/*
 * Copyright 2021 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef PLATFORMS_HAVEN_LIBCR51SIGN_LIBCR51SIGN_SUPPORT_H_
#define PLATFORMS_HAVEN_LIBCR51SIGN_LIBCR51SIGN_SUPPORT_H_

#include "libcr51sign.h"

#include <openssl/sha.h>

#ifdef __cplusplus
extern "C"
{
#endif

    struct hash_ctx
    {
        enum hash_type hash_type;
        union
        {
            SHA256_CTX sha256_ctx;
            SHA512_CTX sha512_ctx;
        };
    };

    // @func hash_init get ready to compute a hash
    //
    // @param[in] ctx - context struct
    // @param[in] hash_type - type of hash function to use
    //
    // @return nonzero on error, zero on success

    int hash_init(const void* ctx, enum hash_type type);

    // @func hash_update add data to the hash
    //
    // @param[in] ctx - context struct
    // @param[in] buf - data to add to hash
    // @param[in] count - number of bytes of data to add
    //
    // @return nonzero on error, zero on success

    int hash_update(void* ctx, const uint8_t* data, size_t size);

    // @func hash_final finish hash calculation
    //
    // @param[in] ctx - context struct
    // @param[out] hash - buffer to write hash to (guaranteed to be big enough)
    //
    // @return nonzero on error, zero on success

    int hash_final(void* ctx, uint8_t* hash);

    // @func verify check that the signature is valid for given hashed data
    //
    // @param[in] ctx - context struct
    // @param[in] scheme - type of signature, hash, etc.
    // @param[in] sig - signature blob
    // @param[in] sig_len - length of signature in bytes
    // @param[in] data - pre-hashed data to verify
    // @param[in] data_len - length of hashed data in bytes
    //
    // @return nonzero on error, zero on success

    int verify_signature(const void* ctx, enum signature_scheme sig_scheme,
                         const uint8_t* sig, size_t sig_len,
                         const uint8_t* data, size_t data_len);

#ifdef __cplusplus
} //  extern "C"
#endif
#endif // PLATFORMS_HAVEN_LIBCR51SIGN_LIBCR51SIGN_SUPPORT_H_