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Fix Modulus Exponentiation in SE driver

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This commit is contained in:
Michael Scire 2018-03-01 02:00:39 -08:00
parent 4025781f1c
commit b67ce08f84
1 changed files with 4 additions and 4 deletions
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8
exosphere/src/se.c
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@ -154,12 +154,12 @@ void set_rsa_keyslot(unsigned int keyslot, const void *modulus, size_t modulus_
for (size_t i = 0; i < (modulus_size >> 2); i++) {
SECURITY_ENGINE->RSA_KEYTABLE_ADDR = (keyslot << 7) | 0x40 | i;
SECURITY_ENGINE->RSA_KEYTABLE_DATA = read32be(modulus, 4 * i);
SECURITY_ENGINE->RSA_KEYTABLE_DATA = read32be(modulus, (4 * (modulus_size >> 2)) - (4 * i) - 4);
}
for (size_t i = 0; i < (exp_size >> 2); i++) {
SECURITY_ENGINE->RSA_KEYTABLE_ADDR = (keyslot << 7) | i;
SECURITY_ENGINE->RSA_KEYTABLE_DATA = read32be(exponent, 4 * i);
SECURITY_ENGINE->RSA_KEYTABLE_DATA = read32be(exponent, (4 * (exp_size >> 2)) - (4 * i) - 4);
}
g_se_modulus_sizes[keyslot] = modulus_size;
@ -307,8 +307,8 @@ void se_synchronous_exp_mod(unsigned int keyslot, void *dst, size_t dst_size, co
}
/* Endian swap the input. */
for (size_t i = src_size; i > 0; i--) {
stack_buf[i] = *((uint8_t *)src + src_size - i);
for (size_t i = 0; i < src_size; i++) {
stack_buf[i] = *((uint8_t *)src + src_size - i - 1);
}
SECURITY_ENGINE->CONFIG_REG = (ALG_RSA | DST_RSAREG);