This patch adds support to generate hash using AES-CMAC algorithm
---
src/shared/crypto.c | 36 ++++++++++++++++++++++++++++++++++++
src/shared/crypto.h | 3 +++
2 files changed, 39 insertions(+)
diff --git a/src/shared/crypto.c b/src/shared/crypto.c
index f0b2979..0aec373 100644
--- a/src/shared/crypto.c
+++ b/src/shared/crypto.c
@@ -256,6 +256,42 @@ static inline void swap128(const uint8_t src[16], uint8_t dst[16])
dst[15 - i] = src[i];
}
+bool bt_crypto_sign_att(struct bt_crypto *crypto, const uint8_t key[16],
+ const uint8_t *m, uint16_t m_len,
+ uint8_t signature[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(signature, tmp + 4, 12);
+
+ return true;
+}
/*
* Security function e
*
diff --git a/src/shared/crypto.h b/src/shared/crypto.h
index cae8daa..64faed2 100644
--- a/src/shared/crypto.h
+++ b/src/shared/crypto.h
@@ -46,3 +46,6 @@ 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_sign_att(struct bt_crypto *crypto, const uint8_t key[16],
+ const uint8_t *m, uint16_t m_len,
+ uint8_t signature[12]);
--
1.8.4
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