DSA_size(3SSL) OpenSSL DSA_size(3SSL)NAME
DSA_size - get DSA signature size
int DSA_size(const DSA *dsa);
This function returns the size of an ASN.1 encoded DSA signature in bytes. It can be used to determine how much memory must be allocated
for a DSA signature.
dsa->q must not be NULL.
The size in bytes.
SEE ALSO dsa(3), DSA_sign(3)HISTORY
DSA_size() is available in all versions of SSLeay and OpenSSL.
1.0.1e 2013-02-11 DSA_size(3SSL)
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DSA_sign(3SSL) OpenSSL DSA_sign(3SSL)NAME
DSA_sign, DSA_sign_setup, DSA_verify - DSA signatures
int DSA_sign(int type, const unsigned char *dgst, int len,
unsigned char *sigret, unsigned int *siglen, DSA *dsa);
int DSA_sign_setup(DSA *dsa, BN_CTX *ctx, BIGNUM **kinvp,
int DSA_verify(int type, const unsigned char *dgst, int len,
unsigned char *sigbuf, int siglen, DSA *dsa);
DSA_sign() computes a digital signature on the len byte message digest dgst using the private key dsa and places its ASN.1 DER encoding at
sigret. The length of the signature is places in *siglen. sigret must point to DSA_size(dsa) bytes of memory.
DSA_sign_setup() may be used to precompute part of the signing operation in case signature generation is time-critical. It expects dsa to
contain DSA parameters. It places the precomputed values in newly allocated BIGNUMs at *kinvp and *rp, after freeing the old ones unless
*kinvp and *rp are NULL. These values may be passed to DSA_sign() in dsa->kinv and dsa->r. ctx is a pre-allocated BN_CTX or NULL.
DSA_verify() verifies that the signature sigbuf of size siglen matches a given message digest dgst of size len. dsa is the signer's public
The type parameter is ignored.
The PRNG must be seeded before DSA_sign() (or DSA_sign_setup()) is called.
DSA_sign() and DSA_sign_setup() return 1 on success, 0 on error. DSA_verify() returns 1 for a valid signature, 0 for an incorrect
signature and -1 on error. The error codes can be obtained by ERR_get_error(3).
US Federal Information Processing Standard FIPS 186 (Digital Signature Standard, DSS), ANSI X9.30
SEE ALSO dsa(3), ERR_get_error(3), rand(3), DSA_do_sign(3)HISTORY
DSA_sign() and DSA_verify() are available in all versions of SSLeay. DSA_sign_setup() was added in SSLeay 0.8.
1.0.1e 2013-02-11 DSA_sign(3SSL)
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