diff options
Diffstat (limited to 'g10/keyid.c')
| -rw-r--r-- | g10/keyid.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/g10/keyid.c b/g10/keyid.c index 23712e2a4..caf2e4f6f 100644 --- a/g10/keyid.c +++ b/g10/keyid.c @@ -867,6 +867,38 @@ fingerprint_from_pk (PKT_public_key *pk, byte *array, size_t *ret_len) } +/* + * Get FPR20 for the given PK/SK into ARRAY. + * + * FPR20 is special form of fingerprint of length 20 for the record of + * trustdb. For v4key, having fingerprint with SHA-1, FPR20 is the + * same one. For v5key, FPR20 is constructed from its fingerprint + * with SHA-2, so that its kid of last 8-byte can be as same as + * kid of v5key fingerprint. + * + */ +void +fpr20_from_pk (PKT_public_key *pk, byte array[20]) +{ + if (!pk->fprlen) + compute_fingerprint (pk); + + if (!array) + array = xmalloc (pk->fprlen); + + if (pk->fprlen == 32) /* v5 fingerprint */ + { + memcpy (array + 0, pk->fpr + 20, 4); + memcpy (array + 4, pk->fpr + 24, 4); + memcpy (array + 8, pk->fpr + 28, 4); + memcpy (array + 12, pk->fpr + 0, 4); /* kid[0] */ + memcpy (array + 16, pk->fpr + 4, 4); /* kid[1] */ + } + else /* v4 fingerprint */ + memcpy (array, pk->fpr, 20); +} + + /* Return an allocated buffer with the fingerprint of PK formatted as * a plain hexstring. If BUFFER is NULL the result is a malloc'd * string. If BUFFER is not NULL the result will be copied into this |