summaryrefslogtreecommitdiffstats
path: root/src/crypto/hmac/hmac.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/crypto/hmac/hmac.c')
-rw-r--r--src/crypto/hmac/hmac.c225
1 files changed, 225 insertions, 0 deletions
diff --git a/src/crypto/hmac/hmac.c b/src/crypto/hmac/hmac.c
new file mode 100644
index 0000000..f179fed
--- /dev/null
+++ b/src/crypto/hmac/hmac.c
@@ -0,0 +1,225 @@
+/* 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/mem.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;
+ static uint8_t static_out_buffer[EVP_MAX_MD_SIZE];
+
+ /* OpenSSL has traditionally supported using a static buffer if |out| is
+ * NULL. We maintain that but don't document it. This behaviour should be
+ * considered to be deprecated. */
+ if (out == NULL) {
+ out = static_out_buffer;
+ }
+
+ HMAC_CTX_init(&ctx);
+ if (!HMAC_Init(&ctx, key, key_len, evp_md) ||
+ !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;
+ ctx->key_length = 0;
+ EVP_MD_CTX_init(&ctx->i_ctx);
+ EVP_MD_CTX_init(&ctx->o_ctx);
+ EVP_MD_CTX_init(&ctx->md_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(ctx));
+}
+
+int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, size_t key_len,
+ const EVP_MD *md, ENGINE *impl) {
+ unsigned i, reset = 0;
+ uint8_t pad[HMAC_MAX_MD_CBLOCK];
+
+ if (md != NULL) {
+ if (ctx->md == NULL && key == NULL && ctx->key_length == 0) {
+ /* TODO(eroman): Change the API instead of this hack.
+ * If a key hasn't yet been assigned to the context, then default to using
+ * an all-zero key. This is to work around callers of
+ * HMAC_Init_ex(key=NULL, key_len=0) intending to set a zero-length key.
+ * Rather than resulting in uninitialized memory reads, it will
+ * predictably use a zero key. */
+ memset(ctx->key, 0, sizeof(ctx->key));
+ }
+ reset = 1;
+ ctx->md = md;
+ } else {
+ md = ctx->md;
+ }
+
+ if (key != NULL) {
+ size_t block_size = EVP_MD_block_size(md);
+ reset = 1;
+ assert(block_size <= sizeof(ctx->key));
+ if (block_size < key_len) {
+ if (!EVP_DigestInit_ex(&ctx->md_ctx, md, impl) ||
+ !EVP_DigestUpdate(&ctx->md_ctx, key, key_len) ||
+ !EVP_DigestFinal_ex(&(ctx->md_ctx), ctx->key, &ctx->key_length)) {
+ goto err;
+ }
+ } else {
+ assert(key_len >= 0 && key_len <= sizeof(ctx->key));
+ memcpy(ctx->key, key, key_len);
+ ctx->key_length = key_len;
+ }
+ if (ctx->key_length != HMAC_MAX_MD_CBLOCK) {
+ memset(&ctx->key[ctx->key_length], 0, sizeof(ctx->key) - ctx->key_length);
+ }
+ }
+
+ if (reset) {
+ for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++) {
+ pad[i] = 0x36 ^ ctx->key[i];
+ }
+ if (!EVP_DigestInit_ex(&ctx->i_ctx, md, impl) ||
+ !EVP_DigestUpdate(&ctx->i_ctx, pad, EVP_MD_block_size(md))) {
+ goto err;
+ }
+
+ for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++) {
+ pad[i] = 0x5c ^ ctx->key[i];
+ }
+ if (!EVP_DigestInit_ex(&ctx->o_ctx, md, impl) ||
+ !EVP_DigestUpdate(&ctx->o_ctx, pad, EVP_MD_block_size(md))) {
+ goto err;
+ }
+ }
+
+ if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->i_ctx)) {
+ goto err;
+ }
+
+ return 1;
+
+err:
+ return 0;
+}
+
+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];
+
+ 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;
+ }
+
+ memcpy(dest->key, src->key, HMAC_MAX_MD_CBLOCK);
+ dest->key_length = src->key_length;
+ dest->md = src->md;
+ return 1;
+}
+
+void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags) {
+ EVP_MD_CTX_set_flags(&ctx->i_ctx, flags);
+ EVP_MD_CTX_set_flags(&ctx->o_ctx, flags);
+ EVP_MD_CTX_set_flags(&ctx->md_ctx, flags);
+}
+
+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);
+}
generated by cgit v1.1 at 2024-08-06 23:19:27 +0000