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__);