E.6 PKCS 12 API

The following functions are to be used for PKCS 12 handling. Their prototypes lie in gnutls/pkcs12.h.

gnutls_pkcs12_bag_decrypt

Function: int gnutls_pkcs12_bag_decrypt (gnutls_pkcs12_bag_t bag, const char * pass)

bag: The bag

pass: The password used for encryption, must be ASCII.

This function will decrypt the given encrypted bag and return 0 on success.

Returns: On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error code is returned.

gnutls_pkcs12_bag_deinit

Function: void gnutls_pkcs12_bag_deinit (gnutls_pkcs12_bag_t bag)

bag: A pointer to the type to be initialized

This function will deinitialize a PKCS12 Bag structure.

gnutls_pkcs12_bag_enc_info

Function: int gnutls_pkcs12_bag_enc_info (gnutls_pkcs12_bag_t bag, unsigned int * schema, unsigned int * cipher, void * salt, unsigned int * salt_size, unsigned int * iter_count, char ** oid)

bag: The bag

schema: indicate the schema as one of gnutls_pkcs_encrypt_flags_t

cipher: the cipher used as gnutls_cipher_algorithm_t

salt: PBKDF2 salt (if non-NULL then salt_size initially holds its size)

salt_size: PBKDF2 salt size

iter_count: PBKDF2 iteration count

oid: if non-NULL it will contain an allocated null-terminated variable with the OID

This function will provide information on the encryption algorithms used in an encrypted bag. If the structure algorithms are unknown the code GNUTLS_E_UNKNOWN_CIPHER_TYPE will be returned, and only oid , will be set. That is, oid will be set on encrypted bags whether supported or not. It must be deinitialized using gnutls_free() . The other variables are only set on supported structures.

Returns: GNUTLS_E_INVALID_REQUEST if the provided bag isn’t encrypted, GNUTLS_E_UNKNOWN_CIPHER_TYPE if the structure’s encryption isn’t supported, or another negative error code in case of a failure. Zero on success.

gnutls_pkcs12_bag_encrypt

Function: int gnutls_pkcs12_bag_encrypt (gnutls_pkcs12_bag_t bag, const char * pass, unsigned int flags)

bag: The bag

pass: The password used for encryption, must be ASCII

flags: should be one of gnutls_pkcs_encrypt_flags_t elements bitwise or’d

This function will encrypt the given bag.

Returns: On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error code is returned.

gnutls_pkcs12_bag_get_count

Function: int gnutls_pkcs12_bag_get_count (gnutls_pkcs12_bag_t bag)

bag: The bag

This function will return the number of the elements within the bag.

Returns: Number of elements in bag, or an negative error code on error.

gnutls_pkcs12_bag_get_data

Function: int gnutls_pkcs12_bag_get_data (gnutls_pkcs12_bag_t bag, unsigned indx, gnutls_datum_t * data)

bag: The bag

indx: The element of the bag to get the data from

data: where the bag’s data will be. Should be treated as constant.

This function will return the bag’s data. The data is a constant that is stored into the bag. Should not be accessed after the bag is deleted.

Returns: On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value.

gnutls_pkcs12_bag_get_friendly_name

Function: int gnutls_pkcs12_bag_get_friendly_name (gnutls_pkcs12_bag_t bag, unsigned indx, char ** name)

bag: The bag

indx: The bag’s element to add the id

name: will hold a pointer to the name (to be treated as const)

This function will return the friendly name, of the specified bag element. The key ID is usually used to distinguish the local private key and the certificate pair.

Returns: On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value. or a negative error code on error.

gnutls_pkcs12_bag_get_key_id

Function: int gnutls_pkcs12_bag_get_key_id (gnutls_pkcs12_bag_t bag, unsigned indx, gnutls_datum_t * id)

bag: The bag

indx: The bag’s element to add the id

id: where the ID will be copied (to be treated as const)

This function will return the key ID, of the specified bag element. The key ID is usually used to distinguish the local private key and the certificate pair.

Returns: On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value. or a negative error code on error.

gnutls_pkcs12_bag_get_type

Function: int gnutls_pkcs12_bag_get_type (gnutls_pkcs12_bag_t bag, unsigned indx)

bag: The bag

indx: The element of the bag to get the type

This function will return the bag’s type.

Returns: On error a negative error value or one of the gnutls_pkcs12_bag_type_t enumerations.

gnutls_pkcs12_bag_init

Function: int gnutls_pkcs12_bag_init (gnutls_pkcs12_bag_t * bag)

bag: A pointer to the type to be initialized

This function will initialize a PKCS12 bag structure. PKCS12 Bags usually contain private keys, lists of X.509 Certificates and X.509 Certificate revocation lists.

Returns: On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value.

gnutls_pkcs12_bag_set_crl

Function: int gnutls_pkcs12_bag_set_crl (gnutls_pkcs12_bag_t bag, gnutls_x509_crl_t crl)

bag: The bag

crl: the CRL to be copied.

This function will insert the given CRL into the bag. This is just a wrapper over gnutls_pkcs12_bag_set_data() .

Returns: the index of the added bag on success, or a negative error code on failure.

gnutls_pkcs12_bag_set_crt

Function: int gnutls_pkcs12_bag_set_crt (gnutls_pkcs12_bag_t bag, gnutls_x509_crt_t crt)

bag: The bag

crt: the certificate to be copied.

This function will insert the given certificate into the bag. This is just a wrapper over gnutls_pkcs12_bag_set_data() .

Returns: the index of the added bag on success, or a negative value on failure.

gnutls_pkcs12_bag_set_data

Function: int gnutls_pkcs12_bag_set_data (gnutls_pkcs12_bag_t bag, gnutls_pkcs12_bag_type_t type, const gnutls_datum_t * data)

bag: The bag

type: The data’s type

data: the data to be copied.

This function will insert the given data of the given type into the bag.

Returns: the index of the added bag on success, or a negative value on error.

gnutls_pkcs12_bag_set_friendly_name

Function: int gnutls_pkcs12_bag_set_friendly_name (gnutls_pkcs12_bag_t bag, unsigned indx, const char * name)

bag: The bag

indx: The bag’s element to add the id

name: the name

This function will add the given key friendly name, to the specified, by the index, bag element. The name will be encoded as a ’Friendly name’ bag attribute, which is usually used to set a user name to the local private key and the certificate pair.

Returns: On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value. or a negative error code on error.

gnutls_pkcs12_bag_set_key_id

Function: int gnutls_pkcs12_bag_set_key_id (gnutls_pkcs12_bag_t bag, unsigned indx, const gnutls_datum_t * id)

bag: The bag

indx: The bag’s element to add the id

id: the ID

This function will add the given key ID, to the specified, by the index, bag element. The key ID will be encoded as a ’Local key identifier’ bag attribute, which is usually used to distinguish the local private key and the certificate pair.

Returns: On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value. or a negative error code on error.

gnutls_pkcs12_bag_set_privkey

Function: int gnutls_pkcs12_bag_set_privkey (gnutls_pkcs12_bag_t bag, gnutls_x509_privkey_t privkey, const char * password, unsigned flags)

bag: The bag

privkey: the private key to be copied.

password: the password to protect the key with (may be NULL )

flags: should be one of gnutls_pkcs_encrypt_flags_t elements bitwise or’d

This function will insert the given private key into the bag. This is just a wrapper over gnutls_pkcs12_bag_set_data() .

Returns: the index of the added bag on success, or a negative value on failure.

gnutls_pkcs12_deinit

Function: void gnutls_pkcs12_deinit (gnutls_pkcs12_t pkcs12)

pkcs12: The type to be initialized

This function will deinitialize a PKCS12 type.

gnutls_pkcs12_export

Function: int gnutls_pkcs12_export (gnutls_pkcs12_t pkcs12, gnutls_x509_crt_fmt_t format, void * output_data, size_t * output_data_size)

pkcs12: A pkcs12 type

format: the format of output params. One of PEM or DER.

output_data: will contain a structure PEM or DER encoded

output_data_size: holds the size of output_data (and will be replaced by the actual size of parameters)

This function will export the pkcs12 structure to DER or PEM format.

If the buffer provided is not long enough to hold the output, then *output_data_size will be updated and GNUTLS_E_SHORT_MEMORY_BUFFER will be returned.

If the structure is PEM encoded, it will have a header of "BEGIN PKCS12".

Returns: In case of failure a negative error code will be returned, and 0 on success.

gnutls_pkcs12_export2

Function: int gnutls_pkcs12_export2 (gnutls_pkcs12_t pkcs12, gnutls_x509_crt_fmt_t format, gnutls_datum_t * out)

pkcs12: A pkcs12 type

format: the format of output params. One of PEM or DER.

out: will contain a structure PEM or DER encoded

This function will export the pkcs12 structure to DER or PEM format.

The output buffer is allocated using gnutls_malloc() .

If the structure is PEM encoded, it will have a header of "BEGIN PKCS12".

Returns: In case of failure a negative error code will be returned, and 0 on success.

Since: 3.1.3

gnutls_pkcs12_generate_mac

Function: int gnutls_pkcs12_generate_mac (gnutls_pkcs12_t pkcs12, const char * pass)

pkcs12: A pkcs12 type

pass: The password for the MAC

This function will generate a MAC for the PKCS12 structure.

Returns: On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value.

gnutls_pkcs12_generate_mac2

Function: int gnutls_pkcs12_generate_mac2 (gnutls_pkcs12_t pkcs12, gnutls_mac_algorithm_t mac, const char * pass)

pkcs12: A pkcs12 type

mac: the MAC algorithm to use

pass: The password for the MAC

This function will generate a MAC for the PKCS12 structure.

Returns: On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value.

gnutls_pkcs12_get_bag

Function: int gnutls_pkcs12_get_bag (gnutls_pkcs12_t pkcs12, int indx, gnutls_pkcs12_bag_t bag)

pkcs12: A pkcs12 type

indx: contains the index of the bag to extract

bag: An initialized bag, where the contents of the bag will be copied

This function will return a Bag from the PKCS12 structure.

After the last Bag has been read GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE will be returned.

Returns: On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value.

gnutls_pkcs12_import

Function: int gnutls_pkcs12_import (gnutls_pkcs12_t pkcs12, const gnutls_datum_t * data, gnutls_x509_crt_fmt_t format, unsigned int flags)

pkcs12: The data to store the parsed PKCS12.

data: The DER or PEM encoded PKCS12.

format: One of DER or PEM

flags: an ORed sequence of gnutls_privkey_pkcs8_flags

This function will convert the given DER or PEM encoded PKCS12 to the native gnutls_pkcs12_t format. The output will be stored in ’pkcs12’.

If the PKCS12 is PEM encoded it should have a header of "PKCS12".

Returns: On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value.

gnutls_pkcs12_init

Function: int gnutls_pkcs12_init (gnutls_pkcs12_t * pkcs12)

pkcs12: A pointer to the type to be initialized

This function will initialize a PKCS12 type. PKCS12 structures usually contain lists of X.509 Certificates and X.509 Certificate revocation lists.

Returns: On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value.

gnutls_pkcs12_mac_info

Function: int gnutls_pkcs12_mac_info (gnutls_pkcs12_t pkcs12, unsigned int * mac, void * salt, unsigned int * salt_size, unsigned int * iter_count, char ** oid)

pkcs12: A pkcs12 type

mac: the MAC algorithm used as gnutls_mac_algorithm_t

salt: the salt used for string to key (if non-NULL then salt_size initially holds its size)

salt_size: string to key salt size

iter_count: string to key iteration count

oid: if non-NULL it will contain an allocated null-terminated variable with the OID

This function will provide information on the MAC algorithm used in a PKCS 12 structure. If the structure algorithms are unknown the code GNUTLS_E_UNKNOWN_HASH_ALGORITHM will be returned, and only oid , will be set. That is, oid will be set on structures with a MAC whether supported or not. It must be deinitialized using gnutls_free() . The other variables are only set on supported structures.

Returns: GNUTLS_E_INVALID_REQUEST if the provided structure doesn’t contain a MAC, GNUTLS_E_UNKNOWN_HASH_ALGORITHM if the structure’s MAC isn’t supported, or another negative error code in case of a failure. Zero on success.

gnutls_pkcs12_set_bag

Function: int gnutls_pkcs12_set_bag (gnutls_pkcs12_t pkcs12, gnutls_pkcs12_bag_t bag)

pkcs12: should contain a gnutls_pkcs12_t type

bag: An initialized bag

This function will insert a Bag into the PKCS12 structure.

Returns: On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value.

gnutls_pkcs12_simple_parse

Function: int gnutls_pkcs12_simple_parse (gnutls_pkcs12_t p12, const char * password, gnutls_x509_privkey_t * key, gnutls_x509_crt_t ** chain, unsigned int * chain_len, gnutls_x509_crt_t ** extra_certs, unsigned int * extra_certs_len, gnutls_x509_crl_t * crl, unsigned int flags)

p12: A pkcs12 type

password: optional password used to decrypt the structure, bags and keys.

key: a structure to store the parsed private key.

chain: the corresponding to key certificate chain (may be NULL )

chain_len: will be updated with the number of additional (may be NULL )

extra_certs: optional pointer to receive an array of additional certificates found in the PKCS12 structure (may be NULL ).

extra_certs_len: will be updated with the number of additional certs (may be NULL ).

crl: an optional structure to store the parsed CRL (may be NULL ).

flags: should be zero or one of GNUTLS_PKCS12_SP_*

This function parses a PKCS12 structure in pkcs12 and extracts the private key, the corresponding certificate chain, any additional certificates and a CRL. The structures in key , chain crl , and extra_certs must not be initialized.

The extra_certs and extra_certs_len parameters are optional and both may be set to NULL . If either is non-NULL , then both must be set. The value for extra_certs is allocated using gnutls_malloc() .

Encrypted PKCS12 bags and PKCS8 private keys are supported, but only with password based security and the same password for all operations.

Note that a PKCS12 structure may contain many keys and/or certificates, and there is no way to identify which key/certificate pair you want. For this reason this function is useful for PKCS12 files that contain only one key/certificate pair and/or one CRL.

If the provided structure has encrypted fields but no password is provided then this function returns GNUTLS_E_DECRYPTION_FAILED .

Note that normally the chain constructed does not include self signed certificates, to comply with TLS’ requirements. If, however, the flag GNUTLS_PKCS12_SP_INCLUDE_SELF_SIGNED is specified then self signed certificates will be included in the chain.

Prior to using this function the PKCS 12 structure integrity must be verified using gnutls_pkcs12_verify_mac() .

Returns: On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value.

Since: 3.1.0

gnutls_pkcs12_verify_mac

Function: int gnutls_pkcs12_verify_mac (gnutls_pkcs12_t pkcs12, const char * pass)

pkcs12: should contain a gnutls_pkcs12_t type

pass: The password for the MAC

This function will verify the MAC for the PKCS12 structure.

Returns: On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value.