lib/crypto: add aes_ccm_128

metze

1 files changed, 54 insertions, 0 deletions

diff --git a/lib/crypto/aes_ccm_128.h b/lib/crypto/aes_ccm_128.h
new file mode 100644
index 0000000000..a98c754433
--- /dev/null
+++ b/lib/crypto/aes_ccm_128.h
@@ -0,0 +1,54 @@
+/*
+   AES-CCM-128 (rfc 3610)
+
+   Copyright (C) Stefan Metzmacher 2012
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef LIB_CRYPTO_AES_CCM_128_H
+#define LIB_CRYPTO_AES_CCM_128_H
+
+#define AES_CCM_128_M 16
+#define AES_CCM_128_L 4
+#define AES_CCM_128_NONCE_SIZE (15 - AES_CCM_128_L)
+
+struct aes_ccm_128_context {
+	AES_KEY aes_key;
+	uint8_t nonce[AES_CCM_128_NONCE_SIZE];
+
+	size_t a_remain;
+	size_t m_remain;
+
+	uint8_t X_i[AES_BLOCK_SIZE];
+	uint8_t B_i[AES_BLOCK_SIZE];
+	size_t B_i_ofs;
+
+	uint8_t S_i[AES_BLOCK_SIZE];
+	size_t S_i_ofs;
+	size_t S_i_ctr;
+};
+
+void aes_ccm_128_init(struct aes_ccm_128_context *ctx,
+		      const uint8_t K[AES_BLOCK_SIZE],
+		      const uint8_t N[AES_CCM_128_NONCE_SIZE],
+		      size_t a_total, size_t m_total);
+void aes_ccm_128_update(struct aes_ccm_128_context *ctx,
+			const uint8_t *v, size_t v_len);
+void aes_ccm_128_crypt(struct aes_ccm_128_context *ctx,
+			 uint8_t *m, size_t m_len);
+void aes_ccm_128_digest(struct aes_ccm_128_context *ctx,
+			uint8_t digest[AES_BLOCK_SIZE]);
+
+#endif /* LIB_CRYPTO_AES_CCM_128_H */