1 files changed, 164 insertions, 0 deletions

diff --git a/src/lib/libcrypto/rsa/rsa_x931.c b/src/lib/libcrypto/rsa/rsa_x931.c
new file mode 100644
index 0000000000..52f3f803b2
--- /dev/null
+++ b/src/lib/libcrypto/rsa/rsa_x931.c
@@ -0,0 +1,164 @@
+/* $OpenBSD: rsa_x931.c,v 1.12 2023/05/05 12:19:37 tb Exp $ */
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project 2005.
+ */
+/* ====================================================================
+ * Copyright (c) 2005 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 <stdio.h>
+#include <string.h>
+
+#include <openssl/bn.h>
+#include <openssl/err.h>
+#include <openssl/objects.h>
+#include <openssl/rsa.h>
+
+int
+RSA_padding_add_X931(unsigned char *to, int tlen, const unsigned char *from,
+    int flen)
+{
+        int j;
+        unsigned char *p;
+
+        /*
+         * Absolute minimum amount of padding is 1 header nibble, 1 padding
+         * nibble and 2 trailer bytes: but 1 hash if is already in 'from'.
+         */
+        j = tlen - flen - 2;
+
+        if (j < 0) {
+                RSAerror(RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
+                return -1;
+        }
+
+        p = (unsigned char *)to;
+
+        /* If no padding start and end nibbles are in one byte */
+        if (j == 0)
+                *p++ = 0x6A;
+        else {
+                *p++ = 0x6B;
+                if (j > 1) {
+                        memset(p, 0xBB, j - 1);
+                        p += j - 1;
+                }
+                *p++ = 0xBA;
+        }
+        memcpy(p, from, flen);
+        p += flen;
+        *p = 0xCC;
+        return 1;
+}
+
+int
+RSA_padding_check_X931(unsigned char *to, int tlen, const unsigned char *from,
+    int flen, int num)
+{
+        int i = 0, j;
+        const unsigned char *p = from;
+
+        if (num != flen || (*p != 0x6A && *p != 0x6B)) {
+                RSAerror(RSA_R_INVALID_HEADER);
+                return -1;
+        }
+
+        if (*p++ == 0x6B) {
+                j = flen - 3;
+                for (i = 0; i < j; i++) {
+                        unsigned char c = *p++;
+                        if (c == 0xBA)
+                                break;
+                        if (c != 0xBB) {
+                                RSAerror(RSA_R_INVALID_PADDING);
+                                return -1;
+                        }
+                }
+
+                if (i == 0) {
+                        RSAerror(RSA_R_INVALID_PADDING);
+                        return -1;
+                }
+
+                j -= i;
+        } else
+                j = flen - 2;
+
+        if (j < 0 || p[j] != 0xCC) {
+                RSAerror(RSA_R_INVALID_TRAILER);
+                return -1;
+        }
+
+        memcpy(to, p, j);
+
+        return j;
+}
+
+/* Translate between X931 hash ids and NIDs */
+
+int
+RSA_X931_hash_id(int nid)
+{
+        switch (nid) {
+        case NID_sha1:
+                return 0x33;
+        case NID_sha256:
+                return 0x34;
+        case NID_sha384:
+                return 0x36;
+        case NID_sha512:
+                return 0x35;
+        }
+
+        return -1;
+}