--- /dev/null
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ *
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to. The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code. The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ *
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * "This product includes cryptographic software written by
+ * Eric Young (eay@cryptsoft.com)"
+ * The word 'cryptographic' can be left out if the rouines from the library
+ * being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ * the apps directory (application code) you must include an acknowledgement:
+ * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed. i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.] */
+
+#include <openssl/hmac.h>
+
+#include <assert.h>
+#include <string.h>
+
+#include <openssl/digest.h>
+#include <openssl/mem.h>
+
+#include "../../internal.h"
+
+
+uint8_t *HMAC(const EVP_MD *evp_md, const void *key, size_t key_len,
+ const uint8_t *data, size_t data_len, uint8_t *out,
+ unsigned int *out_len) {
+ HMAC_CTX ctx;
+ HMAC_CTX_init(&ctx);
+ if (!HMAC_Init_ex(&ctx, key, key_len, evp_md, NULL) ||
+ !HMAC_Update(&ctx, data, data_len) ||
+ !HMAC_Final(&ctx, out, out_len)) {
+ out = NULL;
+ }
+
+ HMAC_CTX_cleanup(&ctx);
+ return out;
+}
+
+void HMAC_CTX_init(HMAC_CTX *ctx) {
+ ctx->md = NULL;
+ EVP_MD_CTX_init(&ctx->i_ctx);
+ EVP_MD_CTX_init(&ctx->o_ctx);
+ EVP_MD_CTX_init(&ctx->md_ctx);
+}
+
+HMAC_CTX *HMAC_CTX_new(void) {
+ HMAC_CTX *ctx = OPENSSL_malloc(sizeof(HMAC_CTX));
+ if (ctx != NULL) {
+ HMAC_CTX_init(ctx);
+ }
+ return ctx;
+}
+
+void HMAC_CTX_cleanup(HMAC_CTX *ctx) {
+ EVP_MD_CTX_cleanup(&ctx->i_ctx);
+ EVP_MD_CTX_cleanup(&ctx->o_ctx);
+ EVP_MD_CTX_cleanup(&ctx->md_ctx);
+ OPENSSL_cleanse(ctx, sizeof(HMAC_CTX));
+}
+
+void HMAC_CTX_free(HMAC_CTX *ctx) {
+ if (ctx == NULL) {
+ return;
+ }
+
+ HMAC_CTX_cleanup(ctx);
+ OPENSSL_free(ctx);
+}
+
+int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, size_t key_len,
+ const EVP_MD *md, ENGINE *impl) {
+ if (md == NULL) {
+ md = ctx->md;
+ }
+
+ // If either |key| is non-NULL or |md| has changed, initialize with a new key
+ // rather than rewinding the previous one.
+ //
+ // TODO(davidben,eroman): Passing the previous |md| with a NULL |key| is
+ // ambiguous between using the empty key and reusing the previous key. There
+ // exist callers which intend the latter, but the former is an awkward edge
+ // case. Fix to API to avoid this.
+ if (md != ctx->md || key != NULL) {
+ uint8_t pad[EVP_MAX_MD_BLOCK_SIZE];
+ uint8_t key_block[EVP_MAX_MD_BLOCK_SIZE];
+ unsigned key_block_len;
+
+ size_t block_size = EVP_MD_block_size(md);
+ assert(block_size <= sizeof(key_block));
+ if (block_size < key_len) {
+ // Long keys are hashed.
+ if (!EVP_DigestInit_ex(&ctx->md_ctx, md, impl) ||
+ !EVP_DigestUpdate(&ctx->md_ctx, key, key_len) ||
+ !EVP_DigestFinal_ex(&ctx->md_ctx, key_block, &key_block_len)) {
+ return 0;
+ }
+ } else {
+ assert(key_len <= sizeof(key_block));
+ OPENSSL_memcpy(key_block, key, key_len);
+ key_block_len = (unsigned)key_len;
+ }
+ // Keys are then padded with zeros.
+ if (key_block_len != EVP_MAX_MD_BLOCK_SIZE) {
+ OPENSSL_memset(&key_block[key_block_len], 0, sizeof(key_block) - key_block_len);
+ }
+
+ for (size_t i = 0; i < EVP_MAX_MD_BLOCK_SIZE; i++) {
+ pad[i] = 0x36 ^ key_block[i];
+ }
+ if (!EVP_DigestInit_ex(&ctx->i_ctx, md, impl) ||
+ !EVP_DigestUpdate(&ctx->i_ctx, pad, EVP_MD_block_size(md))) {
+ return 0;
+ }
+
+ for (size_t i = 0; i < EVP_MAX_MD_BLOCK_SIZE; i++) {
+ pad[i] = 0x5c ^ key_block[i];
+ }
+ if (!EVP_DigestInit_ex(&ctx->o_ctx, md, impl) ||
+ !EVP_DigestUpdate(&ctx->o_ctx, pad, EVP_MD_block_size(md))) {
+ return 0;
+ }
+
+ ctx->md = md;
+ }
+
+ if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->i_ctx)) {
+ return 0;
+ }
+
+ return 1;
+}
+
+int HMAC_Update(HMAC_CTX *ctx, const uint8_t *data, size_t data_len) {
+ return EVP_DigestUpdate(&ctx->md_ctx, data, data_len);
+}
+
+int HMAC_Final(HMAC_CTX *ctx, uint8_t *out, unsigned int *out_len) {
+ unsigned int i;
+ uint8_t buf[EVP_MAX_MD_SIZE];
+
+ // TODO(davidben): The only thing that can officially fail here is
+ // |EVP_MD_CTX_copy_ex|, but even that should be impossible in this case.
+ if (!EVP_DigestFinal_ex(&ctx->md_ctx, buf, &i) ||
+ !EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->o_ctx) ||
+ !EVP_DigestUpdate(&ctx->md_ctx, buf, i) ||
+ !EVP_DigestFinal_ex(&ctx->md_ctx, out, out_len)) {
+ *out_len = 0;
+ return 0;
+ }
+
+ return 1;
+}
+
+size_t HMAC_size(const HMAC_CTX *ctx) {
+ return EVP_MD_size(ctx->md);
+}
+
+int HMAC_CTX_copy_ex(HMAC_CTX *dest, const HMAC_CTX *src) {
+ if (!EVP_MD_CTX_copy_ex(&dest->i_ctx, &src->i_ctx) ||
+ !EVP_MD_CTX_copy_ex(&dest->o_ctx, &src->o_ctx) ||
+ !EVP_MD_CTX_copy_ex(&dest->md_ctx, &src->md_ctx)) {
+ return 0;
+ }
+
+ dest->md = src->md;
+ return 1;
+}
+
+void HMAC_CTX_reset(HMAC_CTX *ctx) {
+ HMAC_CTX_cleanup(ctx);
+ HMAC_CTX_init(ctx);
+}
+
+int HMAC_Init(HMAC_CTX *ctx, const void *key, int key_len, const EVP_MD *md) {
+ if (key && md) {
+ HMAC_CTX_init(ctx);
+ }
+ return HMAC_Init_ex(ctx, key, key_len, md, NULL);
+}
+
+int HMAC_CTX_copy(HMAC_CTX *dest, const HMAC_CTX *src) {
+ HMAC_CTX_init(dest);
+ return HMAC_CTX_copy_ex(dest, src);
+}
git://repos.xcallymotion.com / motion2.git / blobdiff