src/lib/hmac.h

	hmac.h revision d8361cc8576d9ede93a037f9b96f2a3f9b7e9054
#ifndef HMAC_H
#define HMAC_H

#include "hash-method.h"
#include "sha1.h"

#define HMAC_MAX_CONTEXT_SIZE 256

struct hmac_context_priv {
    char ctx[HMAC_MAX_CONTEXT_SIZE];
    char ctxo[HMAC_MAX_CONTEXT_SIZE];
    const struct hash_method *hash;
};

struct hmac_context {
    union {
        struct hmac_context_priv priv;
        uint64_t padding_requirement;
    } u;
};

void hmac_init(struct hmac_context *ctx, const unsigned char *key,
        size_t key_len, const struct hash_method *meth);
void hmac_final(struct hmac_context *ctx, unsigned char *digest);


static inline void
hmac_update(struct hmac_context *_ctx, const void *data, size_t size)
{
    struct hmac_context_priv *ctx = &_ctx->u.priv;

    ctx->hash->loop(ctx->ctx, data, size);
}

#endif