heimdal/lib/krb5/krb5_encrypt.3

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.Dd March 20, 2004
.Dt KRB5_ENCRYPT 3
.Os HEIMDAL
.Sh NAME
.Nm krb5_crypto_getblocksize ,
.Nm krb5_crypto_getconfoundersize
.Nm krb5_crypto_getenctype ,
.Nm krb5_crypto_getpadsize ,
.Nm krb5_decrypt ,
.Nm krb5_decrypt_EncryptedData ,
.Nm krb5_decrypt_ticket ,
.Nm krb5_encrypt ,
.Nm krb5_encrypt_EncryptedData,
.Nm krb5_enctype_disable ,
.Nm krb5_enctype_is_disabled ,
.Nm krb5_enctype_keysize ,
.Nm krb5_enctype_to_string ,
.Nm krb5_get_wrapped_length ,
.Nm krb5_string_to_enctype
.Nd encrypt and decrypt data, set and get encryption type parameters
.Sh LIBRARY
Kerberos 5 Library (libkrb5, -lkrb5)
.Sh SYNOPSIS
.In krb5.h
.Ft krb5_error_code
.Fn krb5_encrypt "krb5_context context" "krb5_crypto crypto" "unsigned usage" "void *data" "size_t len" "krb5_data *result"
.Ft krb5_error_code
.Fn krb5_encrypt_EncryptedData "krb5_context context" "krb5_crypto crypto" "unsigned usage" "void *data" "size_t len" "int kvno" "EncryptedData *result"
.Ft krb5_error_code
.Fn krb5_decrypt "krb5_context context" "krb5_crypto crypto" "unsigned usage" "void *data" "size_t len" "krb5_data *result"
.Ft krb5_error_code
.Fn krb5_decrypt_EncryptedData "krb5_context context" "krb5_crypto crypto" "unsigned usage" "EncryptedData *e" "krb5_data *result"
.Ft krb5_error_code
.Fn krb5_decrypt_ticket "krb5_context context" "Ticket *ticket" "krb5_keyblock *key" "EncTicketPart *out" "krb5_flags flags"
.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_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_boolean
.Fo krb5_enctype_is_disabled
.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
.Sh DESCRIPTION
These functions are used to encrypt and decrypt data.
.Pp
.Fn krb5_encrypt
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.
.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
.Fa kvno field in the
.Fa EncryptedData .
.Pp
.Fn krb5_decrypt ,
and
.Fn krb5_decrypt_EncryptedData
works similarly.
.Pp
.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.
.Pp
.Fn krb5_enctype_keysize ,
.Fn krb5_crypto_getconfoundersize ,
.Fn krb5_crypto_getblocksize ,
.Fn krb5_crypto_getenctype ,
.Fn krb5_crypto_getpadsize
all returns various (sometimes) useful information from a crypto context.
.Pp
.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
.Xr free 3 .
.Pp
.Fn krb5_string_to_enctype
converts a encryption type strings to a encryption type number that
can use used for other Kerberos crypto functions.
.Pp
.Fn krb5_enctype_is_disabled
return non-zero if
.Fa enctype
is (globally) disabled (and thus can't be used for
encryption/decryption).
.Pp
.Fn krb5_enctype_disable
(globally, for all contextes) disables the
.Fa enctype .
.Pp
.Fn krb5_get_wrapped_length
returns the size of an encrypted packet by
.Fa crypto
of length
.Fa data_len .
.\" .Sh EXAMPLE
.\" .Sh BUGS
.Sh SEE ALSO
.Xr krb5_create_checksum 3 ,
.Xr krb5_crypto_init 3