[PATCH v4 6/6] test: add rsa_verify() unit test

[AKASHI Takahiro <takahiro.akashi@linaro.org>]

On Tue, Jan 14, 2020 at 01:04:58PM +0100, Heinrich Schuchardt wrote:
> On 1/14/20 8:33 AM, AKASHI Takahiro wrote:
> >On Wed, Jan 08, 2020 at 06:43:51PM +0100, Heinrich Schuchardt wrote:
> >>
> >>
> >>On 11/21/19 1:11 AM, AKASHI Takahiro wrote:
> >>>In this patch, a very simple test is added to verify that rsa_verify()
> >>>using rsa_verify_with_pkey() work correctly.
> >>>
> >>>To keep the code simple, all the test data, either public key and
> >>>verified binary data, are embedded in the source.
> >>>
> >>>Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
> >>>---
> >>>  test/Kconfig      |  12 +++
> >>>  test/lib/Makefile |   1 +
> >>>  test/lib/rsa.c    | 206 ++++++++++++++++++++++++++++++++++++++++++++++
> >>>  3 files changed, 219 insertions(+)
> >>>  create mode 100644 test/lib/rsa.c
> >>>
> >>>diff --git a/test/Kconfig b/test/Kconfig
> >>>index cb7954041eda..64d76c3b20a5 100644
> >>>--- a/test/Kconfig
> >>>+++ b/test/Kconfig
> >>>@@ -28,6 +28,18 @@ config UT_LIB_ASN1
> >>>  	  Enables a test which exercises asn1 compiler and decoder function
> >>>  	  via various parsers.
> >>>
> >>>+config UT_LIB_RSA
> >>>+	bool "Unit test for rsa_verify() function"
> >>>+	imply RSA
> >>>+	imply ASYMMETRIC_KEY_TYPE
> >>>+	imply ASYMMETRIC_PUBLIC_KEY_SUBTYPE
> >>>+	imply RSA_PUBLIC_KEY_PARSER
> >>>+	imply RSA_VERIFY_WITH_PKEY
> >>
> >>This test should depend on RSA_VERIFY_WITH_PKEY because is cannot be
> >>executed otherwise.
> >
> >See below.
> >
> >>Best regards
> >>
> >>Heinrich
> >>
> >>>+	default y
> >>>+	help
> >>>+	  Enables rsa_verify() test, currently rsa_verify_with_pkey only()
> >>>+	  only, at the 'ut lib' command.
> >>>+
> >>>  endif
> >>>
> >>>  config UT_TIME
> >>>diff --git a/test/lib/Makefile b/test/lib/Makefile
> >>>index 72d2ec74b5f4..2bf6ef3935bb 100644
> >>>--- a/test/lib/Makefile
> >>>+++ b/test/lib/Makefile
> >>>@@ -8,3 +8,4 @@ obj-y += lmb.o
> >>>  obj-y += string.o
> >>>  obj-$(CONFIG_ERRNO_STR) += test_errno_str.o
> >>>  obj-$(CONFIG_UT_LIB_ASN1) += asn1.o
> >>>+obj-$(CONFIG_UT_LIB_RSA) += rsa.o
> >>>diff --git a/test/lib/rsa.c b/test/lib/rsa.c
> >>>new file mode 100644
> >>>index 000000000000..44f8ade226f4
> >>>--- /dev/null
> >>>+++ b/test/lib/rsa.c
> >>>@@ -0,0 +1,206 @@
> >>>+// SPDX-License-Identifier: GPL-2.0+
> >>>+/*
> >>>+ * Copyright (c) 2019 Linaro Limited
> >>>+ * Author: AKASHI Takahiro
> >>>+ *
> >>>+ * Unit test for rsa_verify() function
> >>>+ */
> >>>+
> >>>+#include <common.h>
> >>>+#include <command.h>
> >>>+#include <image.h>
> >>>+#include <test/lib.h>
> >>>+#include <test/test.h>
> >>>+#include <test/ut.h>
> >>>+#include <u-boot/rsa.h>
> >>>+
> >>>+#ifdef CONFIG_RSA_VERIFY_WITH_PKEY
> >>
> >>Please, remove this ifdef. Simply do not build this module if
> >>CONFIG_RSA_VERIFY_WITH_PKEY is not defined.
> >
> >That is why I added this #ifdef here to avoid a build error.
> >I think it is a good idea to make test code as generic as possible
> >to easily add more test cases.
> 
> It is preferable to move configuration dependencies to the Makefile.
> 
> You can create a new C file if you have tests needing a different
> configuration.
> 
> test/lib/rsa_verify.c might be a better name for the file.
> 
> In test/Kconfig, please, replace
> 
> config UT_LIB_RSA
>         bool "Unit test for rsa_verify() function"
>         imply RSA
> 
> by
> 
> config UT_LIB_RSA
>         bool "Unit test for rsa_verify() function"
> 	default y
>         depends on RSA

Initially in my development code, I did the exact same thing,
but I didn't adopt this approach.

If we follow your proposal, UT_LIB_RSA won't be selected
unless RSA is enabled.
So UT_LIB_RSA won't be executed under most existing configurations
in the current CI.  This was not what I wanted.

What I wanted here is that, if UT (and UT_LIB) is selected, all
the configurations needed for enabling all the test cases be
also selected *automatically*.

I think that this is what Tom implied in his comment.

Thanks,
-Takahiro Akashi


> We run all unit tests in Gitlab CI. This requires default=y.
> 
> 'imply' gives you no guarantee that RSA is selected. See the build
> errors I reported for your other patches in the series.
> 
> Best regards
> 
> Heinrich
> 
> >
> >I believe that the original RSA helper functions (w/o WITH_PKEY)
> >should also be exercised in a unit test. Otherwise, the code
> >will only be exercised indirectly through FIT image verification
> >and such a situation will contradict what Tom (or Heinrich?) demanded
> >against my RSA patch.
> >
> >-Takahiro Akashi
> >
> >>>+/*
> >>>+ * openssl genrsa 2048 -out private.pem
> >>>+ * openssl rsa -in private.pem -pubout -outform der -out public.der
> >>>+ * dd if=public.der of=public.raw bs=24 skip=1
> >>>+ */
> >>>+static unsigned char public_key[] = {
> >>>+	0x30, 0x82, 0x01, 0x0a, 0x02, 0x82, 0x01, 0x01, 0x00, 0xca, 0x25, 0x23,
> >>>+	0xe0, 0x0a, 0x4d, 0x8f, 0x56, 0xfc, 0xc9, 0x06, 0x4c, 0xcc, 0x94, 0x43,
> >>>+	0xe0, 0x56, 0x44, 0x6e, 0x37, 0x54, 0x87, 0x12, 0x84, 0xf9, 0x07, 0x4f,
> >>>+	0xe4, 0x23, 0x40, 0xc3, 0x43, 0x84, 0x37, 0x86, 0xd3, 0x9d, 0x95, 0x1c,
> >>>+	0xe4, 0x8a, 0x66, 0x02, 0x09, 0xe2, 0x3d, 0xce, 0x2c, 0xc6, 0x02, 0x6a,
> >>>+	0xd4, 0x65, 0x61, 0xff, 0x85, 0x6f, 0x88, 0x63, 0xba, 0x31, 0x62, 0x1e,
> >>>+	0xb7, 0x95, 0xe9, 0x08, 0x3c, 0xe9, 0x35, 0xde, 0xfd, 0x65, 0x92, 0xb8,
> >>>+	0x9e, 0x71, 0xa4, 0xcd, 0x47, 0xfd, 0x04, 0x26, 0xb9, 0x78, 0xbf, 0x05,
> >>>+	0x0d, 0xfc, 0x00, 0x84, 0x08, 0xfc, 0xc4, 0x4b, 0xea, 0xf5, 0x97, 0x68,
> >>>+	0x0d, 0x97, 0xd7, 0xff, 0x4f, 0x92, 0x82, 0xd7, 0xbb, 0xef, 0xb7, 0x67,
> >>>+	0x8e, 0x72, 0x54, 0xe8, 0xc5, 0x9e, 0xfd, 0xd8, 0x38, 0xe9, 0xbe, 0x19,
> >>>+	0x37, 0x5b, 0x36, 0x8b, 0xbf, 0x49, 0xa1, 0x59, 0x3a, 0x9d, 0xad, 0x92,
> >>>+	0x08, 0x0b, 0xe3, 0xa4, 0xa4, 0x7d, 0xd3, 0x70, 0xc0, 0xb8, 0xfb, 0xc7,
> >>>+	0xda, 0xd3, 0x19, 0x86, 0x37, 0x9a, 0xcd, 0xab, 0x30, 0x96, 0xab, 0xa4,
> >>>+	0xa2, 0x31, 0xa0, 0x38, 0xfb, 0xbf, 0x85, 0xd3, 0x24, 0x39, 0xed, 0xbf,
> >>>+	0xe1, 0x31, 0xed, 0x6c, 0x39, 0xc1, 0xe5, 0x05, 0x2e, 0x12, 0x30, 0x36,
> >>>+	0x73, 0x5d, 0x62, 0xf3, 0x82, 0xaf, 0x38, 0xc8, 0xca, 0xfa, 0xa1, 0x99,
> >>>+	0x57, 0x3c, 0xe1, 0xc1, 0x7b, 0x05, 0x0b, 0xcc, 0x2e, 0xa9, 0x10, 0xc8,
> >>>+	0x68, 0xbd, 0x27, 0xb6, 0x19, 0x9c, 0xd2, 0xad, 0xb3, 0x1f, 0xca, 0x35,
> >>>+	0x6e, 0x84, 0x23, 0xa1, 0xe9, 0xa4, 0x4c, 0xab, 0x19, 0x09, 0x79, 0x6e,
> >>>+	0x3c, 0x7b, 0x74, 0xfc, 0x33, 0x05, 0xcf, 0xa4, 0x2e, 0xeb, 0x55, 0x60,
> >>>+	0x05, 0xc7, 0xcf, 0x3f, 0x92, 0xac, 0x2d, 0x69, 0x0b, 0x19, 0x16, 0x79,
> >>>+	0x75, 0x02, 0x03, 0x01, 0x00, 0x01
> >>>+};
> >>>+
> >>>+static unsigned int public_key_len = 270;
> >>>+
> >>>+/*
> >>>+ * dd if=/dev/urandom of=data.raw bs=512 count=1
> >>>+ */
> >>>+static unsigned char data_raw[] = {
> >>>+	0x3e, 0x48, 0x6e, 0xef, 0x83, 0xd1, 0x4c, 0xfd, 0x92, 0x47, 0x92, 0xd7,
> >>>+	0xf6, 0x16, 0x25, 0x0a, 0xdf, 0xe2, 0xb6, 0x6c, 0xe7, 0xe0, 0x55, 0xb2,
> >>>+	0x70, 0x66, 0xf0, 0xe5, 0xdc, 0xaf, 0xd3, 0x2e, 0xc1, 0x3e, 0x5c, 0x4b,
> >>>+	0xb5, 0xa7, 0x23, 0x1f, 0x2c, 0xce, 0xf8, 0x83, 0x00, 0x6d, 0xeb, 0xdd,
> >>>+	0x19, 0x71, 0x13, 0xb4, 0xae, 0x5c, 0xa8, 0xae, 0x52, 0xc8, 0xe1, 0x77,
> >>>+	0x9e, 0x98, 0x75, 0xbc, 0xef, 0x36, 0x9f, 0x0c, 0x14, 0xed, 0x1a, 0x0a,
> >>>+	0x4f, 0x6c, 0xa4, 0xb1, 0xbb, 0x0e, 0x43, 0x93, 0x12, 0xfc, 0x2e, 0x82,
> >>>+	0x93, 0x4e, 0xcb, 0xa2, 0xcd, 0x59, 0x3f, 0xc5, 0x11, 0x38, 0x3a, 0x88,
> >>>+	0xc3, 0xcf, 0xf9, 0x61, 0xa8, 0x9e, 0x96, 0xb6, 0xbf, 0xa6, 0x5b, 0x0d,
> >>>+	0xd9, 0xbd, 0x05, 0x4c, 0xbe, 0xed, 0x86, 0xca, 0x10, 0x63, 0x72, 0x75,
> >>>+	0x4b, 0xbd, 0x86, 0x42, 0x30, 0x9d, 0x54, 0x4e, 0x12, 0xda, 0xf4, 0xb4,
> >>>+	0xfd, 0xd9, 0x54, 0x95, 0x8f, 0x83, 0xc2, 0x63, 0x44, 0xdd, 0x96, 0x1a,
> >>>+	0xd0, 0x7c, 0xcf, 0xcb, 0x16, 0xd6, 0xff, 0xa3, 0xbb, 0xeb, 0x24, 0x06,
> >>>+	0xbf, 0x81, 0xd0, 0x29, 0x76, 0x19, 0x66, 0x84, 0xfc, 0x49, 0xde, 0x7b,
> >>>+	0x5d, 0xd2, 0x27, 0x58, 0x21, 0x7b, 0xff, 0x4d, 0x64, 0xf3, 0x89, 0xe3,
> >>>+	0xea, 0xb6, 0x54, 0x4e, 0xb1, 0x62, 0x52, 0x89, 0xe3, 0x22, 0xf2, 0x26,
> >>>+	0x3e, 0x4f, 0x43, 0x58, 0x78, 0x91, 0x55, 0xbc, 0x1e, 0xd6, 0x97, 0xfc,
> >>>+	0x0b, 0x85, 0x4c, 0x92, 0x9c, 0xbf, 0xc4, 0xb1, 0x62, 0x93, 0x27, 0xa9,
> >>>+	0xb2, 0xf4, 0xb4, 0x7a, 0xfb, 0x56, 0xe5, 0x8f, 0xe1, 0x94, 0x4d, 0xfd,
> >>>+	0xe4, 0x72, 0x8d, 0xa9, 0x71, 0x65, 0xcb, 0x2e, 0x6d, 0x39, 0xd5, 0x95,
> >>>+	0xe7, 0x3f, 0xab, 0xaa, 0x7a, 0x74, 0x84, 0x25, 0x4b, 0x42, 0x1e, 0xd3,
> >>>+	0x86, 0xca, 0x47, 0x4a, 0xf0, 0x24, 0x81, 0x24, 0xb0, 0xe1, 0xbb, 0x6c,
> >>>+	0x3f, 0x2a, 0xa0, 0xb8, 0xeb, 0xd6, 0x01, 0xce, 0x63, 0x51, 0xe1, 0x81,
> >>>+	0xd2, 0x32, 0x43, 0x56, 0x44, 0x4a, 0x6b, 0x51, 0x24, 0xa2, 0xc7, 0x39,
> >>>+	0x7c, 0x54, 0xda, 0xf8, 0xd4, 0x93, 0x7c, 0x8e, 0x4e, 0x9d, 0x15, 0x08,
> >>>+	0xce, 0x27, 0xd8, 0x28, 0xb0, 0x5b, 0x75, 0x32, 0x43, 0xe8, 0xd6, 0xbf,
> >>>+	0x12, 0xd5, 0xc5, 0x12, 0x8e, 0xeb, 0x77, 0x8f, 0x00, 0xde, 0x45, 0x1e,
> >>>+	0xdd, 0xf3, 0xef, 0x43, 0x99, 0x79, 0x86, 0xea, 0x01, 0xce, 0xf2, 0x4d,
> >>>+	0xa0, 0xfe, 0x5a, 0x55, 0xc0, 0x1f, 0xce, 0xe8, 0xbe, 0xc2, 0x66, 0xdb,
> >>>+	0xcb, 0x3f, 0xa5, 0x48, 0xa1, 0xe2, 0x49, 0xa1, 0x29, 0x65, 0x5b, 0x62,
> >>>+	0x39, 0xcc, 0xef, 0xbe, 0x86, 0xb7, 0xe3, 0x44, 0x67, 0x04, 0x04, 0xb1,
> >>>+	0xec, 0xd8, 0xb2, 0xb2, 0x38, 0xbc, 0x10, 0xea, 0x7a, 0x0e, 0xa4, 0xa4,
> >>>+	0xcb, 0x21, 0xd9, 0xc7, 0xb4, 0x0b, 0xb8, 0x39, 0xb4, 0x07, 0x53, 0x3f,
> >>>+	0xb9, 0x55, 0x55, 0xa1, 0x6f, 0x11, 0x49, 0xc0, 0x94, 0x77, 0xaf, 0x76,
> >>>+	0x97, 0x7f, 0x31, 0x08, 0xdd, 0x72, 0x48, 0x72, 0xf8, 0x11, 0x4f, 0x69,
> >>>+	0x10, 0xef, 0x23, 0x06, 0xf3, 0x34, 0xac, 0xee, 0x97, 0x89, 0x41, 0x1c,
> >>>+	0x36, 0x38, 0xb1, 0x80, 0x96, 0x7a, 0x9e, 0x72, 0xab, 0x25, 0xeb, 0xce,
> >>>+	0x7b, 0xb8, 0x5d, 0xc8, 0xef, 0xa4, 0x73, 0xa1, 0xa6, 0x8f, 0x01, 0x54,
> >>>+	0xce, 0x58, 0x19, 0xe5, 0x7e, 0xfa, 0x77, 0x08, 0x9d, 0x53, 0xc1, 0xcc,
> >>>+	0x08, 0xe8, 0x1d, 0xe0, 0x82, 0x5e, 0xe1, 0xe6, 0xbd, 0xbb, 0x59, 0x7e,
> >>>+	0x12, 0x9c, 0x39, 0x60, 0x23, 0xf7, 0xbe, 0x0a, 0x7c, 0x48, 0x12, 0xa0,
> >>>+	0x84, 0x04, 0x3f, 0xa1, 0x6e, 0x92, 0xcd, 0xa0, 0xac, 0xee, 0x0b, 0xbc,
> >>>+	0x18, 0x30, 0x28, 0xbd, 0xf5, 0xfa, 0x3a, 0x35
> >>>+};
> >>>+
> >>>+static unsigned int data_raw_len = 512;
> >>>+
> >>>+/*
> >>>+ * openssl dgst -sha256 -sign private.key -out data.enc data.raw
> >>>+ */
> >>>+unsigned char data_enc[] = {
> >>>+	0xa7, 0x4a, 0x12, 0x8f, 0xee, 0x65, 0x4b, 0xcd, 0x88, 0xca, 0x4d, 0xed,
> >>>+	0xe3, 0x04, 0xe7, 0x7c, 0x59, 0xbf, 0x2f, 0xad, 0x95, 0x73, 0x5b, 0x2c,
> >>>+	0x4e, 0xb5, 0xda, 0x5e, 0x3a, 0x6d, 0xb4, 0xc5, 0x84, 0x0c, 0xd2, 0x4a,
> >>>+	0x62, 0x0d, 0x5f, 0xba, 0x10, 0xee, 0xb1, 0x2a, 0xe1, 0xfe, 0x50, 0x18,
> >>>+	0x97, 0xcc, 0xea, 0x26, 0x62, 0x33, 0x5a, 0x1d, 0x51, 0x38, 0x52, 0x89,
> >>>+	0x4d, 0xa7, 0x18, 0xff, 0xa6, 0xc8, 0xd4, 0x7a, 0xc0, 0xa6, 0x22, 0xdf,
> >>>+	0x41, 0x89, 0x93, 0x9b, 0xe7, 0x9e, 0xc1, 0xc8, 0x80, 0xda, 0x1a, 0x3f,
> >>>+	0xa4, 0x7a, 0xd0, 0x07, 0xcb, 0x5c, 0xa4, 0x75, 0x12, 0x54, 0x78, 0x67,
> >>>+	0xbf, 0xe6, 0xae, 0x1e, 0x56, 0x33, 0x9e, 0xe0, 0x6e, 0x33, 0xa7, 0x58,
> >>>+	0xb0, 0x47, 0x49, 0xa8, 0x37, 0xdb, 0x82, 0x4b, 0xbd, 0x32, 0x9c, 0xdc,
> >>>+	0xf4, 0x67, 0x17, 0x24, 0x55, 0xfd, 0x83, 0x1e, 0xc8, 0xb4, 0x5c, 0xf9,
> >>>+	0x15, 0x6c, 0x5e, 0xaa, 0x72, 0x03, 0x9e, 0x7c, 0x17, 0xf5, 0x7c, 0x37,
> >>>+	0x96, 0x00, 0xb0, 0xd8, 0xaa, 0x05, 0xfa, 0xaa, 0xa1, 0x78, 0x77, 0xd5,
> >>>+	0x09, 0xdd, 0x05, 0xc7, 0xe2, 0x9f, 0x68, 0xc7, 0xf8, 0xfb, 0x0b, 0x6f,
> >>>+	0x18, 0x1e, 0xcc, 0x93, 0xd3, 0x3f, 0xc9, 0x26, 0x29, 0x64, 0xe7, 0x15,
> >>>+	0xdc, 0xb8, 0x19, 0x10, 0x24, 0x55, 0x55, 0x3b, 0x79, 0xa1, 0x65, 0x12,
> >>>+	0xe0, 0x0b, 0x88, 0x44, 0x4c, 0xea, 0x85, 0x5a, 0x6b, 0x2d, 0x45, 0x6e,
> >>>+	0xe7, 0x83, 0x6f, 0x3a, 0xaa, 0x1e, 0xf1, 0x9c, 0x8f, 0xdc, 0xb9, 0x37,
> >>>+	0xa2, 0x15, 0x61, 0x93, 0x06, 0x23, 0xf5, 0xfe, 0xf0, 0xf8, 0x2b, 0xf7,
> >>>+	0xc0, 0x68, 0x67, 0xf6, 0x4e, 0x08, 0x0d, 0x0d, 0x08, 0xbe, 0xfb, 0x2c,
> >>>+	0x4c, 0xe7, 0xd7, 0x1a, 0xad, 0xd9, 0x98, 0xa1, 0x8d, 0x94, 0x1c, 0xd1,
> >>>+	0x89, 0x06, 0xc9, 0x3a
> >>>+};
> >>>+
> >>>+static unsigned int data_enc_len = 256;
> >>>+
> >>>+/**
> >>>+ * lib_rsa_verify_valid() - unit test for rsa_verify()
> >>>+ *
> >>>+ * Test rsa_verify() with valid hash
> >>>+ *
> >>>+ * @uts:	unit test state
> >>>+ * Return:	0 = success, 1 = failure
> >>>+ */
> >>>+static int lib_rsa_verify_valid(struct unit_test_state *uts)
> >>>+{
> >>>+	struct image_sign_info info;
> >>>+	struct image_region reg;
> >>>+	int ret;
> >>>+
> >>>+	memset(&info, '\0', sizeof(info));
> >>>+	info.name = "sha256,rsa2048";
> >>>+	info.padding = image_get_padding_algo("pkcs-1.5");
> >>>+	info.checksum = image_get_checksum_algo("sha256,rsa2048");
> >>>+	info.crypto = image_get_crypto_algo(info.name);
> >>>+
> >>>+	info.key = public_key;
> >>>+	info.keylen = public_key_len;
> >>>+
> >>>+	reg.data = data_raw;
> >>>+	reg.size = data_raw_len;
> >>>+	ret = rsa_verify(&info, &reg, 1, data_enc, data_enc_len);
> >>>+	ut_assertf(ret == 0, "verification unexpectedly failed (%d)\n", ret);
> >>>+
> >>>+	return CMD_RET_SUCCESS;
> >>>+}
> >>>+
> >>>+LIB_TEST(lib_rsa_verify_valid, 0);
> >>>+
> >>>+/**
> >>>+ * lib_rsa_verify_invalid() - unit test for rsa_verify()
> >>>+ *
> >>>+ * Test rsa_verify() with invalid hash
> >>>+ *
> >>>+ * @uts:	unit test state
> >>>+ * Return:	0 = success, 1 = failure
> >>>+ */
> >>>+static int lib_rsa_verify_invalid(struct unit_test_state *uts)
> >>>+{
> >>>+	struct image_sign_info info;
> >>>+	struct image_region reg;
> >>>+	unsigned char ctmp;
> >>>+	int ret;
> >>>+
> >>>+	memset(&info, '\0', sizeof(info));
> >>>+	info.name = "sha256,rsa2048";
> >>>+	info.padding = image_get_padding_algo("pkcs-1.5");
> >>>+	info.checksum = image_get_checksum_algo("sha256,rsa2048");
> >>>+	info.crypto = image_get_crypto_algo(info.name);
> >>>+
> >>>+	info.key = public_key;
> >>>+	info.keylen = public_key_len;
> >>>+
> >>>+	/* randomly corrupt enc'ed data */
> >>>+	ctmp = data_enc[data_enc_len - 10];
> >>>+	data_enc[data_enc_len - 10] = 0x12;
> >>>+
> >>>+	reg.data = data_raw;
> >>>+	reg.size = data_raw_len;
> >>>+	ret = rsa_verify(&info, &reg, 1, data_enc, data_enc_len);
> >>>+
> >>>+	/* revert a change */
> >>>+	data_enc[data_enc_len - 10] = ctmp;
> >>>+
> >>>+	ut_assertf(ret != 0, "verification unexpectedly succeeded\n");
> >>>+
> >>>+	return CMD_RET_SUCCESS;
> >>>+}
> >>>+
> >>>+LIB_TEST(lib_rsa_verify_invalid, 0);
> >>>+#endif /* RSA_VERIFY_WITH_PKEY */
> >>>
> >
>