Group asymmetric

group asymmetric

Functions

psa_status_t psa_sign_message(mbedtls_svc_key_id_t key, psa_algorithm_t alg, const uint8_t *input, size_t input_length, uint8_t *signature, size_t signature_size, size_t *signature_length)

Sign a message with a private key. For hash-and-sign algorithms, this includes the hashing step.

Note

To perform a multi-part hash-and-sign signature algorithm, first use a multi-part hash operation and then pass the resulting hash to psa_sign_hash(). PSA_ALG_GET_HASH(alg) can be used to determine the hash algorithm to use.

Parameters:

  • key – [in] Identifier of the key to use for the operation. It must be an asymmetric key pair. The key must allow the usage PSA_KEY_USAGE_SIGN_MESSAGE.

  • alg – [in] An asymmetric signature algorithm (PSA_ALG_XXX value such that PSA_ALG_IS_SIGN_MESSAGE(alg) is true), that is compatible with the type of key.

  • input – [in] The input message to sign.

  • input_length – [in] Size of the input buffer in bytes.

  • signature – [out] Buffer where the signature is to be written.

  • signature_size – [in] Size of the signature buffer in bytes. This must be appropriate for the selected algorithm and key:

    • The required signature size is PSA_SIGN_OUTPUT_SIZE(key_type, key_bits, alg) where key_type and key_bits are the type and bit-size respectively of key.

    • PSA_SIGNATURE_MAX_SIZE evaluates to the maximum signature size of any supported signature algorithm.

  • signature_length – [out] On success, the number of bytes that make up the returned signature value.

Return values:

  • PSA_SUCCESS –

  • PSA_ERROR_INVALID_HANDLE –

  • PSA_ERROR_NOT_PERMITTED – The key does not have the PSA_KEY_USAGE_SIGN_MESSAGE flag, or it does not permit the requested algorithm.

  • PSA_ERROR_BUFFER_TOO_SMALL – The size of the signature buffer is too small. You can determine a sufficient buffer size by calling PSA_SIGN_OUTPUT_SIZE(key_type, key_bits, alg) where key_type and key_bits are the type and bit-size respectively of key.

  • PSA_ERROR_NOT_SUPPORTED –

  • PSA_ERROR_INVALID_ARGUMENT –

  • PSA_ERROR_INSUFFICIENT_MEMORY –

  • PSA_ERROR_COMMUNICATION_FAILURE –

  • PSA_ERROR_HARDWARE_FAILURE –

  • PSA_ERROR_CORRUPTION_DETECTED –

  • PSA_ERROR_STORAGE_FAILURE –

  • PSA_ERROR_DATA_CORRUPT –

  • PSA_ERROR_DATA_INVALID –

  • PSA_ERROR_INSUFFICIENT_ENTROPY –

  • PSA_ERROR_BAD_STATE – The library has not been previously initialized by psa_crypto_init(). It is implementation-dependent whether a failure to initialize results in this error code.

psa_status_t psa_verify_message(mbedtls_svc_key_id_t key, psa_algorithm_t alg, const uint8_t *input, size_t input_length, const uint8_t *signature, size_t signature_length)

Verify the signature of a message with a public key, using a hash-and-sign verification algorithm.

Note

To perform a multi-part hash-and-sign signature verification algorithm, first use a multi-part hash operation to hash the message and then pass the resulting hash to psa_verify_hash(). PSA_ALG_GET_HASH(alg) can be used to determine the hash algorithm to use.

Parameters:

  • key – [in] Identifier of the key to use for the operation. It must be a public key or an asymmetric key pair. The key must allow the usage PSA_KEY_USAGE_VERIFY_MESSAGE.

  • alg – [in] An asymmetric signature algorithm (PSA_ALG_XXX value such that PSA_ALG_IS_SIGN_MESSAGE(alg) is true), that is compatible with the type of key.

  • input – [in] The message whose signature is to be verified.

  • input_length – [in] Size of the input buffer in bytes.

  • signature – [in] Buffer containing the signature to verify.

  • signature_length – [in] Size of the signature buffer in bytes.

Return values:

  • PSA_SUCCESS –

  • PSA_ERROR_INVALID_HANDLE –

  • PSA_ERROR_NOT_PERMITTED – The key does not have the PSA_KEY_USAGE_SIGN_MESSAGE flag, or it does not permit the requested algorithm.

  • PSA_ERROR_INVALID_SIGNATURE – The calculation was performed successfully, but the passed signature is not a valid signature.

  • PSA_ERROR_NOT_SUPPORTED –

  • PSA_ERROR_INVALID_ARGUMENT –

  • PSA_ERROR_INSUFFICIENT_MEMORY –

  • PSA_ERROR_COMMUNICATION_FAILURE –

  • PSA_ERROR_HARDWARE_FAILURE –

  • PSA_ERROR_CORRUPTION_DETECTED –

  • PSA_ERROR_STORAGE_FAILURE –

  • PSA_ERROR_DATA_CORRUPT –

  • PSA_ERROR_DATA_INVALID –

  • PSA_ERROR_BAD_STATE – The library has not been previously initialized by psa_crypto_init(). It is implementation-dependent whether a failure to initialize results in this error code.

psa_status_t psa_sign_hash(mbedtls_svc_key_id_t key, psa_algorithm_t alg, const uint8_t *hash, size_t hash_length, uint8_t *signature, size_t signature_size, size_t *signature_length)

Sign a hash or short message with a private key.

Note that to perform a hash-and-sign signature algorithm, you must first calculate the hash by calling psa_hash_setup(), psa_hash_update() and psa_hash_finish(), or alternatively by calling psa_hash_compute(). Then pass the resulting hash as the hash parameter to this function. You can use PSA_ALG_SIGN_GET_HASH(alg) to determine the hash algorithm to use.

Parameters:

  • key – Identifier of the key to use for the operation. It must be an asymmetric key pair. The key must allow the usage PSA_KEY_USAGE_SIGN_HASH.

  • alg – A signature algorithm (PSA_ALG_XXX value such that PSA_ALG_IS_SIGN_HASH(alg) is true), that is compatible with the type of key.

  • hash – [in] The hash or message to sign.

  • hash_length – Size of the hash buffer in bytes.

  • signature – [out] Buffer where the signature is to be written.

  • signature_size – Size of the signature buffer in bytes.

  • signature_length – [out] On success, the number of bytes that make up the returned signature value.

Return values:

  • PSA_SUCCESS –

  • PSA_ERROR_INVALID_HANDLE –

  • PSA_ERROR_NOT_PERMITTED –

  • PSA_ERROR_BUFFER_TOO_SMALL – The size of the signature buffer is too small. You can determine a sufficient buffer size by calling PSA_SIGN_OUTPUT_SIZE(key_type, key_bits, alg) where key_type and key_bits are the type and bit-size respectively of key.

  • PSA_ERROR_NOT_SUPPORTED –

  • PSA_ERROR_INVALID_ARGUMENT –

  • PSA_ERROR_INSUFFICIENT_MEMORY –

  • PSA_ERROR_COMMUNICATION_FAILURE –

  • PSA_ERROR_HARDWARE_FAILURE –

  • PSA_ERROR_CORRUPTION_DETECTED –

  • PSA_ERROR_STORAGE_FAILURE –

  • PSA_ERROR_INSUFFICIENT_ENTROPY –

  • PSA_ERROR_BAD_STATE – The library has not been previously initialized by psa_crypto_init(). It is implementation-dependent whether a failure to initialize results in this error code.

psa_status_t psa_verify_hash(mbedtls_svc_key_id_t key, psa_algorithm_t alg, const uint8_t *hash, size_t hash_length, const uint8_t *signature, size_t signature_length)

Verify the signature of a hash or short message using a public key.

Note that to perform a hash-and-sign signature algorithm, you must first calculate the hash by calling psa_hash_setup(), psa_hash_update() and psa_hash_finish(), or alternatively by calling psa_hash_compute(). Then pass the resulting hash as the hash parameter to this function. You can use PSA_ALG_SIGN_GET_HASH(alg) to determine the hash algorithm to use.

Parameters:

  • key – Identifier of the key to use for the operation. It must be a public key or an asymmetric key pair. The key must allow the usage PSA_KEY_USAGE_VERIFY_HASH.

  • alg – A signature algorithm (PSA_ALG_XXX value such that PSA_ALG_IS_SIGN_HASH(alg) is true), that is compatible with the type of key.

  • hash – [in] The hash or message whose signature is to be verified.

  • hash_length – Size of the hash buffer in bytes.

  • signature – [in] Buffer containing the signature to verify.

  • signature_length – Size of the signature buffer in bytes.

Return values:

  • PSA_SUCCESS – The signature is valid.

  • PSA_ERROR_INVALID_HANDLE –

  • PSA_ERROR_NOT_PERMITTED –

  • PSA_ERROR_INVALID_SIGNATURE – The calculation was performed successfully, but the passed signature is not a valid signature.

  • PSA_ERROR_NOT_SUPPORTED –

  • PSA_ERROR_INVALID_ARGUMENT –

  • PSA_ERROR_INSUFFICIENT_MEMORY –

  • PSA_ERROR_COMMUNICATION_FAILURE –

  • PSA_ERROR_HARDWARE_FAILURE –

  • PSA_ERROR_CORRUPTION_DETECTED –

  • PSA_ERROR_STORAGE_FAILURE –

  • PSA_ERROR_BAD_STATE – The library has not been previously initialized by psa_crypto_init(). It is implementation-dependent whether a failure to initialize results in this error code.

psa_status_t psa_asymmetric_encrypt(mbedtls_svc_key_id_t key, psa_algorithm_t alg, const uint8_t *input, size_t input_length, const uint8_t *salt, size_t salt_length, uint8_t *output, size_t output_size, size_t *output_length)

Encrypt a short message with a public key.

Parameters:

  • salt_length – Size of the salt buffer in bytes. If salt is NULL, pass 0.

  • output – [out] Buffer where the encrypted message is to be written.

  • output_size – Size of the output buffer in bytes.

  • output_length – [out] On success, the number of bytes that make up the returned output.

  • key – Identifier of the key to use for the operation. It must be a public key or an asymmetric key pair. It must allow the usage PSA_KEY_USAGE_ENCRYPT.

  • alg – An asymmetric encryption algorithm that is compatible with the type of key.

  • input – [in] The message to encrypt.

  • input_length – Size of the input buffer in bytes.

  • salt – [in] A salt or label, if supported by the encryption algorithm. If the algorithm does not support a salt, pass NULL. If the algorithm supports an optional salt and you do not want to pass a salt, pass NULL.

Return values:

  • PSA_SUCCESS –

  • PSA_ERROR_INVALID_HANDLE –

  • PSA_ERROR_NOT_PERMITTED –

  • PSA_ERROR_BUFFER_TOO_SMALL – The size of the output buffer is too small. You can determine a sufficient buffer size by calling PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE(key_type, key_bits, alg) where key_type and key_bits are the type and bit-size respectively of key.

  • PSA_ERROR_NOT_SUPPORTED –

  • PSA_ERROR_INVALID_ARGUMENT –

  • PSA_ERROR_INSUFFICIENT_MEMORY –

  • PSA_ERROR_COMMUNICATION_FAILURE –

  • PSA_ERROR_HARDWARE_FAILURE –

  • PSA_ERROR_CORRUPTION_DETECTED –

  • PSA_ERROR_STORAGE_FAILURE –

  • PSA_ERROR_INSUFFICIENT_ENTROPY –

  • PSA_ERROR_BAD_STATE – The library has not been previously initialized by psa_crypto_init(). It is implementation-dependent whether a failure to initialize results in this error code.

psa_status_t psa_asymmetric_decrypt(mbedtls_svc_key_id_t key, psa_algorithm_t alg, const uint8_t *input, size_t input_length, const uint8_t *salt, size_t salt_length, uint8_t *output, size_t output_size, size_t *output_length)

Decrypt a short message with a private key.

Parameters:

  • salt_length – Size of the salt buffer in bytes. If salt is NULL, pass 0.

  • output – [out] Buffer where the decrypted message is to be written.

  • output_size – Size of the output buffer in bytes.

  • output_length – [out] On success, the number of bytes that make up the returned output.

  • key – Identifier of the key to use for the operation. It must be an asymmetric key pair. It must allow the usage PSA_KEY_USAGE_DECRYPT.

  • alg – An asymmetric encryption algorithm that is compatible with the type of key.

  • input – [in] The message to decrypt.

  • input_length – Size of the input buffer in bytes.

  • salt – [in] A salt or label, if supported by the encryption algorithm. If the algorithm does not support a salt, pass NULL. If the algorithm supports an optional salt and you do not want to pass a salt, pass NULL.

Return values:

  • PSA_SUCCESS –

  • PSA_ERROR_INVALID_HANDLE –

  • PSA_ERROR_NOT_PERMITTED –

  • PSA_ERROR_BUFFER_TOO_SMALL – The size of the output buffer is too small. You can determine a sufficient buffer size by calling PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE(key_type, key_bits, alg) where key_type and key_bits are the type and bit-size respectively of key.

  • PSA_ERROR_NOT_SUPPORTED –

  • PSA_ERROR_INVALID_ARGUMENT –

  • PSA_ERROR_INSUFFICIENT_MEMORY –

  • PSA_ERROR_COMMUNICATION_FAILURE –

  • PSA_ERROR_HARDWARE_FAILURE –

  • PSA_ERROR_CORRUPTION_DETECTED –

  • PSA_ERROR_STORAGE_FAILURE –

  • PSA_ERROR_INSUFFICIENT_ENTROPY –

  • PSA_ERROR_INVALID_PADDING –

  • PSA_ERROR_BAD_STATE – The library has not been previously initialized by psa_crypto_init(). It is implementation-dependent whether a failure to initialize results in this error code.