[PATCH] libsodium: Add patch to enable 1.0.21 to build on aarch64

[Adolf Belka <adolf.belka@ipfire.org>]

- The update to 1.0.21 resulted in libsodium not building on aarch64. A fix has b
   been developed and will ultimately be available with the next release. This uses that
   patch fix to be applied to 1.0.21
- Build tested on aarch64 and was successfull.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
---
 lfs/libsodium                                 |  1 +
 ..._fix_compilation_with_GCC_on_aarch64.patch | 33 +++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 src/patches/libsodium-1.0.21_fix_compilation_with_GCC_on_aarch64.patch

diff --git a/lfs/libsodium b/lfs/libsodium
index acd4a72dc..8f6605643 100644
--- a/lfs/libsodium
+++ b/lfs/libsodium
@@ -73,6 +73,7 @@ $(subst %,%_BLAKE2,$(objects)) :
 $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
 	@$(PREBUILD)
 	@rm -rf $(DIR_APP) && cd $(DIR_SRC) && tar axf $(DIR_DL)/$(DL_FILE)
+	cd $(DIR_APP) && patch -Np1 < $(DIR_SRC)/src/patches/libsodium-1.0.21_fix_compilation_with_GCC_on_aarch64.patch
 	cd $(DIR_APP) && ./configure \
 				--prefix=/usr \
 				--disable-static
diff --git a/src/patches/libsodium-1.0.21_fix_compilation_with_GCC_on_aarch64.patch b/src/patches/libsodium-1.0.21_fix_compilation_with_GCC_on_aarch64.patch
new file mode 100644
index 000000000..1ffdbd088
--- /dev/null
+++ b/src/patches/libsodium-1.0.21_fix_compilation_with_GCC_on_aarch64.patch
@@ -0,0 +1,33 @@
+diff --git a/src/libsodium/crypto_ipcrypt/ipcrypt_armcrypto.c b/src/libsodium/crypto_ipcrypt/ipcrypt_armcrypto.c
+index c5a27e92ec..bad4ce3898 100644
+--- a/src/libsodium/crypto_ipcrypt/ipcrypt_armcrypto.c
++++ b/src/libsodium/crypto_ipcrypt/ipcrypt_armcrypto.c
+@@ -37,7 +37,7 @@ typedef uint64x2_t BlockVec;
+ #    define XOR128_3(a, b, c) veorq_u64(veorq_u64((a), (b)), (c))
+ #    define SET64x2(a, b)     vsetq_lane_u64((uint64_t) (a), vmovq_n_u64((uint64_t) (b)), 1)
+ #    define BYTESHL128(a, b) \
+-        vreinterpretq_u64_u8(vextq_s8(vdupq_n_s8(0), vreinterpretq_s8_u64(a), 16 - (b)))
++        vreinterpretq_u64_u8(vextq_u8(vdupq_n_u8(0), vreinterpretq_u8_u64(a), 16 - (b)))
+ 
+ #    define AES_XENCRYPT(block_vec, rkey) \
+         vreinterpretq_u64_u8(             \
+@@ -348,12 +348,12 @@ pfx_set_bit(uint8_t ip16[16], const unsigned int bit_index, const uint8_t bit_va
+ static void
+ pfx_shift_left(uint8_t ip16[16])
+ {
+-    BlockVec       v       = LOAD128(ip16);
+-    const BlockVec shl     = vshlq_n_u8(vreinterpretq_u8_u64(v), 1);
+-    const BlockVec msb     = vshrq_n_u8(vreinterpretq_u8_u64(v), 7);
+-    const BlockVec zero    = vdupq_n_u8(0);
+-    const BlockVec carries = vextq_u8(vreinterpretq_u8_u64(msb), zero, 1);
+-    v                      = vreinterpretq_u64_u8(vorrq_u8(shl, carries));
++    BlockVec         v       = LOAD128(ip16);
++    const uint8x16_t shl     = vshlq_n_u8(vreinterpretq_u8_u64(v), 1);
++    const uint8x16_t msb     = vshrq_n_u8(vreinterpretq_u8_u64(v), 7);
++    const uint8x16_t zero    = vdupq_n_u8(0);
++    const uint8x16_t carries = vextq_u8(msb, zero, 1);
++    v                        = vreinterpretq_u64_u8(vorrq_u8(shl, carries));
+     STORE128(ip16, v);
+ }
+ 
+
-- 
2.53.0