-----Original Message----- From: Marek Vasut [mailto:marex@denx.de] Sent: Friday, December 28, 2018 6:05 PM To: Ooi, Joyce joyce.ooi@intel.com; Michal Simek michal.simek@xilinx.com; Siva Durga Prasad Paladugu siva.durga.paladugu@xilinx.com Cc: u-boot@lists.denx.de; See, Chin Liang chin.liang.see@intel.com; Chee, Tien Fong tien.fong.chee@intel.com; Tan, Ley Foon ley.foon.tan@intel.com Subject: Re: [PATCH] rsa: read out public_exponent value based on 32-bit alignment
On 12/28/18 8:30 AM, Ooi, Joyce wrote:
Hi Marek,
Hi,
Any comments about this?
Use get_unaligned() ?
It seems that if USE_HOSTCC is enabled, get_unaligned_* can't be used.
In lib/rsa/rsa-mod-exp.c, #ifndef USE_HOSTCC .. #include <asm/unaligned.h> #else #include "fdt_host.h" #include "mkimage.h" #include <fdt_support.h> #endif
So, to make it more generic (with or without USE_HOSTCC enabled), I read out the public_exponent as two 32-bit datas and then concatenating them into a 64-bit data.
Thanks, Joyce Ooi
-----Original Message----- From: Ooi, Joyce Sent: Saturday, December 8, 2018 4:18 PM To: Marek Vasut marex@denx.de; Michal Simek michal.simek@xilinx.com; Siva Durga Prasad Paladugu siva.durga.paladugu@xilinx.com Cc: u-boot@lists.denx.de; Ooi, Joyce joyce.ooi@intel.com; See, Chin Liang chin.liang.see@intel.com; Chee, Tien Fong tien.fong.chee@intel.com; Tan, Ley Foon ley.foon.tan@intel.com Subject: [PATCH] rsa: read out public_exponent value based on 32-bit alignment
Public_exponent is a 64-bit data, which is stored in the device tree blob in a 32- bit alignment address. This causes a problem for ARM64 when public_exponent is read out one shot as a 64-bit data from an unaligned address. Hence, to solve this problem, public_exponent is read out as two 32-bit datas, and then concatenating them.
Signed-off-by: Ooi, Joyce joyce.ooi@intel.com
lib/rsa/rsa-mod-exp.c | 6 ++++-- 1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/lib/rsa/rsa-mod-exp.c b/lib/rsa/rsa-mod-exp.c index 9d78aa1..3eace38 100644 --- a/lib/rsa/rsa-mod-exp.c +++ b/lib/rsa/rsa-mod-exp.c @@ -252,6 +252,9 @@ int rsa_mod_exp_sw(const uint8_t *sig, uint32_t sig_len, { struct rsa_public_key key; int ret;
uint64_t exponent =
(uint64_t)(*((uint32_t *)(prop->public_exponent + 4))) << 32 |*((uint32_t *)(prop->public_exponent));if (!prop) { debug("%s: Skipping invalid prop", __func__); @@ -263,8
+266,7 @@ int rsa_mod_exp_sw(const uint8_t *sig, uint32_t sig_len, if (!prop->public_exponent) key.exponent = RSA_DEFAULT_PUBEXP; else
key.exponent =fdt64_to_cpu(*((uint64_t *)(prop->public_exponent)));
key.exponent = fdt64_to_cpu(exponent);if (!key.len || !prop->modulus || !prop->rr) { debug("%s: Missing RSA key info", __func__);
-- 1.7.1
-- Best regards, Marek Vasut