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Add DSA_bits() function.

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RT#4637

Reviewed-by: Rich Salz <rsalz@openssl.org>
This commit is contained in:
Dr. Stephen Henson 2016-08-01 18:37:03 +01:00
parent 6c1f368d88
commit 5d8d9a8efa
4 changed files with 18 additions and 6 deletions
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2
crypto/dsa/dsa_ameth.c
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@ -254,7 +254,7 @@ static int int_dsa_size(const EVP_PKEY *pkey)
static int dsa_bits(const EVP_PKEY *pkey)
{
return BN_num_bits(pkey->pkey.dsa->p);
return DSA_bits(pkey->pkey.dsa);
}
static int dsa_security_bits(const EVP_PKEY *pkey)

5
crypto/dsa/dsa_lib.c
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@ -339,3 +339,8 @@ ENGINE *DSA_get0_engine(DSA *d)
{
return d->engine;
}
int DSA_bits(const DSA *dsa)
{
return BN_num_bits(dsa->p);
}

16
doc/crypto/DSA_size.pod
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@ -2,25 +2,31 @@
=head1 NAME
DSA_size - get DSA signature size
DSA_size, DSA_bits - get DSA signature size or key bits
=head1 SYNOPSIS
#include <openssl/dsa.h>
int DSA_size(const DSA *dsa);
int DSA_bits(const DSA *dsa);
=head1 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_size() returns the maximum size of an ASN.1 encoded DSA signature
for key B<dsa> in bytes. It can be used to determine how much memory must
be allocated for a DSA signature.
B<dsa-E<gt>q> must not be B<NULL>.
DSA_bits() returns the number of bits in key B<dsa>: this is the number
of bits in the B<p> parameter.
=head1 RETURN VALUE
The size in bytes.
DSA_size() returns the size in bytes.
DSA_bits() returns the number of bits in the key.
=head1 SEE ALSO

1
include/openssl/dsa.h
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@ -101,6 +101,7 @@ void DSA_free(DSA *r);
/* "up" the DSA object's reference count */
int DSA_up_ref(DSA *r);
int DSA_size(const DSA *);
int DSA_bits(const DSA *d);
int DSA_security_bits(const DSA *d);
/* next 4 return -1 on error */
int DSA_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp);