KRB5_ENCRYPT(3)

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

DESCRIPTION
These functions are used to encrypt and decrypt data.

krb5_encrypt_ivec() puts the encrypted version of data (of size len) in result. If the encryption type supports using derived keys, usage should be the appropriate key-usage. 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. krb5_encrypt() does the same as krb5_encrypt_ivec() but with ivec being NULL. krb5_encrypt_EncryptedData() does the same as krb5_encrypt(), but it puts the encrypted data in a EncryptedData structure instead. If kvno is not zero, it will be put in the (optional) kvno field in the EncryptedData.

krb5_decrypt_ivec(), krb5_decrypt(), and krb5_decrypt_EncryptedData() works similarly.

krb5_decrypt_ticket() decrypts the encrypted part of ticket with key. 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.

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

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).

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

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

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

krb5_get_wrapped_length() returns the size of an encrypted packet by crypto of length data_len.

SEE ALSO
krb5_create_checksum(3), krb5_crypto_init(3)