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GNU/Linux |
CentOS 5.6 |
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DSA_verify(3ssl) |
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DSA_sign, DSA_sign_setup, DSA_verify − DSA signatures
#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);
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 BIGNUM s 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.
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
dsa(3), ERR_get_error(3), rand(3), DSA_do_sign(3)
DSA_sign() and DSA_verify() are available in all versions of SSLeay. DSA_sign_setup() was added in SSLeay 0.8.
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DSA_verify(3ssl) | |