/** * \file psa/crypto_sizes.h * * \brief PSA cryptography module: Mbed TLS buffer size macros * * \note This file may not be included directly. Applications must * include psa/crypto.h. * * This file contains the definitions of macros that are useful to * compute buffer sizes. The signatures and semantics of these macros * are standardized, but the definitions are not, because they depend on * the available algorithms and, in some cases, on permitted tolerances * on buffer sizes. * * In implementations with isolation between the application and the * cryptography module, implementers should take care to ensure that * the definitions that are exposed to applications match what the * module implements. * * Macros that compute sizes whose values do not depend on the * implementation are in crypto.h. */ /* * Copyright The Mbed TLS Contributors * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */ #ifndef PSA_CRYPTO_SIZES_H #define PSA_CRYPTO_SIZES_H /* * Include the build-time configuration information header. Here, we do not * include `"mbedtls/build_info.h"` directly but `"psa/build_info.h"`, which * is basically just an alias to it. This is to ease the maintenance of the * TF-PSA-Crypto repository which has a different build system and * configuration. */ #include "psa/build_info.h" #define PSA_BITS_TO_BYTES(bits) … #define PSA_BYTES_TO_BITS(bytes) … #define PSA_MAX_OF_THREE(a, b, c) … #define PSA_ROUND_UP_TO_MULTIPLE(block_size, length) … /** The size of the output of psa_hash_finish(), in bytes. * * This is also the hash size that psa_hash_verify() expects. * * \param alg A hash algorithm (\c PSA_ALG_XXX value such that * #PSA_ALG_IS_HASH(\p alg) is true), or an HMAC algorithm * (#PSA_ALG_HMAC(\c hash_alg) where \c hash_alg is a * hash algorithm). * * \return The hash size for the specified hash algorithm. * If the hash algorithm is not recognized, return 0. */ #define PSA_HASH_LENGTH(alg) … /** The input block size of a hash algorithm, in bytes. * * Hash algorithms process their input data in blocks. Hash operations will * retain any partial blocks until they have enough input to fill the block or * until the operation is finished. * This affects the output from psa_hash_suspend(). * * \param alg A hash algorithm (\c PSA_ALG_XXX value such that * PSA_ALG_IS_HASH(\p alg) is true). * * \return The block size in bytes for the specified hash algorithm. * If the hash algorithm is not recognized, return 0. * An implementation can return either 0 or the correct size for a * hash algorithm that it recognizes, but does not support. */ #define PSA_HASH_BLOCK_LENGTH(alg) … /** \def PSA_HASH_MAX_SIZE * * Maximum size of a hash. * * This macro expands to a compile-time constant integer. This value * is the maximum size of a hash in bytes. */ /* Note: for HMAC-SHA-3, the block size is 144 bytes for HMAC-SHA3-224, * 136 bytes for HMAC-SHA3-256, 104 bytes for SHA3-384, 72 bytes for * HMAC-SHA3-512. */ /* Note: PSA_HASH_MAX_SIZE should be kept in sync with MBEDTLS_MD_MAX_SIZE, * see the note on MBEDTLS_MD_MAX_SIZE for details. */ #if defined(PSA_WANT_ALG_SHA3_224) #define PSA_HMAC_MAX_HASH_BLOCK_SIZE … #elif defined(PSA_WANT_ALG_SHA3_256) #define PSA_HMAC_MAX_HASH_BLOCK_SIZE … #elif defined(PSA_WANT_ALG_SHA_512) #define PSA_HMAC_MAX_HASH_BLOCK_SIZE … #elif defined(PSA_WANT_ALG_SHA_384) #define PSA_HMAC_MAX_HASH_BLOCK_SIZE … #elif defined(PSA_WANT_ALG_SHA3_384) #define PSA_HMAC_MAX_HASH_BLOCK_SIZE … #elif defined(PSA_WANT_ALG_SHA3_512) #define PSA_HMAC_MAX_HASH_BLOCK_SIZE … #elif defined(PSA_WANT_ALG_SHA_256) #define PSA_HMAC_MAX_HASH_BLOCK_SIZE … #elif defined(PSA_WANT_ALG_SHA_224) #define PSA_HMAC_MAX_HASH_BLOCK_SIZE … #else /* SHA-1 or smaller */ #define PSA_HMAC_MAX_HASH_BLOCK_SIZE … #endif #if defined(PSA_WANT_ALG_SHA_512) || defined(PSA_WANT_ALG_SHA3_512) #define PSA_HASH_MAX_SIZE … #elif defined(PSA_WANT_ALG_SHA_384) || defined(PSA_WANT_ALG_SHA3_384) #define PSA_HASH_MAX_SIZE … #elif defined(PSA_WANT_ALG_SHA_256) || defined(PSA_WANT_ALG_SHA3_256) #define PSA_HASH_MAX_SIZE … #elif defined(PSA_WANT_ALG_SHA_224) || defined(PSA_WANT_ALG_SHA3_224) #define PSA_HASH_MAX_SIZE … #else /* SHA-1 or smaller */ #define PSA_HASH_MAX_SIZE … #endif /** \def PSA_MAC_MAX_SIZE * * Maximum size of a MAC. * * This macro expands to a compile-time constant integer. This value * is the maximum size of a MAC in bytes. */ /* All non-HMAC MACs have a maximum size that's smaller than the * minimum possible value of PSA_HASH_MAX_SIZE in this implementation. */ /* Note that the encoding of truncated MAC algorithms limits this value * to 64 bytes. */ #define PSA_MAC_MAX_SIZE … /** The length of a tag for an AEAD algorithm, in bytes. * * This macro can be used to allocate a buffer of sufficient size to store the * tag output from psa_aead_finish(). * * See also #PSA_AEAD_TAG_MAX_SIZE. * * \param key_type The type of the AEAD key. * \param key_bits The size of the AEAD key in bits. * \param alg An AEAD algorithm * (\c PSA_ALG_XXX value such that * #PSA_ALG_IS_AEAD(\p alg) is true). * * \return The tag length for the specified algorithm and key. * If the AEAD algorithm does not have an identified * tag that can be distinguished from the rest of * the ciphertext, return 0. * If the key type or AEAD algorithm is not * recognized, or the parameters are incompatible, * return 0. */ #define PSA_AEAD_TAG_LENGTH(key_type, key_bits, alg) … /** The maximum tag size for all supported AEAD algorithms, in bytes. * * See also #PSA_AEAD_TAG_LENGTH(\p key_type, \p key_bits, \p alg). */ #define PSA_AEAD_TAG_MAX_SIZE … /* The maximum size of an RSA key on this implementation, in bits. * This is a vendor-specific macro. * * Mbed TLS does not set a hard limit on the size of RSA keys: any key * whose parameters fit in a bignum is accepted. However large keys can * induce a large memory usage and long computation times. Unlike other * auxiliary macros in this file and in crypto.h, which reflect how the * library is configured, this macro defines how the library is * configured. This implementation refuses to import or generate an * RSA key whose size is larger than the value defined here. * * Note that an implementation may set different size limits for different * operations, and does not need to accept all key sizes up to the limit. */ #define PSA_VENDOR_RSA_MAX_KEY_BITS … /* The minimum size of an RSA key on this implementation, in bits. * This is a vendor-specific macro. * * Limits RSA key generation to a minimum due to avoid accidental misuse. * This value cannot be less than 128 bits. */ #if defined(MBEDTLS_RSA_GEN_KEY_MIN_BITS) #define PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS … #else #define PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS … #endif /* The maximum size of an DH key on this implementation, in bits. * This is a vendor-specific macro.*/ #if defined(PSA_WANT_DH_RFC7919_8192) #define PSA_VENDOR_FFDH_MAX_KEY_BITS … #elif defined(PSA_WANT_DH_RFC7919_6144) #define PSA_VENDOR_FFDH_MAX_KEY_BITS … #elif defined(PSA_WANT_DH_RFC7919_4096) #define PSA_VENDOR_FFDH_MAX_KEY_BITS … #elif defined(PSA_WANT_DH_RFC7919_3072) #define PSA_VENDOR_FFDH_MAX_KEY_BITS … #elif defined(PSA_WANT_DH_RFC7919_2048) #define PSA_VENDOR_FFDH_MAX_KEY_BITS … #else #define PSA_VENDOR_FFDH_MAX_KEY_BITS … #endif /* The maximum size of an ECC key on this implementation, in bits. * This is a vendor-specific macro. */ #if defined(PSA_WANT_ECC_SECP_R1_521) #define PSA_VENDOR_ECC_MAX_CURVE_BITS … #elif defined(PSA_WANT_ECC_BRAINPOOL_P_R1_512) #define PSA_VENDOR_ECC_MAX_CURVE_BITS … #elif defined(PSA_WANT_ECC_MONTGOMERY_448) #define PSA_VENDOR_ECC_MAX_CURVE_BITS … #elif defined(PSA_WANT_ECC_SECP_R1_384) #define PSA_VENDOR_ECC_MAX_CURVE_BITS … #elif defined(PSA_WANT_ECC_BRAINPOOL_P_R1_384) #define PSA_VENDOR_ECC_MAX_CURVE_BITS … #elif defined(PSA_WANT_ECC_SECP_R1_256) #define PSA_VENDOR_ECC_MAX_CURVE_BITS … #elif defined(PSA_WANT_ECC_SECP_K1_256) #define PSA_VENDOR_ECC_MAX_CURVE_BITS … #elif defined(PSA_WANT_ECC_BRAINPOOL_P_R1_256) #define PSA_VENDOR_ECC_MAX_CURVE_BITS … #elif defined(PSA_WANT_ECC_MONTGOMERY_255) #define PSA_VENDOR_ECC_MAX_CURVE_BITS … #elif defined(PSA_WANT_ECC_SECP_R1_224) #define PSA_VENDOR_ECC_MAX_CURVE_BITS … #elif defined(PSA_WANT_ECC_SECP_K1_224) #define PSA_VENDOR_ECC_MAX_CURVE_BITS … #elif defined(PSA_WANT_ECC_SECP_R1_192) #define PSA_VENDOR_ECC_MAX_CURVE_BITS … #elif defined(PSA_WANT_ECC_SECP_K1_192) #define PSA_VENDOR_ECC_MAX_CURVE_BITS … #else #define PSA_VENDOR_ECC_MAX_CURVE_BITS … #endif /** This macro returns the maximum supported length of the PSK for the * TLS-1.2 PSK-to-MS key derivation * (#PSA_ALG_TLS12_PSK_TO_MS(\c hash_alg)). * * The maximum supported length does not depend on the chosen hash algorithm. * * Quoting RFC 4279, Sect 5.3: * TLS implementations supporting these ciphersuites MUST support * arbitrary PSK identities up to 128 octets in length, and arbitrary * PSKs up to 64 octets in length. Supporting longer identities and * keys is RECOMMENDED. * * Therefore, no implementation should define a value smaller than 64 * for #PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE. */ #define PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE … /* The expected size of input passed to psa_tls12_ecjpake_to_pms_input, * which is expected to work with P-256 curve only. */ #define PSA_TLS12_ECJPAKE_TO_PMS_INPUT_SIZE … /* The size of a serialized K.X coordinate to be used in * psa_tls12_ecjpake_to_pms_input. This function only accepts the P-256 * curve. */ #define PSA_TLS12_ECJPAKE_TO_PMS_DATA_SIZE … /* The maximum number of iterations for PBKDF2 on this implementation, in bits. * This is a vendor-specific macro. This can be configured if necessary */ #define PSA_VENDOR_PBKDF2_MAX_ITERATIONS … /** The maximum size of a block cipher. */ #define PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE … /** The size of the output of psa_mac_sign_finish(), in bytes. * * This is also the MAC size that psa_mac_verify_finish() expects. * * \warning This macro may evaluate its arguments multiple times or * zero times, so you should not pass arguments that contain * side effects. * * \param key_type The type of the MAC key. * \param key_bits The size of the MAC key in bits. * \param alg A MAC algorithm (\c PSA_ALG_XXX value such that * #PSA_ALG_IS_MAC(\p alg) is true). * * \return The MAC size for the specified algorithm with * the specified key parameters. * \return 0 if the MAC algorithm is not recognized. * \return Either 0 or the correct size for a MAC algorithm that * the implementation recognizes, but does not support. * \return Unspecified if the key parameters are not consistent * with the algorithm. */ #define PSA_MAC_LENGTH(key_type, key_bits, alg) … /** The maximum size of the output of psa_aead_encrypt(), in bytes. * * If the size of the ciphertext buffer is at least this large, it is * guaranteed that psa_aead_encrypt() will not fail due to an * insufficient buffer size. Depending on the algorithm, the actual size of * the ciphertext may be smaller. * * See also #PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE(\p plaintext_length). * * \warning This macro may evaluate its arguments multiple times or * zero times, so you should not pass arguments that contain * side effects. * * \param key_type A symmetric key type that is * compatible with algorithm \p alg. * \param alg An AEAD algorithm * (\c PSA_ALG_XXX value such that * #PSA_ALG_IS_AEAD(\p alg) is true). * \param plaintext_length Size of the plaintext in bytes. * * \return The AEAD ciphertext size for the specified * algorithm. * If the key type or AEAD algorithm is not * recognized, or the parameters are incompatible, * return 0. */ #define PSA_AEAD_ENCRYPT_OUTPUT_SIZE(key_type, alg, plaintext_length) … /** A sufficient output buffer size for psa_aead_encrypt(), for any of the * supported key types and AEAD algorithms. * * If the size of the ciphertext buffer is at least this large, it is guaranteed * that psa_aead_encrypt() will not fail due to an insufficient buffer size. * * \note This macro returns a compile-time constant if its arguments are * compile-time constants. * * See also #PSA_AEAD_ENCRYPT_OUTPUT_SIZE(\p key_type, \p alg, * \p plaintext_length). * * \param plaintext_length Size of the plaintext in bytes. * * \return A sufficient output buffer size for any of the * supported key types and AEAD algorithms. * */ #define PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE(plaintext_length) … /** The maximum size of the output of psa_aead_decrypt(), in bytes. * * If the size of the plaintext buffer is at least this large, it is * guaranteed that psa_aead_decrypt() will not fail due to an * insufficient buffer size. Depending on the algorithm, the actual size of * the plaintext may be smaller. * * See also #PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE(\p ciphertext_length). * * \warning This macro may evaluate its arguments multiple times or * zero times, so you should not pass arguments that contain * side effects. * * \param key_type A symmetric key type that is * compatible with algorithm \p alg. * \param alg An AEAD algorithm * (\c PSA_ALG_XXX value such that * #PSA_ALG_IS_AEAD(\p alg) is true). * \param ciphertext_length Size of the plaintext in bytes. * * \return The AEAD ciphertext size for the specified * algorithm. * If the key type or AEAD algorithm is not * recognized, or the parameters are incompatible, * return 0. */ #define PSA_AEAD_DECRYPT_OUTPUT_SIZE(key_type, alg, ciphertext_length) … /** A sufficient output buffer size for psa_aead_decrypt(), for any of the * supported key types and AEAD algorithms. * * If the size of the plaintext buffer is at least this large, it is guaranteed * that psa_aead_decrypt() will not fail due to an insufficient buffer size. * * \note This macro returns a compile-time constant if its arguments are * compile-time constants. * * See also #PSA_AEAD_DECRYPT_OUTPUT_SIZE(\p key_type, \p alg, * \p ciphertext_length). * * \param ciphertext_length Size of the ciphertext in bytes. * * \return A sufficient output buffer size for any of the * supported key types and AEAD algorithms. * */ #define PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE(ciphertext_length) … /** The default nonce size for an AEAD algorithm, in bytes. * * This macro can be used to allocate a buffer of sufficient size to * store the nonce output from #psa_aead_generate_nonce(). * * See also #PSA_AEAD_NONCE_MAX_SIZE. * * \note This is not the maximum size of nonce supported as input to * #psa_aead_set_nonce(), #psa_aead_encrypt() or #psa_aead_decrypt(), * just the default size that is generated by #psa_aead_generate_nonce(). * * \warning This macro may evaluate its arguments multiple times or * zero times, so you should not pass arguments that contain * side effects. * * \param key_type A symmetric key type that is compatible with * algorithm \p alg. * * \param alg An AEAD algorithm (\c PSA_ALG_XXX value such that * #PSA_ALG_IS_AEAD(\p alg) is true). * * \return The default nonce size for the specified key type and algorithm. * If the key type or AEAD algorithm is not recognized, * or the parameters are incompatible, return 0. */ #define PSA_AEAD_NONCE_LENGTH(key_type, alg) … /** The maximum default nonce size among all supported pairs of key types and * AEAD algorithms, in bytes. * * This is equal to or greater than any value that #PSA_AEAD_NONCE_LENGTH() * may return. * * \note This is not the maximum size of nonce supported as input to * #psa_aead_set_nonce(), #psa_aead_encrypt() or #psa_aead_decrypt(), * just the largest size that may be generated by * #psa_aead_generate_nonce(). */ #define PSA_AEAD_NONCE_MAX_SIZE … /** A sufficient output buffer size for psa_aead_update(). * * If the size of the output buffer is at least this large, it is * guaranteed that psa_aead_update() will not fail due to an * insufficient buffer size. The actual size of the output may be smaller * in any given call. * * See also #PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE(\p input_length). * * \warning This macro may evaluate its arguments multiple times or * zero times, so you should not pass arguments that contain * side effects. * * \param key_type A symmetric key type that is * compatible with algorithm \p alg. * \param alg An AEAD algorithm * (\c PSA_ALG_XXX value such that * #PSA_ALG_IS_AEAD(\p alg) is true). * \param input_length Size of the input in bytes. * * \return A sufficient output buffer size for the specified * algorithm. * If the key type or AEAD algorithm is not * recognized, or the parameters are incompatible, * return 0. */ /* For all the AEAD modes defined in this specification, it is possible * to emit output without delay. However, hardware may not always be * capable of this. So for modes based on a block cipher, allow the * implementation to delay the output until it has a full block. */ #define PSA_AEAD_UPDATE_OUTPUT_SIZE(key_type, alg, input_length) … /** A sufficient output buffer size for psa_aead_update(), for any of the * supported key types and AEAD algorithms. * * If the size of the output buffer is at least this large, it is guaranteed * that psa_aead_update() will not fail due to an insufficient buffer size. * * See also #PSA_AEAD_UPDATE_OUTPUT_SIZE(\p key_type, \p alg, \p input_length). * * \param input_length Size of the input in bytes. */ #define PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE(input_length) … /** A sufficient ciphertext buffer size for psa_aead_finish(). * * If the size of the ciphertext buffer is at least this large, it is * guaranteed that psa_aead_finish() will not fail due to an * insufficient ciphertext buffer size. The actual size of the output may * be smaller in any given call. * * See also #PSA_AEAD_FINISH_OUTPUT_MAX_SIZE. * * \param key_type A symmetric key type that is compatible with algorithm \p alg. * \param alg An AEAD algorithm * (\c PSA_ALG_XXX value such that * #PSA_ALG_IS_AEAD(\p alg) is true). * * \return A sufficient ciphertext buffer size for the * specified algorithm. * If the key type or AEAD algorithm is not * recognized, or the parameters are incompatible, * return 0. */ #define PSA_AEAD_FINISH_OUTPUT_SIZE(key_type, alg) … /** A sufficient ciphertext buffer size for psa_aead_finish(), for any of the * supported key types and AEAD algorithms. * * See also #PSA_AEAD_FINISH_OUTPUT_SIZE(\p key_type, \p alg). */ #define PSA_AEAD_FINISH_OUTPUT_MAX_SIZE … /** A sufficient plaintext buffer size for psa_aead_verify(). * * If the size of the plaintext buffer is at least this large, it is * guaranteed that psa_aead_verify() will not fail due to an * insufficient plaintext buffer size. The actual size of the output may * be smaller in any given call. * * See also #PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE. * * \param key_type A symmetric key type that is * compatible with algorithm \p alg. * \param alg An AEAD algorithm * (\c PSA_ALG_XXX value such that * #PSA_ALG_IS_AEAD(\p alg) is true). * * \return A sufficient plaintext buffer size for the * specified algorithm. * If the key type or AEAD algorithm is not * recognized, or the parameters are incompatible, * return 0. */ #define PSA_AEAD_VERIFY_OUTPUT_SIZE(key_type, alg) … /** A sufficient plaintext buffer size for psa_aead_verify(), for any of the * supported key types and AEAD algorithms. * * See also #PSA_AEAD_VERIFY_OUTPUT_SIZE(\p key_type, \p alg). */ #define PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE … #define PSA_RSA_MINIMUM_PADDING_SIZE(alg) … /** * \brief ECDSA signature size for a given curve bit size * * \param curve_bits Curve size in bits. * \return Signature size in bytes. * * \note This macro returns a compile-time constant if its argument is one. */ #define PSA_ECDSA_SIGNATURE_SIZE(curve_bits) … /** Sufficient signature buffer size for psa_sign_hash(). * * This macro returns a sufficient buffer size for a signature using a key * of the specified type and size, with the specified algorithm. * Note that the actual size of the signature may be smaller * (some algorithms produce a variable-size signature). * * \warning This function may call its arguments multiple times or * zero times, so you should not pass arguments that contain * side effects. * * \param key_type An asymmetric key type (this may indifferently be a * key pair type or a public key type). * \param key_bits The size of the key in bits. * \param alg The signature algorithm. * * \return If the parameters are valid and supported, return * a buffer size in bytes that guarantees that * psa_sign_hash() will not fail with * #PSA_ERROR_BUFFER_TOO_SMALL. * If the parameters are a valid combination that is not supported, * return either a sensible size or 0. * If the parameters are not valid, the * return value is unspecified. */ #define PSA_SIGN_OUTPUT_SIZE(key_type, key_bits, alg) … #define PSA_VENDOR_ECDSA_SIGNATURE_MAX_SIZE … /** \def PSA_SIGNATURE_MAX_SIZE * * Maximum size of an asymmetric signature. * * This macro expands to a compile-time constant integer. This value * is the maximum size of a signature in bytes. */ #define PSA_SIGNATURE_MAX_SIZE … #if (defined(PSA_WANT_ALG_ECDSA) || defined(PSA_WANT_ALG_DETERMINISTIC_ECDSA)) && \ (PSA_VENDOR_ECDSA_SIGNATURE_MAX_SIZE > PSA_SIGNATURE_MAX_SIZE) #undef PSA_SIGNATURE_MAX_SIZE #define PSA_SIGNATURE_MAX_SIZE … #endif #if (defined(PSA_WANT_ALG_RSA_PKCS1V15_SIGN) || defined(PSA_WANT_ALG_RSA_PSS)) && \ (PSA_BITS_TO_BYTES(PSA_VENDOR_RSA_MAX_KEY_BITS) > PSA_SIGNATURE_MAX_SIZE) #undef PSA_SIGNATURE_MAX_SIZE #define PSA_SIGNATURE_MAX_SIZE … #endif /** Sufficient output buffer size for psa_asymmetric_encrypt(). * * This macro returns a sufficient buffer size for a ciphertext produced using * a key of the specified type and size, with the specified algorithm. * Note that the actual size of the ciphertext may be smaller, depending * on the algorithm. * * \warning This function may call its arguments multiple times or * zero times, so you should not pass arguments that contain * side effects. * * \param key_type An asymmetric key type (this may indifferently be a * key pair type or a public key type). * \param key_bits The size of the key in bits. * \param alg The asymmetric encryption algorithm. * * \return If the parameters are valid and supported, return * a buffer size in bytes that guarantees that * psa_asymmetric_encrypt() will not fail with * #PSA_ERROR_BUFFER_TOO_SMALL. * If the parameters are a valid combination that is not supported, * return either a sensible size or 0. * If the parameters are not valid, the * return value is unspecified. */ #define PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE(key_type, key_bits, alg) … /** A sufficient output buffer size for psa_asymmetric_encrypt(), for any * supported asymmetric encryption. * * See also #PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE(\p key_type, \p key_bits, \p alg). */ /* This macro assumes that RSA is the only supported asymmetric encryption. */ #define PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE … /** Sufficient output buffer size for psa_asymmetric_decrypt(). * * This macro returns a sufficient buffer size for a plaintext produced using * a key of the specified type and size, with the specified algorithm. * Note that the actual size of the plaintext may be smaller, depending * on the algorithm. * * \warning This function may call its arguments multiple times or * zero times, so you should not pass arguments that contain * side effects. * * \param key_type An asymmetric key type (this may indifferently be a * key pair type or a public key type). * \param key_bits The size of the key in bits. * \param alg The asymmetric encryption algorithm. * * \return If the parameters are valid and supported, return * a buffer size in bytes that guarantees that * psa_asymmetric_decrypt() will not fail with * #PSA_ERROR_BUFFER_TOO_SMALL. * If the parameters are a valid combination that is not supported, * return either a sensible size or 0. * If the parameters are not valid, the * return value is unspecified. */ #define PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE(key_type, key_bits, alg) … /** A sufficient output buffer size for psa_asymmetric_decrypt(), for any * supported asymmetric decryption. * * This macro assumes that RSA is the only supported asymmetric encryption. * * See also #PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE(\p key_type, \p key_bits, \p alg). */ #define PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE … /* Maximum size of the ASN.1 encoding of an INTEGER with the specified * number of bits. * * This definition assumes that bits <= 2^19 - 9 so that the length field * is at most 3 bytes. The length of the encoding is the length of the * bit string padded to a whole number of bytes plus: * - 1 type byte; * - 1 to 3 length bytes; * - 0 to 1 bytes of leading 0 due to the sign bit. */ #define PSA_KEY_EXPORT_ASN1_INTEGER_MAX_SIZE(bits) … /* Maximum size of the export encoding of an RSA public key. * Assumes that the public exponent is less than 2^32. * * RSAPublicKey ::= SEQUENCE { * modulus INTEGER, -- n * publicExponent INTEGER } -- e * * - 4 bytes of SEQUENCE overhead; * - n : INTEGER; * - 7 bytes for the public exponent. */ #define PSA_KEY_EXPORT_RSA_PUBLIC_KEY_MAX_SIZE(key_bits) … /* Maximum size of the export encoding of an RSA key pair. * Assumes that the public exponent is less than 2^32 and that the size * difference between the two primes is at most 1 bit. * * RSAPrivateKey ::= SEQUENCE { * version Version, -- 0 * modulus INTEGER, -- N-bit * publicExponent INTEGER, -- 32-bit * privateExponent INTEGER, -- N-bit * prime1 INTEGER, -- N/2-bit * prime2 INTEGER, -- N/2-bit * exponent1 INTEGER, -- N/2-bit * exponent2 INTEGER, -- N/2-bit * coefficient INTEGER, -- N/2-bit * } * * - 4 bytes of SEQUENCE overhead; * - 3 bytes of version; * - 7 half-size INTEGERs plus 2 full-size INTEGERs, * overapproximated as 9 half-size INTEGERS; * - 7 bytes for the public exponent. */ #define PSA_KEY_EXPORT_RSA_KEY_PAIR_MAX_SIZE(key_bits) … /* Maximum size of the export encoding of a DSA public key. * * SubjectPublicKeyInfo ::= SEQUENCE { * algorithm AlgorithmIdentifier, * subjectPublicKey BIT STRING } -- contains DSAPublicKey * AlgorithmIdentifier ::= SEQUENCE { * algorithm OBJECT IDENTIFIER, * parameters Dss-Params } -- SEQUENCE of 3 INTEGERs * DSAPublicKey ::= INTEGER -- public key, Y * * - 3 * 4 bytes of SEQUENCE overhead; * - 1 + 1 + 7 bytes of algorithm (DSA OID); * - 4 bytes of BIT STRING overhead; * - 3 full-size INTEGERs (p, g, y); * - 1 + 1 + 32 bytes for 1 sub-size INTEGER (q <= 256 bits). */ #define PSA_KEY_EXPORT_DSA_PUBLIC_KEY_MAX_SIZE(key_bits) … /* Maximum size of the export encoding of a DSA key pair. * * DSAPrivateKey ::= SEQUENCE { * version Version, -- 0 * prime INTEGER, -- p * subprime INTEGER, -- q * generator INTEGER, -- g * public INTEGER, -- y * private INTEGER, -- x * } * * - 4 bytes of SEQUENCE overhead; * - 3 bytes of version; * - 3 full-size INTEGERs (p, g, y); * - 2 * (1 + 1 + 32) bytes for 2 sub-size INTEGERs (q, x <= 256 bits). */ #define PSA_KEY_EXPORT_DSA_KEY_PAIR_MAX_SIZE(key_bits) … /* Maximum size of the export encoding of an ECC public key. * * The representation of an ECC public key is: * - The byte 0x04; * - `x_P` as a `ceiling(m/8)`-byte string, big-endian; * - `y_P` as a `ceiling(m/8)`-byte string, big-endian; * - where m is the bit size associated with the curve. * * - 1 byte + 2 * point size. */ #define PSA_KEY_EXPORT_ECC_PUBLIC_KEY_MAX_SIZE(key_bits) … /* Maximum size of the export encoding of an ECC key pair. * * An ECC key pair is represented by the secret value. */ #define PSA_KEY_EXPORT_ECC_KEY_PAIR_MAX_SIZE(key_bits) … /* Maximum size of the export encoding of an DH key pair. * * An DH key pair is represented by the secret value. */ #define PSA_KEY_EXPORT_FFDH_KEY_PAIR_MAX_SIZE(key_bits) … /* Maximum size of the export encoding of an DH public key. */ #define PSA_KEY_EXPORT_FFDH_PUBLIC_KEY_MAX_SIZE(key_bits) … /** Sufficient output buffer size for psa_export_key() or * psa_export_public_key(). * * This macro returns a compile-time constant if its arguments are * compile-time constants. * * \warning This macro may evaluate its arguments multiple times or * zero times, so you should not pass arguments that contain * side effects. * * The following code illustrates how to allocate enough memory to export * a key by querying the key type and size at runtime. * \code{c} * psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; * psa_status_t status; * status = psa_get_key_attributes(key, &attributes); * if (status != PSA_SUCCESS) handle_error(...); * psa_key_type_t key_type = psa_get_key_type(&attributes); * size_t key_bits = psa_get_key_bits(&attributes); * size_t buffer_size = PSA_EXPORT_KEY_OUTPUT_SIZE(key_type, key_bits); * psa_reset_key_attributes(&attributes); * uint8_t *buffer = malloc(buffer_size); * if (buffer == NULL) handle_error(...); * size_t buffer_length; * status = psa_export_key(key, buffer, buffer_size, &buffer_length); * if (status != PSA_SUCCESS) handle_error(...); * \endcode * * \param key_type A supported key type. * \param key_bits The size of the key in bits. * * \return If the parameters are valid and supported, return * a buffer size in bytes that guarantees that * psa_export_key() or psa_export_public_key() will not fail with * #PSA_ERROR_BUFFER_TOO_SMALL. * If the parameters are a valid combination that is not supported, * return either a sensible size or 0. * If the parameters are not valid, the return value is unspecified. */ #define PSA_EXPORT_KEY_OUTPUT_SIZE(key_type, key_bits) … /** Sufficient output buffer size for psa_export_public_key(). * * This macro returns a compile-time constant if its arguments are * compile-time constants. * * \warning This macro may evaluate its arguments multiple times or * zero times, so you should not pass arguments that contain * side effects. * * The following code illustrates how to allocate enough memory to export * a public key by querying the key type and size at runtime. * \code{c} * psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; * psa_status_t status; * status = psa_get_key_attributes(key, &attributes); * if (status != PSA_SUCCESS) handle_error(...); * psa_key_type_t key_type = psa_get_key_type(&attributes); * size_t key_bits = psa_get_key_bits(&attributes); * size_t buffer_size = PSA_EXPORT_PUBLIC_KEY_OUTPUT_SIZE(key_type, key_bits); * psa_reset_key_attributes(&attributes); * uint8_t *buffer = malloc(buffer_size); * if (buffer == NULL) handle_error(...); * size_t buffer_length; * status = psa_export_public_key(key, buffer, buffer_size, &buffer_length); * if (status != PSA_SUCCESS) handle_error(...); * \endcode * * \param key_type A public key or key pair key type. * \param key_bits The size of the key in bits. * * \return If the parameters are valid and supported, return * a buffer size in bytes that guarantees that * psa_export_public_key() will not fail with * #PSA_ERROR_BUFFER_TOO_SMALL. * If the parameters are a valid combination that is not * supported, return either a sensible size or 0. * If the parameters are not valid, * the return value is unspecified. * * If the parameters are valid and supported, * return the same result as * #PSA_EXPORT_KEY_OUTPUT_SIZE( * \p #PSA_KEY_TYPE_PUBLIC_KEY_OF_KEY_PAIR(\p key_type), * \p key_bits). */ #define PSA_EXPORT_PUBLIC_KEY_OUTPUT_SIZE(key_type, key_bits) … /** Sufficient buffer size for exporting any asymmetric key pair. * * This macro expands to a compile-time constant integer. This value is * a sufficient buffer size when calling psa_export_key() to export any * asymmetric key pair, regardless of the exact key type and key size. * * See also #PSA_EXPORT_KEY_OUTPUT_SIZE(\p key_type, \p key_bits). */ #define PSA_EXPORT_KEY_PAIR_MAX_SIZE … #if defined(PSA_WANT_KEY_TYPE_ECC_KEY_PAIR_BASIC) && \ (PSA_KEY_EXPORT_ECC_KEY_PAIR_MAX_SIZE(PSA_VENDOR_ECC_MAX_CURVE_BITS) > \ PSA_EXPORT_KEY_PAIR_MAX_SIZE) #undef PSA_EXPORT_KEY_PAIR_MAX_SIZE #define PSA_EXPORT_KEY_PAIR_MAX_SIZE … #endif #if defined(PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_BASIC) && \ (PSA_KEY_EXPORT_RSA_KEY_PAIR_MAX_SIZE(PSA_VENDOR_RSA_MAX_KEY_BITS) > \ PSA_EXPORT_KEY_PAIR_MAX_SIZE) #undef PSA_EXPORT_KEY_PAIR_MAX_SIZE #define PSA_EXPORT_KEY_PAIR_MAX_SIZE … #endif #if defined(PSA_WANT_KEY_TYPE_DH_KEY_PAIR_BASIC) && \ (PSA_KEY_EXPORT_FFDH_KEY_PAIR_MAX_SIZE(PSA_VENDOR_FFDH_MAX_KEY_BITS) > \ PSA_EXPORT_KEY_PAIR_MAX_SIZE) #undef PSA_EXPORT_KEY_PAIR_MAX_SIZE #define PSA_EXPORT_KEY_PAIR_MAX_SIZE … #endif /** Sufficient buffer size for exporting any asymmetric public key. * * This macro expands to a compile-time constant integer. This value is * a sufficient buffer size when calling psa_export_key() or * psa_export_public_key() to export any asymmetric public key, * regardless of the exact key type and key size. * * See also #PSA_EXPORT_PUBLIC_KEY_OUTPUT_SIZE(\p key_type, \p key_bits). */ #define PSA_EXPORT_PUBLIC_KEY_MAX_SIZE … #if defined(PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY) && \ (PSA_KEY_EXPORT_ECC_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_ECC_MAX_CURVE_BITS) > \ PSA_EXPORT_PUBLIC_KEY_MAX_SIZE) #undef PSA_EXPORT_PUBLIC_KEY_MAX_SIZE #define PSA_EXPORT_PUBLIC_KEY_MAX_SIZE … #endif #if defined(PSA_WANT_KEY_TYPE_RSA_PUBLIC_KEY) && \ (PSA_KEY_EXPORT_RSA_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_RSA_MAX_KEY_BITS) > \ PSA_EXPORT_PUBLIC_KEY_MAX_SIZE) #undef PSA_EXPORT_PUBLIC_KEY_MAX_SIZE #define PSA_EXPORT_PUBLIC_KEY_MAX_SIZE … #endif #if defined(PSA_WANT_KEY_TYPE_DH_PUBLIC_KEY) && \ (PSA_KEY_EXPORT_FFDH_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_FFDH_MAX_KEY_BITS) > \ PSA_EXPORT_PUBLIC_KEY_MAX_SIZE) #undef PSA_EXPORT_PUBLIC_KEY_MAX_SIZE #define PSA_EXPORT_PUBLIC_KEY_MAX_SIZE … #endif /** Sufficient output buffer size for psa_raw_key_agreement(). * * This macro returns a compile-time constant if its arguments are * compile-time constants. * * \warning This macro may evaluate its arguments multiple times or * zero times, so you should not pass arguments that contain * side effects. * * See also #PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE. * * \param key_type A supported key type. * \param key_bits The size of the key in bits. * * \return If the parameters are valid and supported, return * a buffer size in bytes that guarantees that * psa_raw_key_agreement() will not fail with * #PSA_ERROR_BUFFER_TOO_SMALL. * If the parameters are a valid combination that * is not supported, return either a sensible size or 0. * If the parameters are not valid, * the return value is unspecified. */ #define PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE(key_type, key_bits) … /** Maximum size of the output from psa_raw_key_agreement(). * * This macro expands to a compile-time constant integer. This value is the * maximum size of the output any raw key agreement algorithm, in bytes. * * See also #PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE(\p key_type, \p key_bits). */ #define PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE … #if defined(PSA_WANT_ALG_ECDH) && \ (PSA_BITS_TO_BYTES(PSA_VENDOR_ECC_MAX_CURVE_BITS) > PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE) #undef PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE #define PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE … #endif #if defined(PSA_WANT_ALG_FFDH) && \ (PSA_BITS_TO_BYTES(PSA_VENDOR_FFDH_MAX_KEY_BITS) > PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE) #undef PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE #define PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE … #endif /** The default IV size for a cipher algorithm, in bytes. * * The IV that is generated as part of a call to #psa_cipher_encrypt() is always * the default IV length for the algorithm. * * This macro can be used to allocate a buffer of sufficient size to * store the IV output from #psa_cipher_generate_iv() when using * a multi-part cipher operation. * * See also #PSA_CIPHER_IV_MAX_SIZE. * * \warning This macro may evaluate its arguments multiple times or * zero times, so you should not pass arguments that contain * side effects. * * \param key_type A symmetric key type that is compatible with algorithm \p alg. * * \param alg A cipher algorithm (\c PSA_ALG_XXX value such that #PSA_ALG_IS_CIPHER(\p alg) is true). * * \return The default IV size for the specified key type and algorithm. * If the algorithm does not use an IV, return 0. * If the key type or cipher algorithm is not recognized, * or the parameters are incompatible, return 0. */ #define PSA_CIPHER_IV_LENGTH(key_type, alg) … /** The maximum IV size for all supported cipher algorithms, in bytes. * * See also #PSA_CIPHER_IV_LENGTH(). */ #define PSA_CIPHER_IV_MAX_SIZE … /** The maximum size of the output of psa_cipher_encrypt(), in bytes. * * If the size of the output buffer is at least this large, it is guaranteed * that psa_cipher_encrypt() will not fail due to an insufficient buffer size. * Depending on the algorithm, the actual size of the output might be smaller. * * See also #PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE(\p input_length). * * \warning This macro may evaluate its arguments multiple times or * zero times, so you should not pass arguments that contain * side effects. * * \param key_type A symmetric key type that is compatible with algorithm * alg. * \param alg A cipher algorithm (\c PSA_ALG_XXX value such that * #PSA_ALG_IS_CIPHER(\p alg) is true). * \param input_length Size of the input in bytes. * * \return A sufficient output size for the specified key type and * algorithm. If the key type or cipher algorithm is not * recognized, or the parameters are incompatible, * return 0. */ #define PSA_CIPHER_ENCRYPT_OUTPUT_SIZE(key_type, alg, input_length) … /** A sufficient output buffer size for psa_cipher_encrypt(), for any of the * supported key types and cipher algorithms. * * If the size of the output buffer is at least this large, it is guaranteed * that psa_cipher_encrypt() will not fail due to an insufficient buffer size. * * See also #PSA_CIPHER_ENCRYPT_OUTPUT_SIZE(\p key_type, \p alg, \p input_length). * * \param input_length Size of the input in bytes. * */ #define PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE(input_length) … /** The maximum size of the output of psa_cipher_decrypt(), in bytes. * * If the size of the output buffer is at least this large, it is guaranteed * that psa_cipher_decrypt() will not fail due to an insufficient buffer size. * Depending on the algorithm, the actual size of the output might be smaller. * * See also #PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE(\p input_length). * * \param key_type A symmetric key type that is compatible with algorithm * alg. * \param alg A cipher algorithm (\c PSA_ALG_XXX value such that * #PSA_ALG_IS_CIPHER(\p alg) is true). * \param input_length Size of the input in bytes. * * \return A sufficient output size for the specified key type and * algorithm. If the key type or cipher algorithm is not * recognized, or the parameters are incompatible, * return 0. */ #define PSA_CIPHER_DECRYPT_OUTPUT_SIZE(key_type, alg, input_length) … /** A sufficient output buffer size for psa_cipher_decrypt(), for any of the * supported key types and cipher algorithms. * * If the size of the output buffer is at least this large, it is guaranteed * that psa_cipher_decrypt() will not fail due to an insufficient buffer size. * * See also #PSA_CIPHER_DECRYPT_OUTPUT_SIZE(\p key_type, \p alg, \p input_length). * * \param input_length Size of the input in bytes. */ #define PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE(input_length) … /** A sufficient output buffer size for psa_cipher_update(). * * If the size of the output buffer is at least this large, it is guaranteed * that psa_cipher_update() will not fail due to an insufficient buffer size. * The actual size of the output might be smaller in any given call. * * See also #PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE(\p input_length). * * \param key_type A symmetric key type that is compatible with algorithm * alg. * \param alg A cipher algorithm (PSA_ALG_XXX value such that * #PSA_ALG_IS_CIPHER(\p alg) is true). * \param input_length Size of the input in bytes. * * \return A sufficient output size for the specified key type and * algorithm. If the key type or cipher algorithm is not * recognized, or the parameters are incompatible, return 0. */ #define PSA_CIPHER_UPDATE_OUTPUT_SIZE(key_type, alg, input_length) … /** A sufficient output buffer size for psa_cipher_update(), for any of the * supported key types and cipher algorithms. * * If the size of the output buffer is at least this large, it is guaranteed * that psa_cipher_update() will not fail due to an insufficient buffer size. * * See also #PSA_CIPHER_UPDATE_OUTPUT_SIZE(\p key_type, \p alg, \p input_length). * * \param input_length Size of the input in bytes. */ #define PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE(input_length) … /** A sufficient ciphertext buffer size for psa_cipher_finish(). * * If the size of the ciphertext buffer is at least this large, it is * guaranteed that psa_cipher_finish() will not fail due to an insufficient * ciphertext buffer size. The actual size of the output might be smaller in * any given call. * * See also #PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE(). * * \param key_type A symmetric key type that is compatible with algorithm * alg. * \param alg A cipher algorithm (PSA_ALG_XXX value such that * #PSA_ALG_IS_CIPHER(\p alg) is true). * \return A sufficient output size for the specified key type and * algorithm. If the key type or cipher algorithm is not * recognized, or the parameters are incompatible, return 0. */ #define PSA_CIPHER_FINISH_OUTPUT_SIZE(key_type, alg) … /** A sufficient ciphertext buffer size for psa_cipher_finish(), for any of the * supported key types and cipher algorithms. * * See also #PSA_CIPHER_FINISH_OUTPUT_SIZE(\p key_type, \p alg). */ #define PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE … #endif /* PSA_CRYPTO_SIZES_H */
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