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authorWojtek Kosior <wk@koszkonutek-tmp.pl.eu.org>2021-04-30 00:33:56 +0200
committerWojtek Kosior <wk@koszkonutek-tmp.pl.eu.org>2021-04-30 00:33:56 +0200
commitaa4d426b4d3527d7e166df1a05058c9a4a0f6683 (patch)
tree4ff17ce8b89a2321b9d0ed4bcfc37c447bcb6820 /openssl-1.1.0h/crypto/cmac/cmac.c
downloadsmtps-and-pop3s-console-program-master.tar.gz
smtps-and-pop3s-console-program-master.zip
initial/final commitHEADmaster
Diffstat (limited to 'openssl-1.1.0h/crypto/cmac/cmac.c')
-rw-r--r--openssl-1.1.0h/crypto/cmac/cmac.c224
1 files changed, 224 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/cmac/cmac.c b/openssl-1.1.0h/crypto/cmac/cmac.c
new file mode 100644
index 0000000..46e3cb7
--- /dev/null
+++ b/openssl-1.1.0h/crypto/cmac/cmac.c
@@ -0,0 +1,224 @@
+/*
+ * Copyright 2010-2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "internal/cryptlib.h"
+#include <openssl/cmac.h>
+
+struct CMAC_CTX_st {
+ /* Cipher context to use */
+ EVP_CIPHER_CTX *cctx;
+ /* Keys k1 and k2 */
+ unsigned char k1[EVP_MAX_BLOCK_LENGTH];
+ unsigned char k2[EVP_MAX_BLOCK_LENGTH];
+ /* Temporary block */
+ unsigned char tbl[EVP_MAX_BLOCK_LENGTH];
+ /* Last (possibly partial) block */
+ unsigned char last_block[EVP_MAX_BLOCK_LENGTH];
+ /* Number of bytes in last block: -1 means context not initialised */
+ int nlast_block;
+};
+
+/* Make temporary keys K1 and K2 */
+
+static void make_kn(unsigned char *k1, const unsigned char *l, int bl)
+{
+ int i;
+ unsigned char c = l[0], carry = c >> 7, cnext;
+
+ /* Shift block to left, including carry */
+ for (i = 0; i < bl - 1; i++, c = cnext)
+ k1[i] = (c << 1) | ((cnext = l[i + 1]) >> 7);
+
+ /* If MSB set fixup with R */
+ k1[i] = (c << 1) ^ ((0 - carry) & (bl == 16 ? 0x87 : 0x1b));
+}
+
+CMAC_CTX *CMAC_CTX_new(void)
+{
+ CMAC_CTX *ctx;
+
+ ctx = OPENSSL_malloc(sizeof(*ctx));
+ if (ctx == NULL)
+ return NULL;
+ ctx->cctx = EVP_CIPHER_CTX_new();
+ if (ctx->cctx == NULL) {
+ OPENSSL_free(ctx);
+ return NULL;
+ }
+ ctx->nlast_block = -1;
+ return ctx;
+}
+
+void CMAC_CTX_cleanup(CMAC_CTX *ctx)
+{
+ EVP_CIPHER_CTX_reset(ctx->cctx);
+ OPENSSL_cleanse(ctx->tbl, EVP_MAX_BLOCK_LENGTH);
+ OPENSSL_cleanse(ctx->k1, EVP_MAX_BLOCK_LENGTH);
+ OPENSSL_cleanse(ctx->k2, EVP_MAX_BLOCK_LENGTH);
+ OPENSSL_cleanse(ctx->last_block, EVP_MAX_BLOCK_LENGTH);
+ ctx->nlast_block = -1;
+}
+
+EVP_CIPHER_CTX *CMAC_CTX_get0_cipher_ctx(CMAC_CTX *ctx)
+{
+ return ctx->cctx;
+}
+
+void CMAC_CTX_free(CMAC_CTX *ctx)
+{
+ if (!ctx)
+ return;
+ CMAC_CTX_cleanup(ctx);
+ EVP_CIPHER_CTX_free(ctx->cctx);
+ OPENSSL_free(ctx);
+}
+
+int CMAC_CTX_copy(CMAC_CTX *out, const CMAC_CTX *in)
+{
+ int bl;
+ if (in->nlast_block == -1)
+ return 0;
+ if (!EVP_CIPHER_CTX_copy(out->cctx, in->cctx))
+ return 0;
+ bl = EVP_CIPHER_CTX_block_size(in->cctx);
+ memcpy(out->k1, in->k1, bl);
+ memcpy(out->k2, in->k2, bl);
+ memcpy(out->tbl, in->tbl, bl);
+ memcpy(out->last_block, in->last_block, bl);
+ out->nlast_block = in->nlast_block;
+ return 1;
+}
+
+int CMAC_Init(CMAC_CTX *ctx, const void *key, size_t keylen,
+ const EVP_CIPHER *cipher, ENGINE *impl)
+{
+ static const unsigned char zero_iv[EVP_MAX_BLOCK_LENGTH] = { 0 };
+ /* All zeros means restart */
+ if (!key && !cipher && !impl && keylen == 0) {
+ /* Not initialised */
+ if (ctx->nlast_block == -1)
+ return 0;
+ if (!EVP_EncryptInit_ex(ctx->cctx, NULL, NULL, NULL, zero_iv))
+ return 0;
+ memset(ctx->tbl, 0, EVP_CIPHER_CTX_block_size(ctx->cctx));
+ ctx->nlast_block = 0;
+ return 1;
+ }
+ /* Initialise context */
+ if (cipher && !EVP_EncryptInit_ex(ctx->cctx, cipher, impl, NULL, NULL))
+ return 0;
+ /* Non-NULL key means initialisation complete */
+ if (key) {
+ int bl;
+ if (!EVP_CIPHER_CTX_cipher(ctx->cctx))
+ return 0;
+ if (!EVP_CIPHER_CTX_set_key_length(ctx->cctx, keylen))
+ return 0;
+ if (!EVP_EncryptInit_ex(ctx->cctx, NULL, NULL, key, zero_iv))
+ return 0;
+ bl = EVP_CIPHER_CTX_block_size(ctx->cctx);
+ if (!EVP_Cipher(ctx->cctx, ctx->tbl, zero_iv, bl))
+ return 0;
+ make_kn(ctx->k1, ctx->tbl, bl);
+ make_kn(ctx->k2, ctx->k1, bl);
+ OPENSSL_cleanse(ctx->tbl, bl);
+ /* Reset context again ready for first data block */
+ if (!EVP_EncryptInit_ex(ctx->cctx, NULL, NULL, NULL, zero_iv))
+ return 0;
+ /* Zero tbl so resume works */
+ memset(ctx->tbl, 0, bl);
+ ctx->nlast_block = 0;
+ }
+ return 1;
+}
+
+int CMAC_Update(CMAC_CTX *ctx, const void *in, size_t dlen)
+{
+ const unsigned char *data = in;
+ size_t bl;
+ if (ctx->nlast_block == -1)
+ return 0;
+ if (dlen == 0)
+ return 1;
+ bl = EVP_CIPHER_CTX_block_size(ctx->cctx);
+ /* Copy into partial block if we need to */
+ if (ctx->nlast_block > 0) {
+ size_t nleft;
+ nleft = bl - ctx->nlast_block;
+ if (dlen < nleft)
+ nleft = dlen;
+ memcpy(ctx->last_block + ctx->nlast_block, data, nleft);
+ dlen -= nleft;
+ ctx->nlast_block += nleft;
+ /* If no more to process return */
+ if (dlen == 0)
+ return 1;
+ data += nleft;
+ /* Else not final block so encrypt it */
+ if (!EVP_Cipher(ctx->cctx, ctx->tbl, ctx->last_block, bl))
+ return 0;
+ }
+ /* Encrypt all but one of the complete blocks left */
+ while (dlen > bl) {
+ if (!EVP_Cipher(ctx->cctx, ctx->tbl, data, bl))
+ return 0;
+ dlen -= bl;
+ data += bl;
+ }
+ /* Copy any data left to last block buffer */
+ memcpy(ctx->last_block, data, dlen);
+ ctx->nlast_block = dlen;
+ return 1;
+
+}
+
+int CMAC_Final(CMAC_CTX *ctx, unsigned char *out, size_t *poutlen)
+{
+ int i, bl, lb;
+ if (ctx->nlast_block == -1)
+ return 0;
+ bl = EVP_CIPHER_CTX_block_size(ctx->cctx);
+ *poutlen = (size_t)bl;
+ if (!out)
+ return 1;
+ lb = ctx->nlast_block;
+ /* Is last block complete? */
+ if (lb == bl) {
+ for (i = 0; i < bl; i++)
+ out[i] = ctx->last_block[i] ^ ctx->k1[i];
+ } else {
+ ctx->last_block[lb] = 0x80;
+ if (bl - lb > 1)
+ memset(ctx->last_block + lb + 1, 0, bl - lb - 1);
+ for (i = 0; i < bl; i++)
+ out[i] = ctx->last_block[i] ^ ctx->k2[i];
+ }
+ if (!EVP_Cipher(ctx->cctx, out, out, bl)) {
+ OPENSSL_cleanse(out, bl);
+ return 0;
+ }
+ return 1;
+}
+
+int CMAC_resume(CMAC_CTX *ctx)
+{
+ if (ctx->nlast_block == -1)
+ return 0;
+ /*
+ * The buffer "tbl" contains the last fully encrypted block which is the
+ * last IV (or all zeroes if no last encrypted block). The last block has
+ * not been modified since CMAC_final(). So reinitialising using the last
+ * decrypted block will allow CMAC to continue after calling
+ * CMAC_Final().
+ */
+ return EVP_EncryptInit_ex(ctx->cctx, NULL, NULL, NULL, ctx->tbl);
+}
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