Remove RSA PKCS#1 v1.5 support from cert_tool
Support for PKCS#1 v1.5 was deprecated in SHA 1001202 and fully removed
in SHA fe199e3, however, cert_tool is still able to generate
certificates in that form. This patch fully removes the ability for
cert_tool to generate these certificates.
Additionally, this patch also fixes a bug where the issuing certificate
was a RSA and the issued certificate was EcDSA. In this case, the issued
certificate would be signed using PKCS#1 v1.5 instead of RSAPSS per
PKCS#1 v2.1, preventing TF-A from verifying the image signatures. Now
that PKCS#1 v1.5 support is removed, all certificates that are signed
with RSA now use the more modern padding scheme.
Change-Id: Id87d7d915be594a1876a73080528d968e65c4e9a
Signed-off-by: Justin Chadwell <justin.chadwell@arm.com>
diff --git a/docs/getting_started/user-guide.rst b/docs/getting_started/user-guide.rst
index 8915738..1229e66 100644
--- a/docs/getting_started/user-guide.rst
+++ b/docs/getting_started/user-guide.rst
@@ -588,10 +588,8 @@
- ``KEY_ALG``: This build flag enables the user to select the algorithm to be
used for generating the PKCS keys and subsequent signing of the certificate.
- It accepts 3 values: ``rsa``, ``rsa_1_5`` and ``ecdsa``. The option
- ``rsa_1_5`` is the legacy PKCS#1 RSA 1.5 algorithm which is not TBBR
- compliant and is retained only for compatibility. The default value of this
- flag is ``rsa`` which is the TBBR compliant PKCS#1 RSA 2.1 scheme.
+ It accepts 2 values: ``rsa`` and ``ecdsa``. The default value of this flag
+ is ``rsa`` which is the TBBR compliant PKCS#1 RSA 2.1 scheme.
- ``KEY_SIZE``: This build flag enables the user to select the key size for
the algorithm specified by ``KEY_ALG``. The valid values for ``KEY_SIZE``
diff --git a/drivers/auth/mbedtls/mbedtls_common.mk b/drivers/auth/mbedtls/mbedtls_common.mk
index f34d3d0..4b83015 100644
--- a/drivers/auth/mbedtls/mbedtls_common.mk
+++ b/drivers/auth/mbedtls/mbedtls_common.mk
@@ -48,9 +48,9 @@
)
# The platform may define the variable 'TF_MBEDTLS_KEY_ALG' to select the key
-# algorithm to use. If the variable is not defined, select it based on algorithm
-# used for key generation `KEY_ALG`. If `KEY_ALG` is not defined or is
-# defined to `rsa`/`rsa_1_5`, then set the variable to `rsa`.
+# algorithm to use. If the variable is not defined, select it based on
+# algorithm used for key generation `KEY_ALG`. If `KEY_ALG` is not defined,
+# then it is set to `rsa`.
ifeq (${TF_MBEDTLS_KEY_ALG},)
ifeq (${KEY_ALG}, ecdsa)
TF_MBEDTLS_KEY_ALG := ecdsa
diff --git a/tools/cert_create/include/cert.h b/tools/cert_create/include/cert.h
index 39b45b5..6db9b57 100644
--- a/tools/cert_create/include/cert.h
+++ b/tools/cert_create/include/cert.h
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -49,7 +49,6 @@
cert_t *cert_get_by_opt(const char *opt);
int cert_add_ext(X509 *issuer, X509 *subject, int nid, char *value);
int cert_new(
- int key_alg,
int md_alg,
cert_t *cert,
int days,
diff --git a/tools/cert_create/include/key.h b/tools/cert_create/include/key.h
index c08beb8..d96d983 100644
--- a/tools/cert_create/include/key.h
+++ b/tools/cert_create/include/key.h
@@ -21,7 +21,6 @@
/* Supported key algorithms */
enum {
KEY_ALG_RSA, /* RSA PSS as defined by PKCS#1 v2.1 (default) */
- KEY_ALG_RSA_1_5, /* RSA as defined by PKCS#1 v1.5 */
#ifndef OPENSSL_NO_EC
KEY_ALG_ECDSA,
#endif /* OPENSSL_NO_EC */
@@ -42,7 +41,6 @@
/* NOTE: the first item in each array is the default key size */
static const unsigned int KEY_SIZES[KEY_ALG_MAX_NUM][KEY_SIZE_MAX_NUM] = {
{ 2048, 1024, 3072, 4096 }, /* KEY_ALG_RSA */
- { 2048, 1024, 3072, 4096 }, /* KEY_ALG_RSA_1_5 */
#ifndef OPENSSL_NO_EC
{} /* KEY_ALG_ECDSA */
#endif /* OPENSSL_NO_EC */
diff --git a/tools/cert_create/src/cert.c b/tools/cert_create/src/cert.c
index 8e8aee6..c68a265 100644
--- a/tools/cert_create/src/cert.c
+++ b/tools/cert_create/src/cert.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -93,7 +93,6 @@
}
int cert_new(
- int key_alg,
int md_alg,
cert_t *cert,
int days,
@@ -143,10 +142,10 @@
}
/*
- * Set additional parameters if algorithm is RSA PSS. This is not
- * required for RSA 1.5 or ECDSA.
+ * Set additional parameters if issuing public key algorithm is RSA.
+ * This is not required for ECDSA.
*/
- if (key_alg == KEY_ALG_RSA) {
+ if (EVP_PKEY_base_id(ikey) == EVP_PKEY_RSA) {
if (!EVP_PKEY_CTX_set_rsa_padding(pKeyCtx, RSA_PKCS1_PSS_PADDING)) {
ERR_print_errors_fp(stdout);
goto END;
diff --git a/tools/cert_create/src/key.c b/tools/cert_create/src/key.c
index 93d31f7..0f80cce 100644
--- a/tools/cert_create/src/key.c
+++ b/tools/cert_create/src/key.c
@@ -112,7 +112,6 @@
typedef int (*key_create_fn_t)(key_t *key, int key_bits);
static const key_create_fn_t key_create_fn[KEY_ALG_MAX_NUM] = {
key_create_rsa, /* KEY_ALG_RSA */
- key_create_rsa, /* KEY_ALG_RSA_1_5 */
#ifndef OPENSSL_NO_EC
key_create_ecdsa, /* KEY_ALG_ECDSA */
#endif /* OPENSSL_NO_EC */
diff --git a/tools/cert_create/src/main.c b/tools/cert_create/src/main.c
index 44a65eb..0cbd219 100644
--- a/tools/cert_create/src/main.c
+++ b/tools/cert_create/src/main.c
@@ -92,7 +92,6 @@
static const char *key_algs_str[] = {
[KEY_ALG_RSA] = "rsa",
- [KEY_ALG_RSA_1_5] = "rsa_1_5",
#ifndef OPENSSL_NO_EC
[KEY_ALG_ECDSA] = "ecdsa"
#endif /* OPENSSL_NO_EC */
@@ -277,8 +276,7 @@
},
{
{ "key-alg", required_argument, NULL, 'a' },
- "Key algorithm: 'rsa' (default) - RSAPSS scheme as per \
-PKCS#1 v2.1, 'rsa_1_5' - RSA PKCS#1 v1.5, 'ecdsa'"
+ "Key algorithm: 'rsa' (default)- RSAPSS scheme as per PKCS#1 v2.1, 'ecdsa'"
},
{
{ "key-size", required_argument, NULL, 'b' },
@@ -545,7 +543,7 @@
}
/* Create certificate. Signed with corresponding key */
- if (cert->fn && !cert_new(key_alg, hash_alg, cert, VAL_DAYS, 0, sk)) {
+ if (cert->fn && !cert_new(hash_alg, cert, VAL_DAYS, 0, sk)) {
ERROR("Cannot create %s\n", cert->cn);
exit(1);
}
