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[PATCH v5 2/5] Import b64dec from gpg-error
From: |
Vladimir Serbinenko |
Subject: |
[PATCH v5 2/5] Import b64dec from gpg-error |
Date: |
Tue, 3 Sep 2024 20:29:31 +0300 |
Base on libgpg-error 1.49 but with modifications to make it compile
in GRUB environment
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
---
grub-core/lib/b64dec.c | 293 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 293 insertions(+)
create mode 100644 grub-core/lib/b64dec.c
diff --git a/grub-core/lib/b64dec.c b/grub-core/lib/b64dec.c
new file mode 100644
index 000000000..8aafa9700
--- /dev/null
+++ b/grub-core/lib/b64dec.c
@@ -0,0 +1,293 @@
+/* b64dec.c - Simple Base64 decoder.
+ * Copyright (C) 2008, 2011 Free Software Foundation, Inc.
+ * Copyright (C) 2008, 2011, 2016 g10 Code GmbH
+ *
+ * This file is part of Libgpg-error.
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This file is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * This file was originally a part of GnuPG.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <grub/crypto.h>
+
+struct _gpgrt_b64state
+{
+ int idx;
+ int quad_count;
+ char *title;
+ unsigned char radbuf[4];
+ unsigned int crc;
+ gpg_err_code_t lasterr;
+ unsigned int flags;
+ unsigned int stop_seen:1;
+ unsigned int invalid_encoding:1;
+ unsigned int using_decoder:1;
+};
+
+
+/* The reverse base-64 list used for base-64 decoding. */
+static unsigned char const asctobin[128] =
+ {
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f,
+ 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b,
+ 0x3c, 0x3d, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
+ 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
+ 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
+ 0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
+ 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
+ 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
+ 0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff
+ };
+
+enum decoder_states
+ {
+ s_init, s_idle, s_lfseen, s_beginseen, s_waitheader, s_waitblank, s_begin,
+ s_b64_0, s_b64_1, s_b64_2, s_b64_3,
+ s_waitendtitle, s_waitend
+ };
+
+
+
+/* Allocate and initialize the context for the base64 decoder. If
+ TITLE is NULL a plain base64 decoding is done. If it is the empty
+ string the decoder will skip everything until a "-----BEGIN " line
+ has been seen, decoding ends at a "----END " line. */
+gpgrt_b64state_t
+gpgrt_b64dec_start (const char *title)
+{
+ gpgrt_b64state_t state;
+ char *t = NULL;
+
+ if (title)
+ {
+ t = grub_strdup (title);
+ if (!t)
+ return NULL;
+ }
+
+ state = grub_calloc (1, sizeof (struct _gpgrt_b64state));
+ if (!state)
+ {
+ grub_free (t);
+ return NULL;
+ }
+
+ if (t)
+ {
+ state->title = t;
+ state->idx = s_init;
+ }
+ else
+ state->idx = s_b64_0;
+
+ state->using_decoder = 1;
+
+ return state;
+}
+
+
+/* Do in-place decoding of base-64 data of LENGTH in BUFFER. Stores the
+ new length of the buffer at R_NBYTES. */
+gpg_err_code_t
+gpgrt_b64dec_proc (gpgrt_b64state_t state, void *buffer, size_t length,
+ size_t *r_nbytes)
+{
+ enum decoder_states ds = state->idx;
+ unsigned char val = state->radbuf[0];
+ int pos = state->quad_count;
+ char *d, *s;
+
+ if (state->lasterr)
+ return state->lasterr;
+
+ if (state->stop_seen)
+ {
+ *r_nbytes = 0;
+ state->lasterr = GPG_ERR_EOF;
+ grub_free (state->title);
+ state->title = NULL;
+ return state->lasterr;
+ }
+
+ for (s=d=buffer; length && !state->stop_seen; length--, s++)
+ {
+ again:
+ switch (ds)
+ {
+ case s_idle:
+ if (*s == '\n')
+ {
+ ds = s_lfseen;
+ pos = 0;
+ }
+ break;
+ case s_init:
+ ds = s_lfseen;
+ /* Fall through */
+ case s_lfseen:
+ if (*s != "-----BEGIN "[pos])
+ {
+ ds = s_idle;
+ goto again;
+ }
+ else if (pos == 10)
+ {
+ pos = 0;
+ ds = s_beginseen;
+ }
+ else
+ pos++;
+ break;
+ case s_beginseen:
+ if (*s != "PGP "[pos])
+ ds = s_begin; /* Not a PGP armor. */
+ else if (pos == 3)
+ ds = s_waitheader;
+ else
+ pos++;
+ break;
+ case s_waitheader:
+ if (*s == '\n')
+ ds = s_waitblank;
+ break;
+ case s_waitblank:
+ if (*s == '\n')
+ ds = s_b64_0; /* blank line found. */
+ else if (*s == ' ' || *s == '\r' || *s == '\t')
+ ; /* Ignore spaces. */
+ else
+ {
+ /* Armor header line. Note that we don't care that our
+ * FSM accepts a header prefixed with spaces. */
+ ds = s_waitheader; /* Wait for next header. */
+ }
+ break;
+ case s_begin:
+ if (*s == '\n')
+ ds = s_b64_0;
+ break;
+ case s_b64_0:
+ case s_b64_1:
+ case s_b64_2:
+ case s_b64_3:
+ {
+ int c;
+
+ if (*s == '-' && state->title)
+ {
+ /* Not a valid Base64 character: assume end
+ header. */
+ ds = s_waitend;
+ }
+ else if (*s == '=')
+ {
+ /* Pad character: stop */
+ if (ds == s_b64_1)
+ *d++ = val;
+ ds = state->title? s_waitendtitle : s_waitend;
+ }
+ else if (*s == '\n' || *s == ' ' || *s == '\r' || *s == '\t')
+ ; /* Skip white spaces. */
+ else if ( (*s & 0x80)
+ || (c = asctobin[*(unsigned char *)s]) == 255)
+ {
+ /* Skip invalid encodings. */
+ state->invalid_encoding = 1;
+ }
+ else if (ds == s_b64_0)
+ {
+ val = c << 2;
+ ds = s_b64_1;
+ }
+ else if (ds == s_b64_1)
+ {
+ val |= (c>>4)&3;
+ *d++ = val;
+ val = (c<<4)&0xf0;
+ ds = s_b64_2;
+ }
+ else if (ds == s_b64_2)
+ {
+ val |= (c>>2)&15;
+ *d++ = val;
+ val = (c<<6)&0xc0;
+ ds = s_b64_3;
+ }
+ else
+ {
+ val |= c&0x3f;
+ *d++ = val;
+ ds = s_b64_0;
+ }
+ }
+ break;
+ case s_waitendtitle:
+ if (*s == '-')
+ ds = s_waitend;
+ break;
+ case s_waitend:
+ if ( *s == '\n')
+ state->stop_seen = 1;
+ break;
+ default:
+ grub_fatal ("invalid state");
+ }
+ }
+
+
+ state->idx = ds;
+ state->radbuf[0] = val;
+ state->quad_count = pos;
+ *r_nbytes = (d -(char*) buffer);
+ return 0;
+}
+
+
+/* Return an error code in case an encoding error has been found
+ during decoding. */
+gpg_err_code_t
+gpgrt_b64dec_finish (gpgrt_b64state_t state)
+{
+ gpg_error_t err;
+
+ if (!state)
+ return 0; /* Already released. */
+
+ if (!state->using_decoder)
+ err = GPG_ERR_CONFLICT; /* State was allocated for the encoder. */
+ else if (state->lasterr)
+ err = state->lasterr;
+ else
+ {
+ grub_free (state->title);
+ err = state->invalid_encoding? GPG_ERR_BAD_DATA : 0;
+ }
+ grub_free (state);
+
+ return err;
+}
--
2.39.2
- [PATCH v5 1/5] Import libgcrypt 1.10.3, Vladimir Serbinenko, 2024/09/03
- [PATCH v5 2/5] Import b64dec from gpg-error,
Vladimir Serbinenko <=
- [PATCH v5 4/5] Add DSA and RSA SEXP tests, Vladimir Serbinenko, 2024/09/03
- [PATCH v5 5/5] keccak: Disable acceleration with SSE asm, Vladimir Serbinenko, 2024/09/03
- [PATCH v5 3/5] Adjust import script, definitions and API users for libgcrypt 1.10, Vladimir Serbinenko, 2024/09/03
- Re: [PATCH v5 1/5] Import libgcrypt 1.10.3, Daniel Kiper, 2024/09/05