File pk.h

Public Key abstraction layer.

Defines

MBEDTLS_ERR_PK_ALLOC_FAILED: Memory allocation failed.

MBEDTLS_ERR_PK_TYPE_MISMATCH: Type mismatch, eg attempt to encrypt with an ECDSA key

MBEDTLS_ERR_PK_BAD_INPUT_DATA: Bad input parameters to function.

MBEDTLS_ERR_PK_FILE_IO_ERROR: Read/write of file failed.

MBEDTLS_ERR_PK_KEY_INVALID_VERSION: Unsupported key version

MBEDTLS_ERR_PK_KEY_INVALID_FORMAT: Invalid key tag or value.

MBEDTLS_ERR_PK_UNKNOWN_PK_ALG: Key algorithm is unsupported (only RSA and EC are supported).

MBEDTLS_ERR_PK_PASSWORD_REQUIRED: Private key password can’t be empty.

MBEDTLS_ERR_PK_PASSWORD_MISMATCH: Given private key password does not allow for correct decryption.

MBEDTLS_ERR_PK_INVALID_PUBKEY: The pubkey tag or value is invalid (only RSA and EC are supported).

MBEDTLS_ERR_PK_INVALID_ALG: The algorithm tag or value is invalid.

MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE: Elliptic curve is unsupported (only NIST curves are supported).

MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE: Unavailable feature, e.g. RSA disabled for RSA key.

MBEDTLS_ERR_PK_SIG_LEN_MISMATCH: The buffer contains a valid signature followed by more data.

MBEDTLS_ERR_PK_HW_ACCEL_FAILED: PK hardware accelerator failed.

MBEDTLS_PK_SIGNATURE_MAX_SIZE: Maximum size of a signature made by mbedtls_pk_sign().

MBEDTLS_PK_SIGNATURE_MAX_SIZE: Maximum size of a signature made by mbedtls_pk_sign().

MBEDTLS_PK_DEBUG_MAX_ITEMS: Maximum number of item send for debugging, plus 1

Typedefs

typedef struct mbedtls_pk_rsassa_pss_options mbedtls_pk_rsassa_pss_options: Options for RSASSA-PSS signature verification. See mbedtls_rsa_rsassa_pss_verify_ext()

typedef struct mbedtls_pk_debug_item mbedtls_pk_debug_item: Item to send to the debug module.

typedef struct mbedtls_pk_info_t mbedtls_pk_info_t: Public key information and operations.

typedef struct mbedtls_pk_context mbedtls_pk_context: Public key container.

typedef int (*mbedtls_pk_rsa_alt_decrypt_func)(void *ctx, int mode, size_t *olen, const unsigned char *input, unsigned char *output, size_t output_max_len): Types for RSA-alt abstraction.

typedef int (*mbedtls_pk_rsa_alt_sign_func)(void *ctx, int (*f_rng)(void*, unsigned char*, size_t), void *p_rng, int mode, mbedtls_md_type_t md_alg, unsigned int hashlen, const unsigned char *hash, unsigned char *sig)

typedef size_t (*mbedtls_pk_rsa_alt_key_len_func)(void *ctx)

Enums

enum mbedtls_pk_type_t

Public key types.

Values:

enumerator MBEDTLS_PK_NONE

enumerator MBEDTLS_PK_RSA

enumerator MBEDTLS_PK_ECKEY

enumerator MBEDTLS_PK_ECKEY_DH

enumerator MBEDTLS_PK_ECDSA

enumerator MBEDTLS_PK_RSA_ALT

enumerator MBEDTLS_PK_RSASSA_PSS

enumerator MBEDTLS_PK_OPAQUE

enum mbedtls_pk_debug_type

Types for interfacing with the debug module.

Values:

enumerator MBEDTLS_PK_DEBUG_NONE

enumerator MBEDTLS_PK_DEBUG_MPI

enumerator MBEDTLS_PK_DEBUG_ECP

Functions

const mbedtls_pk_info_t *mbedtls_pk_info_from_type(mbedtls_pk_type_t pk_type)

Return information associated with the given PK type.

Parameters: pk_type – PK type to search for.
Returns: The PK info associated with the type or NULL if not found.

void mbedtls_pk_init(mbedtls_pk_context *ctx)

Initialize a mbedtls_pk_context (as NONE).

Parameters: ctx – The context to initialize. This must not be NULL.

void mbedtls_pk_free(mbedtls_pk_context *ctx)

Free the components of a mbedtls_pk_context.

Note

For contexts that have been set up with mbedtls_pk_setup_opaque(), this does not free the underlying PSA key and you still need to call psa_destroy_key() independently if you want to destroy that key.

Parameters: ctx – The context to clear. It must have been initialized. If this is NULL, this function does nothing.

void mbedtls_pk_restart_init(mbedtls_pk_restart_ctx *ctx)

Initialize a restart context.

Parameters: ctx – The context to initialize. This must not be NULL.

void mbedtls_pk_restart_free(mbedtls_pk_restart_ctx *ctx)

Free the components of a restart context.

Parameters: ctx – The context to clear. It must have been initialized. If this is NULL, this function does nothing.

int mbedtls_pk_setup(mbedtls_pk_context *ctx, const mbedtls_pk_info_t *info)

Initialize a PK context with the information given and allocates the type-specific PK subcontext.

Note

For contexts holding an RSA-alt key, use mbedtls_pk_setup_rsa_alt() instead.

Parameters

ctx – Context to initialize. It must not have been set up yet (type MBEDTLS_PK_NONE).
info – Information to use

Returns

0 on success, MBEDTLS_ERR_PK_BAD_INPUT_DATA on invalid input, MBEDTLS_ERR_PK_ALLOC_FAILED on allocation failure.

int mbedtls_pk_setup_opaque(mbedtls_pk_context *ctx, const psa_key_id_t key)

Initialize a PK context to wrap a PSA key.

Note

This function replaces mbedtls_pk_setup() for contexts that wrap a (possibly opaque) PSA key instead of storing and manipulating the key material directly.

Note

The wrapped key must remain valid as long as the wrapping PK context is in use, that is at least between the point this function is called and the point mbedtls_pk_free() is called on this context. The wrapped key might then be independently used or destroyed.

Note

This function is currently only available for ECC key pairs (that is, ECC keys containing private key material). Support for other key types may be added later.

Parameters

ctx – The context to initialize. It must be empty (type NONE).
key – The PSA key to wrap, which must hold an ECC key pair (see notes below).

Returns

0 on success.

Returns

MBEDTLS_ERR_PK_BAD_INPUT_DATA on invalid input (context already used, invalid key identifier).

Returns

MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE if the key is not an ECC key pair.

Returns

MBEDTLS_ERR_PK_ALLOC_FAILED on allocation failure.

int mbedtls_pk_setup_rsa_alt(mbedtls_pk_context *ctx, void *key, mbedtls_pk_rsa_alt_decrypt_func decrypt_func, mbedtls_pk_rsa_alt_sign_func sign_func, mbedtls_pk_rsa_alt_key_len_func key_len_func)

Initialize an RSA-alt context.

Note

This function replaces mbedtls_pk_setup() for RSA-alt.

Parameters

ctx – Context to initialize. It must not have been set up yet (type MBEDTLS_PK_NONE).
key – RSA key pointer
decrypt_func – Decryption function
sign_func – Signing function
key_len_func – Function returning key length in bytes

Returns

0 on success, or MBEDTLS_ERR_PK_BAD_INPUT_DATA if the context wasn’t already initialized as RSA_ALT.

size_t mbedtls_pk_get_bitlen(const mbedtls_pk_context *ctx)

Get the size in bits of the underlying key.

Parameters: ctx – The context to query. It must have been initialized.
Returns: Key size in bits, or 0 on error

static inline size_t mbedtls_pk_get_len(const mbedtls_pk_context *ctx)

Get the length in bytes of the underlying key.

Parameters: ctx – The context to query. It must have been initialized.
Returns: Key length in bytes, or 0 on error

int mbedtls_pk_can_do(const mbedtls_pk_context *ctx, mbedtls_pk_type_t type)

Tell if a context can do the operation given by type.

Parameters

ctx – The context to query. It must have been initialized.
type – The desired type.

Returns

1 if the context can do operations on the given type.

Returns

0 if the context cannot do the operations on the given type. This is always the case for a context that has been initialized but not set up, or that has been cleared with mbedtls_pk_free().

int mbedtls_pk_verify(mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg, const unsigned char *hash, size_t hash_len, const unsigned char *sig, size_t sig_len)

Verify signature (including padding if relevant).

Note

For RSA keys, the default padding type is PKCS#1 v1.5. Use mbedtls_pk_verify_ext( MBEDTLS_PK_RSASSA_PSS, ... ) to verify RSASSA_PSS signatures.

Note

If MBEDTLS_USE_PSA_CRYPTO is enabled, the PSA crypto subsystem must have been initialized by calling psa_crypto_init() before calling this function, if the key might be an ECC (ECDSA) key.

Note

If hash_len is 0, then the length associated with md_alg is used instead, or an error returned if it is invalid.

Note

md_alg may be MBEDTLS_MD_NONE, only if hash_len != 0

Parameters

ctx – The PK context to use. It must have been set up.
md_alg – Hash algorithm used (see notes)
hash – Hash of the message to sign
hash_len – Hash length or 0 (see notes)
sig – Signature to verify
sig_len – Signature length

Returns

0 on success (signature is valid), MBEDTLS_ERR_PK_SIG_LEN_MISMATCH if there is a valid signature in sig but its length is less than sig_len, or a specific error code.

int mbedtls_pk_verify_restartable(mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg, const unsigned char *hash, size_t hash_len, const unsigned char *sig, size_t sig_len, mbedtls_pk_restart_ctx *rs_ctx)

Restartable version of mbedtls_pk_verify()

Note

Performs the same job as mbedtls_pk_verify(), but can return early and restart according to the limit set with mbedtls_ecp_set_max_ops() to reduce blocking for ECC operations. For RSA, same as mbedtls_pk_verify().

Parameters

ctx – The PK context to use. It must have been set up.
md_alg – Hash algorithm used (see notes)
hash – Hash of the message to sign
hash_len – Hash length or 0 (see notes)
sig – Signature to verify
sig_len – Signature length
rs_ctx – Restart context (NULL to disable restart)

Returns

See mbedtls_pk_verify(), or

Returns

MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of operations was reached: see mbedtls_ecp_set_max_ops().

int mbedtls_pk_verify_ext(mbedtls_pk_type_t type, const void *options, mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg, const unsigned char *hash, size_t hash_len, const unsigned char *sig, size_t sig_len)

Verify signature, with options. (Includes verification of the padding depending on type.)

Note

If hash_len is 0, then the length associated with md_alg is used instead, or an error returned if it is invalid.

Note

md_alg may be MBEDTLS_MD_NONE, only if hash_len != 0

Note

If type is MBEDTLS_PK_RSASSA_PSS, then options must point to a mbedtls_pk_rsassa_pss_options structure, otherwise it must be NULL.

Parameters

type – Signature type (inc. possible padding type) to verify
options – Pointer to type-specific options, or NULL
ctx – The PK context to use. It must have been set up.
md_alg – Hash algorithm used (see notes)
hash – Hash of the message to sign
hash_len – Hash length or 0 (see notes)
sig – Signature to verify
sig_len – Signature length

Returns

0 on success (signature is valid), MBEDTLS_ERR_PK_TYPE_MISMATCH if the PK context can’t be used for this type of signatures, MBEDTLS_ERR_PK_SIG_LEN_MISMATCH if there is a valid signature in sig but its length is less than sig_len, or a specific error code.

int mbedtls_pk_sign(mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg, const unsigned char *hash, size_t hash_len, unsigned char *sig, size_t *sig_len, int (*f_rng)(void*, unsigned char*, size_t), void *p_rng)

Make signature, including padding if relevant.

Note

For RSA keys, the default padding type is PKCS#1 v1.5. There is no interface in the PK module to make RSASSA-PSS signatures yet.

Note

If hash_len is 0, then the length associated with md_alg is used instead, or an error returned if it is invalid.

Note

For RSA, md_alg may be MBEDTLS_MD_NONE if hash_len != 0. For ECDSA, md_alg may never be MBEDTLS_MD_NONE.

Parameters

ctx – The PK context to use. It must have been set up with a private key.
md_alg – Hash algorithm used (see notes)
hash – Hash of the message to sign
hash_len – Hash length or 0 (see notes)
sig – Place to write the signature. It must have enough room for the signature. MBEDTLS_PK_SIGNATURE_MAX_SIZE is always enough. You may use a smaller buffer if it is large enough given the key type.
sig_len – On successful return, the number of bytes written to sig.
f_rng – RNG function
p_rng – RNG parameter

Returns

0 on success, or a specific error code.

int mbedtls_pk_sign_restartable(mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg, const unsigned char *hash, size_t hash_len, unsigned char *sig, size_t *sig_len, int (*f_rng)(void*, unsigned char*, size_t), void *p_rng, mbedtls_pk_restart_ctx *rs_ctx)

Restartable version of mbedtls_pk_sign()

Note

Performs the same job as mbedtls_pk_sign(), but can return early and restart according to the limit set with mbedtls_ecp_set_max_ops() to reduce blocking for ECC operations. For RSA, same as mbedtls_pk_sign().

Parameters

ctx – The PK context to use. It must have been set up with a private key.
md_alg – Hash algorithm used (see notes for mbedtls_pk_sign())
hash – Hash of the message to sign
hash_len – Hash length or 0 (see notes for mbedtls_pk_sign())
sig – Place to write the signature. It must have enough room for the signature. MBEDTLS_PK_SIGNATURE_MAX_SIZE is always enough. You may use a smaller buffer if it is large enough given the key type.
sig_len – On successful return, the number of bytes written to sig.
f_rng – RNG function
p_rng – RNG parameter
rs_ctx – Restart context (NULL to disable restart)

Returns

See mbedtls_pk_sign().

Returns

MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of operations was reached: see mbedtls_ecp_set_max_ops().

int mbedtls_pk_decrypt(mbedtls_pk_context *ctx, const unsigned char *input, size_t ilen, unsigned char *output, size_t *olen, size_t osize, int (*f_rng)(void*, unsigned char*, size_t), void *p_rng)

Decrypt message (including padding if relevant).

Note

For RSA keys, the default padding type is PKCS#1 v1.5.

Parameters

ctx – The PK context to use. It must have been set up with a private key.
input – Input to decrypt
ilen – Input size
output – Decrypted output
olen – Decrypted message length
osize – Size of the output buffer
f_rng – RNG function
p_rng – RNG parameter

Returns

0 on success, or a specific error code.

int mbedtls_pk_encrypt(mbedtls_pk_context *ctx, const unsigned char *input, size_t ilen, unsigned char *output, size_t *olen, size_t osize, int (*f_rng)(void*, unsigned char*, size_t), void *p_rng)

Encrypt message (including padding if relevant).

Note

For RSA keys, the default padding type is PKCS#1 v1.5.

Parameters

ctx – The PK context to use. It must have been set up.
input – Message to encrypt
ilen – Message size
output – Encrypted output
olen – Encrypted output length
osize – Size of the output buffer
f_rng – RNG function
p_rng – RNG parameter

Returns

0 on success, or a specific error code.

int mbedtls_pk_check_pair(const mbedtls_pk_context *pub, const mbedtls_pk_context *prv)

Check if a public-private pair of keys matches.

Parameters

pub – Context holding a public key.
prv – Context holding a private (and public) key.

Returns

0 on success (keys were checked and match each other).

Returns

MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE if the keys could not be checked - in that case they may or may not match.

Returns

MBEDTLS_ERR_PK_BAD_INPUT_DATA if a context is invalid.

Returns

Another non-zero value if the keys do not match.

int mbedtls_pk_debug(const mbedtls_pk_context *ctx, mbedtls_pk_debug_item *items)

Export debug information.

Parameters

ctx – The PK context to use. It must have been initialized.
items – Place to write debug items

Returns

0 on success or MBEDTLS_ERR_PK_BAD_INPUT_DATA

const char *mbedtls_pk_get_name(const mbedtls_pk_context *ctx)

Access the type name.

Parameters: ctx – The PK context to use. It must have been initialized.
Returns: Type name on success, or “invalid PK”

mbedtls_pk_type_t mbedtls_pk_get_type(const mbedtls_pk_context *ctx)

Get the key type.

Parameters: ctx – The PK context to use. It must have been initialized.
Returns: Type on success.
Returns: MBEDTLS_PK_NONE for a context that has not been set up.

static inline mbedtls_rsa_context *mbedtls_pk_rsa(const mbedtls_pk_context pk)

Quick access to an RSA context inside a PK context.

Warning

This function can only be used when the type of the context, as returned by mbedtls_pk_get_type(), is MBEDTLS_PK_RSA. Ensuring that is the caller’s responsibility. Alternatively, you can check whether this function returns NULL.

Returns: The internal RSA context held by the PK context, or NULL.

static inline mbedtls_ecp_keypair *mbedtls_pk_ec(const mbedtls_pk_context pk)

Quick access to an EC context inside a PK context.

Warning

This function can only be used when the type of the context, as returned by mbedtls_pk_get_type(), is MBEDTLS_PK_ECKEY, MBEDTLS_PK_ECKEY_DH, or MBEDTLS_PK_ECDSA. Ensuring that is the caller’s responsibility. Alternatively, you can check whether this function returns NULL.

Returns: The internal EC context held by the PK context, or NULL.

int mbedtls_pk_parse_key(mbedtls_pk_context *ctx, const unsigned char *key, size_t keylen, const unsigned char *pwd, size_t pwdlen)

Parse a private key in PEM or DER format.

Note

On entry, ctx must be empty, either freshly initialised with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a specific key type, check the result with mbedtls_pk_can_do().

Note

The key is also checked for correctness.

Parameters

ctx – The PK context to fill. It must have been initialized but not set up.
key – Input buffer to parse. The buffer must contain the input exactly, with no extra trailing material. For PEM, the buffer must contain a null-terminated string.
keylen – Size of key in bytes. For PEM data, this includes the terminating null byte, so keylen must be equal to strlen(key) + 1.
pwd – Optional password for decryption. Pass NULL if expecting a non-encrypted key. Pass a string of pwdlen bytes if expecting an encrypted key; a non-encrypted key will also be accepted. The empty password is not supported.
pwdlen – Size of the password in bytes. Ignored if pwd is NULL.

Returns

0 if successful, or a specific PK or PEM error code

int mbedtls_pk_parse_public_key(mbedtls_pk_context *ctx, const unsigned char *key, size_t keylen)

Parse a public key in PEM or DER format.

Note

On entry, ctx must be empty, either freshly initialised with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a specific key type, check the result with mbedtls_pk_can_do().

Note

The key is also checked for correctness.

Parameters

ctx – The PK context to fill. It must have been initialized but not set up.
key – Input buffer to parse. The buffer must contain the input exactly, with no extra trailing material. For PEM, the buffer must contain a null-terminated string.
keylen – Size of key in bytes. For PEM data, this includes the terminating null byte, so keylen must be equal to strlen(key) + 1.

Returns

0 if successful, or a specific PK or PEM error code

int mbedtls_pk_parse_keyfile(mbedtls_pk_context *ctx, const char *path, const char *password)

Load and parse a private key.

Note

On entry, ctx must be empty, either freshly initialised with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a specific key type, check the result with mbedtls_pk_can_do().

Note

The key is also checked for correctness.

Parameters

ctx – The PK context to fill. It must have been initialized but not set up.
path – filename to read the private key from
password – Optional password to decrypt the file. Pass NULL if expecting a non-encrypted key. Pass a null-terminated string if expecting an encrypted key; a non-encrypted key will also be accepted. The empty password is not supported.

Returns

0 if successful, or a specific PK or PEM error code

int mbedtls_pk_parse_public_keyfile(mbedtls_pk_context *ctx, const char *path)

Load and parse a public key.

Note

On entry, ctx must be empty, either freshly initialised with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a specific key type, check the result with mbedtls_pk_can_do().

Note

The key is also checked for correctness.

Parameters

ctx – The PK context to fill. It must have been initialized but not set up.
path – filename to read the public key from

Returns

0 if successful, or a specific PK or PEM error code

int mbedtls_pk_write_key_der(mbedtls_pk_context *ctx, unsigned char *buf, size_t size)

Write a private key to a PKCS#1 or SEC1 DER structure Note: data is written at the end of the buffer! Use the return value to determine where you should start using the buffer.

Parameters

ctx – PK context which must contain a valid private key.
buf – buffer to write to
size – size of the buffer

Returns

length of data written if successful, or a specific error code

int mbedtls_pk_write_pubkey_der(mbedtls_pk_context *ctx, unsigned char *buf, size_t size)

Write a public key to a SubjectPublicKeyInfo DER structure Note: data is written at the end of the buffer! Use the return value to determine where you should start using the buffer.

Parameters

ctx – PK context which must contain a valid public or private key.
buf – buffer to write to
size – size of the buffer

Returns

length of data written if successful, or a specific error code

int mbedtls_pk_write_pubkey_pem(mbedtls_pk_context *ctx, unsigned char *buf, size_t size)

Write a public key to a PEM string.

Parameters

ctx – PK context which must contain a valid public or private key.
buf – Buffer to write to. The output includes a terminating null byte.
size – Size of the buffer in bytes.

Returns

0 if successful, or a specific error code

int mbedtls_pk_write_key_pem(mbedtls_pk_context *ctx, unsigned char *buf, size_t size)

Write a private key to a PKCS#1 or SEC1 PEM string.

Parameters

ctx – PK context which must contain a valid private key.
buf – Buffer to write to. The output includes a terminating null byte.
size – Size of the buffer in bytes.

Returns

0 if successful, or a specific error code

int mbedtls_pk_parse_subpubkey(unsigned char **p, const unsigned char *end, mbedtls_pk_context *pk)

Parse a SubjectPublicKeyInfo DER structure.

Parameters

p – the position in the ASN.1 data
end – end of the buffer
pk – The PK context to fill. It must have been initialized but not set up.

Returns

0 if successful, or a specific PK error code

int mbedtls_pk_write_pubkey(unsigned char **p, unsigned char *start, const mbedtls_pk_context *key)

Write a subjectPublicKey to ASN.1 data Note: function works backwards in data buffer.

Parameters

p – reference to current position pointer
start – start of the buffer (for bounds-checking)
key – PK context which must contain a valid public or private key.

Returns

the length written or a negative error code

int mbedtls_pk_load_file(const char *path, unsigned char **buf, size_t *n)

int mbedtls_pk_wrap_as_opaque(mbedtls_pk_context *pk, psa_key_id_t *key, psa_algorithm_t hash_alg)

Turn an EC key into an opaque one.

Note

Only ECDSA keys are supported so far. Signing with the specified hash is the only allowed use of that key.

Warning

This is a temporary utility function for tests. It might change or be removed at any time without notice.

Parameters

pk – Input: the EC key to import to a PSA key. Output: a PK context wrapping that PSA key.
key – Output: a PSA key identifier. It’s the caller’s responsibility to call psa_destroy_key() on that key identifier after calling mbedtls_pk_free() on the PK context.
hash_alg – The hash algorithm to allow for use with that key.

Returns

0 if successful.

Returns

An Mbed TLS error code otherwise.

struct mbedtls_pk_rsassa_pss_options

#include <pk.h>

Options for RSASSA-PSS signature verification. See mbedtls_rsa_rsassa_pss_verify_ext()

Public Members

mbedtls_md_type_t mgf1_hash_id

int expected_salt_len

struct mbedtls_pk_debug_item

#include <pk.h>

Item to send to the debug module.

Public Members

mbedtls_pk_debug_type type

const char *name

void *value

struct mbedtls_pk_context

#include <pk.h>

Public key container.

Public Members

const mbedtls_pk_info_t *pk_info: Public key information

void *pk_ctx: Underlying public key context

struct mbedtls_pk_restart_ctx

#include <pk.h>

Context for resuming operations.

Public Members

const mbedtls_pk_info_t *pk_info: Public key information

void *rs_ctx: Underlying restart context