mirror of
https://github.com/pineappleEA/pineapple-src.git
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277 lines
7.4 KiB
C
277 lines
7.4 KiB
C
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/* $OpenBSD: hmac.c,v 1.25 2018/02/17 14:53:58 jsing Exp $ */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <openssl/err.h>
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#include <openssl/hmac.h>
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int
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HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md,
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ENGINE *impl)
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{
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int i, j, reset = 0;
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unsigned char pad[HMAC_MAX_MD_CBLOCK];
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/* If we are changing MD then we must have a key */
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if (md != NULL && md != ctx->md && (key == NULL || len < 0))
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return 0;
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if (md != NULL) {
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reset = 1;
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ctx->md = md;
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} else if (ctx->md != NULL)
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md = ctx->md;
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else
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return 0;
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if (key != NULL) {
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reset = 1;
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j = EVP_MD_block_size(md);
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if ((size_t)j > sizeof(ctx->key)) {
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EVPerror(EVP_R_BAD_BLOCK_LENGTH);
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goto err;
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}
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if (j < len) {
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if (!EVP_DigestInit_ex(&ctx->md_ctx, md, impl))
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goto err;
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if (!EVP_DigestUpdate(&ctx->md_ctx, key, len))
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goto err;
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if (!EVP_DigestFinal_ex(&(ctx->md_ctx), ctx->key,
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&ctx->key_length))
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goto err;
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} else {
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if (len < 0 || (size_t)len > sizeof(ctx->key)) {
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EVPerror(EVP_R_BAD_KEY_LENGTH);
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goto err;
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}
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memcpy(ctx->key, key, len);
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ctx->key_length = len;
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}
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if (ctx->key_length != HMAC_MAX_MD_CBLOCK)
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memset(&ctx->key[ctx->key_length], 0,
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HMAC_MAX_MD_CBLOCK - ctx->key_length);
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}
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if (reset) {
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for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++)
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pad[i] = 0x36 ^ ctx->key[i];
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if (!EVP_DigestInit_ex(&ctx->i_ctx, md, impl))
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goto err;
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if (!EVP_DigestUpdate(&ctx->i_ctx, pad, EVP_MD_block_size(md)))
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goto err;
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for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++)
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pad[i] = 0x5c ^ ctx->key[i];
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if (!EVP_DigestInit_ex(&ctx->o_ctx, md, impl))
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goto err;
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if (!EVP_DigestUpdate(&ctx->o_ctx, pad, EVP_MD_block_size(md)))
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goto err;
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}
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if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->i_ctx))
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goto err;
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return 1;
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err:
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return 0;
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}
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int
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HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md)
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{
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if (key && md)
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HMAC_CTX_init(ctx);
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return HMAC_Init_ex(ctx, key, len, md, NULL);
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}
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int
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HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len)
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{
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if (ctx->md == NULL)
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return 0;
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return EVP_DigestUpdate(&ctx->md_ctx, data, len);
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}
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int
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HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len)
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{
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unsigned int i;
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unsigned char buf[EVP_MAX_MD_SIZE];
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if (ctx->md == NULL)
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goto err;
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if (!EVP_DigestFinal_ex(&ctx->md_ctx, buf, &i))
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goto err;
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if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->o_ctx))
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goto err;
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if (!EVP_DigestUpdate(&ctx->md_ctx, buf, i))
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goto err;
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if (!EVP_DigestFinal_ex(&ctx->md_ctx, md, len))
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goto err;
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return 1;
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err:
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return 0;
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}
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HMAC_CTX *
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HMAC_CTX_new(void)
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{
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HMAC_CTX *ctx;
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if ((ctx = calloc(1, sizeof(*ctx))) == NULL)
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return NULL;
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HMAC_CTX_init(ctx);
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return ctx;
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}
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void
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HMAC_CTX_free(HMAC_CTX *ctx)
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{
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if (ctx == NULL)
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return;
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HMAC_CTX_cleanup(ctx);
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free(ctx);
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}
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int
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HMAC_CTX_reset(HMAC_CTX *ctx)
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{
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HMAC_CTX_cleanup(ctx);
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HMAC_CTX_init(ctx);
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return 1;
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}
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void
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HMAC_CTX_init(HMAC_CTX *ctx)
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{
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EVP_MD_CTX_init(&ctx->i_ctx);
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EVP_MD_CTX_init(&ctx->o_ctx);
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EVP_MD_CTX_init(&ctx->md_ctx);
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ctx->md = NULL;
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}
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int
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HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx)
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{
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if (!EVP_MD_CTX_copy(&dctx->i_ctx, &sctx->i_ctx))
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goto err;
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if (!EVP_MD_CTX_copy(&dctx->o_ctx, &sctx->o_ctx))
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goto err;
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if (!EVP_MD_CTX_copy(&dctx->md_ctx, &sctx->md_ctx))
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goto err;
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memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK);
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dctx->key_length = sctx->key_length;
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dctx->md = sctx->md;
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return 1;
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err:
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return 0;
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}
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void
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HMAC_CTX_cleanup(HMAC_CTX *ctx)
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{
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EVP_MD_CTX_cleanup(&ctx->i_ctx);
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EVP_MD_CTX_cleanup(&ctx->o_ctx);
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EVP_MD_CTX_cleanup(&ctx->md_ctx);
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explicit_bzero(ctx, sizeof(*ctx));
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}
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void
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HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags)
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{
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EVP_MD_CTX_set_flags(&ctx->i_ctx, flags);
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EVP_MD_CTX_set_flags(&ctx->o_ctx, flags);
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EVP_MD_CTX_set_flags(&ctx->md_ctx, flags);
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}
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const EVP_MD *
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HMAC_CTX_get_md(const HMAC_CTX *ctx)
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{
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return ctx->md;
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}
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unsigned char *
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HMAC(const EVP_MD *evp_md, const void *key, int key_len, const unsigned char *d,
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size_t n, unsigned char *md, unsigned int *md_len)
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{
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HMAC_CTX c;
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static unsigned char m[EVP_MAX_MD_SIZE];
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if (md == NULL)
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md = m;
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HMAC_CTX_init(&c);
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if (!HMAC_Init(&c, key, key_len, evp_md))
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goto err;
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if (!HMAC_Update(&c, d, n))
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goto err;
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if (!HMAC_Final(&c, md, md_len))
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goto err;
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HMAC_CTX_cleanup(&c);
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return md;
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err:
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HMAC_CTX_cleanup(&c);
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return NULL;
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}
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