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keys: Use accurate logic for eticket keypair read

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This commit is contained in:
shchmue 2022-02-09 10:54:01 -07:00
parent 54ed439cce
commit 64a6491309
5 changed files with 47 additions and 9 deletions
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21
bdk/utils/util.c
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@ -102,6 +102,27 @@ void exec_cfg(u32 *base, const cfg_op_t *ops, u32 num_ops)
base[ops[i].off] = ops[i].val;
}
u16 crc16_calc(const u8 *buf, u32 len)
{
const u8 *p, *q;
u16 crc = 0x55aa;
static u16 table[16] = {
0x0000, 0xCC01, 0xD801, 0x1400, 0xF001, 0x3C00, 0x2800, 0xE401,
0xA001, 0x6C00, 0x7800, 0xB401, 0x5000, 0x9C01, 0x8801, 0x4400
};
q = buf + len;
for (p = buf; p < q; p++)
{
u8 oct = *p;
crc = (crc >> 4) ^ table[crc & 0xf] ^ table[(oct >> 0) & 0xf];
crc = (crc >> 4) ^ table[crc & 0xf] ^ table[(oct >> 4) & 0xf];
}
return crc;
}
u32 crc32_calc(u32 crc, const u8 *buf, u32 len)
{
const u8 *p, *q;

1
bdk/utils/util.h
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@ -83,6 +83,7 @@ u8 bit_count(u32 val);
u32 bit_count_mask(u8 bits);
void exec_cfg(u32 *base, const cfg_op_t *ops, u32 num_ops);
u16 crc16_calc(const u8 *buf, u32 len);
u32 crc32_calc(u32 crc, const u8 *buf, u32 len);
u32 get_tmr_us();