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-rw-r--r--crypto/cmac/cmac.c424
1 files changed, 206 insertions, 218 deletions
diff --git a/crypto/cmac/cmac.c b/crypto/cmac/cmac.c
index 8b72b096813c..c5597a3f73b9 100644
--- a/crypto/cmac/cmac.c
+++ b/crypto/cmac/cmac.c
@@ -1,5 +1,6 @@
/* crypto/cmac/cmac.c */
-/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+/*
+ * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project.
*/
/* ====================================================================
@@ -10,7 +11,7 @@
* are met:
*
* 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
+ * 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
@@ -58,251 +59,238 @@
#include <openssl/cmac.h>
#ifdef OPENSSL_FIPS
-#include <openssl/fips.h>
+# include <openssl/fips.h>
#endif
-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;
- };
-
+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, unsigned char *l, int bl)
- {
- int i;
- /* Shift block to left, including carry */
- for (i = 0; i < bl; i++)
- {
- k1[i] = l[i] << 1;
- if (i < bl - 1 && l[i + 1] & 0x80)
- k1[i] |= 1;
- }
- /* If MSB set fixup with R */
- if (l[0] & 0x80)
- k1[bl - 1] ^= bl == 16 ? 0x87 : 0x1b;
- }
+{
+ int i;
+ /* Shift block to left, including carry */
+ for (i = 0; i < bl; i++) {
+ k1[i] = l[i] << 1;
+ if (i < bl - 1 && l[i + 1] & 0x80)
+ k1[i] |= 1;
+ }
+ /* If MSB set fixup with R */
+ if (l[0] & 0x80)
+ k1[bl - 1] ^= bl == 16 ? 0x87 : 0x1b;
+}
CMAC_CTX *CMAC_CTX_new(void)
- {
- CMAC_CTX *ctx;
- ctx = OPENSSL_malloc(sizeof(CMAC_CTX));
- if (!ctx)
- return NULL;
- EVP_CIPHER_CTX_init(&ctx->cctx);
- ctx->nlast_block = -1;
- return ctx;
- }
+{
+ CMAC_CTX *ctx;
+ ctx = OPENSSL_malloc(sizeof(CMAC_CTX));
+ if (!ctx)
+ return NULL;
+ EVP_CIPHER_CTX_init(&ctx->cctx);
+ ctx->nlast_block = -1;
+ return ctx;
+}
void CMAC_CTX_cleanup(CMAC_CTX *ctx)
- {
+{
#ifdef OPENSSL_FIPS
- if (FIPS_mode() && !ctx->cctx.engine)
- {
- FIPS_cmac_ctx_cleanup(ctx);
- return;
- }
+ if (FIPS_mode() && !ctx->cctx.engine) {
+ FIPS_cmac_ctx_cleanup(ctx);
+ return;
+ }
#endif
- EVP_CIPHER_CTX_cleanup(&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_cleanup(&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;
- }
+{
+ return &ctx->cctx;
+}
void CMAC_CTX_free(CMAC_CTX *ctx)
- {
- CMAC_CTX_cleanup(ctx);
- OPENSSL_free(ctx);
- }
+{
+ CMAC_CTX_cleanup(ctx);
+ 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 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 unsigned char zero_iv[EVP_MAX_BLOCK_LENGTH];
+int CMAC_Init(CMAC_CTX *ctx, const void *key, size_t keylen,
+ const EVP_CIPHER *cipher, ENGINE *impl)
+{
+ static unsigned char zero_iv[EVP_MAX_BLOCK_LENGTH];
#ifdef OPENSSL_FIPS
- if (FIPS_mode())
- {
- /* If we have an ENGINE need to allow non FIPS */
- if ((impl || ctx->cctx.engine)
- && !(ctx->cctx.flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW))
-
- {
- EVPerr(EVP_F_CMAC_INIT, EVP_R_DISABLED_FOR_FIPS);
- return 0;
- }
- /* Other algorithm blocking will be done in FIPS_cmac_init,
- * via FIPS_cipherinit().
- */
- if (!impl && !ctx->cctx.engine)
- return FIPS_cmac_init(ctx, key, keylen, cipher, NULL);
- }
+ if (FIPS_mode()) {
+ /* If we have an ENGINE need to allow non FIPS */
+ if ((impl || ctx->cctx.engine)
+ && !(ctx->cctx.flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW)) {
+ EVPerr(EVP_F_CMAC_INIT, EVP_R_DISABLED_FOR_FIPS);
+ return 0;
+ }
+ /*
+ * Other algorithm blocking will be done in FIPS_cmac_init, via
+ * FIPS_cipherinit().
+ */
+ if (!impl && !ctx->cctx.engine)
+ return FIPS_cmac_init(ctx, key, keylen, cipher, NULL);
+ }
#endif
- /* 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;
- }
- /* Initialiase 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;
- }
+ /* 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;
+ }
+ /* Initialiase 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;
+{
+ const unsigned char *data = in;
+ size_t bl;
#ifdef OPENSSL_FIPS
- if (FIPS_mode() && !ctx->cctx.engine)
- return FIPS_cmac_update(ctx, in, dlen);
+ if (FIPS_mode() && !ctx->cctx.engine)
+ return FIPS_cmac_update(ctx, in, dlen);
#endif
- 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;
+ 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;
+{
+ int i, bl, lb;
#ifdef OPENSSL_FIPS
- if (FIPS_mode() && !ctx->cctx.engine)
- return FIPS_cmac_final(ctx, out, poutlen);
+ if (FIPS_mode() && !ctx->cctx.engine)
+ return FIPS_cmac_final(ctx, out, poutlen);
#endif
- 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;
- }
+ 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" containes 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 reinitliasing 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);
- }
+{
+ if (ctx->nlast_block == -1)
+ return 0;
+ /*
+ * The buffer "tbl" containes 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 reinitliasing 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);
+}