diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index c1f08f9d38..33b89ef469 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -350,39 +350,7 @@
  */
 //#define MBEDTLS_TIMING_ALT
 
-/**
- * \def MBEDTLS_AES_ALT
- *
- * MBEDTLS__MODULE_NAME__ALT: Uncomment a macro to let Mbed TLS use your
- * alternate core implementation of a symmetric crypto, an arithmetic or hash
- * module (e.g. platform specific assembly optimized implementations). Keep
- * in mind that the function prototypes should remain the same.
- *
- * This replaces the whole module. If you only want to replace one of the
- * functions, use one of the MBEDTLS__FUNCTION_NAME__ALT flags.
- *
- * Example: In case you uncomment MBEDTLS_AES_ALT, Mbed TLS will no longer
- * provide the "struct mbedtls_aes_context" definition and omit the base
- * function declarations and implementations. "aes_alt.h" will be included from
- * "aes.h" to include the new function definitions.
- *
- * Uncomment a macro to enable alternate implementation of the corresponding
- * module.
- *
- * \warning   MD5, DES and SHA-1 are considered weak and their
- *            use constitutes a security risk. If possible, we recommend
- *            avoiding dependencies on them, and considering stronger message
- *            digests and ciphers instead.
- *
- */
-//#define MBEDTLS_AES_ALT
-//#define MBEDTLS_ARIA_ALT
-//#define MBEDTLS_CAMELLIA_ALT
-//#define MBEDTLS_CCM_ALT
 //#define MBEDTLS_CMAC_ALT
-//#define MBEDTLS_DES_ALT
-//#define MBEDTLS_GCM_ALT
-//#define MBEDTLS_NIST_KW_ALT
 //#define MBEDTLS_MD5_ALT
 //#define MBEDTLS_RIPEMD160_ALT
 //#define MBEDTLS_SHA1_ALT
diff --git a/tests/include/alt-dummy/aes_alt.h b/tests/include/alt-dummy/aes_alt.h
deleted file mode 100644
index dc47dd16c5..0000000000
--- a/tests/include/alt-dummy/aes_alt.h
+++ /dev/null
@@ -1,23 +0,0 @@
-/* aes_alt.h with dummy types for MBEDTLS_AES_ALT */
-/*
- *  Copyright The Mbed TLS Contributors
- *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
- */
-
-#ifndef AES_ALT_H
-#define AES_ALT_H
-
-typedef struct mbedtls_aes_context {
-    int dummy;
-}
-mbedtls_aes_context;
-
-#if defined(MBEDTLS_CIPHER_MODE_XTS)
-
-typedef struct mbedtls_aes_xts_context {
-    int dummy;
-} mbedtls_aes_xts_context;
-#endif
-
-
-#endif /* aes_alt.h */
diff --git a/tests/include/alt-dummy/aria_alt.h b/tests/include/alt-dummy/aria_alt.h
deleted file mode 100644
index 94db8c7fb6..0000000000
--- a/tests/include/alt-dummy/aria_alt.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/* aria_alt.h with dummy types for MBEDTLS_ARIA_ALT */
-/*
- *  Copyright The Mbed TLS Contributors
- *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
- */
-
-#ifndef ARIA_ALT_H
-#define ARIA_ALT_H
-
-typedef struct mbedtls_aria_context {
-    int dummy;
-}
-mbedtls_aria_context;
-
-
-#endif /* aria_alt.h */
diff --git a/tests/include/alt-dummy/camellia_alt.h b/tests/include/alt-dummy/camellia_alt.h
deleted file mode 100644
index 97bc16b78f..0000000000
--- a/tests/include/alt-dummy/camellia_alt.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/* camellia_alt.h with dummy types for MBEDTLS_CAMELLIA_ALT */
-/*
- *  Copyright The Mbed TLS Contributors
- *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
- */
-
-#ifndef CAMELLIA_ALT_H
-#define CAMELLIA_ALT_H
-
-typedef struct mbedtls_camellia_context {
-    int dummy;
-}
-mbedtls_camellia_context;
-
-
-#endif /* camellia_alt.h */
diff --git a/tests/include/alt-dummy/ccm_alt.h b/tests/include/alt-dummy/ccm_alt.h
deleted file mode 100644
index c25f42b4a0..0000000000
--- a/tests/include/alt-dummy/ccm_alt.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/* ccm_alt.h with dummy types for MBEDTLS_CCM_ALT */
-/*
- *  Copyright The Mbed TLS Contributors
- *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
- */
-
-#ifndef CCM_ALT_H
-#define CCM_ALT_H
-
-typedef struct mbedtls_ccm_context {
-    int dummy;
-}
-mbedtls_ccm_context;
-
-
-#endif /* ccm_alt.h */
diff --git a/tests/include/alt-dummy/des_alt.h b/tests/include/alt-dummy/des_alt.h
deleted file mode 100644
index d079861289..0000000000
--- a/tests/include/alt-dummy/des_alt.h
+++ /dev/null
@@ -1,22 +0,0 @@
-/* des_alt.h with dummy types for MBEDTLS_DES_ALT */
-/*
- *  Copyright The Mbed TLS Contributors
- *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
- *
- */
-
-#ifndef DES_ALT_H
-#define DES_ALT_H
-
-typedef struct mbedtls_des_context {
-    int dummy;
-}
-mbedtls_des_context;
-
-typedef struct mbedtls_des3_context {
-    int dummy;
-}
-mbedtls_des3_context;
-
-
-#endif /* des_alt.h */
diff --git a/tests/include/alt-dummy/gcm_alt.h b/tests/include/alt-dummy/gcm_alt.h
deleted file mode 100644
index cfa73d2a42..0000000000
--- a/tests/include/alt-dummy/gcm_alt.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/* gcm_alt.h with dummy types for MBEDTLS_GCM_ALT */
-/*
- *  Copyright The Mbed TLS Contributors
- *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
- */
-
-#ifndef GCM_ALT_H
-#define GCM_ALT_H
-
-typedef struct mbedtls_gcm_context {
-    int dummy;
-}
-mbedtls_gcm_context;
-
-
-#endif /* gcm_alt.h */
diff --git a/tests/include/alt-dummy/nist_kw_alt.h b/tests/include/alt-dummy/nist_kw_alt.h
deleted file mode 100644
index 1274d40812..0000000000
--- a/tests/include/alt-dummy/nist_kw_alt.h
+++ /dev/null
@@ -1,15 +0,0 @@
-/* nist_kw_alt.h with dummy types for MBEDTLS_NIST_KW_ALT */
-/*
- *  Copyright The Mbed TLS Contributors
- *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
- */
-
-#ifndef NIST_KW_ALT_H
-#define NIST_KW_ALT_H
-
-typedef struct {
-    int dummy;
-} mbedtls_nist_kw_context;
-
-
-#endif /* nist_kw_alt.h */
diff --git a/tests/include/test/psa_crypto_helpers.h b/tests/include/test/psa_crypto_helpers.h
index 7393d81dc3..ea6e8c52dc 100644
--- a/tests/include/test/psa_crypto_helpers.h
+++ b/tests/include/test/psa_crypto_helpers.h
@@ -251,8 +251,7 @@ uint64_t mbedtls_test_parse_binary_string(data_t *bin_string);
  *  \param key_type  Key type
  *  \param key_bits  Key length in number of bits.
  */
-#if defined(MBEDTLS_AES_ALT) || \
-    defined(MBEDTLS_AES_SETKEY_ENC_ALT) || \
+#if defined(MBEDTLS_AES_SETKEY_ENC_ALT) || \
     defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_AES)
 #define MBEDTLS_TEST_HAVE_ALT_AES 1
 #else
@@ -294,18 +293,18 @@ uint64_t mbedtls_test_parse_binary_string(data_t *bin_string);
  *  \param  alg             The AEAD algorithm.
  *  \param  nonce_length    The nonce length in number of bytes.
  */
-#if defined(MBEDTLS_GCM_ALT) || \
-    defined(MBEDTLS_PSA_ACCEL_ALG_GCM)
-#define MBEDTLS_TEST_HAVE_ALT_GCM  1
+
+#if defined(MBEDTLS_PSA_ACCEL_ALG_GCM)
+#define MBEDTLS_TEST_HAVE_ACCEL_GCM  1
 #else
-#define MBEDTLS_TEST_HAVE_ALT_GCM  0
+#define MBEDTLS_TEST_HAVE_ACCEL_GCM  0
 #endif
 
 #define MBEDTLS_TEST_PSA_SKIP_IF_ALT_GCM_NOT_12BYTES_NONCE(alg,           \
                                                            nonce_length) \
     do                                                                     \
     {                                                                      \
-        if ((MBEDTLS_TEST_HAVE_ALT_GCM) &&                               \
+        if ((MBEDTLS_TEST_HAVE_ACCEL_GCM) &&                               \
             (PSA_ALG_AEAD_WITH_SHORTENED_TAG((alg), 0) ==            \
              PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_GCM, 0)) &&       \
             ((nonce_length) != 12))                                   \
diff --git a/tests/suites/test_suite_ccm.data b/tests/suites/test_suite_ccm.data
index 22150f7a71..e6818e7403 100644
--- a/tests/suites/test_suite_ccm.data
+++ b/tests/suites/test_suite_ccm.data
@@ -36,7 +36,6 @@ CCM lengths #6 tag length not even
 ccm_lengths:5:10:5:7:MBEDTLS_ERR_CCM_BAD_INPUT
 
 CCM lengths #7 AD too long (2^16 - 2^8)
-depends_on:!MBEDTLS_CCM_ALT
 ccm_lengths:5:10:65280:8:MBEDTLS_ERR_CCM_BAD_INPUT
 
 CCM lengths #8 msg too long for this IV length (2^16, q = 2)
diff --git a/tf-psa-crypto/drivers/builtin/include/mbedtls/aes.h b/tf-psa-crypto/drivers/builtin/include/mbedtls/aes.h
index a07c8a5f98..559e1d84e2 100644
--- a/tf-psa-crypto/drivers/builtin/include/mbedtls/aes.h
+++ b/tf-psa-crypto/drivers/builtin/include/mbedtls/aes.h
@@ -53,10 +53,6 @@
 extern "C" {
 #endif
 
-#if !defined(MBEDTLS_AES_ALT)
-// Regular implementation
-//
-
 /**
  * \brief The AES context-type definition.
  */
@@ -88,10 +84,6 @@ typedef struct mbedtls_aes_xts_context {
 } mbedtls_aes_xts_context;
 #endif /* MBEDTLS_CIPHER_MODE_XTS */
 
-#else  /* MBEDTLS_AES_ALT */
-#include "aes_alt.h"
-#endif /* MBEDTLS_AES_ALT */
-
 /**
  * \brief          This function initializes the specified AES context.
  *
diff --git a/tf-psa-crypto/drivers/builtin/include/mbedtls/aria.h b/tf-psa-crypto/drivers/builtin/include/mbedtls/aria.h
index c685fc3141..fa175f07c1 100644
--- a/tf-psa-crypto/drivers/builtin/include/mbedtls/aria.h
+++ b/tf-psa-crypto/drivers/builtin/include/mbedtls/aria.h
@@ -42,10 +42,6 @@
 extern "C" {
 #endif
 
-#if !defined(MBEDTLS_ARIA_ALT)
-// Regular implementation
-//
-
 /**
  * \brief The ARIA context-type definition.
  */
@@ -56,10 +52,6 @@ typedef struct mbedtls_aria_context {
 }
 mbedtls_aria_context;
 
-#else  /* MBEDTLS_ARIA_ALT */
-#include "aria_alt.h"
-#endif /* MBEDTLS_ARIA_ALT */
-
 /**
  * \brief          This function initializes the specified ARIA context.
  *
diff --git a/tf-psa-crypto/drivers/builtin/include/mbedtls/camellia.h b/tf-psa-crypto/drivers/builtin/include/mbedtls/camellia.h
index 557f472531..39266bf26c 100644
--- a/tf-psa-crypto/drivers/builtin/include/mbedtls/camellia.h
+++ b/tf-psa-crypto/drivers/builtin/include/mbedtls/camellia.h
@@ -31,10 +31,6 @@
 extern "C" {
 #endif
 
-#if !defined(MBEDTLS_CAMELLIA_ALT)
-// Regular implementation
-//
-
 /**
  * \brief          CAMELLIA context structure
  */
@@ -44,10 +40,6 @@ typedef struct mbedtls_camellia_context {
 }
 mbedtls_camellia_context;
 
-#else  /* MBEDTLS_CAMELLIA_ALT */
-#include "camellia_alt.h"
-#endif /* MBEDTLS_CAMELLIA_ALT */
-
 /**
  * \brief          Initialize a CAMELLIA context.
  *
diff --git a/tf-psa-crypto/drivers/builtin/include/mbedtls/ccm.h b/tf-psa-crypto/drivers/builtin/include/mbedtls/ccm.h
index 1da57c921b..67d173d7fc 100644
--- a/tf-psa-crypto/drivers/builtin/include/mbedtls/ccm.h
+++ b/tf-psa-crypto/drivers/builtin/include/mbedtls/ccm.h
@@ -58,10 +58,6 @@
 extern "C" {
 #endif
 
-#if !defined(MBEDTLS_CCM_ALT)
-// Regular implementation
-//
-
 /**
  * \brief    The CCM context-type definition. The CCM context is passed
  *           to the APIs called.
@@ -94,10 +90,6 @@ typedef struct mbedtls_ccm_context {
 }
 mbedtls_ccm_context;
 
-#else  /* MBEDTLS_CCM_ALT */
-#include "ccm_alt.h"
-#endif /* MBEDTLS_CCM_ALT */
-
 /**
  * \brief           This function initializes the specified CCM context,
  *                  to make references valid, and prepare the context
diff --git a/tf-psa-crypto/drivers/builtin/include/mbedtls/des.h b/tf-psa-crypto/drivers/builtin/include/mbedtls/des.h
index 2b097a13dd..c2d910cbfa 100644
--- a/tf-psa-crypto/drivers/builtin/include/mbedtls/des.h
+++ b/tf-psa-crypto/drivers/builtin/include/mbedtls/des.h
@@ -34,10 +34,6 @@
 extern "C" {
 #endif
 
-#if !defined(MBEDTLS_DES_ALT)
-// Regular implementation
-//
-
 /**
  * \brief          DES context structure
  *
@@ -62,9 +58,6 @@ typedef struct mbedtls_des3_context {
 }
 mbedtls_des3_context;
 
-#else  /* MBEDTLS_DES_ALT */
-#include "des_alt.h"
-#endif /* MBEDTLS_DES_ALT */
 
 /**
  * \brief          Initialize DES context
diff --git a/tf-psa-crypto/drivers/builtin/include/mbedtls/gcm.h b/tf-psa-crypto/drivers/builtin/include/mbedtls/gcm.h
index 98faa43612..72632fa41a 100644
--- a/tf-psa-crypto/drivers/builtin/include/mbedtls/gcm.h
+++ b/tf-psa-crypto/drivers/builtin/include/mbedtls/gcm.h
@@ -44,8 +44,6 @@
 extern "C" {
 #endif
 
-#if !defined(MBEDTLS_GCM_ALT)
-
 #if defined(MBEDTLS_GCM_LARGE_TABLE)
 #define MBEDTLS_GCM_HTABLE_SIZE 256
 #else
@@ -74,10 +72,6 @@ typedef struct mbedtls_gcm_context {
 }
 mbedtls_gcm_context;
 
-#else  /* !MBEDTLS_GCM_ALT */
-#include "gcm_alt.h"
-#endif /* !MBEDTLS_GCM_ALT */
-
 /**
  * \brief           This function initializes the specified GCM context,
  *                  to make references valid, and prepares the context
diff --git a/tf-psa-crypto/drivers/builtin/include/mbedtls/nist_kw.h b/tf-psa-crypto/drivers/builtin/include/mbedtls/nist_kw.h
index d353f3d1a8..a99d925076 100644
--- a/tf-psa-crypto/drivers/builtin/include/mbedtls/nist_kw.h
+++ b/tf-psa-crypto/drivers/builtin/include/mbedtls/nist_kw.h
@@ -37,10 +37,6 @@ typedef enum {
     MBEDTLS_KW_MODE_KWP = 1
 } mbedtls_nist_kw_mode_t;
 
-#if !defined(MBEDTLS_NIST_KW_ALT)
-// Regular implementation
-//
-
 /**
  * \brief    The key wrapping context-type definition. The key wrapping context is passed
  *           to the APIs called.
@@ -52,10 +48,6 @@ typedef struct {
     mbedtls_cipher_context_t MBEDTLS_PRIVATE(cipher_ctx);    /*!< The cipher context used. */
 } mbedtls_nist_kw_context;
 
-#else  /* MBEDTLS_NIST_key wrapping_ALT */
-#include "nist_kw_alt.h"
-#endif /* MBEDTLS_NIST_KW_ALT */
-
 /**
  * \brief           This function initializes the specified key wrapping context
  *                  to make references valid and prepare the context
diff --git a/tf-psa-crypto/drivers/builtin/src/aes.c b/tf-psa-crypto/drivers/builtin/src/aes.c
index 72e2c57450..67fa2d5841 100644
--- a/tf-psa-crypto/drivers/builtin/src/aes.c
+++ b/tf-psa-crypto/drivers/builtin/src/aes.c
@@ -50,8 +50,6 @@
 #define MBEDTLS_AES_NEED_REVERSE_TABLES
 #endif
 
-#if !defined(MBEDTLS_AES_ALT)
-
 #if defined(MBEDTLS_AES_ROM_TABLES)
 /*
  * Forward S-box
@@ -1436,8 +1434,6 @@ exit:
 }
 #endif /* MBEDTLS_CIPHER_MODE_CTR */
 
-#endif /* !MBEDTLS_AES_ALT */
-
 #if defined(MBEDTLS_SELF_TEST)
 /*
  * AES test vectors from:
@@ -1800,9 +1796,6 @@ int mbedtls_aes_self_test(int verbose)
     mbedtls_aes_init(&ctx);
 
     if (verbose != 0) {
-#if defined(MBEDTLS_AES_ALT)
-        mbedtls_printf("  AES note: alternative implementation.\n");
-#else /* MBEDTLS_AES_ALT */
 #if defined(MBEDTLS_AESNI_HAVE_CODE)
 #if MBEDTLS_AESNI_HAVE_CODE == 1
         mbedtls_printf("  AES note: AESNI code present (assembly implementation).\n");
@@ -1825,7 +1818,6 @@ int mbedtls_aes_self_test(int verbose)
             mbedtls_printf("  AES note: built-in implementation.\n");
 #endif
         }
-#endif /* MBEDTLS_AES_ALT */
     }
 
     /*
@@ -1868,8 +1860,9 @@ int mbedtls_aes_self_test(int verbose)
 
             /*
              * AES-192 is an optional feature that may be unavailable when
-             * there is an alternative underlying implementation i.e. when
-             * MBEDTLS_AES_ALT is defined.
+             * there is an alternative underlying implementation i.e when
+             * MBEDTLS_AES_SETKEY_ENC_ALT or MBEDTLS_AES_SETKEY_DEC_ALT
+             * are defined.
              */
             if (ret == MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED && keybits == 192) {
                 mbedtls_printf("skipped\n");
@@ -1932,8 +1925,9 @@ int mbedtls_aes_self_test(int verbose)
 
             /*
              * AES-192 is an optional feature that may be unavailable when
-             * there is an alternative underlying implementation i.e. when
-             * MBEDTLS_AES_ALT is defined.
+             * there is an alternative underlying implementation i.e when
+             * MBEDTLS_AES_SETKEY_ENC_ALT or MBEDTLS_AES_SETKEY_DEC_ALT
+             * are defined.
              */
             if (ret == MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED && keybits == 192) {
                 mbedtls_printf("skipped\n");
@@ -1999,8 +1993,9 @@ int mbedtls_aes_self_test(int verbose)
             ret = mbedtls_aes_setkey_enc(&ctx, key, keybits);
             /*
              * AES-192 is an optional feature that may be unavailable when
-             * there is an alternative underlying implementation i.e. when
-             * MBEDTLS_AES_ALT is defined.
+             * there is an alternative underlying implementation i.e when
+             * MBEDTLS_AES_SETKEY_ENC_ALT or MBEDTLS_AES_SETKEY_DEC_ALT
+             * are defined.
              */
             if (ret == MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED && keybits == 192) {
                 mbedtls_printf("skipped\n");
@@ -2063,8 +2058,9 @@ int mbedtls_aes_self_test(int verbose)
             ret = mbedtls_aes_setkey_enc(&ctx, key, keybits);
             /*
              * AES-192 is an optional feature that may be unavailable when
-             * there is an alternative underlying implementation i.e. when
-             * MBEDTLS_AES_ALT is defined.
+             * there is an alternative underlying implementation i.e when
+             * MBEDTLS_AES_SETKEY_ENC_ALT or MBEDTLS_AES_SETKEY_DEC_ALT
+             * are defined.
              */
             if (ret == MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED && keybits == 192) {
                 mbedtls_printf("skipped\n");
diff --git a/tf-psa-crypto/drivers/builtin/src/aria.c b/tf-psa-crypto/drivers/builtin/src/aria.c
index d9f84cc59d..f1958ee7db 100644
--- a/tf-psa-crypto/drivers/builtin/src/aria.c
+++ b/tf-psa-crypto/drivers/builtin/src/aria.c
@@ -21,8 +21,6 @@
 
 #include "mbedtls/platform.h"
 
-#if !defined(MBEDTLS_ARIA_ALT)
-
 #include "mbedtls/platform_util.h"
 
 /*
@@ -657,7 +655,6 @@ int mbedtls_aria_crypt_ctr(mbedtls_aria_context *ctx,
     return 0;
 }
 #endif /* MBEDTLS_CIPHER_MODE_CTR */
-#endif /* !MBEDTLS_ARIA_ALT */
 
 #if defined(MBEDTLS_SELF_TEST)
 
diff --git a/tf-psa-crypto/drivers/builtin/src/camellia.c b/tf-psa-crypto/drivers/builtin/src/camellia.c
index b1c0a08ca2..d863699f19 100644
--- a/tf-psa-crypto/drivers/builtin/src/camellia.c
+++ b/tf-psa-crypto/drivers/builtin/src/camellia.c
@@ -22,8 +22,6 @@
 
 #include "mbedtls/platform.h"
 
-#if !defined(MBEDTLS_CAMELLIA_ALT)
-
 static const unsigned char SIGMA_CHARS[6][8] =
 {
     { 0xa0, 0x9e, 0x66, 0x7f, 0x3b, 0xcc, 0x90, 0x8b },
@@ -657,7 +655,6 @@ int mbedtls_camellia_crypt_ctr(mbedtls_camellia_context *ctx,
     return 0;
 }
 #endif /* MBEDTLS_CIPHER_MODE_CTR */
-#endif /* !MBEDTLS_CAMELLIA_ALT */
 
 #if defined(MBEDTLS_SELF_TEST)
 
diff --git a/tf-psa-crypto/drivers/builtin/src/ccm.c b/tf-psa-crypto/drivers/builtin/src/ccm.c
index 45ed697dd3..2503e9f6ac 100644
--- a/tf-psa-crypto/drivers/builtin/src/ccm.c
+++ b/tf-psa-crypto/drivers/builtin/src/ccm.c
@@ -38,9 +38,6 @@
 #endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
 #endif /* MBEDTLS_PLATFORM_C */
 
-#if !defined(MBEDTLS_CCM_ALT)
-
-
 /*
  * Initialize context
  */
@@ -626,7 +623,6 @@ int mbedtls_ccm_auth_decrypt(mbedtls_ccm_context *ctx, size_t length,
                             iv, iv_len, add, add_len,
                             input, output, tag, tag_len);
 }
-#endif /* !MBEDTLS_CCM_ALT */
 
 #if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_CCM_GCM_CAN_AES)
 /*
diff --git a/tf-psa-crypto/drivers/builtin/src/des.c b/tf-psa-crypto/drivers/builtin/src/des.c
index f0032b3b56..5410bd39be 100644
--- a/tf-psa-crypto/drivers/builtin/src/des.c
+++ b/tf-psa-crypto/drivers/builtin/src/des.c
@@ -23,8 +23,6 @@
 
 #include "mbedtls/platform.h"
 
-#if !defined(MBEDTLS_DES_ALT)
-
 /*
  * Expanded DES S-boxes
  */
@@ -773,8 +771,6 @@ exit:
 }
 #endif /* MBEDTLS_CIPHER_MODE_CBC */
 
-#endif /* !MBEDTLS_DES_ALT */
-
 #if defined(MBEDTLS_SELF_TEST)
 /*
  * DES and 3DES test vectors from:
diff --git a/tf-psa-crypto/drivers/builtin/src/gcm.c b/tf-psa-crypto/drivers/builtin/src/gcm.c
index 5dfac2349c..dda1ff21f5 100644
--- a/tf-psa-crypto/drivers/builtin/src/gcm.c
+++ b/tf-psa-crypto/drivers/builtin/src/gcm.c
@@ -39,8 +39,6 @@
 #include "aesce.h"
 #endif
 
-#if !defined(MBEDTLS_GCM_ALT)
-
 /* Used to select the acceleration mechanism */
 #define MBEDTLS_GCM_ACC_SMALLTABLE  0
 #define MBEDTLS_GCM_ACC_LARGETABLE  1
@@ -780,8 +778,6 @@ void mbedtls_gcm_free(mbedtls_gcm_context *ctx)
     mbedtls_platform_zeroize(ctx, sizeof(mbedtls_gcm_context));
 }
 
-#endif /* !MBEDTLS_GCM_ALT */
-
 #if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_CCM_GCM_CAN_AES)
 /*
  * AES-GCM test vectors from:
@@ -1024,9 +1020,6 @@ int mbedtls_gcm_self_test(int verbose)
     size_t olen;
 
     if (verbose != 0) {
-#if defined(MBEDTLS_GCM_ALT)
-        mbedtls_printf("  GCM note: alternative implementation.\n");
-#else /* MBEDTLS_GCM_ALT */
 #if defined(MBEDTLS_AESNI_HAVE_CODE)
         if (mbedtls_aesni_has_support(MBEDTLS_AESNI_CLMUL)) {
             mbedtls_printf("  GCM note: using AESNI.\n");
@@ -1040,7 +1033,6 @@ int mbedtls_gcm_self_test(int verbose)
 #endif
 
         mbedtls_printf("  GCM note: built-in implementation.\n");
-#endif /* MBEDTLS_GCM_ALT */
     }
 
     static const int loop_limit =
@@ -1062,8 +1054,8 @@ int mbedtls_gcm_self_test(int verbose)
                                      key_len);
             /*
              * AES-192 is an optional feature that may be unavailable when
-             * there is an alternative underlying implementation i.e. when
-             * MBEDTLS_AES_ALT is defined.
+             * there is an alternative underlying implementation such as a
+             * PSA driver.
              */
             if (ret == MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED && key_len == 192) {
                 mbedtls_printf("skipped\n");
@@ -1080,14 +1072,6 @@ int mbedtls_gcm_self_test(int verbose)
                                             add_len_test_data[i],
                                             pt_test_data[pt_index_test_data[i]],
                                             buf, 16, tag_buf);
-#if defined(MBEDTLS_GCM_ALT)
-            /* Allow alternative implementations to only support 12-byte nonces. */
-            if (ret == MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED &&
-                iv_len_test_data[i] != 12) {
-                mbedtls_printf("skipped\n");
-                break;
-            }
-#endif /* defined(MBEDTLS_GCM_ALT) */
             if (ret != 0) {
                 goto exit;
             }
diff --git a/tf-psa-crypto/drivers/builtin/src/nist_kw.c b/tf-psa-crypto/drivers/builtin/src/nist_kw.c
index 8faafe43f1..a4b4be759d 100644
--- a/tf-psa-crypto/drivers/builtin/src/nist_kw.c
+++ b/tf-psa-crypto/drivers/builtin/src/nist_kw.c
@@ -30,8 +30,6 @@
 
 #include "mbedtls/platform.h"
 
-#if !defined(MBEDTLS_NIST_KW_ALT)
-
 #define KW_SEMIBLOCK_LENGTH    8
 #define MIN_SEMIBLOCKS_COUNT   3
 
@@ -449,8 +447,6 @@ cleanup:
     return ret;
 }
 
-#endif /* !MBEDTLS_NIST_KW_ALT */
-
 #if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
 
 /*