include/mbedtls/config_adjust_legacy_crypto.h

/**
 * \file mbedtls/config_adjust_legacy_crypto.h
 * \brief Adjust legacy configuration configuration
 *
 * Automatically enable certain dependencies. Generally, MBEDLTS_xxx
 * configurations need to be explicitly enabled by the user: enabling
 * MBEDTLS_xxx_A but not MBEDTLS_xxx_B when A requires B results in a
 * compilation error. However, we do automatically enable certain options
 * in some circumstances. One case is if MBEDTLS_xxx_B is an internal option
 * used to identify parts of a module that are used by other module, and we
 * don't want to make the symbol MBEDTLS_xxx_B part of the public API.
 * Another case is if A didn't depend on B in earlier versions, and we
 * want to use B in A but we need to preserve backward compatibility with
 * configurations that explicitly activate MBEDTLS_xxx_A but not
 * MBEDTLS_xxx_B.
 */
/*
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 */

#ifndef MBEDTLS_CONFIG_ADJUST_LEGACY_CRYPTO_H
#define MBEDTLS_CONFIG_ADJUST_LEGACY_CRYPTO_H

/* Auto-enable MBEDTLS_MD_LIGHT based on MBEDTLS_MD_C.
 * This allows checking for MD_LIGHT rather than MD_LIGHT || MD_C.
 */
#if defined(MBEDTLS_MD_C)
#define MBEDTLS_MD_LIGHT
#endif

/* Auto-enable MBEDTLS_MD_LIGHT if needed by a module that didn't require it
 * in a previous release, to ensure backwards compatibility.
 */
#if defined(MBEDTLS_ECJPAKE_C) || \
    defined(MBEDTLS_PEM_PARSE_C) || \
    defined(MBEDTLS_ENTROPY_C) || \
    defined(MBEDTLS_PK_C) || \
    defined(MBEDTLS_PKCS12_C) || \
    defined(MBEDTLS_RSA_C) || \
    defined(MBEDTLS_SSL_TLS_C) || \
    defined(MBEDTLS_X509_USE_C) || \
    defined(MBEDTLS_X509_CREATE_C)
#define MBEDTLS_MD_LIGHT
#endif

#if defined(MBEDTLS_MD_LIGHT)
/*
 * - MBEDTLS_MD_CAN_xxx is defined if the md module can perform xxx.
 * - MBEDTLS_MD_xxx_VIA_PSA is defined if the md module may perform xxx via PSA
 *   (see below).
 * - MBEDTLS_MD_SOME_PSA is defined if at least one algorithm may be performed
 *   via PSA (see below).
 * - MBEDTLS_MD_SOME_LEGACY is defined if at least one algorithm may be performed
 *   via a direct legacy call (see below).
 *
 * The md module performs an algorithm via PSA if there is a PSA hash
 * accelerator and the PSA driver subsytem is initialized at the time the
 * operation is started, and makes a direct legacy call otherwise.
 */

/* PSA accelerated implementations */
#if defined(MBEDTLS_PSA_CRYPTO_C)

#if defined(MBEDTLS_PSA_ACCEL_ALG_MD5)
#define MBEDTLS_MD_CAN_MD5
#define MBEDTLS_MD_MD5_VIA_PSA
#define MBEDTLS_MD_SOME_PSA
#endif
#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA_1)
#define MBEDTLS_MD_CAN_SHA1
#define MBEDTLS_MD_SHA1_VIA_PSA
#define MBEDTLS_MD_SOME_PSA
#endif
#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA_224)
#define MBEDTLS_MD_CAN_SHA224
#define MBEDTLS_MD_SHA224_VIA_PSA
#define MBEDTLS_MD_SOME_PSA
#endif
#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA_256)
#define MBEDTLS_MD_CAN_SHA256
#define MBEDTLS_MD_SHA256_VIA_PSA
#define MBEDTLS_MD_SOME_PSA
#endif
#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA_384)
#define MBEDTLS_MD_CAN_SHA384
#define MBEDTLS_MD_SHA384_VIA_PSA
#define MBEDTLS_MD_SOME_PSA
#endif
#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA_512)
#define MBEDTLS_MD_CAN_SHA512
#define MBEDTLS_MD_SHA512_VIA_PSA
#define MBEDTLS_MD_SOME_PSA
#endif
#if defined(MBEDTLS_PSA_ACCEL_ALG_RIPEMD160)
#define MBEDTLS_MD_CAN_RIPEMD160
#define MBEDTLS_MD_RIPEMD160_VIA_PSA
#define MBEDTLS_MD_SOME_PSA
#endif
#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA3_224)
#define MBEDTLS_MD_CAN_SHA3_224
#define MBEDTLS_MD_SHA3_224_VIA_PSA
#define MBEDTLS_MD_SOME_PSA
#endif
#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA3_256)
#define MBEDTLS_MD_CAN_SHA3_256
#define MBEDTLS_MD_SHA3_256_VIA_PSA
#define MBEDTLS_MD_SOME_PSA
#endif
#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA3_384)
#define MBEDTLS_MD_CAN_SHA3_384
#define MBEDTLS_MD_SHA3_384_VIA_PSA
#define MBEDTLS_MD_SOME_PSA
#endif
#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA3_512)
#define MBEDTLS_MD_CAN_SHA3_512
#define MBEDTLS_MD_SHA3_512_VIA_PSA
#define MBEDTLS_MD_SOME_PSA
#endif
#endif /* MBEDTLS_PSA_CRYPTO_C */

/* Built-in implementations */
#if defined(MBEDTLS_MD5_C)
#define MBEDTLS_MD_CAN_MD5
#define MBEDTLS_MD_SOME_LEGACY
#endif
#if defined(MBEDTLS_SHA1_C)
#define MBEDTLS_MD_CAN_SHA1
#define MBEDTLS_MD_SOME_LEGACY
#endif
#if defined(MBEDTLS_SHA224_C)
#define MBEDTLS_MD_CAN_SHA224
#define MBEDTLS_MD_SOME_LEGACY
#endif
#if defined(MBEDTLS_SHA256_C)
#define MBEDTLS_MD_CAN_SHA256
#define MBEDTLS_MD_SOME_LEGACY
#endif
#if defined(MBEDTLS_SHA384_C)
#define MBEDTLS_MD_CAN_SHA384
#define MBEDTLS_MD_SOME_LEGACY
#endif
#if defined(MBEDTLS_SHA512_C)
#define MBEDTLS_MD_CAN_SHA512
#define MBEDTLS_MD_SOME_LEGACY
#endif
#if defined(MBEDTLS_SHA3_C)
#define MBEDTLS_MD_CAN_SHA3_224
#define MBEDTLS_MD_CAN_SHA3_256
#define MBEDTLS_MD_CAN_SHA3_384
#define MBEDTLS_MD_CAN_SHA3_512
#define MBEDTLS_MD_SOME_LEGACY
#endif
#if defined(MBEDTLS_RIPEMD160_C)
#define MBEDTLS_MD_CAN_RIPEMD160
#define MBEDTLS_MD_SOME_LEGACY
#endif

#endif /* MBEDTLS_MD_LIGHT */

/* BLOCK_CIPHER module can dispatch to PSA when:
 * - PSA is enabled and drivers have been initialized
 * - desired key type is supported on the PSA side
 * If the above conditions are not met, but the legacy support is enabled, then
 * BLOCK_CIPHER will dynamically fallback to it.
 *
 * In case BLOCK_CIPHER is defined (see below) the following symbols/helpers
 * can be used to define its capabilities:
 * - MBEDTLS_BLOCK_CIPHER_SOME_PSA: there is at least 1 key type between AES,
 *   ARIA and Camellia which is supported through a driver;
 * - MBEDTLS_BLOCK_CIPHER_xxx_VIA_PSA: xxx key type is supported through a
 *   driver;
 * - MBEDTLS_BLOCK_CIPHER_xxx_VIA_LEGACY: xxx key type is supported through
 *   a legacy module (i.e. MBEDTLS_xxx_C)
 */
#if defined(MBEDTLS_PSA_CRYPTO_C)
#if defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_AES)
#define MBEDTLS_BLOCK_CIPHER_AES_VIA_PSA
#define MBEDTLS_BLOCK_CIPHER_SOME_PSA
#endif
#if defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_ARIA)
#define MBEDTLS_BLOCK_CIPHER_ARIA_VIA_PSA
#define MBEDTLS_BLOCK_CIPHER_SOME_PSA
#endif
#if defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_CAMELLIA)
#define MBEDTLS_BLOCK_CIPHER_CAMELLIA_VIA_PSA
#define MBEDTLS_BLOCK_CIPHER_SOME_PSA
#endif
#endif /* MBEDTLS_PSA_CRYPTO_C */

#if defined(MBEDTLS_AES_C)
#define MBEDTLS_BLOCK_CIPHER_AES_VIA_LEGACY
#endif
#if defined(MBEDTLS_ARIA_C)
#define MBEDTLS_BLOCK_CIPHER_ARIA_VIA_LEGACY
#endif
#if defined(MBEDTLS_CAMELLIA_C)
#define MBEDTLS_BLOCK_CIPHER_CAMELLIA_VIA_LEGACY
#endif

/* Helpers to state that BLOCK_CIPHER module supports AES, ARIA and/or Camellia
 * block ciphers via either PSA or legacy. */
#if defined(MBEDTLS_BLOCK_CIPHER_AES_VIA_PSA) || \
    defined(MBEDTLS_BLOCK_CIPHER_AES_VIA_LEGACY)
#define MBEDTLS_BLOCK_CIPHER_CAN_AES
#endif
#if defined(MBEDTLS_BLOCK_CIPHER_ARIA_VIA_PSA) || \
    defined(MBEDTLS_BLOCK_CIPHER_ARIA_VIA_LEGACY)
#define MBEDTLS_BLOCK_CIPHER_CAN_ARIA
#endif
#if defined(MBEDTLS_BLOCK_CIPHER_CAMELLIA_VIA_PSA) || \
    defined(MBEDTLS_BLOCK_CIPHER_CAMELLIA_VIA_LEGACY)
#define MBEDTLS_BLOCK_CIPHER_CAN_CAMELLIA
#endif

/* GCM_C and CCM_C can either depend on (in order of preference) BLOCK_CIPHER_C
 * or CIPHER_C. The former is auto-enabled when:
 * - CIPHER_C is not defined, which is also the legacy solution;
 * - BLOCK_CIPHER_SOME_PSA because in this case BLOCK_CIPHER can take advantage
 *   of the driver's acceleration.
 */
#if (defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C)) && \
    (!defined(MBEDTLS_CIPHER_C) || defined(MBEDTLS_BLOCK_CIPHER_SOME_PSA))
#define MBEDTLS_BLOCK_CIPHER_C
#endif

/* MBEDTLS_ECP_LIGHT is auto-enabled by the following symbols:
 * - MBEDTLS_ECP_C because now it consists of MBEDTLS_ECP_LIGHT plus functions
 *   for curve arithmetic. As a consequence if MBEDTLS_ECP_C is required for
 *   some reason, then MBEDTLS_ECP_LIGHT should be enabled as well.
 * - MBEDTLS_PK_PARSE_EC_EXTENDED and MBEDTLS_PK_PARSE_EC_COMPRESSED because
 *   these features are not supported in PSA so the only way to have them is
 *   to enable the built-in solution.
 *   Both of them are temporary dependencies:
 *   - PK_PARSE_EC_EXTENDED will be removed after #7779 and #7789
 *   - support for compressed points should also be added to PSA, but in this
 *     case there is no associated issue to track it yet.
 * - PSA_WANT_KEY_TYPE_ECC_KEY_PAIR_DERIVE because Weierstrass key derivation
 *   still depends on ECP_LIGHT.
 * - PK_C + USE_PSA + PSA_WANT_ALG_ECDSA is a temporary dependency which will
 *   be fixed by #7453.
 */
#if defined(MBEDTLS_ECP_C) || \
    defined(MBEDTLS_PK_PARSE_EC_EXTENDED) || \
    defined(MBEDTLS_PK_PARSE_EC_COMPRESSED) || \
    defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR_DERIVE)
#define MBEDTLS_ECP_LIGHT
#endif

/* MBEDTLS_PK_PARSE_EC_COMPRESSED is introduced in Mbed TLS version 3.5, while
 * in previous version compressed points were automatically supported as long
 * as PK_PARSE_C and ECP_C were enabled. As a consequence, for backward
 * compatibility, we auto-enable PK_PARSE_EC_COMPRESSED when these conditions
 * are met. */
#if defined(MBEDTLS_PK_PARSE_C) && defined(MBEDTLS_ECP_C)
#define MBEDTLS_PK_PARSE_EC_COMPRESSED
#endif

/* Helper symbol to state that there is support for ECDH, either through
 * library implementation (ECDH_C) or through PSA. */
#if (defined(MBEDTLS_USE_PSA_CRYPTO) && defined(PSA_WANT_ALG_ECDH)) || \
    (!defined(MBEDTLS_USE_PSA_CRYPTO) && defined(MBEDTLS_ECDH_C))
#define MBEDTLS_CAN_ECDH
#endif

/* PK module can achieve ECDSA functionalities by means of either software
 * implementations (ECDSA_C) or through a PSA driver. The following defines
 * are meant to list these capabilities in a general way which abstracts how
 * they are implemented under the hood. */
#if !defined(MBEDTLS_USE_PSA_CRYPTO)
#if defined(MBEDTLS_ECDSA_C)
#define MBEDTLS_PK_CAN_ECDSA_SIGN
#define MBEDTLS_PK_CAN_ECDSA_VERIFY
#endif /* MBEDTLS_ECDSA_C */
#else /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(PSA_WANT_ALG_ECDSA)
#if defined(PSA_WANT_KEY_TYPE_ECC_KEY_PAIR_BASIC)
#define MBEDTLS_PK_CAN_ECDSA_SIGN
#endif /* PSA_WANT_KEY_TYPE_ECC_KEY_PAIR_BASIC */
#if defined(PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY)
#define MBEDTLS_PK_CAN_ECDSA_VERIFY
#endif /* PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY */
#endif /* PSA_WANT_ALG_ECDSA */
#endif /* MBEDTLS_USE_PSA_CRYPTO */

#if defined(MBEDTLS_PK_CAN_ECDSA_VERIFY) || defined(MBEDTLS_PK_CAN_ECDSA_SIGN)
#define MBEDTLS_PK_CAN_ECDSA_SOME
#endif

/* If MBEDTLS_PSA_CRYPTO_C is defined, make sure MBEDTLS_PSA_CRYPTO_CLIENT
 * is defined as well to include all PSA code.
 */
#if defined(MBEDTLS_PSA_CRYPTO_C)
#define MBEDTLS_PSA_CRYPTO_CLIENT
#endif /* MBEDTLS_PSA_CRYPTO_C */

/* The PK wrappers need pk_write functions to format RSA key objects
 * when they are dispatching to the PSA API. This happens under USE_PSA_CRYPTO,
 * and also even without USE_PSA_CRYPTO for mbedtls_pk_sign_ext(). */
#if defined(MBEDTLS_PSA_CRYPTO_C) && defined(MBEDTLS_RSA_C)
#define MBEDTLS_PK_C
#define MBEDTLS_PK_WRITE_C
#define MBEDTLS_PK_PARSE_C
#endif

/* Helpers to state that each key is supported either on the builtin or PSA side. */
#if defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED) || defined(PSA_WANT_ECC_SECP_R1_521)
#define MBEDTLS_ECP_HAVE_SECP521R1
#endif
#if defined(MBEDTLS_ECP_DP_BP512R1_ENABLED) || defined(PSA_WANT_ECC_BRAINPOOL_P_R1_512)
#define MBEDTLS_ECP_HAVE_BP512R1
#endif
#if defined(MBEDTLS_ECP_DP_CURVE448_ENABLED) || defined(PSA_WANT_ECC_MONTGOMERY_448)
#define MBEDTLS_ECP_HAVE_CURVE448
#endif
#if defined(MBEDTLS_ECP_DP_BP384R1_ENABLED) || defined(PSA_WANT_ECC_BRAINPOOL_P_R1_384)
#define MBEDTLS_ECP_HAVE_BP384R1
#endif
#if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED) || defined(PSA_WANT_ECC_SECP_R1_384)
#define MBEDTLS_ECP_HAVE_SECP384R1
#endif
#if defined(MBEDTLS_ECP_DP_BP256R1_ENABLED) || defined(PSA_WANT_ECC_BRAINPOOL_P_R1_256)
#define MBEDTLS_ECP_HAVE_BP256R1
#endif
#if defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED) || defined(PSA_WANT_ECC_SECP_K1_256)
#define MBEDTLS_ECP_HAVE_SECP256K1
#endif
#if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) || defined(PSA_WANT_ECC_SECP_R1_256)
#define MBEDTLS_ECP_HAVE_SECP256R1
#endif
#if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED) || defined(PSA_WANT_ECC_MONTGOMERY_255)
#define MBEDTLS_ECP_HAVE_CURVE25519
#endif
#if defined(MBEDTLS_ECP_DP_SECP224K1_ENABLED) || defined(PSA_WANT_ECC_SECP_K1_224)
#define MBEDTLS_ECP_HAVE_SECP224K1
#endif
#if defined(MBEDTLS_ECP_DP_SECP224R1_ENABLED) || defined(PSA_WANT_ECC_SECP_R1_224)
#define MBEDTLS_ECP_HAVE_SECP224R1
#endif
#if defined(MBEDTLS_ECP_DP_SECP192K1_ENABLED) || defined(PSA_WANT_ECC_SECP_K1_192)
#define MBEDTLS_ECP_HAVE_SECP192K1
#endif
#if defined(MBEDTLS_ECP_DP_SECP192R1_ENABLED) || defined(PSA_WANT_ECC_SECP_R1_192)
#define MBEDTLS_ECP_HAVE_SECP192R1
#endif

/* Helper symbol to state that the PK module has support for EC keys. This
 * can either be provided through the legacy ECP solution or through the
 * PSA friendly MBEDTLS_PK_USE_PSA_EC_DATA (see pk.h for its description). */
#if defined(MBEDTLS_ECP_C) || \
    (defined(MBEDTLS_USE_PSA_CRYPTO) && defined(PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY))
#define MBEDTLS_PK_HAVE_ECC_KEYS
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA || MBEDTLS_ECP_C */

/* Historically pkparse did not check the CBC padding when decrypting
 * a key. This was a bug, which is now fixed. As a consequence, pkparse
 * now needs PKCS7 padding support, but existing configurations might not
 * enable it, so we enable it here. */
#if defined(MBEDTLS_PK_PARSE_C) && defined(MBEDTLS_PKCS5_C) && defined(MBEDTLS_CIPHER_MODE_CBC)
#define MBEDTLS_CIPHER_PADDING_PKCS7
#endif

/* Backwards compatibility for some macros which were renamed to reflect that
 * they are related to Armv8, not aarch64. */
#if defined(MBEDTLS_SHA256_USE_A64_CRYPTO_IF_PRESENT) && \
    !defined(MBEDTLS_SHA256_USE_ARMV8_A_CRYPTO_IF_PRESENT)
#define MBEDTLS_SHA256_USE_ARMV8_A_CRYPTO_IF_PRESENT
#endif
#if defined(MBEDTLS_SHA256_USE_A64_CRYPTO_ONLY) && !defined(MBEDTLS_SHA256_USE_ARMV8_A_CRYPTO_ONLY)
#define MBEDTLS_SHA256_USE_ARMV8_A_CRYPTO_ONLY
#endif

/* Some internal helpers to determine which keys are availble. */
#if (!defined(MBEDTLS_USE_PSA_CRYPTO) && defined(MBEDTLS_AES_C)) || \
    (defined(MBEDTLS_USE_PSA_CRYPTO) && defined(PSA_WANT_KEY_TYPE_AES))
#define MBEDTLS_SSL_HAVE_AES
#endif
#if (!defined(MBEDTLS_USE_PSA_CRYPTO) && defined(MBEDTLS_ARIA_C)) || \
    (defined(MBEDTLS_USE_PSA_CRYPTO) && defined(PSA_WANT_KEY_TYPE_ARIA))
#define MBEDTLS_SSL_HAVE_ARIA
#endif
#if (!defined(MBEDTLS_USE_PSA_CRYPTO) && defined(MBEDTLS_CAMELLIA_C)) || \
    (defined(MBEDTLS_USE_PSA_CRYPTO) && defined(PSA_WANT_KEY_TYPE_CAMELLIA))
#define MBEDTLS_SSL_HAVE_CAMELLIA
#endif

/* Some internal helpers to determine which operation modes are availble. */
#if (!defined(MBEDTLS_USE_PSA_CRYPTO) && defined(MBEDTLS_CIPHER_MODE_CBC)) || \
    (defined(MBEDTLS_USE_PSA_CRYPTO) && defined(PSA_WANT_ALG_CBC_NO_PADDING))
#define MBEDTLS_SSL_HAVE_CBC
#endif

#if (!defined(MBEDTLS_USE_PSA_CRYPTO) && defined(MBEDTLS_GCM_C)) || \
    (defined(MBEDTLS_USE_PSA_CRYPTO) && defined(PSA_WANT_ALG_GCM))
#define MBEDTLS_SSL_HAVE_GCM
#endif

#if (!defined(MBEDTLS_USE_PSA_CRYPTO) && defined(MBEDTLS_CCM_C)) || \
    (defined(MBEDTLS_USE_PSA_CRYPTO) && defined(PSA_WANT_ALG_CCM))
#define MBEDTLS_SSL_HAVE_CCM
#endif

#if (!defined(MBEDTLS_USE_PSA_CRYPTO) && defined(MBEDTLS_CHACHAPOLY_C)) || \
    (defined(MBEDTLS_USE_PSA_CRYPTO) && defined(PSA_WANT_ALG_CHACHA20_POLY1305))
#define MBEDTLS_SSL_HAVE_CHACHAPOLY
#endif

#if defined(MBEDTLS_SSL_HAVE_GCM) || defined(MBEDTLS_SSL_HAVE_CCM) || \
    defined(MBEDTLS_SSL_HAVE_CHACHAPOLY)
#define MBEDTLS_SSL_HAVE_AEAD
#endif

#endif /* MBEDTLS_CONFIG_ADJUST_LEGACY_CRYPTO_H */