Using the PKI tree with SRKs as intermediate CA isn't necessary or even desirable in some situations (boot time, for example). Add the possbility to use the "fast authentication" method where the image and CSF are both signed using the SRK [1, p.63].
[1] https://community.nxp.com/pwmxy87654/attachments/pwmxy87654/imx-processors/2...
Signed-off-by: Brian Ruley brian.ruley@gehealthcare.com Cc: Marek Vasut marex@denx.de
tools/binman/etype/nxp_imx8mcst.py | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-) --- tools/binman/etype/nxp_imx8mcst.py | 44 ++++++++++++++++++++++-------- 1 file changed, 32 insertions(+), 12 deletions(-)
diff --git a/tools/binman/etype/nxp_imx8mcst.py b/tools/binman/etype/nxp_imx8mcst.py index 0c744a00d7..a80cb94499 100644 --- a/tools/binman/etype/nxp_imx8mcst.py +++ b/tools/binman/etype/nxp_imx8mcst.py @@ -36,6 +36,9 @@ csf_config_template = ''' File = "SRK_1_2_3_4_table.bin" Source index = 0
+[Install NOCAK] + File = "SRK1_sha256_4096_65537_v3_usr_crt.pem" + [Install CSFK] File = "CSF1_1_sha256_4096_65537_v3_usr_crt.pem"
@@ -74,16 +77,25 @@ class Entry_nxp_imx8mcst(Entry_mkimage): self._node, 'nxp,srk-table', 'SRK_1_2_3_4_table.bin' )) - self.csf_crt = os.getenv( - 'CSF_KEY', fdt_util.GetString( - self._node, 'nxp,csf-crt', - 'CSF1_1_sha256_4096_65537_v3_usr_crt.pem' - )) - self.img_crt = os.getenv( - 'IMG_KEY', fdt_util.GetString( - self._node, 'nxp,img-crt', - 'IMG1_1_sha256_4096_65537_v3_usr_crt.pem' - )) + self.fast_auth = fdt_util.GetBool(self._node, 'nxp,fast-auth') + if not self.fast_auth: + self.csf_crt = os.getenv( + 'CSF_KEY', fdt_util.GetString( + self._node, 'nxp,csf-crt', + 'CSF1_1_sha256_4096_65537_v3_usr_crt.pem' + )) + self.img_crt = os.getenv( + 'IMG_KEY', fdt_util.GetString( + self._node, 'nxp,img-crt', + 'IMG1_1_sha256_4096_65537_v3_usr_crt.pem' + )) + else: + self.srk_crt = os.getenv( + 'SRK_KEY', fdt_util.GetString( + self._node, 'nxp,srk-crt', + 'SRK1_sha256_4096_65537_v3_usr_crt.pem' + )) + self.unlock = fdt_util.GetBool(self._node, 'nxp,unlock') self.ReadEntries()
@@ -137,8 +149,16 @@ class Entry_nxp_imx8mcst(Entry_mkimage): # Load configuration template and modify keys of interest config.read_string(csf_config_template) config['Install SRK']['File'] = '"' + self.srk_table + '"' - config['Install CSFK']['File'] = '"' + self.csf_crt + '"' - config['Install Key']['File'] = '"' + self.img_crt + '"' + if not self.fast_auth: + config.remove_section('Install NOCAK') + config['Install CSFK']['File'] = '"' + self.csf_crt + '"' + config['Install Key']['File'] = '"' + self.img_crt + '"' + else: + config.remove_section('Install CSFK') + config.remove_section('Install Key') + config['Install NOCAK']['File'] = '"' + self.srk_crt + '"' + config['Authenticate Data']['Verification index'] = '0' + config['Authenticate Data']['Blocks'] = (hex(signbase) + ' 0 ' + hex(len(data)) + ' "' + str(output_dname) + '"')