hmac-sha256.c File Reference

#include <esp8266.h>
#include <string.h>
#include "crypto/crypto.h"
#include "crypto/hmac-sha256.h"

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Functions
ICACHE_FLASH_ATTR void	hmac_sha256_init (hmac_sha256_ctx_t *hctx, uint8_t *key, uint32_t keylen)
ICACHE_FLASH_ATTR void	hmac_sha256_update (hmac_sha256_ctx_t *hctx, uint8_t *msg, uint32_t msglen)
ICACHE_FLASH_ATTR void	hmac_sha256_final (hmac_sha256_ctx_t *hctx, uint8_t *hmac)
ICACHE_FLASH_ATTR void	hmac_sha256 (uint8_t *key, uint32_t keylen, uint8_t *msg, uint32_t msglen, uint8_t *hmac)

Function Documentation

hmac_sha256()

ICACHE_FLASH_ATTR void hmac_sha256	(	uint8_t *	key,
		uint32_t	keylen,
		uint8_t *	msg,
		uint32_t	msglen,
		uint8_t *	hmac
	)

Definition at line 66 of file hmac-sha256.c.

References hmac_sha256_final(), hmac_sha256_init(), and hmac_sha256_update().

                                                                                              {
    hmac_sha256_ctx_t hctx;
    hmac_sha256_init(&hctx, key, keylen);
    hmac_sha256_update(&hctx, msg, msglen);
    hmac_sha256_final(&hctx, hmac);
}

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hmac_sha256_final()

ICACHE_FLASH_ATTR void hmac_sha256_final	(	hmac_sha256_ctx_t *	hctx,
		uint8_t *	hmac
	)

Definition at line 54 of file hmac-sha256.c.

References hmac_sha256_ctx_t::ctx, ICACHE_FLASH_ATTR, memset, hmac_sha256_ctx_t::o_key_pad, SHA256_BLOCK_LENGTH, SHA256_DIGEST_LENGTH, sha256_final(), sha256_init(), and sha256_update().

Referenced by decrypt_aes_hmac_combined(), encrypt_aes_hmac_combined(), and hmac_sha256().

                                                               {
    uint8_t hash[SHA256_DIGEST_LENGTH];
    sha256_final(&(hctx->ctx), hash);
    sha256_init(&(hctx->ctx));
    sha256_update(&(hctx->ctx), hctx->o_key_pad, SHA256_BLOCK_LENGTH);
    sha256_update(&(hctx->ctx), hash, SHA256_DIGEST_LENGTH);
    sha256_final(&(hctx->ctx), hmac);
    memset(hash, 0, sizeof(hash));
    memset(hctx, 0, sizeof(hmac_sha256_ctx_t));
}

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hmac_sha256_init()

ICACHE_FLASH_ATTR void hmac_sha256_init	(	hmac_sha256_ctx_t *	hctx,
		uint8_t *	key,
		uint32_t	keylen
	)

Copyright (c) 2013-2014 Tomas Dzetkulic Copyright (c) 2013-2014 Pavol Rusnak

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Definition at line 30 of file hmac-sha256.c.

References hmac_sha256_ctx_t::ctx, ICACHE_FLASH_ATTR, memcpy, memset, hmac_sha256_ctx_t::o_key_pad, SHA256_BLOCK_LENGTH, sha256_init(), sha256_raw(), and sha256_update().

Referenced by decrypt_aes_hmac_combined(), encrypt_aes_hmac_combined(), and hmac_sha256().

                                                                              {
    int i;
    uint8_t i_key_pad[SHA256_BLOCK_LENGTH];
    memset(i_key_pad, 0, SHA256_BLOCK_LENGTH);
    if (keylen > SHA256_BLOCK_LENGTH) {
        sha256_raw(key, keylen, i_key_pad);
    } else {
        memcpy(i_key_pad, key, keylen);
    }
    for (i = 0; i < SHA256_BLOCK_LENGTH; i++) {
        hctx->o_key_pad[i] = i_key_pad[i] ^ 0x5c;
        i_key_pad[i] ^= 0x36;
    }
    sha256_init(&(hctx->ctx));
    sha256_update(&(hctx->ctx), i_key_pad, SHA256_BLOCK_LENGTH);
    memset(i_key_pad, 0, sizeof(i_key_pad));
}

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hmac_sha256_update()

ICACHE_FLASH_ATTR void hmac_sha256_update	(	hmac_sha256_ctx_t *	hctx,
		uint8_t *	msg,
		uint32_t	msglen
	)

Definition at line 49 of file hmac-sha256.c.

References hmac_sha256_ctx_t::ctx, ICACHE_FLASH_ATTR, and sha256_update().

Referenced by decrypt_aes_hmac_combined(), encrypt_aes_hmac_combined(), and hmac_sha256().

                                                                                {
    sha256_update(&(hctx->ctx), msg, msglen);
}

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