diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/gcrypt.texi | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/doc/gcrypt.texi b/doc/gcrypt.texi index 770a2451..4c8cdb15 100644 --- a/doc/gcrypt.texi +++ b/doc/gcrypt.texi @@ -2364,6 +2364,7 @@ Here, the data to be signed is directly given as an @var{MPI}. @noindent For DSA the input data is expected in this format: + @example (data (flags raw) @@ -2411,11 +2412,28 @@ S-expression returned is: @end example Where @var{r-mpi} and @var{s-mpi} are the result of the DSA sign -operation. For Elgamal signing (which is slow, yields large numbers -and probably is not as secure as the other algorithms), the same format is -used with "elg" replacing "dsa"; for ECDSA signing, the same format is used +operation. + +For Elgamal signing (which is slow, yields large numbers and probably +is not as secure as the other algorithms), the same format is used +with "elg" replacing "dsa"; for ECDSA signing, the same format is used with "ecdsa" replacing "dsa". +For the EdDSA algorithm (cf. Ed25515) the required input parameters are: + +@example +(data + (flags eddsa) + (hash-algo sha-512) + (value @var{message})) +@end example + +Note that the @var{message} may be of any length; hashing is part of +the algorithm. Using a large data block for @var{message} is not +suggested; in that case the used protocol should better require that a +hash of the message is used as input to the EdDSA algorithm. + + @end deftypefun @c end gcry_pk_sign |