[dpdk-dev] [PATCH v3 10/11] test: add pkcs1_5 padding simulation

[Arek Kusztal]

This patch adds function to simulate pkcs1_5 padding, it serves nothing
else than example. It provides no security and should not be used in
security context.

Signed-off-by: Arek Kusztal <arkadiuszx.kusz...@intel.com>
---
 app/test/test_cryptodev_asym_util.h | 54 +++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/app/test/test_cryptodev_asym_util.h 
b/app/test/test_cryptodev_asym_util.h
index b3d9fb4..f984166 100644
--- a/app/test/test_cryptodev_asym_util.h
+++ b/app/test/test_cryptodev_asym_util.h
@@ -1,10 +1,64 @@
 /* SPDX-License-Identifier: BSD-3-Clause
  * Copyright(c) 2018 Cavium Networks
+ * Copyright (c) 2019 Intel Corporation
  */
 
 #ifndef TEST_CRYPTODEV_ASYM_TEST_UTIL_H__
 #define TEST_CRYPTODEV_ASYM_TEST_UTIL_H__
 
+/*
+ * Two functions below simulate pkcs 1.5 padding and serves only as an example,
+ * both offer no security.
+ */
+static inline int rsa_simulate_pkcs1_5_padding(int op, uint8_t *p,
+               int key_size, const uint8_t *src, int len) {
+
+       int ps_len;
+
+       if (len > key_size - 11)
+               return -1;
+       ps_len = key_size - len - 3;
+
+       *(p++) = 0;
+       *(p++) = op ? 1 : 2;
+       if (op) {
+               while (ps_len--)
+                       *(p++) = 0xFF;
+       } else {
+               while (ps_len--) {
+                       *p = (uint8_t)rand();
+                       *p ^= !(*p);
+                       p++;
+               }
+       }
+
+       *(p++) = 0;
+       memcpy(p, src, len);
+
+       return 0;
+}
+
+static inline int rsa_simulate_strip_pkcs1_5_padding(uint8_t *src,
+               int key_size) {
+       uint8_t tmp[key_size], *orig_src = src;
+       int i = 1;
+       ++src;
+       while (*(src) && i < key_size) {
+               ++i;
+               ++src;
+       }
+       if (i == key_size)
+               return -1;
+
+       ++i;
+       ++src;
+
+       memcpy(tmp, src, key_size - i);
+       memcpy(orig_src, tmp, key_size - i);
+       return key_size - i;
+}
+
+
 /* Below Apis compare resulted buffer to original test vector */
 
 static inline int rsa_verify(struct rsa_test_data *rsa_param,
-- 
2.1.0