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Accepting request 748778 from devel:openSUSE:Factory

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OBS-URL: https://build.opensuse.org/request/show/748778
OBS-URL: https://build.opensuse.org/package/show/openSUSE:Factory/libica?expand=0&rev=17
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Dominique Leuenberger 2019-11-15 21:38:04 +00:00 committed by Git OBS Bridge
commit 165e502774
3 changed files with 138 additions and 0 deletions
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131
libica-sles15sp2-x25519-x448-fix-handling-of-non-canonical-values.patch Normal file
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@ -0,0 +1,131 @@
From a3b36ef136e304a1e2dc12ef7b96686202cbd00d Mon Sep 17 00:00:00 2001
From: Patrick Steuer <patrick.steuer@de.ibm.com>
Date: Wed, 13 Nov 2019 17:12:43 +0100
Subject: [PATCH] x25519,x448: fix handling of non-canonical values
Reduce the peer public key's u-coordinate if it is >= p.
Signed-off-by: Patrick Steuer <patrick.steuer@de.ibm.com>
---
src/s390_ecc.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 91 insertions(+)
diff --git a/src/s390_ecc.c b/src/s390_ecc.c
index 7654959..62799ee 100644
--- a/src/s390_ecc.c
+++ b/src/s390_ecc.c
@@ -557,6 +557,91 @@ struct { \
return rc;
}
+/*
+ * mask must be 0xFF or 0x00.
+ * "constant time" is per len.
+ *
+ * if (mask) {
+ * unsigned char tmp[len];
+ *
+ * memcpy(tmp, a, len);
+ * memcpy(a, b);
+ * memcpy(b, tmp);
+ * }
+ */
+static inline void constant_time_cond_swap_buff(unsigned char mask,
+ unsigned char *a,
+ unsigned char *b,
+ size_t len)
+{
+ size_t i;
+ unsigned char tmp;
+
+ for (i = 0; i < len; i++) {
+ tmp = a[i] ^ b[i];
+ tmp &= mask;
+ a[i] ^= tmp;
+ b[i] ^= tmp;
+ }
+}
+
+
+static void s390_x25519_mod_p(unsigned char u[32])
+{
+ unsigned char u_red[32];
+ unsigned int c = 0;
+ int i;
+
+ memcpy(u_red, u, sizeof(u_red));
+
+ c += (unsigned int)u_red[31] + 19;
+ u_red[31] = (unsigned char)c;
+ c >>= 8;
+
+ for (i = 30; i >= 0; i--) {
+ c += (unsigned int)u_red[i];
+ u_red[i] = (unsigned char)c;
+ c >>= 8;
+ }
+
+ c = (u_red[0] & 0x80) >> 7;
+ u_red[0] &= 0x7f;
+ constant_time_cond_swap_buff(0 - (unsigned char)c,
+ u, u_red, sizeof(u_red));
+}
+
+static void s390_x448_mod_p(unsigned char u[56])
+{
+ unsigned char u_red[56];
+ unsigned int c = 0;
+ int i;
+
+ memcpy(u_red, u, sizeof(u_red));
+
+ c += (unsigned int)u_red[55] + 1;
+ u_red[55] = (unsigned char)c;
+ c >>= 8;
+
+ for (i = 54; i >= 28; i--) {
+ c += (unsigned int)u_red[i];
+ u_red[i] = (unsigned char)c;
+ c >>= 8;
+ }
+
+ c += (unsigned int)u_red[27] + 1;
+ u_red[27] = (unsigned char)c;
+ c >>= 8;
+
+ for (i = 26; i >= 0; i--) {
+ c += (unsigned int)u_red[i];
+ u_red[i] = (unsigned char)c;
+ c >>= 8;
+ }
+
+ constant_time_cond_swap_buff(0 - (unsigned char)c,
+ u, u_red, sizeof(u_red));
+}
+
int scalar_mulx_cpacf(unsigned char *res_u,
const unsigned char *scalar,
const unsigned char *u,
@@ -598,6 +683,9 @@ struct { \
s390_flip_endian_32(param.X25519.u, param.X25519.u);
s390_flip_endian_32(param.X25519.scalar, param.X25519.scalar);
+ /* reduce non-canonical values */
+ s390_x25519_mod_p(param.X25519.u);
+
fc = s390_pcc_functions[SCALAR_MULTIPLY_X25519].hw_fc;
rc = s390_pcc(fc, &param) ? EIO : 0;
@@ -619,6 +707,9 @@ struct { \
s390_flip_endian_64(param.X448.u, param.X448.u);
s390_flip_endian_64(param.X448.scalar, param.X448.scalar);
+ /* reduce non-canonical values */
+ s390_x448_mod_p(param.X448.u + 8);
+
fc = s390_pcc_functions[SCALAR_MULTIPLY_X448].hw_fc;
rc = s390_pcc(fc, &param) ? EIO : 0;
--
2.13.7

6
libica.changes
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@ -1,3 +1,9 @@
-------------------------------------------------------------------
Thu Nov 14 22:45:16 UTC 2019 - Mark Post <mpost@suse.com>
- Added libica-sles15sp2-x25519-x448-fix-handling-of-non-canonical-values.patch
(bsc#1156768)
-------------------------------------------------------------------
Tue Oct 15 18:53:36 UTC 2019 - Mark Post <mpost@suse.com>

1
libica.spec
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@ -37,6 +37,7 @@ Source4: z90crypt
Source5: z90crypt.service
Source6: baselibs.conf
Source7: %{name}-rpmlintrc
Patch1: libica-sles15sp2-x25519-x448-fix-handling-of-non-canonical-values.patch
BuildRequires: autoconf
BuildRequires: automake
BuildRequires: gcc-c++