Hi Lukas,
> This patch adds support to generate hash using AES-CMAC algorithm
> ---
> src/shared/crypto.c | 37 +++++++++++++++++++++++++++++++++++++
> src/shared/crypto.h | 4 ++++
> 2 files changed, 41 insertions(+)
>
> diff --git a/src/shared/crypto.c b/src/shared/crypto.c
> index f0b2979..a0bcc7b 100644
> --- a/src/shared/crypto.c
> +++ b/src/shared/crypto.c
> @@ -256,6 +256,43 @@ static inline void swap128(const uint8_t src[16], uint8_t dst[16])
> dst[15 - i] = src[i];
> }
>
> +bool bt_crypto_cmac_aes_hash(struct bt_crypto *crypto,
> + const uint8_t key[16],
> + const uint8_t *m, uint16_t m_len,
> + uint8_t hash[12])
> +{
> + int fd;
> + int len;
> + uint8_t tmp[16], out[16];
> +
> + if (!crypto)
> + return false;
> +
> + /* The most significant octet of key corresponds to key[0] */
> + swap128(key, tmp);
> +
> + fd = alg_new(crypto->cmac_aes, tmp, 16);
> + if (fd < 0)
> + return false;
> +
> + len = send(fd, m, m_len, 0);
> + if (len < 0)
> + return false;
> +
> + len = read(fd, out, 16);
> + if (len < 0)
> + return false;
> +
> + /*
> + * The most significant octet of hash corresponds to out[0] - swap it.
> + * Then truncate in most significant bit first order to a length of
> + * 12 octets
> + */
> + swap128(out, tmp);
> + memcpy(hash, tmp + 4, 12);
> +
> + return true;
> +}
> /*
> * Security function e
> *
> diff --git a/src/shared/crypto.h b/src/shared/crypto.h
> index cae8daa..05888b9 100644
> --- a/src/shared/crypto.h
> +++ b/src/shared/crypto.h
> @@ -46,3 +46,7 @@ bool bt_crypto_c1(struct bt_crypto *crypto, const uint8_t k[16],
> bool bt_crypto_s1(struct bt_crypto *crypto, const uint8_t k[16],
> const uint8_t r1[16], const uint8_t r2[16],
> uint8_t res[16]);
> +bool bt_crypto_cmac_aes_hash(struct bt_crypto *crypto,
> + const uint8_t key[16],
> + const uint8_t *m, uint16_t m_len,
> + uint8_t hash[12]);
we are using the cryptographic names from the Bluetooth specification cryptographic toolbox. I bet this one has a proper function name as well. So lets use that one.
Regards
Marcel
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