krb5_crypto_overhead (3) - Linux Manuals

NAME

krb5_crypto_getblocksize krb5_crypto_getconfoundersize krb5_crypto_getenctype krb5_crypto_getpadsize krb5_crypto_overhead krb5_decrypt krb5_decrypt_EncryptedData krb5_decrypt_ivec krb5_decrypt_ticket krb5_encrypt krb5_encrypt_EncryptedData krb5_encrypt_ivec krb5_enctype_disable krb5_enctype_keysize krb5_enctype_to_string krb5_enctype_valid krb5_get_wrapped_length krb5_string_to_enctype - encrypt and decrypt data, set and get encryption type parameters

LIBRARY

Kerberos 5 Library (libkrb5, -lkrb5)

SYNOPSIS

In krb5.h Ft krb5_error_code Fo krb5_encrypt Fa krb5_context context Fa krb5_crypto crypto Fa unsigned usage Fa void *data Fa size_t len Fa krb5_data *result Fc Ft krb5_error_code Fo krb5_encrypt_EncryptedData Fa krb5_context context Fa krb5_crypto crypto Fa unsigned usage Fa void *data Fa size_t len Fa int kvno Fa EncryptedData *result Fc Ft krb5_error_code Fo krb5_encrypt_ivec Fa krb5_context context Fa krb5_crypto crypto Fa unsigned usage Fa void *data Fa size_t len Fa krb5_data *result Fa void *ivec Fc Ft krb5_error_code Fo krb5_decrypt Fa krb5_context context Fa krb5_crypto crypto Fa unsigned usage Fa void *data Fa size_t len Fa krb5_data *result Fc Ft krb5_error_code Fo krb5_decrypt_EncryptedData Fa krb5_context context Fa krb5_crypto crypto Fa unsigned usage Fa EncryptedData *e Fa krb5_data *result Fc Ft krb5_error_code Fo krb5_decrypt_ivec Fa krb5_context context Fa krb5_crypto crypto Fa unsigned usage Fa void *data Fa size_t len Fa krb5_data *result Fa void *ivec Fc Ft krb5_error_code Fo krb5_decrypt_ticket Fa krb5_context context Fa Ticket *ticket Fa krb5_keyblock *key Fa EncTicketPart *out Fa krb5_flags flags Fc Ft krb5_error_code Fo krb5_crypto_getblocksize Fa krb5_context context Fa size_t *blocksize Fc Ft krb5_error_code Fo krb5_crypto_getenctype Fa krb5_context context Fa krb5_crypto crypto Fa krb5_enctype *enctype Fc Ft krb5_error_code Fo krb5_crypto_getpadsize Fa krb5_context context Fa size_t *padsize Fc Ft krb5_error_code Fo krb5_crypto_getconfoundersize Fa krb5_context context Fa krb5_crypto crypto Fa size_t *confoundersize Fc Ft krb5_error_code Fo krb5_enctype_keysize Fa krb5_context context Fa krb5_enctype type Fa size_t *keysize Fc Ft krb5_error_code Fo krb5_crypto_overhead Fa krb5_context context Fa size_t *padsize Fc Ft krb5_error_code Fo krb5_string_to_enctype Fa krb5_context context Fa const char *string Fa krb5_enctype *etype Fc Ft krb5_error_code Fo krb5_enctype_to_string Fa krb5_context context Fa krb5_enctype etype Fa char **string Fc Ft krb5_error_code Fo krb5_enctype_valid Fa krb5_context context Fa krb5_enctype etype Fc Ft void Fo krb5_enctype_disable Fa krb5_context context Fa krb5_enctype etype Fc Ft size_t Fo krb5_get_wrapped_length Fa krb5_context context Fa krb5_crypto crypto Fa size_t data_len Fc

DESCRIPTION

These functions are used to encrypt and decrypt data.

Fn krb5_encrypt_ivec puts the encrypted version of Fa data (of size Fa len ) in Fa result . If the encryption type supports using derived keys, Fa usage should be the appropriate key-usage. Fa ivec is a pointer to a initial IV, it is modified to the end IV at the end of the round. Ivec should be the size of If NULL is passed in, the default IV is used. Fn krb5_encrypt does the same as Fn krb5_encrypt_ivec but with Fa ivec being NULL Fn krb5_encrypt_EncryptedData does the same as Fn krb5_encrypt , but it puts the encrypted data in a Fa EncryptedData structure instead. If Fa kvno is not zero, it will be put in the (optional) Fa kvno field in the Fa EncryptedData .

Fn krb5_decrypt_ivec , Fn krb5_decrypt , and Fn krb5_decrypt_EncryptedData works similarly.

Fn krb5_decrypt_ticket decrypts the encrypted part of Fa ticket with Fa key . Fn krb5_decrypt_ticket also verifies the timestamp in the ticket, invalid flag and if the KDC haven't verified the transited path, the transit path.

Fn krb5_enctype_keysize , Fn krb5_crypto_getconfoundersize , Fn krb5_crypto_getblocksize , Fn krb5_crypto_getenctype , Fn krb5_crypto_getpadsize , Fn krb5_crypto_overhead all returns various (sometimes) useful information from a crypto context. Fn krb5_crypto_overhead is the combination of krb5_crypto_getconfoundersize, krb5_crypto_getblocksize and krb5_crypto_getpadsize and return the maximum overhead size.

Fn krb5_enctype_to_string converts a encryption type number to a string that can be printable and stored. The strings returned should be freed with free(3).

Fn krb5_string_to_enctype converts a encryption type strings to a encryption type number that can use used for other Kerberos crypto functions.

Fn krb5_enctype_valid returns 0 if the encrypt is supported and not disabled, otherwise and error code is returned.

Fn krb5_enctype_disable (globally, for all contextes) disables the Fa enctype .

Fn krb5_get_wrapped_length returns the size of an encrypted packet by Fa crypto of length Fa data_len .