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aes ctr128 is verified

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This commit is contained in:
Sukchan Lee 2017-03-08 12:10:39 +09:00
parent 17890be353
commit ae2b415c6d
3 changed files with 92 additions and 3 deletions
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4
lib/core/include/core_aes.h
View file

@ -34,6 +34,10 @@ CORE_DECLARE(status_t) aes_cbc_decrypt(const c_uint8_t *key,
const c_uint8_t *in, const c_uint32_t inlen,
c_uint8_t *out, c_uint32_t *outlen);
CORE_DECLARE(status_t) aes_ctr128_encrypt(const c_uint8_t *key,
c_uint8_t *ivec, const c_uint8_t *in, const c_uint32_t len,
c_uint8_t *out);
#ifdef __cplusplus
}
#endif /* __cplusplus */

47
lib/core/src/aes.c
View file

@ -1342,3 +1342,50 @@ status_t aes_cbc_decrypt(const c_uint8_t *key, const c_uint32_t keybits,
return CORE_OK;
}
static void ctr128_inc(c_uint8_t *counter)
{
c_uint32_t n = 16, c = 1;
do {
--n;
c += counter[n];
counter[n] = (c_uint8_t)c;
c >>= 8;
} while (n);
}
status_t aes_ctr128_encrypt(const c_uint8_t *key,
c_uint8_t *ivec, const c_uint8_t *in, const c_uint32_t len,
c_uint8_t *out)
{
c_uint8_t ecount_buf[16];
c_uint32_t rk[RKLENGTH(MAX_KEY_BITS)];
int nrounds;
unsigned int n = 0;
size_t l = 0;
d_assert(key, return CORE_ERROR, "Null param");
d_assert(ivec, return CORE_ERROR, "Null param");
d_assert(in, return CORE_ERROR, "Null param");
d_assert(len, return CORE_ERROR, "param 'inlen' is zero");
d_assert(out, return CORE_ERROR, "Null param");
memset(ecount_buf, 0, 16);
nrounds = aes_setup_enc(rk, key, 128);
while (l < len)
{
if (n == 0)
{
aes_encrypt(rk, nrounds, ivec, ecount_buf);
ctr128_inc(ivec);
}
out[l] = in[l] ^ ecount_buf[n];
++l;
n = (n + 1) % 16;
}
return CORE_OK;
}