diff options
Diffstat (limited to 'crypto/openssl/doc/crypto/EVP_VerifyInit.pod')
| -rw-r--r-- | crypto/openssl/doc/crypto/EVP_VerifyInit.pod | 36 |
1 files changed, 25 insertions, 11 deletions
diff --git a/crypto/openssl/doc/crypto/EVP_VerifyInit.pod b/crypto/openssl/doc/crypto/EVP_VerifyInit.pod index 5d0d1fb..b6afaed 100644 --- a/crypto/openssl/doc/crypto/EVP_VerifyInit.pod +++ b/crypto/openssl/doc/crypto/EVP_VerifyInit.pod @@ -8,30 +8,35 @@ EVP_VerifyInit, EVP_VerifyUpdate, EVP_VerifyFinal - EVP signature verification f #include <openssl/evp.h> - void EVP_VerifyInit(EVP_MD_CTX *ctx, const EVP_MD *type); - void EVP_VerifyUpdate(EVP_MD_CTX *ctx, const void *d, unsigned int cnt); + int EVP_VerifyInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl); + int EVP_VerifyUpdate(EVP_MD_CTX *ctx, const void *d, unsigned int cnt); int EVP_VerifyFinal(EVP_MD_CTX *ctx,unsigned char *sigbuf, unsigned int siglen,EVP_PKEY *pkey); + int EVP_VerifyInit(EVP_MD_CTX *ctx, const EVP_MD *type); + =head1 DESCRIPTION The EVP signature verification routines are a high level interface to digital signatures. -EVP_VerifyInit() initializes a verification context B<ctx> to using digest -B<type>: this will typically be supplied by a function such as EVP_sha1(). +EVP_VerifyInit_ex() sets up verification context B<ctx> to use digest +B<type> from ENGINE B<impl>. B<ctx> must be initialized by calling +EVP_MD_CTX_init() before calling this function. EVP_VerifyUpdate() hashes B<cnt> bytes of data at B<d> into the verification context B<ctx>. This function can be called several times on the same B<ctx> to include additional data. EVP_VerifyFinal() verifies the data in B<ctx> using the public key B<pkey> -and against the B<siglen> bytes at B<sigbuf>. After calling EVP_VerifyFinal() -no additional calls to EVP_VerifyUpdate() can be made, but EVP_VerifyInit() -can be called to initialize a new verification operation. +and against the B<siglen> bytes at B<sigbuf>. + +EVP_VerifyInit() initializes verification context B<ctx> to use the default +implementation of digest B<type>. =head1 RETURN VALUES -EVP_VerifyInit() and EVP_VerifyUpdate() do not return values. +EVP_VerifyInit_ex() and EVP_VerifyUpdate() return 1 for success and 0 for +failure. EVP_VerifyFinal() returns 1 for a correct signature, 0 for failure and -1 if some other error occurred. @@ -49,11 +54,18 @@ digest algorithm must be used with the correct public key type. A list of algorithms and associated public key algorithms appears in L<EVP_DigestInit(3)|EVP_DigestInit(3)>. +The call to EVP_VerifyFinal() internally finalizes a copy of the digest context. +This means that calls to EVP_VerifyUpdate() and EVP_VerifyFinal() can be called +later to digest and verify additional data. + +Since only a copy of the digest context is ever finalized the context must +be cleaned up after use by calling EVP_MD_CTX_cleanup() or a memory leak +will occur. + =head1 BUGS -Several of the functions do not return values: maybe they should. Although the -internal digest operations will never fail some future hardware based operations -might. +Older versions of this documentation wrongly stated that calls to +EVP_VerifyUpdate() could not be made after calling EVP_VerifyFinal(). =head1 SEE ALSO @@ -69,4 +81,6 @@ L<sha(3)|sha(3)>, L<dgst(1)|dgst(1)> EVP_VerifyInit(), EVP_VerifyUpdate() and EVP_VerifyFinal() are available in all versions of SSLeay and OpenSSL. +EVP_VerifyInit_ex() was added in OpenSSL 0.9.7 + =cut |
