linux-kernel - [PATCH] fix negative modulus in rsa testcases

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Message-Id: <20211025065810.87080-1-helei.sig11@bytedance.com>
Date:   Mon, 25 Oct 2021 14:58:10 +0800
From:   Lei He <helei.sig11@...edance.com>
To:     herbert@...dor.apana.org.au
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        pizhenwei@...edance.com, Lei He <helei.sig11@...edance.com>
Subject: [PATCH] fix negative modulus in rsa testcases

according to the BER encoding rules, integer value is encoded as
two's complement, and if the highest bit of a positive integer
is 1, should add an leading zero octet.

this test case will prevent some crypto-drivers that sign sensitive
from passing self-test.

Signed-off-by: Lei He <helei.sig11@...edance.com>
---
 crypto/testmgr.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/crypto/testmgr.h b/crypto/testmgr.h
index 779720bf9364..a253d66ba1c1 100644
--- a/crypto/testmgr.h
+++ b/crypto/testmgr.h
@@ -257,9 +257,9 @@ static const struct akcipher_testvec rsa_tv_template[] = {
 	}, {
 #endif
 	.key =
-	"\x30\x82\x02\x1F" /* sequence of 543 bytes */
+	"\x30\x82\x02\x20" /* sequence of 544 bytes */
 	"\x02\x01\x01" /* version - integer of 1 byte */
-	"\x02\x82\x01\x00" /* modulus - integer of 256 bytes */
+	"\x02\x82\x01\x01\x00" /* modulus - integer of 256 bytes */
 	"\xDB\x10\x1A\xC2\xA3\xF1\xDC\xFF\x13\x6B\xED\x44\xDF\xF0\x02\x6D"
 	"\x13\xC7\x88\xDA\x70\x6B\x54\xF1\xE8\x27\xDC\xC3\x0F\x99\x6A\xFA"
 	"\xC6\x67\xFF\x1D\x1E\x3C\x1D\xC1\xB5\x5F\x6C\xC0\xB2\x07\x3A\x6D"
@@ -299,7 +299,7 @@ static const struct akcipher_testvec rsa_tv_template[] = {
 	"\x02\x01\x00" /* exponent1 - integer of 1 byte */
 	"\x02\x01\x00" /* exponent2 - integer of 1 byte */
 	"\x02\x01\x00", /* coefficient - integer of 1 byte */
-	.key_len = 547,
+	.key_len = 548,
 	.m = "\x54\x85\x9b\x34\x2c\x49\xea\x2a",
 	.c =
 	"\xb2\x97\x76\xb4\xae\x3e\x38\x3c\x7e\x64\x1f\xcc\xa2\x7f\xf6\xbe"
-- 
2.11.0