diff --git a/programs/ssl/ssl_client2.c b/programs/ssl/ssl_client2.c
index 879a127..27284fc 100644
--- a/programs/ssl/ssl_client2.c
+++ b/programs/ssl/ssl_client2.c
@@ -83,6 +83,7 @@
 #define DFL_MIN_VERSION         -1
 #define DFL_MAX_VERSION         -1
 #define DFL_ARC4                -1
+#define DFL_SHA1                -1
 #define DFL_AUTH_MODE           -1
 #define DFL_MFL_CODE            MBEDTLS_SSL_MAX_FRAG_LEN_NONE
 #define DFL_TRUNC_HMAC          -1
@@ -251,6 +252,7 @@
     USAGE_DHMLEN                                            \
     "\n"                                                    \
     "    arc4=%%d             default: (library default: 0)\n" \
+    "    allow_sha1=%%d       default: 0\n"                             \
     "    min_version=%%s      default: (library default: tls1)\n"       \
     "    max_version=%%s      default: (library default: tls1_2)\n"     \
     "    force_version=%%s    default: \"\" (none)\n"       \
@@ -288,6 +290,7 @@
     int min_version;            /* minimum protocol version accepted        */
     int max_version;            /* maximum protocol version accepted        */
     int arc4;                   /* flag for arc4 suites support             */
+    int allow_sha1;             /* flag for SHA-1 support                   */
     int auth_mode;              /* verify mode for connection               */
     unsigned char mfl_code;     /* code for maximum fragment length         */
     int trunc_hmac;             /* negotiate truncated hmac or not          */
@@ -496,6 +499,7 @@
     opt.min_version         = DFL_MIN_VERSION;
     opt.max_version         = DFL_MAX_VERSION;
     opt.arc4                = DFL_ARC4;
+    opt.allow_sha1          = DFL_SHA1;
     opt.auth_mode           = DFL_AUTH_MODE;
     opt.mfl_code            = DFL_MFL_CODE;
     opt.trunc_hmac          = DFL_TRUNC_HMAC;
@@ -708,6 +712,15 @@
                 default:    goto usage;
             }
         }
+        else if( strcmp( p, "allow_sha1" ) == 0 )
+        {
+            switch( atoi( q ) )
+            {
+                case 0:     opt.allow_sha1 = 0;   break;
+                case 1:     opt.allow_sha1 = 1;    break;
+                default:    goto usage;
+            }
+        }
         else if( strcmp( p, "force_version" ) == 0 )
         {
             if( strcmp( q, "ssl3" ) == 0 )
@@ -1094,9 +1107,12 @@
 #if defined(MBEDTLS_X509_CRT_PARSE_C)
     /* The default algorithms profile disables SHA-1, but our tests still
        rely on it heavily. */
-    crt_profile_for_test.allowed_mds |= MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA1 );
-    mbedtls_ssl_conf_cert_profile( &conf, &crt_profile_for_test );
-    mbedtls_ssl_conf_sig_hashes( &conf, ssl_sig_hashes_for_test );
+    if( opt.allow_sha1 > 0 )
+    {
+        crt_profile_for_test.allowed_mds |= MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA1 );
+        mbedtls_ssl_conf_cert_profile( &conf, &crt_profile_for_test );
+        mbedtls_ssl_conf_sig_hashes( &conf, ssl_sig_hashes_for_test );
+    }
 
     if( opt.debug_level > 0 )
         mbedtls_ssl_conf_verify( &conf, my_verify, NULL );
diff --git a/programs/ssl/ssl_server2.c b/programs/ssl/ssl_server2.c
index c1ba4d8..204e4fd 100644
--- a/programs/ssl/ssl_server2.c
+++ b/programs/ssl/ssl_server2.c
@@ -119,6 +119,7 @@
 #define DFL_MIN_VERSION         -1
 #define DFL_MAX_VERSION         -1
 #define DFL_ARC4                -1
+#define DFL_SHA1                -1
 #define DFL_AUTH_MODE           -1
 #define DFL_MFL_CODE            MBEDTLS_SSL_MAX_FRAG_LEN_NONE
 #define DFL_TRUNC_HMAC          -1
@@ -333,6 +334,7 @@
     USAGE_ETM                                               \
     "\n"                                                    \
     "    arc4=%%d             default: (library default: 0)\n" \
+    "    allow_sha1=%%d       default: 0\n"                             \
     "    min_version=%%s      default: (library default: tls1)\n"       \
     "    max_version=%%s      default: (library default: tls1_2)\n"     \
     "    force_version=%%s    default: \"\" (none)\n"       \
@@ -387,6 +389,7 @@
     int min_version;            /* minimum protocol version accepted        */
     int max_version;            /* maximum protocol version accepted        */
     int arc4;                   /* flag for arc4 suites support             */
+    int allow_sha1;             /* flag for SHA-1 support                   */
     int auth_mode;              /* verify mode for connection               */
     unsigned char mfl_code;     /* code for maximum fragment length         */
     int trunc_hmac;             /* accept truncated hmac?                   */
@@ -932,6 +935,7 @@
     opt.min_version         = DFL_MIN_VERSION;
     opt.max_version         = DFL_MAX_VERSION;
     opt.arc4                = DFL_ARC4;
+    opt.allow_sha1          = DFL_SHA1;
     opt.auth_mode           = DFL_AUTH_MODE;
     opt.mfl_code            = DFL_MFL_CODE;
     opt.trunc_hmac          = DFL_TRUNC_HMAC;
@@ -1100,6 +1104,15 @@
                 default:    goto usage;
             }
         }
+        else if( strcmp( p, "allow_sha1" ) == 0 )
+        {
+            switch( atoi( q ) )
+            {
+                case 0:     opt.allow_sha1 = 0;   break;
+                case 1:     opt.allow_sha1 = 1;    break;
+                default:    goto usage;
+            }
+        }
         else if( strcmp( p, "force_version" ) == 0 )
         {
             if( strcmp( q, "ssl3" ) == 0 )
@@ -1622,8 +1635,11 @@
     /* The default algorithms profile disables SHA-1, but our tests still
        rely on it heavily. Hence we allow it here. A real-world server
        should use the default profile unless there is a good reason not to. */
-    crt_profile_for_test.allowed_mds |= MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA1 );
-    mbedtls_ssl_conf_cert_profile( &conf, &crt_profile_for_test );
+    if( opt.allow_sha1 > 0 )
+    {
+        crt_profile_for_test.allowed_mds |= MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA1 );
+        mbedtls_ssl_conf_cert_profile( &conf, &crt_profile_for_test );
+    }
 #endif /* MBEDTLS_X509_CRT_PARSE_C */
 
     if( opt.auth_mode != DFL_AUTH_MODE )
diff --git a/tests/data_files/.gitignore b/tests/data_files/.gitignore
index 7611e9b..d16c04c 100644
--- a/tests/data_files/.gitignore
+++ b/tests/data_files/.gitignore
@@ -1,2 +1,3 @@
 cli-rsa.csr
+server2-rsa.csr
 test-ca.csr
diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index e419ce9..9604b05 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -31,6 +31,14 @@
 	$(OPENSSL) x509 -req -extfile $(cli_crt_extensions_file) -extensions cli-rsa -CA test-ca-sha256.crt -CAkey $(test_ca_key_file_rsa) -passin "pass:$(test_ca_pwd_rsa)" -set_serial 4 -days 3653 -sha256 -in cli-rsa.csr -out $@
 all_final += cli-rsa-sha256.crt
 
+server2-rsa.csr: server2.key
+	$(OPENSSL) req -new -key server2.key -passin "pass:$(test_ca_pwd_rsa)" -subj "/C=NL/O=PolarSSL/CN=localhost" -out $@
+all_intermediate += server2-rsa.csr
+server2-sha256.crt: server2-rsa.csr
+	$(OPENSSL) x509 -req -extfile $(cli_crt_extensions_file) -extensions cli-rsa -CA test-ca-sha256.crt -CAkey $(test_ca_key_file_rsa) -passin "pass:$(test_ca_pwd_rsa)" -set_serial 4 -days 3653 -sha256 -in server2-rsa.csr -out $@
+all_final += server2-sha256.crt
+
+
 all_final: $(all_final)
 all: $(all_intermediate) $(all_final)
 
diff --git a/tests/data_files/server2-sha256.crt b/tests/data_files/server2-sha256.crt
new file mode 100644
index 0000000..006d9db
--- /dev/null
+++ b/tests/data_files/server2-sha256.crt
@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----
+MIIDfTCCAmWgAwIBAgIBBDANBgkqhkiG9w0BAQsFADA7MQswCQYDVQQGEwJOTDER
+MA8GA1UECgwIUG9sYXJTU0wxGTAXBgNVBAMMEFBvbGFyU1NMIFRlc3QgQ0EwHhcN
+MTcwNTA5MTM1MTA1WhcNMjcwNTEwMTM1MTA1WjA0MQswCQYDVQQGEwJOTDERMA8G
+A1UECgwIUG9sYXJTU0wxEjAQBgNVBAMMCWxvY2FsaG9zdDCCASIwDQYJKoZIhvcN
+AQEBBQADggEPADCCAQoCggEBAMFNo93nzR3RBNdJcriZrA545Do8Ss86ExbQWuTN
+owCIp+4ea5anUrSQ7y1yej4kmvy2NKwk9XfgJmSMnLAofaHa6ozmyRyWvP7BBFKz
+NtSj+uGxdtiQwWG0ZlI2oiZTqqt0Xgd9GYLbKtgfoNkNHC1JZvdbJXNG6AuKT2kM
+tQCQ4dqCEGZ9rlQri2V5kaHiYcPNQEkI7mgM8YuG0ka/0LiqEQMef1aoGh5EGA8P
+hYvai0Re4hjGYi/HZo36Xdh98yeJKQHFkA4/J/EwyEoO79bex8cna8cFPXrEAjya
+HT4P6DSYW8tzS1KW2BGiLICIaTla0w+w3lkvEcf36hIBMJcCAwEAAaOBkjCBjzAd
+BgNVHQ4EFgQUpQXoZLjc32APUBJNYKhkr02LQ5MwYwYDVR0jBFwwWoAUtFrkpbPe
+0lL2udWmlQ/rPrzH/f+hP6Q9MDsxCzAJBgNVBAYTAk5MMREwDwYDVQQKDAhQb2xh
+clNTTDEZMBcGA1UEAwwQUG9sYXJTU0wgVGVzdCBDQYIBADAJBgNVHRMEAjAAMA0G
+CSqGSIb3DQEBCwUAA4IBAQAQf85QSjAeP+l6hirPorUL+k/3BznAh/6RXdveBO3K
+uwtqK5qI59+3N+ZLXP7fr2Z5eO8qpchRgNNwT0LKglAEXGWn30PYI1GKSiqAaK0X
+CUNIrxV3qKqOLbtqP1dMdiwsmiHYrN8E9UdysObedE2yDNLpTMHPJBZ+k6FowTyZ
+IpUuabkxMBFxmLv+nOBDOiaCzintEcdJdY4F6p5j8jwMvVNVAXNfxAEwa0MoVRTt
+/GORvq4ZEfsatVA+HRi602m+dZETTWKSODrj8AuQcG8/i1AOhk3C1WNOFKj/ZSfB
+2P6EQmhLeRp4bO+3rG73T3R2yn0PZYQ7ZrjFPPKqgu+n
+-----END CERTIFICATE-----
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 24b0fff..ca0a1f1 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -632,6 +632,40 @@
             -S "SSL - None of the common ciphersuites is usable" \
             -S "SSL - The server has no ciphersuites in common"
 
+# Tests for SHA-1 support
+
+run_test    "SHA-1 forbidden by default in server certificate" \
+            "$P_SRV key_file=data_files/server2.key crt_file=data_files/server2.crt" \
+            "$P_CLI debug_level=2 allow_sha1=0" \
+            1 \
+            -c "The certificate is signed with an unacceptable hash"
+
+run_test    "SHA-1 explicitly allowed in server certificate" \
+            "$P_SRV key_file=data_files/server2.key crt_file=data_files/server2.crt" \
+            "$P_CLI allow_sha1=1" \
+            0
+
+run_test    "SHA-256 allowed by default in server certificate" \
+            "$P_SRV key_file=data_files/server2.key crt_file=data_files/server2-sha256.crt" \
+            "$P_CLI allow_sha1=0" \
+            0
+
+run_test    "SHA-1 forbidden by default in client certificate" \
+            "$P_SRV auth_mode=required allow_sha1=0" \
+            "$P_CLI key_file=data_files/cli-rsa.key crt_file=data_files/cli-rsa-sha1.crt" \
+            1 \
+            -s "The certificate is signed with an unacceptable hash"
+
+run_test    "SHA-1 explicitly allowed in client certificate" \
+            "$P_SRV auth_mode=required allow_sha1=1" \
+            "$P_CLI key_file=data_files/cli-rsa.key crt_file=data_files/cli-rsa-sha1.crt" \
+            0
+
+run_test    "SHA-256 allowed by default in client certificate" \
+            "$P_SRV auth_mode=required allow_sha1=0" \
+            "$P_CLI key_file=data_files/cli-rsa.key crt_file=data_files/cli-rsa-sha256.crt" \
+            0
+
 # Tests for Truncated HMAC extension
 
 run_test    "Truncated HMAC: client default, server default" \