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author | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
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committer | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
commit | 3562e78743202e43aec8727005182a2558117eca (patch) | |
tree | 8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /openssl/doc/crypto/EVP_SignInit.pod | |
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Diffstat (limited to 'openssl/doc/crypto/EVP_SignInit.pod')
-rw-r--r-- | openssl/doc/crypto/EVP_SignInit.pod | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/openssl/doc/crypto/EVP_SignInit.pod b/openssl/doc/crypto/EVP_SignInit.pod new file mode 100644 index 000000000..b6e62ce7f --- /dev/null +++ b/openssl/doc/crypto/EVP_SignInit.pod @@ -0,0 +1,95 @@ +=pod + +=head1 NAME + +EVP_SignInit, EVP_SignUpdate, EVP_SignFinal - EVP signing functions + +=head1 SYNOPSIS + + #include <openssl/evp.h> + + int EVP_SignInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl); + int EVP_SignUpdate(EVP_MD_CTX *ctx, const void *d, unsigned int cnt); + int EVP_SignFinal(EVP_MD_CTX *ctx,unsigned char *sig,unsigned int *s, EVP_PKEY *pkey); + + void EVP_SignInit(EVP_MD_CTX *ctx, const EVP_MD *type); + + int EVP_PKEY_size(EVP_PKEY *pkey); + +=head1 DESCRIPTION + +The EVP signature routines are a high level interface to digital +signatures. + +EVP_SignInit_ex() sets up signing context B<ctx> to use digest +B<type> from ENGINE B<impl>. B<ctx> must be initialized with +EVP_MD_CTX_init() before calling this function. + +EVP_SignUpdate() hashes B<cnt> bytes of data at B<d> into the +signature context B<ctx>. This function can be called several times on the +same B<ctx> to include additional data. + +EVP_SignFinal() signs the data in B<ctx> using the private key B<pkey> and +places the signature in B<sig>. The number of bytes of data written (i.e. the +length of the signature) will be written to the integer at B<s>, at most +EVP_PKEY_size(pkey) bytes will be written. + +EVP_SignInit() initializes a signing context B<ctx> to use the default +implementation of digest B<type>. + +EVP_PKEY_size() returns the maximum size of a signature in bytes. The actual +signature returned by EVP_SignFinal() may be smaller. + +=head1 RETURN VALUES + +EVP_SignInit_ex(), EVP_SignUpdate() and EVP_SignFinal() return 1 +for success and 0 for failure. + +EVP_PKEY_size() returns the maximum size of a signature in bytes. + +The error codes can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>. + +=head1 NOTES + +The B<EVP> interface to digital signatures should almost always be used in +preference to the low level interfaces. This is because the code then becomes +transparent to the algorithm used and much more flexible. + +Due to the link between message digests and public key algorithms the correct +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)>. + +When signing with DSA private keys the random number generator must be seeded +or the operation will fail. The random number generator does not need to be +seeded for RSA signatures. + +The call to EVP_SignFinal() internally finalizes a copy of the digest context. +This means that calls to EVP_SignUpdate() and EVP_SignFinal() can be called +later to digest and sign 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 + +Older versions of this documentation wrongly stated that calls to +EVP_SignUpdate() could not be made after calling EVP_SignFinal(). + +=head1 SEE ALSO + +L<EVP_VerifyInit(3)|EVP_VerifyInit(3)>, +L<EVP_DigestInit(3)|EVP_DigestInit(3)>, L<err(3)|err(3)>, +L<evp(3)|evp(3)>, L<hmac(3)|hmac(3)>, L<md2(3)|md2(3)>, +L<md5(3)|md5(3)>, L<mdc2(3)|mdc2(3)>, L<ripemd(3)|ripemd(3)>, +L<sha(3)|sha(3)>, L<dgst(1)|dgst(1)> + +=head1 HISTORY + +EVP_SignInit(), EVP_SignUpdate() and EVP_SignFinal() are +available in all versions of SSLeay and OpenSSL. + +EVP_SignInit_ex() was added in OpenSSL 0.9.7. + +=cut |