From aa4d426b4d3527d7e166df1a05058c9a4a0f6683 Mon Sep 17 00:00:00 2001
From: Wojtek Kosior <wk@koszkonutek-tmp.pl.eu.org>
Date: Fri, 30 Apr 2021 00:33:56 +0200
Subject: initial/final commit

---
 openssl-1.1.0h/crypto/bn/bn_mpi.c | 86 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 openssl-1.1.0h/crypto/bn/bn_mpi.c

(limited to 'openssl-1.1.0h/crypto/bn/bn_mpi.c')

diff --git a/openssl-1.1.0h/crypto/bn/bn_mpi.c b/openssl-1.1.0h/crypto/bn/bn_mpi.c
new file mode 100644
index 0000000..043e21d
--- /dev/null
+++ b/openssl-1.1.0h/crypto/bn/bn_mpi.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <stdio.h>
+#include "internal/cryptlib.h"
+#include "bn_lcl.h"
+
+int BN_bn2mpi(const BIGNUM *a, unsigned char *d)
+{
+    int bits;
+    int num = 0;
+    int ext = 0;
+    long l;
+
+    bits = BN_num_bits(a);
+    num = (bits + 7) / 8;
+    if (bits > 0) {
+        ext = ((bits & 0x07) == 0);
+    }
+    if (d == NULL)
+        return (num + 4 + ext);
+
+    l = num + ext;
+    d[0] = (unsigned char)(l >> 24) & 0xff;
+    d[1] = (unsigned char)(l >> 16) & 0xff;
+    d[2] = (unsigned char)(l >> 8) & 0xff;
+    d[3] = (unsigned char)(l) & 0xff;
+    if (ext)
+        d[4] = 0;
+    num = BN_bn2bin(a, &(d[4 + ext]));
+    if (a->neg)
+        d[4] |= 0x80;
+    return (num + 4 + ext);
+}
+
+BIGNUM *BN_mpi2bn(const unsigned char *d, int n, BIGNUM *ain)
+{
+    long len;
+    int neg = 0;
+    BIGNUM *a = NULL;
+
+    if (n < 4) {
+        BNerr(BN_F_BN_MPI2BN, BN_R_INVALID_LENGTH);
+        return NULL;
+    }
+    len = ((long)d[0] << 24) | ((long)d[1] << 16) | ((int)d[2] << 8) | (int)
+        d[3];
+    if ((len + 4) != n) {
+        BNerr(BN_F_BN_MPI2BN, BN_R_ENCODING_ERROR);
+        return NULL;
+    }
+
+    if (ain == NULL)
+        a = BN_new();
+    else
+        a = ain;
+
+    if (a == NULL)
+        return NULL;
+
+    if (len == 0) {
+        a->neg = 0;
+        a->top = 0;
+        return a;
+    }
+    d += 4;
+    if ((*d) & 0x80)
+        neg = 1;
+    if (BN_bin2bn(d, (int)len, a) == NULL) {
+        if (ain == NULL)
+            BN_free(a);
+        return NULL;
+    }
+    a->neg = neg;
+    if (neg) {
+        BN_clear_bit(a, BN_num_bits(a) - 1);
+    }
+    bn_check_top(a);
+    return a;
+}
-- 
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