NAME

     krb5_c_block_size, krb5_c_decrypt, krb5_c_encrypt, krb5_c_encrypt_length, krb5_c_enctype_compare,
     krb5_c_get_checksum, krb5_c_is_coll_proof_cksum, krb5_c_is_keyed_cksum, krb5_c_keylength,
     krb5_c_make_checksum, krb5_c_make_random_key, krb5_c_set_checksum, krb5_c_valid_cksumtype,
     krb5_c_valid_enctype, krb5_c_verify_checksum, krb5_c_checksum_length — Kerberos 5 crypto API

LIBRARY

     Kerberos 5 Library (libkrb5, -lkrb5)

SYNOPSIS

     #include <krb5.h>

     krb5_error_code
     krb5_c_block_size(krb5_context context, krb5_enctype enctype, size_t *blocksize);

     krb5_error_code
     krb5_c_decrypt(krb5_context context, const krb5_keyblock key, krb5_keyusage usage, const krb5_data *ivec,
         krb5_enc_data *input, krb5_data *output);

     krb5_error_code
     krb5_c_encrypt(krb5_context context, const krb5_keyblock *key, krb5_keyusage usage, const krb5_data *ivec,
         const krb5_data *input, krb5_enc_data *output);

     krb5_error_code
     krb5_c_encrypt_length(krb5_context context, krb5_enctype enctype, size_t inputlen, size_t *length);

     krb5_error_code
     krb5_c_enctype_compare(krb5_context context, krb5_enctype e1, krb5_enctype e2, krb5_boolean *similar);

     krb5_error_code
     krb5_c_make_random_key(krb5_context context, krb5_enctype enctype, krb5_keyblock *random_key);

     krb5_error_code
     krb5_c_make_checksum(krb5_context context, krb5_cksumtype cksumtype, const krb5_keyblock *key,
         krb5_keyusage usage, const krb5_data *input, krb5_checksum *cksum);

     krb5_error_code
     krb5_c_verify_checksum(krb5_context context, const krb5_keyblock *key, krb5_keyusage usage,
         const krb5_data *data, const krb5_checksum *cksum, krb5_boolean *valid);

     krb5_error_code
     krb5_c_checksum_length(krb5_context context, krb5_cksumtype cksumtype, size_t *length);

     krb5_error_code
     krb5_c_get_checksum(krb5_context context, const krb5_checksum *cksum, krb5_cksumtype *type,
         krb5_data **data);

     krb5_error_code
     krb5_c_set_checksum(krb5_context context, krb5_checksum *cksum, krb5_cksumtype type,
         const krb5_data *data);

     krb5_boolean
     krb5_c_valid_enctype(krb5_enctype, etype");

     krb5_boolean
     krb5_c_valid_cksumtype(krb5_cksumtype ctype);

     krb5_boolean
     krb5_c_is_coll_proof_cksum(krb5_cksumtype ctype);

     krb5_boolean
     krb5_c_is_keyed_cksum(krb5_cksumtype ctype);

     krb5_error_code
     krb5_c_keylengths(krb5_context context, krb5_enctype enctype, size_t *inlength, size_t *keylength);

DESCRIPTION

     The functions starting with krb5_c are compat functions with MIT kerberos.

     The krb5_enc_data structure holds and encrypted data.  There are two public accessable members of
     krb5_enc_data.  enctype that holds the encryption type of the data encrypted and ciphertext that is a
     krb5_data that might contain the encrypted data.

     krb5_c_block_size() returns the blocksize of the encryption type.

     krb5_c_decrypt() decrypts input and store the data in output. If ivec is NULL the default initialization
     vector for that encryption type will be used.

     krb5_c_encrypt() encrypts the plaintext in input and store the ciphertext in output.

     krb5_c_encrypt_length() returns the length the encrypted data given the plaintext length.

     krb5_c_enctype_compare() compares to encryption types and returns if they use compatible encryption key
     types.

     krb5_c_make_checksum() creates a checksum cksum with the checksum type cksumtype of the data in data.  key
     and usage are used if the checksum is a keyed checksum type.  Returns 0 or an error code.

     krb5_c_verify_checksum() verifies the checksum of data in cksum that was created with key using the key
     usage usage.  verify is set to non-zero if the checksum verifies correctly and zero if not.  Returns 0 or
     an error code.

     krb5_c_checksum_length() returns the length of the checksum.

     krb5_c_set_checksum() sets the krb5_checksum structure given type and data.  The content of cksum should be
     freeed with krb5_c_free_checksum_contents().

     krb5_c_get_checksum() retrieves the components of the krb5_checksum.  structure.  data should be free with
     krb5_free_data().  If some either of data or checksum is not needed for the application, NULL can be passed
     in.

     krb5_c_valid_enctype() returns true if etype is a valid encryption type.

     krb5_c_valid_cksumtype() returns true if ctype is a valid checksum type.

     krb5_c_is_keyed_cksum() return true if ctype is a keyed checksum type.

     krb5_c_is_coll_proof_cksum() returns true if ctype is a collision proof checksum type.

     krb5_c_keylengths() return the minimum length (inlength) bytes needed to create a key and the length
     (keylength) of the resulting key for the enctype.

SEE ALSO

     krb5(3), krb5_create_checksum(3), krb5_free_data(3), kerberos(8)