diff --git a/ChangeLog b/ChangeLog
index 0dac497..4fe9c94 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -10,8 +10,6 @@
      ARMmbed/mbed-crypto#352
 
 Bugfix
-   * Allow loading symlinked certificates. Fixes #3005. Reported and fixed
-     by Jonathan Bennett <JBennett@incomsystems.biz> via #3008.
    * Fix an unchecked call to mbedtls_md() in the x509write module.
 
 = mbed TLS 2.7.13 branch released 2020-01-15
diff --git a/library/bignum.c b/library/bignum.c
index 9692127..827a3cb 100644
--- a/library/bignum.c
+++ b/library/bignum.c
@@ -151,9 +151,10 @@
     mbedtls_mpi_uint *p;
     size_t i;
 
-    /* Actually resize up in this case */
+    /* Actually resize up if there are currently fewer than nblimbs limbs. */
     if( X->n <= nblimbs )
         return( mbedtls_mpi_grow( X, nblimbs ) );
+    /* After this point, then X->n > nblimbs and in particular X->n > 0. */
 
     for( i = X->n - 1; i > 0; i-- )
         if( X->p[i] != 0 )
@@ -190,7 +191,7 @@
     if( X == Y )
         return( 0 );
 
-    if( Y->p == NULL )
+    if( Y->n == 0 )
     {
         mbedtls_mpi_free( X );
         return( 0 );
diff --git a/library/certs.c b/library/certs.c
index 4ae3c24..7cc71ae 100644
--- a/library/certs.c
+++ b/library/certs.c
@@ -180,6 +180,10 @@
 
 #if defined(MBEDTLS_SHA256_C)
 /* tests/data_files/server2-sha256.crt */
+/* Or more precisely, this is the contents of the version of this file
+ * that's in the mbedtls-2.16 branch, due to a backporting mistake.
+ * We don't want to change the contents now, as that would change the size
+ * which is part of the ABI, which should be stable in LTS branches. */
 #define TEST_SRV_CRT_RSA_SHA256                                          \
 "-----BEGIN CERTIFICATE-----\r\n"                                        \
 "MIIDNzCCAh+gAwIBAgIBAjANBgkqhkiG9w0BAQsFADA7MQswCQYDVQQGEwJOTDER\r\n"   \
diff --git a/library/x509_crt.c b/library/x509_crt.c
index 55c7ea1..3ad53a7 100644
--- a/library/x509_crt.c
+++ b/library/x509_crt.c
@@ -1207,7 +1207,7 @@
             goto cleanup;
         }
 
-        if( !( S_ISREG( sb.st_mode ) || S_ISLNK( sb.st_mode ) ) )
+        if( !S_ISREG( sb.st_mode ) )
             continue;
 
         // Ignore parse errors
diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index 658aa22..3f7a769 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -94,6 +94,11 @@
 	cat $(test_ca_crt_file_ec) $(test_ca_crt) > $@
 all_final += $(test_ca_crt_cat21)
 
+test_ca_crt_cat12u = test-ca_cat12u.crt
+$(test_ca_crt_cat12u): $(test_ca_crt) $(test_ca_crt_file_ec)
+	cat $(test_ca_crt) $(test_ca_crt_file_ec) test-ca_utf8.crt > $@
+all_final += $(test_ca_crt_cat12u)
+
 test-int-ca.csr: test-int-ca.key $(test_ca_config_file)
 	$(OPENSSL) req -new -config $(test_ca_config_file) -key test-int-ca.key -subj "/C=NL/O=PolarSSL/CN=PolarSSL Test Intermediate CA" -out $@
 all_intermediate += test-int-ca.csr
diff --git a/tests/data_files/test-ca_cat12u.crt b/tests/data_files/test-ca_cat12u.crt
new file mode 100644
index 0000000..4ebd5e9
--- /dev/null
+++ b/tests/data_files/test-ca_cat12u.crt
@@ -0,0 +1,56 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 9e24d5b..26ea124 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -37,7 +37,7 @@
 O_SRV="$OPENSSL_CMD s_server -www -cert data_files/server5.crt -key data_files/server5.key"
 O_CLI="echo 'GET / HTTP/1.0' | $OPENSSL_CMD s_client"
 G_SRV="$GNUTLS_SERV --x509certfile data_files/server5.crt --x509keyfile data_files/server5.key"
-G_CLI="echo 'GET / HTTP/1.0' | $GNUTLS_CLI --x509cafile data_files/test-ca_cat12.crt"
+G_CLI="echo 'GET / HTTP/1.0' | $GNUTLS_CLI --x509cafile data_files/test-ca_cat12u.crt"
 TCP_CLIENT="$PERL scripts/tcp_client.pl"
 
 TESTS=0
@@ -3772,15 +3772,8 @@
 # Test for ClientHello without extensions
 
 requires_gnutls
-run_test    "ClientHello without extensions, SHA-1 allowed" \
-            "$P_SRV debug_level=3 key_file=data_files/server2.key crt_file=data_files/server2.crt" \
-            "$G_CLI --priority=NORMAL:%NO_EXTENSIONS:%DISABLE_SAFE_RENEGOTIATION" \
-            0 \
-            -s "dumping 'client hello extensions' (0 bytes)"
-
-requires_gnutls
-run_test    "ClientHello without extensions, SHA-1 forbidden in certificates on server" \
-            "$P_SRV debug_level=3 key_file=data_files/server2.key crt_file=data_files/server2.crt allow_sha1=0" \
+run_test    "ClientHello without extensions" \
+            "$P_SRV debug_level=3" \
             "$G_CLI --priority=NORMAL:%NO_EXTENSIONS:%DISABLE_SAFE_RENEGOTIATION" \
             0 \
             -s "dumping 'client hello extensions' (0 bytes)"
diff --git a/tests/suites/test_suite_mpi.data b/tests/suites/test_suite_mpi.data
index 9f53e22..a6a6423 100644
--- a/tests/suites/test_suite_mpi.data
+++ b/tests/suites/test_suite_mpi.data
@@ -274,37 +274,106 @@
 Base test mbedtls_mpi_cmp_abs (Mix values) #3
 mbedtls_mpi_cmp_abs:10:"-2":10:"1":1
 
-Base test mbedtls_mpi_copy #1
-mbedtls_mpi_copy:0:1500
+Copy zero (1 limb) to positive (1 limb)
+mbedtls_mpi_copy_sint:0:1500
 
-Base test mpi_copy_self #1
+Copy zero (1 limb) to negative (1 limb)
+mbedtls_mpi_copy_sint:0:-1500
+
+Copy positive (1 limb) to zero (1 limb)
+mbedtls_mpi_copy_sint:1500:0
+
+Copy negative (1 limb) to zero (1 limb)
+mbedtls_mpi_copy_sint:-1500:0
+
+Copy positive (1 limb) to negative (1 limb)
+mbedtls_mpi_copy_sint:1500:-42
+
+Copy negative (1 limb) to positive (1 limb)
+mbedtls_mpi_copy_sint:-42:1500
+
+Copy zero (null) to zero (null)
+mbedtls_mpi_copy_binary:"":""
+
+Copy zero (null) to positive (1 limb)
+mbedtls_mpi_copy_binary:"":"1234"
+
+Copy positive (1 limb) to zero (null)
+mbedtls_mpi_copy_binary:"1234":""
+
+Copy positive to larger
+mbedtls_mpi_copy_binary:"bead":"ca5cadedb01dfaceacc01ade"
+
+Copy positive to smaller
+mbedtls_mpi_copy_binary:"ca5cadedb01dfaceacc01ade":"bead"
+
+Copy self: positive (1 limb)
 mpi_copy_self:14
 
-Base test mbedtls_mpi_swap #1
-mbedtls_mpi_swap:0:1500
+Copy self: zero (1 limb)
+mpi_copy_self:0
 
-Test mbedtls_mpi_shrink #1
+Swap zero (1 limb) with positive (1 limb)
+mbedtls_mpi_swap_sint:0:1500
+
+Swap zero (1 limb) with negative (1 limb)
+mbedtls_mpi_swap_sint:0:-1500
+
+Swap positive (1 limb) with zero (1 limb)
+mbedtls_mpi_swap_sint:1500:0
+
+Swap negative (1 limb) with zero (1 limb)
+mbedtls_mpi_swap_sint:-1500:0
+
+Swap positive (1 limb) with negative (1 limb)
+mbedtls_mpi_swap_sint:1500:-42
+
+Swap negative (1 limb) with positive (1 limb)
+mbedtls_mpi_swap_sint:-42:1500
+
+Swap zero (null) with zero (null)
+mbedtls_mpi_swap_binary:"":""
+
+Swap zero (null) with positive (1 limb)
+mbedtls_mpi_swap_binary:"":"1234"
+
+Swap positive (1 limb) with zero (null)
+mbedtls_mpi_swap_binary:"1234":""
+
+Swap positive with larger
+mbedtls_mpi_swap_binary:"bead":"ca5cadedb01dfaceacc01ade"
+
+Swap positive with smaller
+mbedtls_mpi_swap_binary:"ca5cadedb01dfaceacc01ade":"bead"
+
+Swap self: 1 limb
+mpi_swap_self:"face"
+
+Swap self: null
+mpi_swap_self:""
+
+Shrink 2 limbs in a buffer of size 2 to 4
 mbedtls_mpi_shrink:2:2:4:4
 
-Test mbedtls_mpi_shrink #2
+Shrink 2 limbs in a buffer of size 4 to 4
 mbedtls_mpi_shrink:4:2:4:4
 
-Test mbedtls_mpi_shrink #3
+Shrink 2 limbs in a buffer of size 8 to 4
 mbedtls_mpi_shrink:8:2:4:4
 
-Test mbedtls_mpi_shrink #4
+Shrink 4 limbs in a buffer of size 8 to 4
 mbedtls_mpi_shrink:8:4:4:4
 
-Test mbedtls_mpi_shrink #5
+Shrink 6 limbs in a buffer of size 8 to 4 yielding 6
 mbedtls_mpi_shrink:8:6:4:6
 
-Test mbedtls_mpi_shrink #6
+Shrink 2 limbs in a buffer of size 4 to 0 yielding 2
 mbedtls_mpi_shrink:4:2:0:2
 
-Test mbedtls_mpi_shrink #7
+Shrink 1 limbs in a buffer of size 4 to 0 yielding 1
 mbedtls_mpi_shrink:4:1:0:1
 
-Test mbedtls_mpi_shrink #8
+Shrink 0 limbs in a buffer of size 4 to 0 yielding 1
 mbedtls_mpi_shrink:4:0:0:1
 
 Test mbedtls_mpi_safe_cond_assign #1
diff --git a/tests/suites/test_suite_mpi.function b/tests/suites/test_suite_mpi.function
index f63f2e6..6f5abf3 100644
--- a/tests/suites/test_suite_mpi.function
+++ b/tests/suites/test_suite_mpi.function
@@ -374,22 +374,40 @@
 /* END_CASE */
 
 /* BEGIN_CASE */
-void mbedtls_mpi_copy( int input_X, int input_A )
+void mbedtls_mpi_copy_sint( int input_X, int input_Y )
 {
-    mbedtls_mpi X, Y, A;
-    mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y ); mbedtls_mpi_init( &A );
+    mbedtls_mpi X, Y;
+    mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y );
 
     TEST_ASSERT( mbedtls_mpi_lset( &X, input_X ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_lset( &Y, input_A ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_lset( &A, input_A ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &Y ) != 0 );
-    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &Y, &A ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_lset( &Y, input_Y ) == 0 );
+
     TEST_ASSERT( mbedtls_mpi_copy( &Y, &X ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &Y ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &Y, &A ) != 0 );
+    TEST_ASSERT( mbedtls_mpi_cmp_int( &X, input_X ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_cmp_int( &Y, input_X ) == 0 );
 
 exit:
-    mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y ); mbedtls_mpi_free( &A );
+    mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y );
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
+void mbedtls_mpi_copy_binary( char *input_X, char *input_Y )
+{
+    mbedtls_mpi X, Y, X0;
+    mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y ); mbedtls_mpi_init( &X0 );
+
+    TEST_ASSERT( mbedtls_mpi_read_string( &X, 16, input_X ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_read_string( &Y, 16, input_Y ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_read_string( &X0, 16, input_X ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &X0 ) == 0 );
+
+    TEST_ASSERT( mbedtls_mpi_copy( &Y, &X ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &X0 ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &Y, &X0 ) == 0 );
+
+exit:
+    mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y ); mbedtls_mpi_free( &X0 );
 }
 /* END_CASE */
 
@@ -481,22 +499,61 @@
 /* END_CASE */
 
 /* BEGIN_CASE */
-void mbedtls_mpi_swap( int input_X,  int input_Y )
+void mbedtls_mpi_swap_sint( int input_X, int input_Y )
 {
-    mbedtls_mpi X, Y, A;
-    mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y ); mbedtls_mpi_init( &A );
+    mbedtls_mpi X, Y;
+    mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y );
 
     TEST_ASSERT( mbedtls_mpi_lset( &X, input_X ) == 0 );
     TEST_ASSERT( mbedtls_mpi_lset( &Y, input_Y ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_lset( &A, input_X ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &Y ) != 0 );
-    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &A ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_cmp_int( &X, input_X ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_cmp_int( &Y, input_Y ) == 0 );
+
     mbedtls_mpi_swap( &X, &Y );
-    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &Y ) != 0 );
-    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &Y, &A ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_cmp_int( &X, input_Y ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_cmp_int( &Y, input_X ) == 0 );
 
 exit:
-    mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y ); mbedtls_mpi_free( &A );
+    mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y );
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
+void mbedtls_mpi_swap_binary( char *input_X, char *input_Y )
+{
+    mbedtls_mpi X, Y, X0, Y0;
+    mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y );
+    mbedtls_mpi_init( &X0 ); mbedtls_mpi_init( &Y0 );
+
+    TEST_ASSERT( mbedtls_mpi_read_string( &X, 16, input_X ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_read_string( &Y, 16, input_Y ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_read_string( &X0, 16, input_X ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_read_string( &Y0, 16, input_Y ) == 0 );
+
+    mbedtls_mpi_swap( &X, &Y );
+    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &Y0 ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &Y, &X0 ) == 0 );
+
+exit:
+    mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y );
+    mbedtls_mpi_free( &X0 ); mbedtls_mpi_free( &Y0 );
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
+void mpi_swap_self( char *input_X )
+{
+    mbedtls_mpi X, X0;
+    mbedtls_mpi_init( &X ); mbedtls_mpi_init( &X0 );
+
+    TEST_ASSERT( mbedtls_mpi_read_string( &X, 16, input_X ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_read_string( &X0, 16, input_X ) == 0 );
+
+    mbedtls_mpi_swap( &X, &X );
+    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &X0 ) == 0 );
+
+exit:
+    mbedtls_mpi_free( &X ); mbedtls_mpi_free( &X0 );
 }
 /* END_CASE */