Imported OpenSSL 1.1.1a

crypto/rsa/rsa_ssl.c

@@ -0,0 +1,108 @@
+/*
+ * Copyright 1995-2018 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 <openssl/bn.h>
+#include <openssl/rsa.h>
+#include <openssl/rand.h>
+
+int RSA_padding_add_SSLv23(unsigned char *to, int tlen,
+                           const unsigned char *from, int flen)
+{
+    int i, j;
+    unsigned char *p;
+
+    if (flen > (tlen - 11)) {
+        RSAerr(RSA_F_RSA_PADDING_ADD_SSLV23,
+               RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
+        return 0;
+    }
+
+    p = (unsigned char *)to;
+
+    *(p++) = 0;
+    *(p++) = 2;                 /* Public Key BT (Block Type) */
+
+    /* pad out with non-zero random data */
+    j = tlen - 3 - 8 - flen;
+
+    if (RAND_bytes(p, j) <= 0)
+        return 0;
+    for (i = 0; i < j; i++) {
+        if (*p == '\0')
+            do {
+                if (RAND_bytes(p, 1) <= 0)
+                    return 0;
+            } while (*p == '\0');
+        p++;
+    }
+
+    memset(p, 3, 8);
+    p += 8;
+    *(p++) = '\0';
+
+    memcpy(p, from, (unsigned int)flen);
+    return 1;
+}
+
+int RSA_padding_check_SSLv23(unsigned char *to, int tlen,
+                             const unsigned char *from, int flen, int num)
+{
+    int i, j, k;
+    const unsigned char *p;
+
+    p = from;
+    if (flen < 10) {
+        RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_DATA_TOO_SMALL);
+        return -1;
+    }
+    /* Accept even zero-padded input */
+    if (flen == num) {
+        if (*(p++) != 0) {
+            RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_BLOCK_TYPE_IS_NOT_02);
+            return -1;
+        }
+        flen--;
+    }
+    if ((num != (flen + 1)) || (*(p++) != 02)) {
+        RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_BLOCK_TYPE_IS_NOT_02);
+        return -1;
+    }
+
+    /* scan over padding data */
+    j = flen - 1;               /* one for type */
+    for (i = 0; i < j; i++)
+        if (*(p++) == 0)
+            break;
+
+    if ((i == j) || (i < 8)) {
+        RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23,
+               RSA_R_NULL_BEFORE_BLOCK_MISSING);
+        return -1;
+    }
+    for (k = -9; k < -1; k++) {
+        if (p[k] != 0x03)
+            break;
+    }
+    if (k == -1) {
+        RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_SSLV3_ROLLBACK_ATTACK);
+        return -1;
+    }
+
+    i++;                        /* Skip over the '\0' */
+    j -= i;
+    if (j > tlen) {
+        RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_DATA_TOO_LARGE);
+        return -1;
+    }
+    memcpy(to, p, (unsigned int)j);
+
+    return j;
+}