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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" BIO_f_md, BIO_set_md, BIO_get_md, BIO_get_md_ctx \- message digest BIO filter .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 2 \& #include <openssl/bio.h> \& #include <openssl/evp.h> \& \& BIO_METHOD * BIO_f_md(void); \& int BIO_set_md(BIO *b,EVP_MD *md); \& int BIO_get_md(BIO *b,EVP_MD **mdp); \& int BIO_get_md_ctx(BIO *b,EVP_MD_CTX **mdcp); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBBIO_f_md()\fR returns the message digest \s-1BIO\s0 method. This is a filter \&\s-1BIO\s0 that digests any data passed through it, it is a \s-1BIO\s0 wrapper for the digest routines \fBEVP_DigestInit()\fR, \fBEVP_DigestUpdate()\fR and \fBEVP_DigestFinal()\fR. .PP Any data written or read through a digest \s-1BIO\s0 using \fBBIO_read()\fR and \&\fBBIO_write()\fR is digested. .PP \&\fBBIO_gets()\fR, if its \fBsize\fR parameter is large enough finishes the digest calculation and returns the digest value. \fBBIO_puts()\fR is not supported. .PP \&\fBBIO_reset()\fR reinitialises a digest \s-1BIO.\s0 .PP \&\fBBIO_set_md()\fR sets the message digest of \s-1BIO\s0 \fBb\fR to \fBmd\fR: this must be called to initialize a digest \s-1BIO\s0 before any data is passed through it. It is a \fBBIO_ctrl()\fR macro. .PP \&\fBBIO_get_md()\fR places the a pointer to the digest BIOs digest method in \fBmdp\fR, it is a \fBBIO_ctrl()\fR macro. .PP \&\fBBIO_get_md_ctx()\fR returns the digest BIOs context into \fBmdcp\fR. .\" Oracle has added the ARC stability level to this manual page .SH ATTRIBUTES See .BR attributes (7) for descriptions of the following attributes: .sp .TS box; cbp-1 | cbp-1 l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE = Availability library/security/openssl = Stability Pass-through uncommitted .TE .PP .SH "NOTES" .IX Header "NOTES" The context returned by \fBBIO_get_md_ctx()\fR can be used in calls to \fBEVP_DigestFinal()\fR and also the signature routines \fBEVP_SignFinal()\fR and \fBEVP_VerifyFinal()\fR. .PP The context returned by \fBBIO_get_md_ctx()\fR is an internal context structure. Changes made to this context will affect the digest \&\s-1BIO\s0 itself and the context pointer will become invalid when the digest \&\s-1BIO\s0 is freed. .PP After the digest has been retrieved from a digest \s-1BIO\s0 it must be reinitialized by calling \fBBIO_reset()\fR, or \fBBIO_set_md()\fR before any more data is passed through it. .PP If an application needs to call \fBBIO_gets()\fR or \fBBIO_puts()\fR through a chain containing digest BIOs then this can be done by prepending a buffering \s-1BIO.\s0 .PP Before OpenSSL 1.0.0 the call to \fBBIO_get_md_ctx()\fR would only work if the \s-1BIO\s0 had been initialized for example by calling \fBBIO_set_md()\fR ). In OpenSSL 1.0.0 and later the context is always returned and the \s-1BIO\s0 is state is set to initialized. This allows applications to initialize the context externally if the standard calls such as \fBBIO_set_md()\fR are not sufficiently flexible. .\" Oracle has added source availability information to this manual page Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source-code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from https://www.openssl.org/source/openssl-1.0.2zi.tar.gz. Further information about this software can be found on the open source community website at https://www.openssl.org/. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBIO_f_md()\fR returns the digest \s-1BIO\s0 method. .PP \&\fBBIO_set_md()\fR, \fBBIO_get_md()\fR and \fBBIO_md_ctx()\fR return 1 for success and 0 for failure. .SH "EXAMPLES" .IX Header "EXAMPLES" The following example creates a \s-1BIO\s0 chain containing an \s-1SHA1\s0 and \s-1MD5\s0 digest \s-1BIO\s0 and passes the string \*(L"Hello World\*(R" through it. Error checking has been omitted for clarity. .PP .Vb 10 \& BIO *bio, *mdtmp; \& char message[] = "Hello World"; \& bio = BIO_new(BIO_s_null()); \& mdtmp = BIO_new(BIO_f_md()); \& BIO_set_md(mdtmp, EVP_sha1()); \& /* For BIO_push() we want to append the sink BIO and keep a note of \& * the start of the chain. \& */ \& bio = BIO_push(mdtmp, bio); \& mdtmp = BIO_new(BIO_f_md()); \& BIO_set_md(mdtmp, EVP_md5()); \& bio = BIO_push(mdtmp, bio); \& /* Note: mdtmp can now be discarded */ \& BIO_write(bio, message, strlen(message)); .Ve .PP The next example digests data by reading through a chain instead: .PP .Vb 10 \& BIO *bio, *mdtmp; \& char buf[1024]; \& int rdlen; \& bio = BIO_new_file(file, "rb"); \& mdtmp = BIO_new(BIO_f_md()); \& BIO_set_md(mdtmp, EVP_sha1()); \& bio = BIO_push(mdtmp, bio); \& mdtmp = BIO_new(BIO_f_md()); \& BIO_set_md(mdtmp, EVP_md5()); \& bio = BIO_push(mdtmp, bio); \& do { \& rdlen = BIO_read(bio, buf, sizeof(buf)); \& /* Might want to do something with the data here */ \& } while(rdlen > 0); .Ve .PP This next example retrieves the message digests from a \s-1BIO\s0 chain and outputs them. This could be used with the examples above. .PP .Vb 10 \& BIO *mdtmp; \& unsigned char mdbuf[EVP_MAX_MD_SIZE]; \& int mdlen; \& int i; \& mdtmp = bio; /* Assume bio has previously been set up */ \& do { \& EVP_MD *md; \& mdtmp = BIO_find_type(mdtmp, BIO_TYPE_MD); \& if(!mdtmp) break; \& BIO_get_md(mdtmp, &md); \& printf("%s digest", OBJ_nid2sn(EVP_MD_type(md))); \& mdlen = BIO_gets(mdtmp, mdbuf, EVP_MAX_MD_SIZE); \& for(i = 0; i < mdlen; i++) printf(":%02X", mdbuf[i]); \& printf("\en"); \& mdtmp = BIO_next(mdtmp); \& } while(mdtmp); \& \& BIO_free_all(bio); .Ve .SH "BUGS" .IX Header "BUGS" The lack of support for \fBBIO_puts()\fR and the non standard behaviour of \&\fBBIO_gets()\fR could be regarded as anomalous. It could be argued that \fBBIO_gets()\fR and \fBBIO_puts()\fR should be passed to the next \s-1BIO\s0 in the chain and digest the data passed through and that digests should be retrieved using a separate \fBBIO_ctrl()\fR call. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\s-1TBA\s0