package/ibrcommon: fix static build with openssl

gf_mul is already defined in libcrypto (openssl) so rename it into
ibrdtn_gf_mul to fix the following build failure in ibrdtnd package:

/home/buildroot/autobuild/instance-3/output/host/bin/../arm-buildroot-uclinux-uclibcgnueabi/sysroot/usr/lib/libcrypto.a(f_impl.o): In function `gf_mul':
f_impl.c:(.text+0x0): multiple definition of `gf_mul'
/home/buildroot/autobuild/instance-3/output/host/arm-buildroot-uclinux-uclibcgnueabi/sysroot/usr/lib/libibrcommon.a(gf128mul.o):gf128mul.cpp:(.text+0x30): first defined here
collect2: error: ld returned 1 exit status
Makefile:560: recipe for target 'dtnd' failed

Fixes:
 - http://autobuild.buildroot.org/results/1d3b4b6cf043a3e185ce758b617a0a18c3d36cdb

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/ibrcommon/0003-ibrcommon-ssl-gcm-fix-static-build-with-openssl.patch

@@ -0,0 +1,94 @@
+From 8118c43a53271ba2dd31ce3913a3cd21bc7dcca7 Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Sat, 16 Feb 2019 11:58:34 +0100
+Subject: [PATCH] ibrcommon/ssl/gcm: fix static build with openssl
+
+gf_mul is already defined in libcrypto (openssl) so rename it into
+ibrdtn_gf_mul to fix following build failure:
+
+/home/buildroot/autobuild/instance-3/output/host/bin/../arm-buildroot-uclinux-uclibcgnueabi/sysroot/usr/lib/libcrypto.a(f_impl.o): In function `gf_mul':
+f_impl.c:(.text+0x0): multiple definition of `gf_mul'
+/home/buildroot/autobuild/instance-3/output/host/arm-buildroot-uclinux-uclibcgnueabi/sysroot/usr/lib/libibrcommon.a(gf128mul.o):gf128mul.cpp:(.text+0x30): first defined here
+collect2: error: ld returned 1 exit status
+Makefile:560: recipe for target 'dtnd' failed
+
+Fixes:
+ - http://autobuild.buildroot.org/results/1d3b4b6cf043a3e185ce758b617a0a18c3d36cdb
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Upstream status: https://github.com/ibrdtn/ibrdtn/pull/269]
+---
+ ibrcommon/ibrcommon/ssl/gcm/gcm.cpp      | 10 +++++-----
+ ibrcommon/ibrcommon/ssl/gcm/gf128mul.cpp |  2 +-
+ ibrcommon/ibrcommon/ssl/gcm/gf128mul.h   |  2 +-
+ 3 files changed, 7 insertions(+), 7 deletions(-)
+
+diff --git a/ibrcommon/ssl/gcm/gcm.cpp b/ibrcommon/ssl/gcm/gcm.cpp
+index 8a5745b4..6097b43e 100644
+--- a/ibrcommon/ssl/gcm/gcm.cpp
++++ b/ibrcommon/ssl/gcm/gcm.cpp
+@@ -89,7 +89,7 @@ ret_type gcm_init_and_key(                      /* initialise mode and set key
+ #elif defined( TABLES_256 )
+ #define gf_mul_hh(a, ctx, scr)  gf_mul_256(a, ctx->gf_t256, scr)
+ #else
+-#define gf_mul_hh(a, ctx, scr)  gf_mul(a, ui8_ptr(ctx->ghash_h))
++#define gf_mul_hh(a, ctx, scr)  ibrdtn_gf_mul(a, ui8_ptr(ctx->ghash_h))
+ #endif
+ 
+ ret_type gcm_init_message(                      /* initialise a new message     */
+@@ -334,9 +334,9 @@ ret_type gcm_compute_tag(                       /* compute authentication tag
+         memcpy(tbuf, ctx->ghash_h, BLOCK_SIZE);
+         for( ; ; )
+         {
+-            if(ln & 1) gf_mul(ui8_ptr(ctx->hdr_ghv), tbuf);
++            if(ln & 1) ibrdtn_gf_mul(ui8_ptr(ctx->hdr_ghv), tbuf);
+             if(!(ln >>= 1)) break;
+-            gf_mul(tbuf, tbuf);
++            ibrdtn_gf_mul(tbuf, tbuf);
+         }
+     }
+ #else   /* this one seems slower on x86 and x86_64 :-( */
+@@ -348,12 +348,12 @@ ret_type gcm_compute_tag(                       /* compute authentication tag
+         tbuf[0] = 0x80;
+         while(i)
+         {
+-            gf_mul(tbuf, tbuf);
++            ibrdtn_gf_mul(tbuf, tbuf);
+             if(i & ln)
+                 gf_mul_hh(tbuf, ctx, scratch);
+             i >>= 1;
+         }
+-        gf_mul(ui8_ptr(ctx->hdr_ghv), tbuf);
++        ibrdtn_gf_mul(ui8_ptr(ctx->hdr_ghv), tbuf);
+     }
+ #endif
+     i = BLOCK_SIZE; ln = (uint_32t)(ctx->txt_acnt << 3);
+diff --git a/ibrcommon/ssl/gcm/gf128mul.cpp b/ibrcommon/ssl/gcm/gf128mul.cpp
+index a553a044..d0c460c3 100644
+--- a/ibrcommon/ssl/gcm/gf128mul.cpp
++++ b/ibrcommon/ssl/gcm/gf128mul.cpp
+@@ -103,7 +103,7 @@
+ 
+ const unsigned short gf_tab[256] = gf_dat(xda);
+ 
+-void gf_mul(void *a, const void* b)
++void ibrdtn_gf_mul(void *a, const void* b)
+ {   uint_32t r[GF_BYTE_LEN >> 2], p[8][GF_BYTE_LEN >> 2];
+     int i;
+ 
+diff --git a/ibrcommon/ssl/gcm/gf128mul.h b/ibrcommon/ssl/gcm/gf128mul.h
+index 4645c7fe..65fba54b 100644
+--- a/ibrcommon/ssl/gcm/gf128mul.h
++++ b/ibrcommon/ssl/gcm/gf128mul.h
+@@ -619,7 +619,7 @@ gf_inline void mul_x(void *r, const void *x)
+ 
+ /*  A slow generic version of gf_mul (a = a * b) */
+ 
+-void gf_mul(void *a, const void* b);
++void ibrdtn_gf_mul(void *a, const void* b);
+ 
+ /*  This version uses 64k bytes of table space on the stack.
+     A 16 byte buffer has to be multiplied by a 16 byte key
+-- 
+2.14.1
+