3 files changed, 148 insertions, 0 deletions
diff --git a/include/osmocom/crypt/Makefile.am b/include/osmocom/crypt/Makefile.am
new file mode 100644
index 00000000..e4a6e538
--- /dev/null
+++ b/include/osmocom/crypt/Makefile.am
@@ -0,0 +1,3 @@
+osmocrypt_HEADERS = gprs_cipher.h auth.h
+
+osmocryptdir = $(includedir)/osmocom/crypt
diff --git a/include/osmocom/crypt/auth.h b/include/osmocom/crypt/auth.h
new file mode 100644
index 00000000..67b32009
--- /dev/null
+++ b/include/osmocom/crypt/auth.h
@@ -0,0 +1,91 @@
+#ifndef _OSMOCRYPTO_AUTH_H
+#define _OSMOCRYPTO_AUTH_H
+
+#include <stdint.h>
+
+#include <osmocom/core/linuxlist.h>
+
+/*! \brief Authentication Type */
+enum osmo_sub_auth_type {
+	OSMO_AUTH_TYPE_NONE	= 0x00,
+	OSMO_AUTH_TYPE_GSM	= 0x01,
+	OSMO_AUTH_TYPE_UMTS	= 0x02,
+};
+
+/*! \brief Authentication Algorithm */
+enum osmo_auth_algo {
+	OSMO_AUTH_ALG_NONE,
+	OSMO_AUTH_ALG_COMP128v1,
+	OSMO_AUTH_ALG_COMP128v2,
+	OSMO_AUTH_ALG_COMP128v3,
+	OSMO_AUTH_ALG_XOR,
+	OSMO_AUTH_ALG_MILENAGE,
+	_OSMO_AUTH_ALG_NUM,
+};
+
+/*! \brief permanent (secret) subscriber auth data */
+struct osmo_sub_auth_data {
+	enum osmo_sub_auth_type type;
+	enum osmo_auth_algo algo;
+	union {
+		struct {
+			uint8_t opc[16];
+			uint8_t k[16];
+			uint8_t amf[2];
+			uint64_t sqn;
+			int opc_is_op;
+		} umts;
+		struct {
+			uint8_t ki[16];
+		} gsm;
+	} u;
+};
+
+/* data structure describing a computed auth vector, generated by AuC */
+struct osmo_auth_vector {
+	uint8_t rand[16];
+	uint8_t autn[16];
+	uint8_t ck[16];
+	uint8_t ik[16];
+	uint8_t res[16];
+	uint8_t res_len;
+	uint8_t kc[8];
+	uint8_t sres[4];
+	uint32_t auth_types;	/*!< bitmask of OSMO_AUTH_TYPE_* */
+};
+
+/* \brief An implementation of an authentication algorithm */
+struct osmo_auth_impl {
+	struct llist_head list;
+	enum osmo_auth_algo algo;
+	const char *name;
+	unsigned int priority;
+
+	int (*gen_vec)(struct osmo_auth_vector *vec,
+			struct osmo_sub_auth_data *aud,
+			const uint8_t *_rand);
+
+	int (*gen_vec_auts)(struct osmo_auth_vector *vec,
+			    struct osmo_sub_auth_data *aud,
+			    const uint8_t *rand_auts, const uint8_t *auts,
+			    const uint8_t *_rand);
+};
+
+int osmo_auth_gen_vec(struct osmo_auth_vector *vec,
+		      struct osmo_sub_auth_data *aud, const uint8_t *_rand);
+
+int osmo_auth_gen_vec_auts(struct osmo_auth_vector *vec,
+			   struct osmo_sub_auth_data *aud,
+			   const uint8_t *rand_auts, const uint8_t *auts,
+			   const uint8_t *_rand);
+
+int osmo_auth_register(struct osmo_auth_impl *impl);
+
+int osmo_auth_load(const char *path);
+
+int osmo_auth_supported(enum osmo_auth_algo algo);
+
+const char *osmo_auth_alg_name(enum osmo_auth_algo alg);
+enum osmo_auth_algo osmo_auth_alg_parse(const char *name);
+
+#endif /* _OSMOCRYPTO_AUTH_H */
diff --git a/include/osmocom/crypt/gprs_cipher.h b/include/osmocom/crypt/gprs_cipher.h
new file mode 100644
index 00000000..30510711
--- /dev/null
+++ b/include/osmocom/crypt/gprs_cipher.h
@@ -0,0 +1,54 @@
+#ifndef _GPRS_CIPHER_H
+#define _GPRS_CIPHER_H
+
+#include <osmocom/core/linuxlist.h>
+
+#define GSM0464_CIPH_MAX_BLOCK	1523
+
+enum gprs_ciph_algo {
+	GPRS_ALGO_GEA0,
+	GPRS_ALGO_GEA1,
+	GPRS_ALGO_GEA2,
+	GPRS_ALGO_GEA3,
+	_GPRS_ALGO_NUM
+};
+
+enum gprs_cipher_direction {
+	GPRS_CIPH_MS2SGSN,
+	GPRS_CIPH_SGSN2MS,
+};
+
+/* An implementation of a GPRS cipher */
+struct gprs_cipher_impl {
+	struct llist_head list;
+	enum gprs_ciph_algo algo;
+	const char *name;
+	unsigned int priority;
+
+	/* As specified in 04.64 Annex A.  Uses Kc, IV and direction
+	 * to generate the 1523 bytes cipher stream that need to be
+	 * XORed wit the plaintext for encrypt / ciphertext for decrypt */
+	int (*run)(uint8_t *out, uint16_t len, uint64_t kc, uint32_t iv,
+		   enum gprs_cipher_direction direction);
+};
+
+/* register a cipher with the core (from a plugin) */
+int gprs_cipher_register(struct gprs_cipher_impl *ciph);
+
+/* load all available GPRS cipher plugins */
+int gprs_cipher_load(const char *path);
+
+/* function to be called by core code */
+int gprs_cipher_run(uint8_t *out, uint16_t len, enum gprs_ciph_algo algo,
+		    uint64_t kc, uint32_t iv, enum gprs_cipher_direction dir);
+
+/* Do we have an implementation for this cipher? */
+int gprs_cipher_supported(enum gprs_ciph_algo algo);
+
+/* GSM TS 04.64 / Section A.2.1 : Generation of 'input' */
+uint32_t gprs_cipher_gen_input_ui(uint32_t iov_ui, uint8_t sapi, uint32_t lfn, uint32_t oc);
+
+/* GSM TS 04.64 / Section A.2.1 : Generation of 'input' */
+uint32_t gprs_cipher_gen_input_i(uint32_t iov_i, uint32_t lfn, uint32_t oc);
+
+#endif /* _GPRS_CIPHER_H */