67 lines
2.0 KiB
Plaintext
67 lines
2.0 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
EVP_PKEY_verify_init, EVP_PKEY_verify - signature verification using a public key algorithm
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/evp.h>
|
|
|
|
int EVP_PKEY_verify_init(EVP_PKEY_CTX *ctx);
|
|
int EVP_PKEY_verify(EVP_PKEY_CTX *ctx,
|
|
const unsigned char *sig, size_t siglen,
|
|
const unsigned char *tbs, size_t tbslen);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
The EVP_PKEY_verify_init() function initializes a public key algorithm
|
|
context using key B<pkey> for a signature verification operation.
|
|
|
|
The EVP_PKEY_verify() function performs a public key verification operation
|
|
using B<ctx>. The signature is specified using the B<sig> and
|
|
B<siglen> parameters. The verified data (i.e. the data believed originally
|
|
signed) is specified using the B<tbs> and B<tbslen> parameters.
|
|
|
|
=head1 NOTES
|
|
|
|
After the call to EVP_PKEY_verify_init() algorithm specific control
|
|
operations can be performed to set any appropriate parameters for the
|
|
operation.
|
|
|
|
The function EVP_PKEY_verify() can be called more than once on the same
|
|
context if several operations are performed using the same parameters.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
EVP_PKEY_verify_init() and EVP_PKEY_verify() return 1 if the verification
|
|
was successful and 0 if it failed. Unlike other functions the return value
|
|
0 only indicates that the signature did not not verify successfully (that is
|
|
tbs did not match the original data or the signature was of invalid form)
|
|
it is not an indication of a more serious error.
|
|
|
|
A negative value indicates an error other that signature verification failure.
|
|
In particular a return value of -2 indicates the operation is not supported by
|
|
the public key algorithm.
|
|
|
|
=head1 EXAMPLE
|
|
|
|
Verify signature using PKCS#1 and SHA256 digest:
|
|
|
|
[to be added]
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<EVP_PKEY_CTX_new(3)|EVP_PKEY_CTX_new(3)>,
|
|
L<EVP_PKEY_encrypt(3)|EVP_PKEY_encrypt(3)>,
|
|
L<EVP_PKEY_decrypt(3)|EVP_PKEY_decrypt(3)>,
|
|
L<EVP_PKEY_sign(3)|EVP_PKEY_sign(3)>,
|
|
L<EVP_PKEY_verifyrecover(3)|EVP_PKEY_verifyrecover(3)>,
|
|
L<EVP_PKEY_derive(3)|EVP_PKEY_derive(3)>
|
|
|
|
=head1 HISTORY
|
|
|
|
These functions were first added to OpenSSL 0.9.9.
|
|
|
|
=cut
|