From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 21:33:14 +0200
Subject: Adding upstream version 115.7.0esr.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 security/nss/lib/util/derdec.c | 189 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 189 insertions(+)
 create mode 100644 security/nss/lib/util/derdec.c

(limited to 'security/nss/lib/util/derdec.c')

diff --git a/security/nss/lib/util/derdec.c b/security/nss/lib/util/derdec.c
new file mode 100644
index 0000000000..2e3312b231
--- /dev/null
+++ b/security/nss/lib/util/derdec.c
@@ -0,0 +1,189 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "secder.h"
+#include "secerr.h"
+
+static PRUint32
+der_indefinite_length(unsigned char *buf, unsigned char *end)
+{
+    PRUint32 len, ret, dataLen;
+    unsigned char tag, lenCode;
+    int dataLenLen;
+
+    len = 0;
+    while (1) {
+        if ((buf + 2) > end) {
+            return (0);
+        }
+
+        tag = *buf++;
+        lenCode = *buf++;
+        len += 2;
+
+        if ((tag == 0) && (lenCode == 0)) {
+            return (len);
+        }
+
+        if (lenCode == 0x80) {                     /* indefinite length */
+            ret = der_indefinite_length(buf, end); /* recurse to find length */
+            if (ret == 0)
+                return 0;
+            len += ret;
+            buf += ret;
+        } else { /* definite length */
+            if (lenCode & 0x80) {
+                /* Length of data is in multibyte format */
+                dataLenLen = lenCode & 0x7f;
+                switch (dataLenLen) {
+                    case 1:
+                        dataLen = buf[0];
+                        break;
+                    case 2:
+                        dataLen = (buf[0] << 8) | buf[1];
+                        break;
+                    case 3:
+                        dataLen = ((unsigned long)buf[0] << 16) | (buf[1] << 8) | buf[2];
+                        break;
+                    case 4:
+                        dataLen = ((unsigned long)buf[0] << 24) |
+                                  ((unsigned long)buf[1] << 16) | (buf[2] << 8) | buf[3];
+                        break;
+                    default:
+                        PORT_SetError(SEC_ERROR_BAD_DER);
+                        return SECFailure;
+                }
+            } else {
+                /* Length of data is in single byte */
+                dataLen = lenCode;
+                dataLenLen = 0;
+            }
+
+            /* skip this item */
+            buf = buf + dataLenLen + dataLen;
+            len = len + dataLenLen + dataLen;
+        }
+    }
+}
+
+/*
+** Capture the next thing in the buffer.
+** Returns the length of the header and the length of the contents.
+*/
+static SECStatus
+der_capture(unsigned char *buf, unsigned char *end,
+            int *header_len_p, PRUint32 *contents_len_p)
+{
+    unsigned char *bp;
+    unsigned char whole_tag;
+    PRUint32 contents_len;
+    int tag_number;
+
+    if ((buf + 2) > end) {
+        *header_len_p = 0;
+        *contents_len_p = 0;
+        if (buf == end)
+            return SECSuccess;
+        return SECFailure;
+    }
+
+    bp = buf;
+
+    /* Get tag and verify that it is ok. */
+    whole_tag = *bp++;
+    tag_number = whole_tag & DER_TAGNUM_MASK;
+
+    /*
+     * XXX This code does not (yet) handle the high-tag-number form!
+     */
+    if (tag_number == DER_HIGH_TAG_NUMBER) {
+        PORT_SetError(SEC_ERROR_BAD_DER);
+        return SECFailure;
+    }
+
+    if ((whole_tag & DER_CLASS_MASK) == DER_UNIVERSAL) {
+        /* Check that the universal tag number is one we implement.  */
+        switch (tag_number) {
+            case DER_BOOLEAN:
+            case DER_INTEGER:
+            case DER_BIT_STRING:
+            case DER_OCTET_STRING:
+            case DER_NULL:
+            case DER_OBJECT_ID:
+            case DER_SEQUENCE:
+            case DER_SET:
+            case DER_PRINTABLE_STRING:
+            case DER_T61_STRING:
+            case DER_IA5_STRING:
+            case DER_VISIBLE_STRING:
+            case DER_UTC_TIME:
+            case 0: /* end-of-contents tag */
+                break;
+            default:
+                PORT_SetError(SEC_ERROR_BAD_DER);
+                return SECFailure;
+        }
+    }
+
+    /*
+     * Get first byte of length code (might contain entire length, might not).
+     */
+    contents_len = *bp++;
+
+    /*
+     * If the high bit is set, then the length is in multibyte format,
+     * or the thing has an indefinite-length.
+     */
+    if (contents_len & 0x80) {
+        int bytes_of_encoded_len;
+
+        bytes_of_encoded_len = contents_len & 0x7f;
+        contents_len = 0;
+
+        switch (bytes_of_encoded_len) {
+            case 4:
+                contents_len |= *bp++;
+                contents_len <<= 8;
+            /* fallthru */
+            case 3:
+                contents_len |= *bp++;
+                contents_len <<= 8;
+            /* fallthru */
+            case 2:
+                contents_len |= *bp++;
+                contents_len <<= 8;
+            /* fallthru */
+            case 1:
+                contents_len |= *bp++;
+                break;
+
+            case 0:
+                contents_len = der_indefinite_length(bp, end);
+                if (contents_len)
+                    break;
+            /* fallthru */
+            default:
+                PORT_SetError(SEC_ERROR_BAD_DER);
+                return SECFailure;
+        }
+    }
+
+    if ((bp + contents_len) > end) {
+        /* Ran past end of buffer */
+        PORT_SetError(SEC_ERROR_BAD_DER);
+        return SECFailure;
+    }
+
+    *header_len_p = (int)(bp - buf);
+    *contents_len_p = contents_len;
+
+    return SECSuccess;
+}
+
+SECStatus
+DER_Lengths(SECItem *item, int *header_len_p, PRUint32 *contents_len_p)
+{
+    return (der_capture(item->data, &item->data[item->len], header_len_p,
+                        contents_len_p));
+}
-- 
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