mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-24 11:45:27 +01:00
481 lines
11 KiB
C
481 lines
11 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2006
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* 2007, 2008, 2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/crypto.h>
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#include <grub/misc.h>
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#include <grub/mm.h>
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#include <grub/term.h>
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#include <grub/dl.h>
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#include <grub/i18n.h>
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#include <grub/env.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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struct grub_crypto_hmac_handle
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{
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const struct gcry_md_spec *md;
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void *ctx;
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void *opad;
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};
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static gcry_cipher_spec_t *grub_ciphers = NULL;
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static gcry_md_spec_t *grub_digests = NULL;
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void (*grub_crypto_autoload_hook) (const char *name) = NULL;
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/* Based on libgcrypt-1.4.4/src/misc.c. */
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void
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grub_burn_stack (grub_size_t size)
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{
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char buf[64];
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grub_memset (buf, 0, sizeof (buf));
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if (size > sizeof (buf))
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grub_burn_stack (size - sizeof (buf));
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}
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void
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_gcry_burn_stack (int size)
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{
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grub_burn_stack (size);
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}
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void __attribute__ ((noreturn))
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_gcry_assert_failed (const char *expr, const char *file, int line,
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const char *func)
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{
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grub_fatal ("assertion %s at %s:%d (%s) failed\n", expr, file, line, func);
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}
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void _gcry_log_error (const char *fmt, ...)
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{
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va_list args;
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const char *debug = grub_env_get ("debug");
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if (! debug)
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return;
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if (grub_strword (debug, "all") || grub_strword (debug, "gcrypt"))
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{
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grub_printf ("gcrypt error: ");
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va_start (args, fmt);
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grub_vprintf (fmt, args);
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va_end (args);
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grub_refresh ();
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}
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}
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void
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grub_cipher_register (gcry_cipher_spec_t *cipher)
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{
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cipher->next = grub_ciphers;
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grub_ciphers = cipher;
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}
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void
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grub_cipher_unregister (gcry_cipher_spec_t *cipher)
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{
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gcry_cipher_spec_t **ciph;
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for (ciph = &grub_ciphers; *ciph; ciph = &((*ciph)->next))
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if (*ciph == cipher)
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{
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*ciph = (*ciph)->next;
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break;
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}
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}
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void
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grub_md_register (gcry_md_spec_t *digest)
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{
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digest->next = grub_digests;
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grub_digests = digest;
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}
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void
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grub_md_unregister (gcry_md_spec_t *cipher)
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{
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gcry_md_spec_t **ciph;
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for (ciph = &grub_digests; *ciph; ciph = &((*ciph)->next))
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if (*ciph == cipher)
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{
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*ciph = (*ciph)->next;
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break;
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}
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}
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void
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grub_crypto_hash (const gcry_md_spec_t *hash, void *out, const void *in,
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grub_size_t inlen)
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{
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GRUB_PROPERLY_ALIGNED_ARRAY (ctx, GRUB_CRYPTO_MAX_MD_CONTEXT_SIZE);
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if (hash->contextsize > sizeof (ctx))
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grub_fatal ("Too large md context");
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hash->init (&ctx);
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hash->write (&ctx, in, inlen);
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hash->final (&ctx);
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grub_memcpy (out, hash->read (&ctx), hash->mdlen);
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}
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const gcry_md_spec_t *
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grub_crypto_lookup_md_by_name (const char *name)
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{
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const gcry_md_spec_t *md;
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int first = 1;
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while (1)
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{
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for (md = grub_digests; md; md = md->next)
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if (grub_strcasecmp (name, md->name) == 0)
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return md;
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if (grub_crypto_autoload_hook && first)
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grub_crypto_autoload_hook (name);
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else
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return NULL;
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first = 0;
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}
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}
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const gcry_cipher_spec_t *
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grub_crypto_lookup_cipher_by_name (const char *name)
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{
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const gcry_cipher_spec_t *ciph;
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int first = 1;
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while (1)
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{
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for (ciph = grub_ciphers; ciph; ciph = ciph->next)
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{
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const char **alias;
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if (grub_strcasecmp (name, ciph->name) == 0)
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return ciph;
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if (!ciph->aliases)
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continue;
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for (alias = ciph->aliases; *alias; alias++)
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if (grub_strcasecmp (name, *alias) == 0)
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return ciph;
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}
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if (grub_crypto_autoload_hook && first)
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grub_crypto_autoload_hook (name);
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else
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return NULL;
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first = 0;
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}
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}
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grub_crypto_cipher_handle_t
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grub_crypto_cipher_open (const struct gcry_cipher_spec *cipher)
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{
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grub_crypto_cipher_handle_t ret;
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ret = grub_malloc (sizeof (*ret) + cipher->contextsize);
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if (!ret)
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return NULL;
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ret->cipher = cipher;
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return ret;
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}
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gcry_err_code_t
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grub_crypto_cipher_set_key (grub_crypto_cipher_handle_t cipher,
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const unsigned char *key,
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unsigned keylen)
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{
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return cipher->cipher->setkey (cipher->ctx, key, keylen);
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}
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gcry_err_code_t
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grub_crypto_ecb_decrypt (grub_crypto_cipher_handle_t cipher,
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void *out, const void *in, grub_size_t size)
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{
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const grub_uint8_t *inptr, *end;
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grub_uint8_t *outptr;
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if (!cipher->cipher->decrypt)
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return GPG_ERR_NOT_SUPPORTED;
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if (size % cipher->cipher->blocksize != 0)
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return GPG_ERR_INV_ARG;
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end = (const grub_uint8_t *) in + size;
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for (inptr = in, outptr = out; inptr < end;
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inptr += cipher->cipher->blocksize, outptr += cipher->cipher->blocksize)
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cipher->cipher->decrypt (cipher->ctx, outptr, inptr);
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return GPG_ERR_NO_ERROR;
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}
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gcry_err_code_t
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grub_crypto_ecb_encrypt (grub_crypto_cipher_handle_t cipher,
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void *out, const void *in, grub_size_t size)
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{
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const grub_uint8_t *inptr, *end;
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grub_uint8_t *outptr;
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if (!cipher->cipher->encrypt)
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return GPG_ERR_NOT_SUPPORTED;
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if (size % cipher->cipher->blocksize != 0)
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return GPG_ERR_INV_ARG;
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end = (const grub_uint8_t *) in + size;
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for (inptr = in, outptr = out; inptr < end;
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inptr += cipher->cipher->blocksize, outptr += cipher->cipher->blocksize)
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cipher->cipher->encrypt (cipher->ctx, outptr, inptr);
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return GPG_ERR_NO_ERROR;
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}
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gcry_err_code_t
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grub_crypto_cbc_encrypt (grub_crypto_cipher_handle_t cipher,
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void *out, const void *in, grub_size_t size,
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void *iv_in)
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{
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grub_uint8_t *outptr;
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const grub_uint8_t *inptr, *end;
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void *iv;
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if (!cipher->cipher->decrypt)
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return GPG_ERR_NOT_SUPPORTED;
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if (size % cipher->cipher->blocksize != 0)
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return GPG_ERR_INV_ARG;
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end = (const grub_uint8_t *) in + size;
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iv = iv_in;
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for (inptr = in, outptr = out; inptr < end;
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inptr += cipher->cipher->blocksize, outptr += cipher->cipher->blocksize)
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{
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grub_crypto_xor (outptr, inptr, iv, cipher->cipher->blocksize);
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cipher->cipher->encrypt (cipher->ctx, outptr, outptr);
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iv = outptr;
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}
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grub_memcpy (iv_in, iv, cipher->cipher->blocksize);
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return GPG_ERR_NO_ERROR;
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}
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gcry_err_code_t
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grub_crypto_cbc_decrypt (grub_crypto_cipher_handle_t cipher,
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void *out, const void *in, grub_size_t size,
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void *iv)
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{
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const grub_uint8_t *inptr, *end;
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grub_uint8_t *outptr;
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grub_uint8_t ivt[GRUB_CRYPTO_MAX_CIPHER_BLOCKSIZE];
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if (!cipher->cipher->decrypt)
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return GPG_ERR_NOT_SUPPORTED;
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if (size % cipher->cipher->blocksize != 0)
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return GPG_ERR_INV_ARG;
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if (cipher->cipher->blocksize > GRUB_CRYPTO_MAX_CIPHER_BLOCKSIZE)
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return GPG_ERR_INV_ARG;
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end = (const grub_uint8_t *) in + size;
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for (inptr = in, outptr = out; inptr < end;
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inptr += cipher->cipher->blocksize, outptr += cipher->cipher->blocksize)
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{
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grub_memcpy (ivt, inptr, cipher->cipher->blocksize);
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cipher->cipher->decrypt (cipher->ctx, outptr, inptr);
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grub_crypto_xor (outptr, outptr, iv, cipher->cipher->blocksize);
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grub_memcpy (iv, ivt, cipher->cipher->blocksize);
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}
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return GPG_ERR_NO_ERROR;
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}
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/* Based on gcry/cipher/md.c. */
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struct grub_crypto_hmac_handle *
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grub_crypto_hmac_init (const struct gcry_md_spec *md,
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const void *key, grub_size_t keylen)
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{
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grub_uint8_t *helpkey = NULL;
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grub_uint8_t *ipad = NULL, *opad = NULL;
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void *ctx = NULL;
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struct grub_crypto_hmac_handle *ret = NULL;
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unsigned i;
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if (md->mdlen > md->blocksize)
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return NULL;
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ctx = grub_malloc (md->contextsize);
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if (!ctx)
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goto err;
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if ( keylen > md->blocksize )
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{
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helpkey = grub_malloc (md->mdlen);
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if (!helpkey)
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goto err;
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grub_crypto_hash (md, helpkey, key, keylen);
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key = helpkey;
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keylen = md->mdlen;
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}
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ipad = grub_zalloc (md->blocksize);
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if (!ipad)
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goto err;
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opad = grub_zalloc (md->blocksize);
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if (!opad)
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goto err;
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grub_memcpy ( ipad, key, keylen );
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grub_memcpy ( opad, key, keylen );
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for (i=0; i < md->blocksize; i++ )
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{
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ipad[i] ^= 0x36;
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opad[i] ^= 0x5c;
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}
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grub_free (helpkey);
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helpkey = NULL;
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md->init (ctx);
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md->write (ctx, ipad, md->blocksize); /* inner pad */
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grub_memset (ipad, 0, md->blocksize);
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grub_free (ipad);
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ipad = NULL;
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ret = grub_malloc (sizeof (*ret));
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if (!ret)
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goto err;
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ret->md = md;
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ret->ctx = ctx;
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ret->opad = opad;
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return ret;
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err:
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grub_free (helpkey);
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grub_free (ctx);
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grub_free (ipad);
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grub_free (opad);
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return NULL;
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}
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void
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grub_crypto_hmac_write (struct grub_crypto_hmac_handle *hnd,
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const void *data,
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grub_size_t datalen)
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{
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hnd->md->write (hnd->ctx, data, datalen);
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}
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gcry_err_code_t
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grub_crypto_hmac_fini (struct grub_crypto_hmac_handle *hnd, void *out)
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{
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grub_uint8_t *p;
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grub_uint8_t *ctx2;
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ctx2 = grub_malloc (hnd->md->contextsize);
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if (!ctx2)
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return GPG_ERR_OUT_OF_MEMORY;
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hnd->md->final (hnd->ctx);
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hnd->md->read (hnd->ctx);
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p = hnd->md->read (hnd->ctx);
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hnd->md->init (ctx2);
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hnd->md->write (ctx2, hnd->opad, hnd->md->blocksize);
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hnd->md->write (ctx2, p, hnd->md->mdlen);
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hnd->md->final (ctx2);
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grub_memset (hnd->opad, 0, hnd->md->blocksize);
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grub_free (hnd->opad);
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grub_memset (hnd->ctx, 0, hnd->md->contextsize);
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grub_free (hnd->ctx);
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grub_memcpy (out, hnd->md->read (ctx2), hnd->md->mdlen);
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grub_memset (ctx2, 0, hnd->md->contextsize);
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grub_free (ctx2);
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grub_memset (hnd, 0, sizeof (*hnd));
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grub_free (hnd);
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return GPG_ERR_NO_ERROR;
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}
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gcry_err_code_t
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grub_crypto_hmac_buffer (const struct gcry_md_spec *md,
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const void *key, grub_size_t keylen,
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const void *data, grub_size_t datalen, void *out)
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{
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struct grub_crypto_hmac_handle *hnd;
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hnd = grub_crypto_hmac_init (md, key, keylen);
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if (!hnd)
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return GPG_ERR_OUT_OF_MEMORY;
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grub_crypto_hmac_write (hnd, data, datalen);
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return grub_crypto_hmac_fini (hnd, out);
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}
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grub_err_t
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grub_crypto_gcry_error (gcry_err_code_t in)
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{
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if (in == GPG_ERR_NO_ERROR)
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return GRUB_ERR_NONE;
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return GRUB_ACCESS_DENIED;
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}
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int
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grub_crypto_memcmp (const void *a, const void *b, grub_size_t n)
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{
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register grub_size_t counter = 0;
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const grub_uint8_t *pa, *pb;
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for (pa = a, pb = b; n; pa++, pb++, n--)
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{
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if (*pa != *pb)
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counter++;
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}
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return !!counter;
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}
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#ifndef GRUB_UTIL
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int
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grub_password_get (char buf[], unsigned buf_size)
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{
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unsigned cur_len = 0;
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int key;
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while (1)
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{
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key = grub_getkey ();
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if (key == '\n' || key == '\r')
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break;
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if (key == '\e')
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{
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cur_len = 0;
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break;
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}
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if (key == '\b')
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{
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cur_len--;
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continue;
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}
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if (!grub_isprint (key))
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continue;
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if (cur_len + 2 < buf_size)
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buf[cur_len++] = key;
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}
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grub_memset (buf + cur_len, 0, buf_size - cur_len);
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grub_xputs ("\n");
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grub_refresh ();
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return (key != '\e');
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}
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#endif
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