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Annotation of embedaddon/bird/lib/mac.h, revision 1.1.1.1

1.1       misho       1: /*
                      2:  *     BIRD Library -- Message Authentication Codes
                      3:  *
                      4:  *     (c) 2016 Ondrej Zajicek <santiago@crfreenet.org>
                      5:  *     (c) 2016 CZ.NIC z.s.p.o.
                      6:  *
                      7:  *     Can be freely distributed and used under the terms of the GNU GPL.
                      8:  */
                      9: 
                     10: #ifndef _BIRD_MAC_H_
                     11: #define _BIRD_MAC_H_
                     12: 
                     13: #include "nest/bird.h"
                     14: #include "lib/sha512.h"
                     15: 
                     16: 
                     17: #define ALG_UNDEFINED          0
                     18: #define ALG_MD5                        0x01
                     19: #define ALG_SHA1               0x02
                     20: #define ALG_SHA224             0x03
                     21: #define ALG_SHA256             0x04
                     22: #define ALG_SHA384             0x05
                     23: #define ALG_SHA512             0x06
                     24: #define ALG_HMAC               0x10
                     25: #define ALG_HMAC_MD5           0x11
                     26: #define ALG_HMAC_SHA1          0x12
                     27: #define ALG_HMAC_SHA224                0x13
                     28: #define ALG_HMAC_SHA256                0x14
                     29: #define ALG_HMAC_SHA384                0x15
                     30: #define ALG_HMAC_SHA512                0x16
                     31: #define ALG_MAX                        0x17
                     32: 
                     33: /* These are maximums for HASH/MAC lengths and required context space */
                     34: #define MAX_HASH_SIZE          SHA512_SIZE
                     35: #define HASH_STORAGE           sizeof(struct sha512_context)
                     36: #define MAC_STORAGE            sizeof(struct hmac_context)
                     37: 
                     38: /* This value is used by several IETF protocols for padding */
                     39: #define HMAC_MAGIC             htonl(0x878FE1F3)
                     40: 
                     41: /* Generic context used by hash functions */
                     42: struct hash_context
                     43: {
                     44:   u8 data[HASH_STORAGE];
                     45:   u64 align[0];
                     46: };
                     47: 
                     48: /* Context for embedded hash (not-really-MAC hash) */
                     49: struct nrmh_context {
                     50:   const struct mac_desc *type;
                     51:   struct hash_context ictx;
                     52: };
                     53: 
                     54: /* Context for hash based HMAC */
                     55: struct hmac_context {
                     56:   const struct mac_desc *type;
                     57:   struct hash_context ictx;
                     58:   struct hash_context octx;
                     59: };
                     60: 
                     61: /* Generic context used by MAC functions */
                     62: struct mac_context
                     63: {
                     64:   const struct mac_desc *type;
                     65:   u8 data[MAC_STORAGE - sizeof(void *)];
                     66:   u64 align[0];
                     67: };
                     68: 
                     69: /* Union to satisfy C aliasing rules */
                     70: union mac_context_union {
                     71:   struct mac_context mac;
                     72:   struct nrmh_context nrmh;
                     73:   struct hmac_context hmac;
                     74: };
                     75: 
                     76: 
                     77: struct mac_desc {
                     78:   const char *name;                    /* Name of MAC algorithm */
                     79:   uint mac_length;                     /* Length of authentication code */
                     80:   uint ctx_length;                     /* Length of algorithm context */
                     81:   void (*init)(struct mac_context *ctx, const byte *key, uint keylen);
                     82:   void (*update)(struct mac_context *ctx, const byte *data, uint datalen);
                     83:   byte *(*final)(struct mac_context *ctx);
                     84: 
                     85:   uint hash_size;                      /* Hash length, for hash-based MACs */
                     86:   uint block_size;                     /* Hash block size, for hash-based MACs */
                     87:   void (*hash_init)(struct hash_context *ctx);
                     88:   void (*hash_update)(struct hash_context *ctx, const byte *data, uint datalen);
                     89:   byte *(*hash_final)(struct hash_context *ctx);
                     90: };
                     91: 
                     92: extern const struct mac_desc mac_table[ALG_MAX];
                     93: 
                     94: static inline const char *mac_type_name(uint id)
                     95: { return mac_table[id].name; }
                     96: 
                     97: static inline uint mac_type_length(uint id)
                     98: { return mac_table[id].mac_length; }
                     99: 
                    100: static inline const char *mac_get_name(struct mac_context *ctx)
                    101: { return ctx->type->name; }
                    102: 
                    103: static inline uint mac_get_length(struct mac_context *ctx)
                    104: { return ctx->type->mac_length; }
                    105: 
                    106: void mac_init(struct mac_context *ctx, uint id, const byte *key, uint keylen);
                    107: 
                    108: static inline void mac_update(struct mac_context *ctx, const byte *data, uint datalen)
                    109: { ctx->type->update(ctx, data, datalen); }
                    110: 
                    111: static inline byte *mac_final(struct mac_context *ctx)
                    112: { return ctx->type->final(ctx); }
                    113: 
                    114: static inline void mac_cleanup(struct mac_context *ctx)
                    115: { memset(ctx, 0, ctx->type->ctx_length); }
                    116: 
                    117: void mac_fill(uint id, const byte *key, uint keylen, const byte *data, uint datalen, byte *mac);
                    118: int mac_verify(uint id, const byte *key, uint keylen, const byte *data, uint datalen, const byte *mac);
                    119: 
                    120: 
                    121: #endif /* _BIRD_MAC_H_ */