diff options
Diffstat (limited to 'openssl/doc/crypto/EVP_DigestInit.pod')
| -rw-r--r-- | openssl/doc/crypto/EVP_DigestInit.pod | 30 |
1 files changed, 17 insertions, 13 deletions
diff --git a/openssl/doc/crypto/EVP_DigestInit.pod b/openssl/doc/crypto/EVP_DigestInit.pod index 310c65eb3..ac526bb6d 100644 --- a/openssl/doc/crypto/EVP_DigestInit.pod +++ b/openssl/doc/crypto/EVP_DigestInit.pod @@ -26,13 +26,13 @@ EVP digest routines int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx); void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx); - int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out,const EVP_MD_CTX *in); + int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out,const EVP_MD_CTX *in); int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type); int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *s); - int EVP_MD_CTX_copy(EVP_MD_CTX *out,EVP_MD_CTX *in); + int EVP_MD_CTX_copy(EVP_MD_CTX *out,EVP_MD_CTX *in); #define EVP_MAX_MD_SIZE 64 /* SHA512 */ @@ -136,10 +136,10 @@ reasons. EVP_md2(), EVP_md5(), EVP_sha(), EVP_sha1(), EVP_sha224(), EVP_sha256(), EVP_sha384(), EVP_sha512(), EVP_mdc2() and EVP_ripemd160() return B<EVP_MD> structures for the MD2, MD5, SHA, SHA1, SHA224, SHA256, SHA384, SHA512, MDC2 -and RIPEMD160 digest algorithms respectively. +and RIPEMD160 digest algorithms respectively. EVP_dss() and EVP_dss1() return B<EVP_MD> structures for SHA and SHA1 digest -algorithms but using DSS (DSA) for the signature algorithm. Note: there is +algorithms but using DSS (DSA) for the signature algorithm. Note: there is no need to use these pseudo-digests in OpenSSL 1.0.0 and later, they are however retained for compatibility. @@ -177,21 +177,21 @@ The B<EVP> interface to message digests should almost always be used in preference to the low level interfaces. This is because the code then becomes transparent to the digest used and much more flexible. -New applications should use the SHA2 digest algorithms such as SHA256. +New applications should use the SHA2 digest algorithms such as SHA256. The other digest algorithms are still in common use. For most applications the B<impl> parameter to EVP_DigestInit_ex() will be set to NULL to use the default digest implementation. -The functions EVP_DigestInit(), EVP_DigestFinal() and EVP_MD_CTX_copy() are +The functions EVP_DigestInit(), EVP_DigestFinal() and EVP_MD_CTX_copy() are obsolete but are retained to maintain compatibility with existing code. New -applications should use EVP_DigestInit_ex(), EVP_DigestFinal_ex() and +applications should use EVP_DigestInit_ex(), EVP_DigestFinal_ex() and EVP_MD_CTX_copy_ex() because they can efficiently reuse a digest context instead of initializing and cleaning it up on each call and allow non default implementations of digests to be specified. In OpenSSL 0.9.7 and later if digest contexts are not cleaned up after use -memory leaks will occur. +memory leaks will occur. Stack allocation of EVP_MD_CTX structures is common, for example: @@ -245,15 +245,19 @@ digest name passed on the command line. EVP_MD_CTX_destroy(mdctx); printf("Digest is: "); - for(i = 0; i < md_len; i++) printf("%02x", md_value[i]); + for(i = 0; i < md_len; i++) + printf("%02x", md_value[i]); printf("\n"); + + /* Call this once before exit. */ + EVP_cleanup(); + exit(0); } =head1 SEE ALSO -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)> +L<dgst(1)|dgst(1)>, +L<evp(3)|evp(3)> =head1 HISTORY @@ -269,7 +273,7 @@ EVP_dss(), EVP_dss1(), EVP_mdc2() and EVP_ripemd160() were changed to return truely const EVP_MD * in OpenSSL 0.9.7. The link between digests and signing algorithms was fixed in OpenSSL 1.0 and -later, so now EVP_sha1() can be used with RSA and DSA, there is no need to +later, so now EVP_sha1() can be used with RSA and DSA; there is no need to use EVP_dss1() any more. OpenSSL 1.0 and later does not include the MD2 digest algorithm in the |