } + + return dst; +} + +static int +decode64_one(uint32_t * dst, uint8_t src) +{ + const char *ptr = strchr(itoa64, src); + + if (ptr) { + *dst = ptr - itoa64; + return 0; + } + *dst = 0; + return -1; +} + +static const uint8_t * +decode64_uint32(uint32_t * dst, uint32_t dstbits, const uint8_t * src) +{ + uint32_t bit; + uint32_t value; + + value = 0; + for (bit = 0; bit < dstbits; bit += 6) { + uint32_t one; + if (decode64_one(&one, *src)) { + *dst = 0; + return NULL; + } + src++; + value |= one << bit; + } + + *dst = value; + return src; +} + +uint8_t * +escrypt_r(escrypt_local_t * local, const uint8_t * passwd, size_t passwdlen, + const uint8_t * setting, uint8_t * buf, size_t buflen) +{ + uint8_t hash[crypto_pwhash_scryptsalsa208sha256_STRHASHBYTES]; + escrypt_kdf_t escrypt_kdf; + const uint8_t *src; + const uint8_t *salt; + uint8_t *dst; + size_t prefixlen; + size_t saltlen; + size_t need; + uint64_t N; + uint32_t N_log2; + uint32_t r; + uint32_t p; + + if (setting[0] != '$' || setting[1] != '7' || setting[2] != '$') { + return NULL; + } + src = setting + 3; + + if (decode64_one(&N_log2, *src)) { + return NULL; + } + src++; + N = (uint64_t)1 << N_log2; + + src = decode64_uint32(&r, 30, src); + if (!src) { + return NULL; + } + src = decode64_uint32(&p, 30, src); + if (!src) { + return NULL; + } + prefixlen = src - setting; + + salt = src; + src = (uint8_t *) strrchr((char *)salt, '$'); + if (src) { + saltlen = src - salt; + } else { + saltlen = strlen((char *)salt); + } + need = prefixlen + saltlen + 1 + + crypto_pwhash_scryptsalsa208sha256_STRHASHBYTES_ENCODED + 1; + if (need > buflen || need < saltlen) { + return NULL; + } +#if defined(HAVE_EMMINTRIN_H) || defined(_MSC_VER) + escrypt_kdf = + sodium_runtime_has_sse2() ? escrypt_kdf_sse : escrypt_kdf_nosse; +#else + escrypt_kdf = escrypt_kdf_nosse; +#endif + if (escrypt_kdf(local, passwd, passwdlen, salt, saltlen, + N, r, p, hash, sizeof(hash))) { + return NULL; + } + + dst = buf; + memcpy(dst, setting, prefixlen + saltlen); + dst += prefixlen + saltlen; + *dst++ = '$'; + + dst = encode64(dst, buflen - (dst - buf), hash, sizeof(hash)); + sodium_memzero(hash, sizeof hash); + if (!dst || dst >= buf + buflen) { /* Can't happen */ + return NULL; + } + *dst = 0; /* NUL termination */ + + return buf; +} + +uint8_t * +escrypt_gensalt_r(uint32_t N_log2, uint32_t r, uint32_t p, + const uint8_t * src, size_t srclen, + uint8_t * buf, size_t buflen) +{ + uint8_t *dst; + size_t prefixlen = + (sizeof "$7$" - 1U) + (1U /* N_log2 */) + (5U /* r */) + (5U /* p */); + size_t saltlen = BYTES2CHARS(srclen); + size_t need; + + need = prefixlen + saltlen + 1; + if (need > buflen || need < saltlen || saltlen < srclen) { + return NULL; + } + if (N_log2 > 63 || ((uint64_t)r * (uint64_t)p >= (1U << 30))) { + return NULL; + } + dst = buf; + *dst++ = '$'; + *dst++ = '7'; + *dst++ = '$'; + + *dst++ = itoa64[N_log2]; + + dst = encode64_uint32(dst, buflen - (dst - buf), r, 30); + if (!dst) { /* Can't happen */ + return NULL; + } + dst = encode64_uint32(dst, buflen - (dst - buf), p, 30); + if (!dst) { /* Can't happen */ + return NULL; + } + dst = encode64(dst, buflen - (dst - buf), src, srclen); + if (!dst || dst >= buf + buflen) { /* Can't happen */ + return NULL; + } + *dst = 0; /* NUL termination */ + + return buf; +} + +int +crypto_pwhash_scryptsalsa208sha256_ll(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) +{ + escrypt_kdf_t escrypt_kdf; + escrypt_local_t local; + int retval; + + if (escrypt_init_local(&local)) { + return -1; + } +#if defined(HAVE_EMMINTRIN_H) || defined(_MSC_VER) + escrypt_kdf = + sodium_runtime_has_sse2() ? escrypt_kdf_sse : escrypt_kdf_nosse; +#else + escrypt_kdf = escrypt_kdf_nosse; +#endif + retval = escrypt_kdf(&local, + passwd, passwdlen, salt, saltlen, + N, r, p, buf, buflen); + if (escrypt_free_local(&local)) { + return -1; + } + return retval; +} + +#endif |