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.\" Automatically generated by Pod::Man 2.27 (Pod::Simple 3.28) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \(-- will .\" give an unbreakable dash, \(PI will give pi, \(L" will give a left .\" double quote, and \(R" will give a right double quote. \(C+ will .\" give a nicer C++. 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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" \&\fIBIO_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 \fIEVP_DigestInit()\fR, \fIEVP_DigestUpdate()\fR and \fIEVP_DigestFinal()\fR. .PP Any data written or read through a digest \s-1BIO\s0 using \fIBIO_read()\fR and \&\fIBIO_write()\fR is digested. .PP \&\fIBIO_gets()\fR, if its \fBsize\fR parameter is large enough finishes the digest calculation and returns the digest value. \fIBIO_puts()\fR is not supported. .PP \&\fIBIO_reset()\fR reinitialises a digest \s-1BIO.\s0 .PP \&\fIBIO_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 \fIBIO_ctrl()\fR macro. .PP \&\fIBIO_get_md()\fR places the a pointer to the digest BIOs digest method in \fBmdp\fR, it is a \fIBIO_ctrl()\fR macro. .PP \&\fIBIO_get_md_ctx()\fR returns the digest BIOs context into \fBmdcp\fR. .SH "NOTES" .IX Header "NOTES" The context returned by \fIBIO_get_md_ctx()\fR can be used in calls to \fIEVP_DigestFinal()\fR and also the signature routines \fIEVP_SignFinal()\fR and \fIEVP_VerifyFinal()\fR. .PP The context returned by \fIBIO_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 \fIBIO_reset()\fR, or \fIBIO_set_md()\fR before any more data is passed through it. .PP If an application needs to call \fIBIO_gets()\fR or \fIBIO_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 \fIBIO_get_md_ctx()\fR would only work if the \s-1BIO\s0 had been initialized for example by calling \fIBIO_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 \fIBIO_set_md()\fR are not sufficiently flexible. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fIBIO_f_md()\fR returns the digest \s-1BIO\s0 method. .PP \&\fIBIO_set_md()\fR, \fIBIO_get_md()\fR and \fIBIO_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 \fIBIO_puts()\fR and the non standard behaviour of \&\fIBIO_gets()\fR could be regarded as anomalous. It could be argued that \fIBIO_gets()\fR and \fIBIO_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 \fIBIO_ctrl()\fR call. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\s-1TBA\s0

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