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mbedtls/include/psa/crypto.h
Gilles Peskine f5b9fa13e0 Documentation clarifications 
Clarify or add the documentation of some functions and constants.

Add a note about what the __DOXYGEN_ONLY__ section is for.
2018-09-05 11:53:25 +03:00

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/**
* \file psa/crypto.h
* \brief Platform Security Architecture cryptography module
*/
#ifndef PSA_CRYPTO_H
#define PSA_CRYPTO_H
#include "crypto_platform.h"
#include <stddef.h>
#ifdef __DOXYGEN_ONLY__
/* This __DOXYGEN_ONLY__ block contains mock definitions for things that
* must be defined in the crypto_platform.h header. These mock definitions
* are present in this file as a convenience to generate pretty-printed
* documentation that includes those definitions. */
/** \defgroup platform Implementation-specific definitions
* @{
*/
/** \brief Key slot number.
*
* This type represents key slots. It must be an unsigned integral
* type. The choice of type is implementation-dependent.
* 0 is not a valid key slot number. The meaning of other values is
* implementation dependent.
*
* At any given point in time, each key slot either contains a
* cryptographic object, or is empty. Key slots are persistent:
* once set, the cryptographic object remains in the key slot until
* explicitly destroyed.
*/
typedef _unsigned_integral_type_ psa_key_slot_t;
/**@}*/
#endif /* __DOXYGEN_ONLY__ */
#ifdef __cplusplus
extern "C" {
#endif
/** \defgroup basic Basic definitions
* @{
*/
/**
* \brief Function return status.
*
* Zero indicates success, anything else indicates an error.
*/
typedef enum {
/** The action was completed successfully. */
PSA_SUCCESS = 0,
/** The requested operation or a parameter is not supported
by this implementation. */
PSA_ERROR_NOT_SUPPORTED,
/** The requested action is denied by a policy. */
PSA_ERROR_NOT_PERMITTED,
/** An output buffer is too small. */
PSA_ERROR_BUFFER_TOO_SMALL,
/** A slot is occupied, but must be empty to carry out the
requested action. */
PSA_ERROR_OCCUPIED_SLOT,
/** A slot is empty, but must be occupied to carry out the
requested action. */
PSA_ERROR_EMPTY_SLOT,
/** The requested action cannot be performed in the current state. */
PSA_ERROR_BAD_STATE,
/** The parameters passed to the function are invalid. */
PSA_ERROR_INVALID_ARGUMENT,
/** There is not enough runtime memory. */
PSA_ERROR_INSUFFICIENT_MEMORY,
/** There is not enough persistent storage. */
PSA_ERROR_INSUFFICIENT_STORAGE,
/** There was a communication failure inside the implementation. */
PSA_ERROR_COMMUNICATION_FAILURE,
/** There was a storage failure that may have led to data loss. */
PSA_ERROR_STORAGE_FAILURE,
/** A hardware failure was detected. */
PSA_ERROR_HARDWARE_FAILURE,
/** A tampering attempt was detected. */
PSA_ERROR_TAMPERING_DETECTED,
/** There is not enough entropy to generate random data needed
for the requested action. */
PSA_ERROR_INSUFFICIENT_ENTROPY,
/** The signature, MAC or hash is incorrect. */
PSA_ERROR_INVALID_SIGNATURE,
/** The decrypted padding is incorrect. */
PSA_ERROR_INVALID_PADDING,
/** An error occurred that does not correspond to any defined
failure cause. */
PSA_ERROR_UNKNOWN_ERROR,
} psa_status_t;
/**
* \brief Library initialization.
*
* Applications must call this function before calling any other
* function in this module.
*
* Applications may call this function more than once. Once a call
* succeeds, subsequent calls are guaranteed to succeed.
*
* \retval PSA_SUCCESS
* \retval PSA_ERROR_INSUFFICIENT_MEMORY
* \retval PSA_ERROR_COMMUNICATION_FAILURE
* \retval PSA_ERROR_HARDWARE_FAILURE
* \retval PSA_ERROR_TAMPERING_DETECTED
* \retval PSA_ERROR_INSUFFICIENT_ENTROPY
*/
psa_status_t psa_crypto_init(void);
#define PSA_BITS_TO_BYTES(bits) (((bits) + 7) / 8)
#define PSA_BYTES_TO_BITS(bytes) ((bytes) * 8)
/**@}*/
/** \defgroup crypto_types Key and algorithm types
* @{
*/
/** \brief Encoding of a key type.
*/
typedef uint32_t psa_key_type_t;
/** An invalid key type value.
*
* Zero is not the encoding of any key type.
*/
#define PSA_KEY_TYPE_NONE ((psa_key_type_t)0x00000000)
/** Vendor-defined flag
*
* Key types defined by this standard will never have the
* #PSA_KEY_TYPE_VENDOR_FLAG bit set. Vendors who define additional key types
* must use an encoding with the #PSA_KEY_TYPE_VENDOR_FLAG bit set and should
* respect the bitwise structure used by standard encodings whenever practical.
*/
#define PSA_KEY_TYPE_VENDOR_FLAG ((psa_key_type_t)0x80000000)
#define PSA_KEY_TYPE_CATEGORY_MASK ((psa_key_type_t)0x7e000000)
#define PSA_KEY_TYPE_RAW_DATA ((psa_key_type_t)0x02000000)
#define PSA_KEY_TYPE_CATEGORY_SYMMETRIC ((psa_key_type_t)0x04000000)
#define PSA_KEY_TYPE_CATEGORY_ASYMMETRIC ((psa_key_type_t)0x06000000)
#define PSA_KEY_TYPE_PAIR_FLAG ((psa_key_type_t)0x01000000)
#define PSA_KEY_TYPE_HMAC ((psa_key_type_t)0x02000001)
#define PSA_KEY_TYPE_AES ((psa_key_type_t)0x04000001)
#define PSA_KEY_TYPE_DES ((psa_key_type_t)0x04000002)
#define PSA_KEY_TYPE_CAMELLIA ((psa_key_type_t)0x04000003)
#define PSA_KEY_TYPE_ARC4 ((psa_key_type_t)0x04000004)
/** RSA public key. */
#define PSA_KEY_TYPE_RSA_PUBLIC_KEY ((psa_key_type_t)0x06010000)
/** RSA key pair (private and public key). */
#define PSA_KEY_TYPE_RSA_KEYPAIR ((psa_key_type_t)0x07010000)
#define PSA_KEY_TYPE_ECC_BASE ((psa_key_type_t)0x06030000)
#define PSA_KEY_TYPE_ECC_CURVE_MASK ((psa_key_type_t)0x0000ffff)
/** Whether a key type is vendor-defined. */
#define PSA_KEY_TYPE_IS_VENDOR_DEFINED(type) \
(((type) & PSA_KEY_TYPE_VENDOR_FLAG) != 0)
#define PSA_KEY_TYPE_IS_RAW_BYTES(type) \
(((type) & PSA_KEY_TYPE_CATEGORY_MASK) == PSA_KEY_TYPE_RAW_DATA || \
((type) & PSA_KEY_TYPE_CATEGORY_MASK) == PSA_KEY_TYPE_CATEGORY_SYMMETRIC)
#define PSA_KEY_TYPE_IS_ASYMMETRIC(type) \
(((type) & PSA_KEY_TYPE_CATEGORY_MASK) == PSA_KEY_TYPE_CATEGORY_ASYMMETRIC)
#define PSA_KEY_TYPE_IS_PUBLIC_KEY(type) \
(((type) & (PSA_KEY_TYPE_CATEGORY_MASK | PSA_KEY_TYPE_PAIR_FLAG) == \
PSA_KEY_TYPE_CATEGORY_ASYMMETRIC))
#define PSA_KEY_TYPE_IS_KEYPAIR(type) \
(((type) & (PSA_KEY_TYPE_CATEGORY_MASK | PSA_KEY_TYPE_PAIR_FLAG)) == \
(PSA_KEY_TYPE_CATEGORY_ASYMMETRIC | PSA_KEY_TYPE_PAIR_FLAG))
#define PSA_KEY_TYPE_IS_RSA(type) \
(((type) & ~PSA_KEY_TYPE_PAIR_FLAG) == PSA_KEY_TYPE_RSA_PUBLIC_KEY)
#define PSA_KEY_TYPE_IS_ECC(type) \
(((type) & ~PSA_KEY_TYPE_ECC_CURVE_MASK) == PSA_KEY_TYPE_ECC_BASE)
#define PSA_BLOCK_CIPHER_BLOCK_SIZE(key_type) \
( \
(type) == PSA_KEY_TYPE_AES ? 16 : \
(type) == PSA_KEY_TYPE_DES ? 8 : \
(type) == PSA_KEY_TYPE_CAMELLIA ? 16 : \
0)
/** \brief Encoding of a cryptographic algorithm.
*
* For algorithms that can be applied to multiple key types, this type
* does not encode the key type. For example, for symmetric ciphers
* based on a block cipher, #psa_algorithm_t encodes the block cipher
* mode and the padding mode while the block cipher itself is encoded
* via #psa_key_type_t.
*/
typedef uint32_t psa_algorithm_t;
#define PSA_ALG_VENDOR_FLAG ((psa_algorithm_t)0x80000000)
#define PSA_ALG_CATEGORY_MASK ((psa_algorithm_t)0x7f000000)
#define PSA_ALG_CATEGORY_HASH ((psa_algorithm_t)0x01000000)
#define PSA_ALG_CATEGORY_MAC ((psa_algorithm_t)0x02000000)
#define PSA_ALG_CATEGORY_CIPHER ((psa_algorithm_t)0x04000000)
#define PSA_ALG_CATEGORY_AEAD ((psa_algorithm_t)0x06000000)
#define PSA_ALG_CATEGORY_SIGN ((psa_algorithm_t)0x10000000)
#define PSA_ALG_CATEGORY_ASYMMETRIC_ENCRYPTION ((psa_algorithm_t)0x12000000)
#define PSA_ALG_CATEGORY_KEY_AGREEMENT ((psa_algorithm_t)0x22000000)
#define PSA_ALG_CATEGORY_KEY_DERIVATION ((psa_algorithm_t)0x30000000)
#define PSA_ALG_IS_VENDOR_DEFINED(alg) \
(((alg) & PSA_ALG_VENDOR_FLAG) != 0)
/** Whether the specified algorithm is a hash algorithm.
*
* \param alg An algorithm identifier (\c PSA_ALG_XXX value)
*
* \return 1 if \c alg is a hash algorithm, 0 otherwise.
* This macro may return either 0 or 1 if \c alg is not a valid
* algorithm identifier. */
#define PSA_ALG_IS_HASH(alg) \
(((alg) & PSA_ALG_CATEGORY_MASK) == PSA_ALG_CATEGORY_HASH)
#define PSA_ALG_IS_MAC(alg) \
(((alg) & PSA_ALG_CATEGORY_MASK) == PSA_ALG_CATEGORY_MAC)
#define PSA_ALG_IS_CIPHER(alg) \
(((alg) & PSA_ALG_CATEGORY_MASK) == PSA_ALG_CATEGORY_CIPHER)
#define PSA_ALG_IS_AEAD(alg) \
(((alg) & PSA_ALG_CATEGORY_MASK) == PSA_ALG_CATEGORY_AEAD)
#define PSA_ALG_IS_SIGN(alg) \
(((alg) & PSA_ALG_CATEGORY_MASK) == PSA_ALG_CATEGORY_SIGN)
#define PSA_ALG_IS_ASYMMETRIC_ENCRYPTION(alg) \
(((alg) & PSA_ALG_CATEGORY_MASK) == PSA_ALG_CATEGORY_ASYMMETRIC_ENCRYPTION)
#define PSA_ALG_IS_KEY_AGREEMENT(alg) \
(((alg) & PSA_ALG_CATEGORY_MASK) == PSA_ALG_CATEGORY_KEY_AGREEMENT)
#define PSA_ALG_IS_KEY_DERIVATION(alg) \
(((alg) & PSA_ALG_CATEGORY_MASK) == PSA_ALG_CATEGORY_KEY_DERIVATION)
#define PSA_ALG_HASH_MASK ((psa_algorithm_t)0x000000ff)
#define PSA_ALG_MD2 ((psa_algorithm_t)0x01000001)
#define PSA_ALG_MD4 ((psa_algorithm_t)0x01000002)
#define PSA_ALG_MD5 ((psa_algorithm_t)0x01000003)
#define PSA_ALG_SHA_256_128 ((psa_algorithm_t)0x01000004)
#define PSA_ALG_RIPEMD160 ((psa_algorithm_t)0x01000005)
#define PSA_ALG_SHA_1 ((psa_algorithm_t)0x01000006)
#define PSA_ALG_SHA_256_160 ((psa_algorithm_t)0x01000007)
#define PSA_ALG_SHA_224 ((psa_algorithm_t)0x01000008)
#define PSA_ALG_SHA_256 ((psa_algorithm_t)0x01000009)
#define PSA_ALG_SHA_384 ((psa_algorithm_t)0x0100000a)
#define PSA_ALG_SHA_512 ((psa_algorithm_t)0x0100000b)
#define PSA_ALG_SHA_512_224 ((psa_algorithm_t)0x0100000c)
#define PSA_ALG_SHA_512_256 ((psa_algorithm_t)0x0100000d)
#define PSA_ALG_SHA3_224 ((psa_algorithm_t)0x01000010)
#define PSA_ALG_SHA3_256 ((psa_algorithm_t)0x01000011)
#define PSA_ALG_SHA3_384 ((psa_algorithm_t)0x01000012)
#define PSA_ALG_SHA3_512 ((psa_algorithm_t)0x01000013)
#define PSA_ALG_MAC_SUBCATEGORY_MASK ((psa_algorithm_t)0x00c00000)
#define PSA_ALG_HMAC_BASE ((psa_algorithm_t)0x02800000)
#define PSA_ALG_HMAC(hash_alg) \
(PSA_ALG_HMAC_BASE | ((hash_alg) & PSA_ALG_HASH_MASK))
#define PSA_ALG_HMAC_HASH(hmac_alg) \
(PSA_ALG_CATEGORY_HASH | ((hmac_alg) & PSA_ALG_HASH_MASK))
#define PSA_ALG_IS_HMAC(alg) \
(((alg) & (PSA_ALG_CATEGORY_MASK | PSA_ALG_MAC_SUBCATEGORY_MASK)) == \
PSA_ALG_HMAC_BASE)
#define PSA_ALG_CIPHER_MAC_BASE ((psa_algorithm_t)0x02c00000)
#define PSA_ALG_CBC_MAC ((psa_algorithm_t)0x02c00001)
#define PSA_ALG_CMAC ((psa_algorithm_t)0x02c00002)
#define PSA_ALG_GMAC ((psa_algorithm_t)0x02c00003)
#define PSA_ALG_IS_CIPHER_MAC(alg) \
(((alg) & (PSA_ALG_CATEGORY_MASK | PSA_ALG_MAC_SUBCATEGORY_MASK)) == \
PSA_ALG_CIPHER_MAC_BASE)
#define PSA_ALG_CIPHER_SUBCATEGORY_MASK ((psa_algorithm_t)0x00c00000)
#define PSA_ALG_BLOCK_CIPHER_BASE ((psa_algorithm_t)0x04000000)
#define PSA_ALG_BLOCK_CIPHER_MODE_MASK ((psa_algorithm_t)0x000000ff)
#define PSA_ALG_BLOCK_CIPHER_PADDING_MASK ((psa_algorithm_t)0x003f0000)
#define PSA_ALG_BLOCK_CIPHER_PAD_NONE ((psa_algorithm_t)0x00000000)
#define PSA_ALG_BLOCK_CIPHER_PAD_PKCS7 ((psa_algorithm_t)0x00010000)
#define PSA_ALG_IS_BLOCK_CIPHER(alg) \
(((alg) & (PSA_ALG_CATEGORY_MASK | PSA_ALG_CIPHER_SUBCATEGORY_MASK)) == \
PSA_ALG_BLOCK_CIPHER_BASE)
#define PSA_ALG_CBC_BASE ((psa_algorithm_t)0x04000001)
#define PSA_ALG_CFB_BASE ((psa_algorithm_t)0x04000002)
#define PSA_ALG_OFB_BASE ((psa_algorithm_t)0x04000003)
#define PSA_ALG_XTS_BASE ((psa_algorithm_t)0x04000004)
#define PSA_ALG_STREAM_CIPHER ((psa_algorithm_t)0x04800000)
#define PSA_ALG_CTR ((psa_algorithm_t)0x04800001)
#define PSA_ALG_ARC4 ((psa_algorithm_t)0x04800002)
#define PSA_ALG_CCM ((psa_algorithm_t)0x06000001)
#define PSA_ALG_GCM ((psa_algorithm_t)0x06000002)
#define PSA_ALG_RSA_PKCS1V15_RAW ((psa_algorithm_t)0x10010000)
#define PSA_ALG_RSA_PSS_MGF1 ((psa_algorithm_t)0x10020000)
#define PSA_ALG_RSA_OAEP ((psa_algorithm_t)0x12020000)
#define PSA_ALG_RSA_PKCS1V15(hash_alg) \
(PSA_ALG_RSA_PKCS1V15_RAW | ((hash_alg) & PSA_ALG_HASH_MASK))
#define PSA_ALG_IS_RSA_PKCS1V15(alg) \
(((alg) & 0x7fffff00) == PSA_ALG_RSA_PKCS1V15_RAW)
#define PSA_ALG_RSA_GET_HASH(alg) \
(((alg) & PSA_ALG_HASH_MASK) | PSA_ALG_CATEGORY_HASH)
/**@}*/
/** \defgroup key_management Key management
* @{
*/
/**
* \brief Import a key in binary format.
*
* This function supports any output from psa_export_key(). Refer to the
* documentation of psa_export_key() for the format for each key type.
*
* \param key Slot where the key will be stored. This must be a
* valid slot for a key of the chosen type. It must
* be unoccupied.
* \param type Key type (a \c PSA_KEY_TYPE_XXX value).
* \param data Buffer containing the key data.
* \param data_length Size of the \c data buffer in bytes.
*
* \retval PSA_SUCCESS
* Success.
* \retval PSA_ERROR_NOT_SUPPORTED
* The key type or key size is not supported.
* \retval PSA_ERROR_INVALID_ARGUMENT
* The key slot is invalid,
* or the key data is not correctly formatted.
* \retval PSA_ERROR_OCCUPIED_SLOT
There is already a key in the specified slot.
* \retval PSA_ERROR_INSUFFICIENT_MEMORY
* \retval PSA_ERROR_COMMUNICATION_FAILURE
* \retval PSA_ERROR_HARDWARE_FAILURE
* \retval PSA_ERROR_TAMPERING_DETECTED
*/
psa_status_t psa_import_key(psa_key_slot_t key,
psa_key_type_t type,
const uint8_t *data,
size_t data_length);
/**
* \brief Destroy a key.
*
* \retval PSA_SUCCESS
* \retval PSA_ERROR_EMPTY_SLOT
* \retval PSA_ERROR_COMMUNICATION_FAILURE
* \retval PSA_ERROR_HARDWARE_FAILURE
* \retval PSA_ERROR_TAMPERING_DETECTED
*/
psa_status_t psa_destroy_key(psa_key_slot_t key);
/**
* \brief Get basic metadata about a key.
*
* \param key Slot whose content is queried. This must
* be an occupied key slot.
* \param type On success, the key type (a \c PSA_KEY_TYPE_XXX value).
* This may be a null pointer, in which case the key type
* is not written.
* \param bits On success, the key size in bits.
* This may be a null pointer, in which case the key type
* is not written.
*
* \retval PSA_SUCCESS
* \retval PSA_ERROR_EMPTY_SLOT
* \retval PSA_ERROR_COMMUNICATION_FAILURE
* \retval PSA_ERROR_HARDWARE_FAILURE
* \retval PSA_ERROR_TAMPERING_DETECTED
*/
psa_status_t psa_get_key_information(psa_key_slot_t key,
psa_key_type_t *type,
size_t *bits);
/**
* \brief Export a key in binary format.
*
* The output of this function can be passed to psa_import_key() to
* create an equivalent object.
*
* If a key is created with psa_import_key() and then exported with
* this function, it is not guaranteed that the resulting data is
* identical: the implementation may choose a different representation
* of the same key if the format permits it.
*
* For standard key types, the output format is as follows:
*
* - For symmetric keys (including MAC keys), the format is the
* raw bytes of the key.
* - For DES, the key data consists of 8 bytes. The parity bits must be
* correct.
* - For Triple-DES, the format is the concatenation of the
* two or three DES keys.
* - For RSA key pairs (#PSA_KEY_TYPE_RSA_KEYPAIR), the format
* is the non-encrypted DER representation defined by PKCS\#8 (RFC 5208)
* as PrivateKeyInfo.
* - For RSA public keys (#PSA_KEY_TYPE_RSA_PUBLIC_KEY), the format
* is the DER representation defined by X.509.
*
* \param key Slot whose content is to be exported. This must
* be an occupied key slot.
* \param data Buffer where the key data is to be written.
* \param data_size Size of the \c data buffer in bytes.
* \param data_length On success, the number of bytes
* that make up the key data.
*
* \retval PSA_SUCCESS
* \retval PSA_ERROR_EMPTY_SLOT
* \retval PSA_ERROR_NOT_PERMITTED
* \retval PSA_ERROR_COMMUNICATION_FAILURE
* \retval PSA_ERROR_HARDWARE_FAILURE
* \retval PSA_ERROR_TAMPERING_DETECTED
*/
psa_status_t psa_export_key(psa_key_slot_t key,
uint8_t *data,
size_t data_size,
size_t *data_length);
/**
* \brief Export a public key or the public part of a key pair in binary format.
*
* The output of this function can be passed to psa_import_key() to
* create an object that is equivalent to the public key.
*
* For standard key types, the output format is as follows:
*
* - For RSA keys (#PSA_KEY_TYPE_RSA_KEYPAIR or #PSA_KEY_TYPE_RSA_PUBLIC_KEY),
* the format is the DER representation defined by X.509.
*
* \param key Slot whose content is to be exported. This must
* be an occupied key slot.
* \param data Buffer where the key data is to be written.
* \param data_size Size of the \c data buffer in bytes.
* \param data_length On success, the number of bytes
* that make up the key data.
*
* \retval PSA_SUCCESS
* \retval PSA_ERROR_EMPTY_SLOT
* \retval PSA_ERROR_INVALID_ARGUMENT
* \retval PSA_ERROR_COMMUNICATION_FAILURE
* \retval PSA_ERROR_HARDWARE_FAILURE
* \retval PSA_ERROR_TAMPERING_DETECTED
*/
psa_status_t psa_export_public_key(psa_key_slot_t key,
uint8_t *data,
size_t data_size,
size_t *data_length);
/**@}*/
/** \defgroup policy Key policies
* @{
*/
/** \brief Encoding of permitted usage on a key. */
typedef uint32_t psa_key_usage_t;
#define PSA_KEY_USAGE_EXPORT ((psa_key_usage_t)0x00000001)
#define PSA_KEY_USAGE_ENCRYPT ((psa_key_usage_t)0x00000100)
#define PSA_KEY_USAGE_DECRYPT ((psa_key_usage_t)0x00000200)
#define PSA_KEY_USAGE_SIGN ((psa_key_usage_t)0x00000400)
#define PSA_KEY_USAGE_VERIFY ((psa_key_usage_t)0x00000800)
/** The type of the key policy data structure.
*
* This is an implementation-defined \c struct. Applications should not
* make any assumptions about the content of this structure except
* as directed by the documentation of a specific implementation. */
typedef struct psa_key_policy_s psa_key_policy_t;
/** \brief Initialize a key policy structure to a default that forbids all
* usage of the key. */
void psa_key_policy_init(psa_key_policy_t *policy);
void psa_key_policy_set_usage(psa_key_policy_t *policy,
psa_key_usage_t usage,
psa_algorithm_t alg);
psa_key_usage_t psa_key_policy_get_usage(psa_key_policy_t *policy);
psa_algorithm_t psa_key_policy_get_algorithm(psa_key_policy_t *policy);
/** \brief Set the usage policy on a key slot.
*
* This function must be called on an empty key slot, before importing,
* generating or creating a key in the slot. Changing the policy of an
* existing key is not permitted.
*/
psa_status_t psa_set_key_policy(psa_key_slot_t key,
const psa_key_policy_t *policy);
psa_status_t psa_get_key_policy(psa_key_slot_t key,
psa_key_policy_t *policy);
/**@}*/
/** \defgroup persistence Key lifetime
* @{
*/
/** Encoding of key lifetimes.
*/
typedef uint32_t psa_key_lifetime_t;
/** A volatile key slot retains its content as long as the application is
* running. It is guaranteed to be erased on a power reset.
*/
#define PSA_KEY_LIFETIME_VOLATILE ((psa_key_lifetime_t)0x00000000)
/** A persistent key slot retains its content as long as it is not explicitly
* destroyed.
*/
#define PSA_KEY_LIFETIME_PERSISTENT ((psa_key_lifetime_t)0x00000001)
/** A write-once key slot may not be modified once a key has been set.
* It will retain its content as long as the device remains operational.
*/
#define PSA_KEY_LIFETIME_WRITE_ONCE ((psa_key_lifetime_t)0x7fffffff)
psa_status_t psa_get_key_lifetime(psa_key_slot_t key,
psa_key_lifetime_t *lifetime);
/**@}*/
/** \defgroup hash Message digests
* @{
*/
/** The type of the state data structure for multipart hash operations.
*
* This is an implementation-defined \c struct. Applications should not
* make any assumptions about the content of this structure except
* as directed by the documentation of a specific implementation. */
typedef struct psa_hash_operation_s psa_hash_operation_t;
/** 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(alg) is true).
*
* \return The hash size for the specified hash algorithm.
* If the hash algorithm is not recognized, return 0.
* An implementation may return either 0 or the correct size
* for a hash algorithm that it recognizes, but does not support.
*/
#define PSA_HASH_FINAL_SIZE(alg) \
( \
(alg) == PSA_ALG_MD2 ? 16 : \
(alg) == PSA_ALG_MD4 ? 16 : \
(alg) == PSA_ALG_MD5 ? 16 : \
(alg) == PSA_ALG_SHA_256_128 ? 16 : \
(alg) == PSA_ALG_RIPEMD160 ? 20 : \
(alg) == PSA_ALG_SHA_1 ? 20 : \
(alg) == PSA_ALG_SHA_256_160 ? 20 : \
(alg) == PSA_ALG_SHA_224 ? 28 : \
(alg) == PSA_ALG_SHA_256 ? 32 : \
(alg) == PSA_ALG_SHA_384 ? 48 : \
(alg) == PSA_ALG_SHA_512 ? 64 : \
(alg) == PSA_ALG_SHA_512_224 ? 28 : \
(alg) == PSA_ALG_SHA_512_256 ? 32 : \
(alg) == PSA_ALG_SHA3_224 ? 28 : \
(alg) == PSA_ALG_SHA3_256 ? 32 : \
(alg) == PSA_ALG_SHA3_384 ? 48 : \
(alg) == PSA_ALG_SHA3_512 ? 64 : \
0)
/** Start a multipart hash operation.
*
* The sequence of operations to calculate a hash (message digest)
* is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Call psa_hash_start() to specify the algorithm.
* -# Call psa_hash_update() zero, one or more times, passing a fragment
* of the message each time. The hash that is calculated is the hash
* of the concatenation of these messages in order.
* -# To calculate the hash, call psa_hash_finish().
* To compare the hash with an expected value, call psa_hash_verify().
*
* The application may call psa_hash_abort() at any time after the operation
* has been initialized with psa_hash_start().
*
* After a successful call to psa_hash_start(), the application must
* eventually destroy the operation through one of the following means:
* - A failed call to psa_hash_update().
* - A call to psa_hash_final(), psa_hash_verify() or psa_hash_abort().
*
* \param operation
* \param alg The hash algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_HASH(alg) is true).
*
* \retval PSA_SUCCESS
* Success.
* \retval PSA_ERROR_NOT_SUPPORTED
* \c alg is not supported or is not a hash algorithm.
* \retval PSA_ERROR_INSUFFICIENT_MEMORY
* \retval PSA_ERROR_COMMUNICATION_FAILURE
* \retval PSA_ERROR_HARDWARE_FAILURE
* \retval PSA_ERROR_TAMPERING_DETECTED
*/
psa_status_t psa_hash_start(psa_hash_operation_t *operation,
psa_algorithm_t alg);
/** Add a message fragment to a multipart hash operation.
*
* The application must call psa_hash_start() before calling this function.
*
* If this function returns an error status, the operation becomes inactive.
*
* \param operation Active hash operation.
* \param input Buffer containing the message fragment to hash.
* \param input_length Size of the \c input buffer in bytes.
*
* \retval PSA_SUCCESS
* Success.
* \retval PSA_ERROR_BAD_STATE
* The operation state is not valid (not started, or already completed).
* \retval PSA_ERROR_INSUFFICIENT_MEMORY
* \retval PSA_ERROR_COMMUNICATION_FAILURE
* \retval PSA_ERROR_HARDWARE_FAILURE
* \retval PSA_ERROR_TAMPERING_DETECTED
*/
psa_status_t psa_hash_update(psa_hash_operation_t *operation,
const uint8_t *input,
size_t input_length);
/** Finish the calculation of the hash of a message.
*
* The application must call psa_hash_start() before calling this function.
* This function calculates the hash of the message formed by concatenating
* the inputs passed to preceding calls to psa_hash_update().
*
* When this function returns, the operation becomes inactive.
*
* \warning Applications should not call this function if they expect
* a specific value for the hash. Call psa_hash_verify() instead.
* Beware that comparing integrity or authenticity data such as
* hash values with a function such as \c memcmp is risky
* because the time taken by the comparison may leak information
* about the hashed data which could allow an attacker to guess
* a valid hash and thereby bypass security controls.
*
* \param operation Active hash operation.
* \param hash Buffer where the hash is to be written.
* \param hash_size Size of the \c hash buffer in bytes.
* \param hash_length On success, the number of bytes
* that make up the hash value. This is always
* #PSA_HASH_FINAL_SIZE(alg) where \c alg is the
* hash algorithm that is calculated.
*
* \retval PSA_SUCCESS
* Success.
* \retval PSA_ERROR_BAD_STATE
* The operation state is not valid (not started, or already completed).
* \retval PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \c hash buffer is too small. You can determine a
* sufficient buffer size by calling #PSA_HASH_FINAL_SIZE(alg)
* where \c alg is the hash algorithm that is calculated.
* \retval PSA_ERROR_INSUFFICIENT_MEMORY
* \retval PSA_ERROR_COMMUNICATION_FAILURE
* \retval PSA_ERROR_HARDWARE_FAILURE
* \retval PSA_ERROR_TAMPERING_DETECTED
*/
psa_status_t psa_hash_finish(psa_hash_operation_t *operation,
uint8_t *hash,
size_t hash_size,
size_t *hash_length);
/** Finish the calculation of the hash of a message and compare it with
* an expected value.
*
* The application must call psa_hash_start() before calling this function.
* This function calculates the hash of the message formed by concatenating
* the inputs passed to preceding calls to psa_hash_update(). It then
* compares the calculated hash with the expected hash passed as a
* parameter to this function.
*
* When this function returns, the operation becomes inactive.
*
* \note Applications shall make the best effort to ensure that the
* comparison between the actual hash and the expected hash is performed
* in constant time.
*
* \param operation Active hash operation.
* \param hash Buffer containing the expected hash value.
* \param hash_length Size of the \c hash buffer in bytes.
*
* \retval PSA_SUCCESS
* The expected hash is identical to the actual hash of the message.
* \retval PSA_ERROR_INVALID_SIGNATURE
* The hash of the message was calculated successfully, but it
* differs from the expected hash.
* \retval PSA_ERROR_BAD_STATE
* The operation state is not valid (not started, or already completed).
* \retval PSA_ERROR_INSUFFICIENT_MEMORY
* \retval PSA_ERROR_COMMUNICATION_FAILURE
* \retval PSA_ERROR_HARDWARE_FAILURE
* \retval PSA_ERROR_TAMPERING_DETECTED
*/
psa_status_t psa_hash_verify(psa_hash_operation_t *operation,
const uint8_t *hash,
size_t hash_length);
/** Abort a hash operation.
*
* This function may be called at any time after psa_hash_start().
* Aborting an operation frees all associated resources except for the
* \c operation structure itself.
*
* Implementation should strive to be robust and handle inactive hash
* operations safely (do nothing and return #PSA_ERROR_BAD_STATE). However,
* application writers should beware that uninitialized memory may happen
* to be indistinguishable from an active hash operation, and the behavior
* of psa_hash_abort() is undefined in this case.
*
* \param operation Active hash operation.
*
* \retval PSA_SUCCESS
* \retval PSA_ERROR_BAD_STATE
* \c operation is not an active hash operation.
* \retval PSA_ERROR_COMMUNICATION_FAILURE
* \retval PSA_ERROR_HARDWARE_FAILURE
* \retval PSA_ERROR_TAMPERING_DETECTED
*/
psa_status_t psa_hash_abort(psa_hash_operation_t *operation);
/**@}*/
/** \defgroup MAC Message authentication codes
* @{
*/
/** The type of the state data structure for multipart MAC operations.
*
* This is an implementation-defined \c struct. Applications should not
* make any assumptions about the content of this structure except
* as directed by the documentation of a specific implementation. */
typedef struct psa_mac_operation_s psa_mac_operation_t;
/** The size of the output of psa_mac_finish(), in bytes.
*
* This is also the MAC size that psa_mac_verify() expects.
*
* \param alg A MAC algorithm (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_MAC(alg) is true).
*
* \return The MAC size for the specified algorithm.
* If the MAC algorithm is not recognized, return 0.
* An implementation may return either 0 or the correct size
* for a MAC algorithm that it recognizes, but does not support.
*/
#define PSA_MAC_FINAL_SIZE(key_type, key_bits, alg) \
(PSA_ALG_IS_HMAC(alg) ? PSA_HASH_FINAL_SIZE(PSA_ALG_HMAC_HASH(alg)) : \
PSA_ALG_IS_BLOCK_CIPHER_MAC(alg) ? PSA_BLOCK_CIPHER_BLOCK_SIZE(key_type) : \
0)
/** Start a multipart MAC operation.
*
* The sequence of operations to calculate a MAC (message authentication code)
* is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Call psa_mac_start() to specify the algorithm and key.
* The key remains associated with the operation even if the content
* of the key slot changes.
* -# Call psa_mac_update() zero, one or more times, passing a fragment
* of the message each time. The MAC that is calculated is the MAC
* of the concatenation of these messages in order.
* -# To calculate the MAC, call psa_mac_finish().
* To compare the MAC with an expected value, call psa_mac_verify().
*
* The application may call psa_mac_abort() at any time after the operation
* has been initialized with psa_mac_start().
*
* After a successful call to psa_mac_start(), the application must
* eventually destroy the operation through one of the following means:
* - A failed call to psa_mac_update().
* - A call to psa_mac_final(), psa_mac_verify() or psa_mac_abort().
*
* \param operation
* \param alg The MAC algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_MAC(alg) is true).
*
* \retval PSA_SUCCESS
* Success.
* \retval PSA_ERROR_EMPTY_SLOT
* \retval PSA_ERROR_NOT_PERMITTED
* \retval PSA_ERROR_INVALID_ARGUMENT
* \c key is not compatible with \c alg.
* \retval PSA_ERROR_NOT_SUPPORTED
* \c alg is not supported or is not a MAC algorithm.
* \retval PSA_ERROR_INSUFFICIENT_MEMORY
* \retval PSA_ERROR_COMMUNICATION_FAILURE
* \retval PSA_ERROR_HARDWARE_FAILURE
* \retval PSA_ERROR_TAMPERING_DETECTED
*/
psa_status_t psa_mac_start(psa_mac_operation_t *operation,
psa_key_slot_t key,
psa_algorithm_t alg);
psa_status_t psa_mac_update(psa_mac_operation_t *operation,
const uint8_t *input,
size_t input_length);
psa_status_t psa_mac_finish(psa_mac_operation_t *operation,
uint8_t *mac,
size_t mac_size,
size_t *mac_length);
psa_status_t psa_mac_verify(psa_mac_operation_t *operation,
const uint8_t *mac,
size_t mac_length);
psa_status_t psa_mac_abort(psa_mac_operation_t *operation);
/**@}*/
/** \defgroup cipher Symmetric ciphers
* @{
*/
/** The type of the state data structure for multipart cipher operations.
*
* This is an implementation-defined \c struct. Applications should not
* make any assumptions about the content of this structure except
* as directed by the documentation of a specific implementation. */
typedef struct psa_cipher_operation_s psa_cipher_operation_t;
/** Set the key for a multipart symmetric encryption operation.
*
* The sequence of operations to encrypt a message with a symmetric cipher
* is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Call psa_encrypt_setup() to specify the algorithm and key.
* The key remains associated with the operation even if the content
* of the key slot changes.
* -# Call either psa_encrypt_generate_iv() or psa_encrypt_set_iv() to
* generate or set the IV (initialization vector). You should use
* psa_encrypt_generate_iv() unless the protocol you are implementing
* requires a specific IV value.
* -# Call psa_cipher_update() zero, one or more times, passing a fragment
* of the message each time.
* -# Call psa_cipher_finish().
*
* The application may call psa_cipher_abort() at any time after the operation
* has been initialized with psa_encrypt_setup().
*
* After a successful call to psa_encrypt_setup(), the application must
* eventually destroy the operation through one of the following means:
* - A failed call to psa_encrypt_generate_iv(), psa_encrypt_set_iv()
* or psa_cipher_update().
* - A call to psa_cipher_final() or psa_cipher_abort().
*
* \param operation
* \param alg The cipher algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_CIPHER(alg) is true).
*
* \retval PSA_SUCCESS
* Success.
* \retval PSA_ERROR_EMPTY_SLOT
* \retval PSA_ERROR_NOT_PERMITTED
* \retval PSA_ERROR_INVALID_ARGUMENT
* \c key is not compatible with \c alg.
* \retval PSA_ERROR_NOT_SUPPORTED
* \c alg is not supported or is not a cipher algorithm.
* \retval PSA_ERROR_INSUFFICIENT_MEMORY
* \retval PSA_ERROR_COMMUNICATION_FAILURE
* \retval PSA_ERROR_HARDWARE_FAILURE
* \retval PSA_ERROR_TAMPERING_DETECTED
*/
psa_status_t psa_encrypt_setup(psa_cipher_operation_t *operation,
psa_key_slot_t key,
psa_algorithm_t alg);
/** Set the key for a multipart symmetric decryption operation.
*
* The sequence of operations to decrypt a message with a symmetric cipher
* is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Call psa_decrypt_setup() to specify the algorithm and key.
* The key remains associated with the operation even if the content
* of the key slot changes.
* -# Call psa_cipher_update() with the IV (initialization vector) for the
* decryption. If the IV is prepended to the ciphertext, you can call
* psa_cipher_update() on a buffer containing the IV followed by the
* beginning of the message.
* -# Call psa_cipher_update() zero, one or more times, passing a fragment
* of the message each time.
* -# Call psa_cipher_finish().
*
* The application may call psa_cipher_abort() at any time after the operation
* has been initialized with psa_encrypt_setup().
*
* After a successful call to psa_decrypt_setup(), the application must
* eventually destroy the operation through one of the following means:
* - A failed call to psa_cipher_update().
* - A call to psa_cipher_final() or psa_cipher_abort().
*
* \param operation
* \param alg The cipher algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_CIPHER(alg) is true).
*
* \retval PSA_SUCCESS
* Success.
* \retval PSA_ERROR_EMPTY_SLOT
* \retval PSA_ERROR_NOT_PERMITTED
* \retval PSA_ERROR_INVALID_ARGUMENT
* \c key is not compatible with \c alg.
* \retval PSA_ERROR_NOT_SUPPORTED
* \c alg is not supported or is not a cipher algorithm.
* \retval PSA_ERROR_INSUFFICIENT_MEMORY
* \retval PSA_ERROR_COMMUNICATION_FAILURE
* \retval PSA_ERROR_HARDWARE_FAILURE
* \retval PSA_ERROR_TAMPERING_DETECTED
*/
psa_status_t psa_decrypt_setup(psa_cipher_operation_t *operation,
psa_key_slot_t key,
psa_algorithm_t alg);
psa_status_t psa_encrypt_generate_iv(psa_cipher_operation_t *operation,
unsigned char *iv,
size_t iv_size,
size_t *iv_length);
psa_status_t psa_encrypt_set_iv(psa_cipher_operation_t *operation,
const unsigned char *iv,
size_t iv_length);
psa_status_t psa_cipher_update(psa_cipher_operation_t *operation,
const uint8_t *input,
size_t input_length);
psa_status_t psa_cipher_finish(psa_cipher_operation_t *operation,
uint8_t *mac,
size_t mac_size,
size_t *mac_length);
psa_status_t psa_cipher_abort(psa_cipher_operation_t *operation);
/**@}*/
/** \defgroup aead Authenticated encryption with associated data (AEAD)
* @{
*/
/** The type of the state data structure for multipart AEAD operations.
*
* This is an implementation-defined \c struct. Applications should not
* make any assumptions about the content of this structure except
* as directed by the documentation of a specific implementation. */
typedef struct psa_aead_operation_s psa_aead_operation_t;
/** Set the key for a multipart authenticated encryption operation.
*
* The sequence of operations to authenticate-and-encrypt a message
* is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Call psa_aead_encrypt_setup() to specify the algorithm and key.
* The key remains associated with the operation even if the content
* of the key slot changes.
* -# Call either psa_aead_generate_iv() or psa_aead_set_iv() to
* generate or set the IV (initialization vector). You should use
* psa_encrypt_generate_iv() unless the protocol you are implementing
* requires a specific IV value.
* -# Call psa_aead_update_ad() to pass the associated data that is
* to be authenticated but not encrypted. You may omit this step if
* there is no associated data.
* -# Call psa_aead_update() zero, one or more times, passing a fragment
* of the data to encrypt each time.
* -# Call psa_aead_finish().
*
* The application may call psa_aead_abort() at any time after the operation
* has been initialized with psa_aead_encrypt_setup().
*
* After a successful call to psa_aead_setup(), the application must
* eventually destroy the operation through one of the following means:
* - A failed call to psa_aead_generate_iv(), psa_aead_set_iv(),
* psa_aead_update_ad() or psa_aead_update().
* - A call to psa_aead_final() or psa_aead_abort().
*
* \param operation
* \param alg The AEAD algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_AEAD(alg) is true).
*
* \retval PSA_SUCCESS
* Success.
* \retval PSA_ERROR_EMPTY_SLOT
* \retval PSA_ERROR_NOT_PERMITTED
* \retval PSA_ERROR_INVALID_ARGUMENT
* \c key is not compatible with \c alg.
* \retval PSA_ERROR_NOT_SUPPORTED
* \c alg is not supported or is not an AEAD algorithm.
* \retval PSA_ERROR_INSUFFICIENT_MEMORY
* \retval PSA_ERROR_COMMUNICATION_FAILURE
* \retval PSA_ERROR_HARDWARE_FAILURE
* \retval PSA_ERROR_TAMPERING_DETECTED
*/
psa_status_t psa_aead_encrypt_setup(psa_aead_operation_t *operation,
psa_key_slot_t key,
psa_algorithm_t alg);
/** Set the key for a multipart authenticated decryption operation.
*
* The sequence of operations to authenticated and decrypt a message
* is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Call psa_aead_decrypt_setup() to specify the algorithm and key.
* The key remains associated with the operation even if the content
* of the key slot changes.
* -# Call psa_aead_set_iv() to pass the initialization vector (IV)
* for the authenticated decryption.
* -# Call psa_aead_update_ad() to pass the associated data that is
* to be authenticated but not encrypted. You may omit this step if
* there is no associated data.
* -# Call psa_aead_update() zero, one or more times, passing a fragment
* of the data to decrypt each time.
* -# Call psa_aead_finish().
*
* The application may call psa_aead_abort() at any time after the operation
* has been initialized with psa_aead_decrypt_setup().
*
* After a successful call to psa_decrypt_setup(), the application must
* eventually destroy the operation through one of the following means:
* - A failed call to psa_aead_update().
* - A call to psa_cipher_final() or psa_cipher_abort().
*
* \param operation
* \param alg The cipher algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_CIPHER(alg) is true).
*
* \retval PSA_SUCCESS
* Success.
* \retval PSA_ERROR_EMPTY_SLOT
* \retval PSA_ERROR_NOT_PERMITTED
* \retval PSA_ERROR_INVALID_ARGUMENT
* \c key is not compatible with \c alg.
* \retval PSA_ERROR_NOT_SUPPORTED
* \c alg is not supported or is not a cipher algorithm.
* \retval PSA_ERROR_INSUFFICIENT_MEMORY
* \retval PSA_ERROR_COMMUNICATION_FAILURE
* \retval PSA_ERROR_HARDWARE_FAILURE
* \retval PSA_ERROR_TAMPERING_DETECTED
*/
psa_status_t psa_aead_decrypt_setup(psa_aead_operation_t *operation,
psa_key_slot_t key,
psa_algorithm_t alg);
psa_status_t psa_aead_generate_iv(psa_aead_operation_t *operation,
unsigned char *iv,
size_t iv_size,
size_t *iv_length);
psa_status_t psa_aead_set_iv(psa_aead_operation_t *operation,
const unsigned char *iv,
size_t iv_length);
psa_status_t psa_aead_update_ad(psa_aead_operation_t *operation,
const uint8_t *input,
size_t input_length);
psa_status_t psa_aead_update(psa_aead_operation_t *operation,
const uint8_t *input,
size_t input_length);
psa_status_t psa_aead_finish(psa_aead_operation_t *operation,
uint8_t *tag,
size_t tag_size,
size_t *tag_length);
psa_status_t psa_aead_verify(psa_aead_operation_t *operation,
uint8_t *tag,
size_t tag_length);
psa_status_t psa_aead_abort(psa_aead_operation_t *operation);
/**@}*/
/** \defgroup asymmetric Asymmetric cryptography
* @{
*/
/**
* \brief Maximum ECDSA signature size for a given curve bit size
*
* \param curve_bits Curve size in bits
* \return Maximum signature size in bytes
*
* \note This macro returns a compile-time constant if its argument is one.
*
* \warning This macro may evaluate its argument multiple times.
*/
/*
* RFC 4492 page 20:
*
* Ecdsa-Sig-Value ::= SEQUENCE {
* r INTEGER,
* s INTEGER
* }
*
* Size is at most
* 1 (tag) + 1 (len) + 1 (initial 0) + curve_bytes for each of r and s,
* twice that + 1 (tag) + 2 (len) for the sequence
* (assuming curve_bytes is less than 126 for r and s,
* and less than 124 (total len <= 255) for the sequence)
*/
#define PSA_ECDSA_SIGNATURE_SIZE(curve_bits) \
( /*T,L of SEQUENCE*/ ((curve_bits) >= 61 * 8 ? 3 : 2) + \
/*T,L of r,s*/ 2 * (((curve_bits) >= 127 * 8 ? 3 : 2) + \
/*V of r,s*/ ((curve_bits) + 8) / 8))
/** Safe signature buffer size for psa_asymmetric_sign().
*
* This macro returns a safe 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_asymmetric_sign() will not fail with
* #PSA_ERROR_BUFFER_TOO_SMALL.
* If the parameters are a valid combination that is not supported
* by the implementation, this macro either shall return either a
* sensible size or 0.
* If the parameters are not valid, the
* return value is unspecified.
*
*/
#define PSA_ASYMMETRIC_SIGN_OUTPUT_SIZE(key_type, key_bits, alg) \
(PSA_KEY_TYPE_IS_RSA(key_type) ? ((void)alg, PSA_BITS_TO_BYTES(key_bits)) : \
PSA_KEY_TYPE_IS_ECC(key_type) ? PSA_ECDSA_SIGNATURE_SIZE(key_bits) : \
0)
/**
* \brief Sign a hash or short message with a private key.
*
* \param key Key slot containing an asymmetric key pair.
* \param alg A signature algorithm that is compatible with
* the type of \c key.
* \param hash The message to sign.
* \param hash_length Size of the \c hash buffer in bytes.
* \param salt A salt or label, if supported by the signature
* algorithm.
* If the signature algorithm does not support a
* salt, pass \c NULL.
* If the signature algorithm supports an optional
* salt and you do not want to pass a salt,
* pass \c NULL.
* \param salt_length Size of the \c salt buffer in bytes.
* If \c salt is \c NULL, pass 0.
* \param signature Buffer where the signature is to be written.
* \param signature_size Size of the \c signature buffer in bytes.
* \param signature_length On success, the number of bytes
* that make up the returned signature value.
* This is at most #PSA_HASH_FINAL_SIZE(alg)
* (note that it may be less).
*
* \retval PSA_SUCCESS
* \retval PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \c signature buffer is too small. You can
* determine a sufficient buffer size by calling
* #PSA_ASYMMETRIC_SIGN_OUTPUT_SIZE(key_type, key_bits, alg)
* where \c key_type and \c key_bits are the type and bit-size
* respectively of \c key.
* \retval PSA_ERROR_NOT_SUPPORTED
* \retval PSA_ERROR_INVALID_ARGUMENT
* \retval PSA_ERROR_INSUFFICIENT_MEMORY
* \retval PSA_ERROR_COMMUNICATION_FAILURE
* \retval PSA_ERROR_HARDWARE_FAILURE
* \retval PSA_ERROR_TAMPERING_DETECTED
* \retval PSA_ERROR_INSUFFICIENT_ENTROPY
*/
psa_status_t psa_asymmetric_sign(psa_key_slot_t key,
psa_algorithm_t alg,
const uint8_t *hash,
size_t hash_length,
const uint8_t *salt,
size_t salt_length,
uint8_t *signature,
size_t signature_size,
size_t *signature_length);
/**
* \brief Verify the signature a hash or short message using a public key.
*
* \param key Key slot containing a public key or an
* asymmetric key pair.
* \param alg A signature algorithm that is compatible with
* the type of \c key.
* \param hash The message whose signature is to be verified.
* \param hash_length Size of the \c hash buffer in bytes.
* \param salt A salt or label, if supported by the signature
* algorithm.
* If the signature algorithm does not support a
* salt, pass \c NULL.
* If the signature algorithm supports an optional
* salt and you do not want to pass a salt,
* pass \c NULL.
* \param salt_length Size of the \c salt buffer in bytes.
* If \c salt is \c NULL, pass 0.
* \param signature Buffer containing the signature to verify.
* \param signature_size Size of the \c signature buffer in bytes.
*
* \retval PSA_SUCCESS
* The signature is valid.
* \retval PSA_ERROR_INVALID_SIGNATURE
* The calculation was perfomed successfully, but the passed
* signature is not a valid signature.
* \retval PSA_ERROR_NOT_SUPPORTED
* \retval PSA_ERROR_INVALID_ARGUMENT
* \retval PSA_ERROR_INSUFFICIENT_MEMORY
* \retval PSA_ERROR_COMMUNICATION_FAILURE
* \retval PSA_ERROR_HARDWARE_FAILURE
* \retval PSA_ERROR_TAMPERING_DETECTED
*/
psa_status_t psa_asymmetric_verify(psa_key_slot_t key,
psa_algorithm_t alg,
const uint8_t *hash,
size_t hash_length,
const uint8_t *salt,
size_t salt_length,
uint8_t *signature,
size_t signature_size);
/**@}*/
#ifdef __cplusplus
}
#endif
/* The file "crypto_struct.h" contains definitions for
* implementation-specific structs that are declared above. */
#include "crypto_struct.h"
/* The file "crypto_extra.h" contains vendor-specific definitions. This
* can include vendor-defined algorithms, extra functions, etc. */
#include "crypto_extra.h"
#endif /* PSA_CRYPTO_H */
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