121 lines
3.3 KiB
C
121 lines
3.3 KiB
C
/*
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* BIRD Library -- Message Authentication Codes
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*
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* (c) 2016 Ondrej Zajicek <santiago@crfreenet.org>
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* (c) 2016 CZ.NIC z.s.p.o.
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifndef _BIRD_MAC_H_
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#define _BIRD_MAC_H_
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#include "nest/bird.h"
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#include "lib/sha512.h"
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#define ALG_UNDEFINED 0
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#define ALG_MD5 0x01
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#define ALG_SHA1 0x02
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#define ALG_SHA224 0x03
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#define ALG_SHA256 0x04
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#define ALG_SHA384 0x05
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#define ALG_SHA512 0x06
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#define ALG_HMAC 0x10
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#define ALG_HMAC_MD5 0x11
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#define ALG_HMAC_SHA1 0x12
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#define ALG_HMAC_SHA224 0x13
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#define ALG_HMAC_SHA256 0x14
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#define ALG_HMAC_SHA384 0x15
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#define ALG_HMAC_SHA512 0x16
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#define ALG_MAX 0x17
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/* These are maximums for HASH/MAC lengths and required context space */
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#define MAX_HASH_SIZE SHA512_SIZE
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#define HASH_STORAGE sizeof(struct sha512_context)
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#define MAC_STORAGE sizeof(struct hmac_context)
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/* This value is used by several IETF protocols for padding */
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#define HMAC_MAGIC htonl(0x878FE1F3)
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/* Generic context used by hash functions */
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struct hash_context
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{
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u8 data[HASH_STORAGE];
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u64 align[0];
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};
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/* Context for embedded hash (not-really-MAC hash) */
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struct nrmh_context {
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const struct mac_desc *type;
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struct hash_context ictx;
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};
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/* Context for hash based HMAC */
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struct hmac_context {
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const struct mac_desc *type;
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struct hash_context ictx;
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struct hash_context octx;
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};
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/* Generic context used by MAC functions */
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struct mac_context
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{
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const struct mac_desc *type;
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u8 data[MAC_STORAGE - sizeof(void *)];
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u64 align[0];
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};
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/* Union to satisfy C aliasing rules */
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union mac_context_union {
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struct mac_context mac;
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struct nrmh_context nrmh;
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struct hmac_context hmac;
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};
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struct mac_desc {
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const char *name; /* Name of MAC algorithm */
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uint mac_length; /* Length of authentication code */
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uint ctx_length; /* Length of algorithm context */
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void (*init)(struct mac_context *ctx, const byte *key, uint keylen);
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void (*update)(struct mac_context *ctx, const byte *data, uint datalen);
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byte *(*final)(struct mac_context *ctx);
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uint hash_size; /* Hash length, for hash-based MACs */
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uint block_size; /* Hash block size, for hash-based MACs */
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void (*hash_init)(struct hash_context *ctx);
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void (*hash_update)(struct hash_context *ctx, const byte *data, uint datalen);
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byte *(*hash_final)(struct hash_context *ctx);
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};
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const struct mac_desc mac_table[ALG_MAX];
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static inline const char *mac_type_name(uint id)
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{ return mac_table[id].name; }
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static inline uint mac_type_length(uint id)
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{ return mac_table[id].mac_length; }
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static inline const char *mac_get_name(struct mac_context *ctx)
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{ return ctx->type->name; }
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static inline uint mac_get_length(struct mac_context *ctx)
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{ return ctx->type->mac_length; }
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void mac_init(struct mac_context *ctx, uint id, const byte *key, uint keylen);
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static inline void mac_update(struct mac_context *ctx, const byte *data, uint datalen)
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{ ctx->type->update(ctx, data, datalen); }
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static inline byte *mac_final(struct mac_context *ctx)
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{ return ctx->type->final(ctx); }
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static inline void mac_cleanup(struct mac_context *ctx)
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{ memset(ctx, 0, ctx->type->ctx_length); }
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void mac_fill(uint id, const byte *key, uint keylen, const byte *data, uint datalen, byte *mac);
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int mac_verify(uint id, const byte *key, uint keylen, const byte *data, uint datalen, const byte *mac);
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#endif /* _BIRD_MAC_H_ */
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