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32 .\" $Id: krb5_create_checksum.3,v 1.6 2003/04/16 13:58:14 lha Exp $
38 .Nm krb5_checksum_is_collision_proof ,
39 .Nm krb5_checksum_is_keyed ,
40 .Nm krb5_checksumsize ,
41 .Nm krb5_create_checksum ,
42 .Nm krb5_verify_checksum
43 .Nd creates and verifies checksums
45 Kerberos 5 Library (libkrb5, -lkrb5)
49 .Fn krb5_create_checksum "krb5_context context" "krb5_crypto crypto" "unsigned usage_or_type" "void *data" "size_t len" "Checksum *result"
51 .Fn krb5_verify_checksum "krb5_context context" "krb5_crypto crypto" "krb5_key_usage usage" "void *data" "size_t len" "Checksum *cksum"
53 .Fn krb5_checksum_is_collision_proof "krb5_context context" "krb5_cksumtype type"
55 .Fn krb5_checksum_is_keyed "krb5_context context" "krb5_cksumtype type"
57 These functions are used to create and verify checksums.
58 .Fn krb5_create_checksum
59 creates a checksum of the specified data, and puts it in
66 specifies the checksum type to use; it must not be keyed. Otherwise
68 is an encryption context created by
69 .Fn krb5_crypto_init ,
72 specifies a key-usage.
74 .Fn krb5_verify_checksum
77 against the provided data.
79 .Fn krb5_checksum_is_collision_proof
80 returns true is the specified checksum is collision proof (that it's
81 very unlikely that two strings has the same hash value, and that it's
82 hard to find two strings that has the same hash). Examples of
83 collision proof checksums are MD5, and SHA1, while CRC32 is not.
85 .Fn krb5_checksum_is_keyed
86 returns true if the specified checksum type is keyed (that the hash
87 value is a function of both the data, and a separate key). Examples of
88 keyed hash algorithms are HMAC-SHA1-DES3, and RSA-MD5-DES. The
90 hash functions MD5, and SHA1 are not keyed.
94 .Xr krb5_crypto_init 3 ,