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In computer science, an operator takes the values of its operands and combines them in some way to produce a new value.
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dsa_size(3) [opendarwin man page]

DSA_size(3)							      OpenSSL							       DSA_size(3)

DSA_size - get DSA signature size SYNOPSIS
#include <openssl/dsa.h> int DSA_size(const DSA *dsa); DESCRIPTION
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. RETURN VALUE
The size in bytes. SEE ALSO
dsa(3), DSA_sign(3) HISTORY
DSA_size() is available in all versions of SSLeay and OpenSSL. 0.9.7d 2003-11-20 DSA_size(3)

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DSA_sign(3)							      OpenSSL							       DSA_sign(3)

DSA_sign, DSA_sign_setup, DSA_verify - DSA signatures SYNOPSIS
#include <openssl/dsa.h> 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, BIGNUM **rp); int DSA_verify(int type, const unsigned char *dgst, int len, unsigned char *sigbuf, int siglen, DSA *dsa); DESCRIPTION
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 key. The type parameter is ignored. The PRNG must be seeded before DSA_sign() (or DSA_sign_setup()) is called. RETURN VALUES
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). CONFORMING TO
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. 0.9.8 2009-04-03 DSA_sign(3)

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