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Diffstat (limited to 'secure/lib/libcrypto/man/man3/EVP_DigestInit.3')
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diff --git a/secure/lib/libcrypto/man/man3/EVP_DigestInit.3 b/secure/lib/libcrypto/man/man3/EVP_DigestInit.3 new file mode 100644 index 000000000000..4b9e41e3d316 --- /dev/null +++ b/secure/lib/libcrypto/man/man3/EVP_DigestInit.3 @@ -0,0 +1,446 @@ +.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.39) +.\" +.\" 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" +EVP_MD_CTX_new, EVP_MD_CTX_reset, EVP_MD_CTX_free, EVP_MD_CTX_copy_ex, EVP_MD_CTX_ctrl, EVP_MD_CTX_set_flags, EVP_MD_CTX_clear_flags, EVP_MD_CTX_test_flags, EVP_DigestInit_ex, EVP_DigestInit, EVP_DigestUpdate, EVP_DigestFinal_ex, EVP_DigestFinalXOF, EVP_DigestFinal, EVP_MD_CTX_copy, EVP_MD_type, EVP_MD_pkey_type, EVP_MD_size, EVP_MD_block_size, EVP_MD_CTX_md, EVP_MD_CTX_size, EVP_MD_CTX_block_size, EVP_MD_CTX_type, EVP_MD_CTX_md_data, EVP_md_null, EVP_get_digestbyname, EVP_get_digestbynid, EVP_get_digestbyobj, EVP_MD_CTX_set_pkey_ctx \- EVP digest routines +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 1 +\& #include <openssl/evp.h> +\& +\& EVP_MD_CTX *EVP_MD_CTX_new(void); +\& int EVP_MD_CTX_reset(EVP_MD_CTX *ctx); +\& void EVP_MD_CTX_free(EVP_MD_CTX *ctx); +\& void EVP_MD_CTX_ctrl(EVP_MD_CTX *ctx, int cmd, int p1, void* p2); +\& void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, int flags); +\& void EVP_MD_CTX_clear_flags(EVP_MD_CTX *ctx, int flags); +\& int EVP_MD_CTX_test_flags(const EVP_MD_CTX *ctx, int flags); +\& +\& int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl); +\& int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *d, size_t cnt); +\& int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *s); +\& int EVP_DigestFinalXOF(EVP_MD_CTX *ctx, unsigned char *md, size_t len); +\& +\& 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_type(const EVP_MD *md); +\& int EVP_MD_pkey_type(const EVP_MD *md); +\& int EVP_MD_size(const EVP_MD *md); +\& int EVP_MD_block_size(const EVP_MD *md); +\& +\& const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx); +\& int EVP_MD_CTX_size(const EVP_MD *ctx); +\& int EVP_MD_CTX_block_size(const EVP_MD *ctx); +\& int EVP_MD_CTX_type(const EVP_MD *ctx); +\& void *EVP_MD_CTX_md_data(const EVP_MD_CTX *ctx); +\& +\& const EVP_MD *EVP_md_null(void); +\& +\& const EVP_MD *EVP_get_digestbyname(const char *name); +\& const EVP_MD *EVP_get_digestbynid(int type); +\& const EVP_MD *EVP_get_digestbyobj(const ASN1_OBJECT *o); +\& +\& void EVP_MD_CTX_set_pkey_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pctx); +.Ve +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +The \s-1EVP\s0 digest routines are a high level interface to message digests, +and should be used instead of the cipher-specific functions. +.IP "\fBEVP_MD_CTX_new()\fR" 4 +.IX Item "EVP_MD_CTX_new()" +Allocates and returns a digest context. +.IP "\fBEVP_MD_CTX_reset()\fR" 4 +.IX Item "EVP_MD_CTX_reset()" +Resets the digest context \fBctx\fR. This can be used to reuse an already +existing context. +.IP "\fBEVP_MD_CTX_free()\fR" 4 +.IX Item "EVP_MD_CTX_free()" +Cleans up digest context \fBctx\fR and frees up the space allocated to it. +.IP "\fBEVP_MD_CTX_ctrl()\fR" 4 +.IX Item "EVP_MD_CTX_ctrl()" +Performs digest-specific control actions on context \fBctx\fR. +.IP "\fBEVP_MD_CTX_set_flags()\fR, \fBEVP_MD_CTX_clear_flags()\fR, \fBEVP_MD_CTX_test_flags()\fR" 4 +.IX Item "EVP_MD_CTX_set_flags(), EVP_MD_CTX_clear_flags(), EVP_MD_CTX_test_flags()" +Sets, clears and tests \fBctx\fR flags. See \*(L"\s-1FLAGS\*(R"\s0 below for more information. +.IP "\fBEVP_DigestInit_ex()\fR" 4 +.IX Item "EVP_DigestInit_ex()" +Sets up digest context \fBctx\fR to use a digest \fBtype\fR from \s-1ENGINE\s0 \fBimpl\fR. +\&\fBtype\fR will typically be supplied by a function such as \fBEVP_sha1()\fR. If +\&\fBimpl\fR is \s-1NULL\s0 then the default implementation of digest \fBtype\fR is used. +.IP "\fBEVP_DigestUpdate()\fR" 4 +.IX Item "EVP_DigestUpdate()" +Hashes \fBcnt\fR bytes of data at \fBd\fR into the digest context \fBctx\fR. This +function can be called several times on the same \fBctx\fR to hash additional +data. +.IP "\fBEVP_DigestFinal_ex()\fR" 4 +.IX Item "EVP_DigestFinal_ex()" +Retrieves the digest value from \fBctx\fR and places it in \fBmd\fR. If the \fBs\fR +parameter is not \s-1NULL\s0 then the number of bytes of data written (i.e. the +length of the digest) will be written to the integer at \fBs\fR, at most +\&\fB\s-1EVP_MAX_MD_SIZE\s0\fR bytes will be written. After calling \fBEVP_DigestFinal_ex()\fR +no additional calls to \fBEVP_DigestUpdate()\fR can be made, but +\&\fBEVP_DigestInit_ex()\fR can be called to initialize a new digest operation. +.IP "\fBEVP_DigestFinalXOF()\fR" 4 +.IX Item "EVP_DigestFinalXOF()" +Interfaces to extendable-output functions, XOFs, such as \s-1SHAKE128\s0 and \s-1SHAKE256.\s0 +It retrieves the digest value from \fBctx\fR and places it in \fBlen\fR\-sized <B>md. +After calling this function no additional calls to \fBEVP_DigestUpdate()\fR can be +made, but \fBEVP_DigestInit_ex()\fR can be called to initialize a new operation. +.IP "\fBEVP_MD_CTX_copy_ex()\fR" 4 +.IX Item "EVP_MD_CTX_copy_ex()" +Can be used to copy the message digest state from \fBin\fR to \fBout\fR. This is +useful if large amounts of data are to be hashed which only differ in the last +few bytes. +.IP "\fBEVP_DigestInit()\fR" 4 +.IX Item "EVP_DigestInit()" +Behaves in the same way as \fBEVP_DigestInit_ex()\fR except it always uses the +default digest implementation. +.IP "\fBEVP_DigestFinal()\fR" 4 +.IX Item "EVP_DigestFinal()" +Similar to \fBEVP_DigestFinal_ex()\fR except the digest context \fBctx\fR is +automatically cleaned up. +.IP "\fBEVP_MD_CTX_copy()\fR" 4 +.IX Item "EVP_MD_CTX_copy()" +Similar to \fBEVP_MD_CTX_copy_ex()\fR except the destination \fBout\fR does not have to +be initialized. +.IP "\fBEVP_MD_size()\fR, \fBEVP_MD_CTX_size()\fR" 4 +.IX Item "EVP_MD_size(), EVP_MD_CTX_size()" +Return the size of the message digest when passed an \fB\s-1EVP_MD\s0\fR or an +\&\fB\s-1EVP_MD_CTX\s0\fR structure, i.e. the size of the hash. +.IP "\fBEVP_MD_block_size()\fR, \fBEVP_MD_CTX_block_size()\fR" 4 +.IX Item "EVP_MD_block_size(), EVP_MD_CTX_block_size()" +Return the block size of the message digest when passed an \fB\s-1EVP_MD\s0\fR or an +\&\fB\s-1EVP_MD_CTX\s0\fR structure. +.IP "\fBEVP_MD_type()\fR, \fBEVP_MD_CTX_type()\fR" 4 +.IX Item "EVP_MD_type(), EVP_MD_CTX_type()" +Return the \s-1NID\s0 of the \s-1OBJECT IDENTIFIER\s0 representing the given message digest +when passed an \fB\s-1EVP_MD\s0\fR structure. For example, \f(CW\*(C`EVP_MD_type(EVP_sha1())\*(C'\fR +returns \fBNID_sha1\fR. This function is normally used when setting \s-1ASN1\s0 OIDs. +.IP "\fBEVP_MD_CTX_md_data()\fR" 4 +.IX Item "EVP_MD_CTX_md_data()" +Return the digest method private data for the passed \fB\s-1EVP_MD_CTX\s0\fR. +The space is allocated by OpenSSL and has the size originally set with +\&\fBEVP_MD_meth_set_app_datasize()\fR. +.IP "\fBEVP_MD_CTX_md()\fR" 4 +.IX Item "EVP_MD_CTX_md()" +Returns the \fB\s-1EVP_MD\s0\fR structure corresponding to the passed \fB\s-1EVP_MD_CTX\s0\fR. +.IP "\fBEVP_MD_pkey_type()\fR" 4 +.IX Item "EVP_MD_pkey_type()" +Returns the \s-1NID\s0 of the public key signing algorithm associated with this +digest. For example \fBEVP_sha1()\fR is associated with \s-1RSA\s0 so this will return +\&\fBNID_sha1WithRSAEncryption\fR. Since digests and signature algorithms are no +longer linked this function is only retained for compatibility reasons. +.IP "\fBEVP_md_null()\fR" 4 +.IX Item "EVP_md_null()" +A \*(L"null\*(R" message digest that does nothing: i.e. the hash it returns is of zero +length. +.IP "\fBEVP_get_digestbyname()\fR, \fBEVP_get_digestbynid()\fR, \fBEVP_get_digestbyobj()\fR" 4 +.IX Item "EVP_get_digestbyname(), EVP_get_digestbynid(), EVP_get_digestbyobj()" +Returns an \fB\s-1EVP_MD\s0\fR structure when passed a digest name, a digest \fB\s-1NID\s0\fR or an +\&\fB\s-1ASN1_OBJECT\s0\fR structure respectively. +.IP "\fBEVP_MD_CTX_set_pkey_ctx()\fR" 4 +.IX Item "EVP_MD_CTX_set_pkey_ctx()" +Assigns an \fB\s-1EVP_PKEY_CTX\s0\fR to \fB\s-1EVP_MD_CTX\s0\fR. This is usually used to provide +a customzied \fB\s-1EVP_PKEY_CTX\s0\fR to \fBEVP_DigestSignInit\fR\|(3) or +\&\fBEVP_DigestVerifyInit\fR\|(3). The \fBpctx\fR passed to this function should be freed +by the caller. A \s-1NULL\s0 \fBpctx\fR pointer is also allowed to clear the \fB\s-1EVP_PKEY_CTX\s0\fR +assigned to \fBctx\fR. In such case, freeing the cleared \fB\s-1EVP_PKEY_CTX\s0\fR or not +depends on how the \fB\s-1EVP_PKEY_CTX\s0\fR is created. +.SH "FLAGS" +.IX Header "FLAGS" +\&\fBEVP_MD_CTX_set_flags()\fR, \fBEVP_MD_CTX_clear_flags()\fR and \fBEVP_MD_CTX_test_flags()\fR +can be used the manipulate and test these \fB\s-1EVP_MD_CTX\s0\fR flags: +.IP "\s-1EVP_MD_CTX_FLAG_ONESHOT\s0" 4 +.IX Item "EVP_MD_CTX_FLAG_ONESHOT" +This flag instructs the digest to optimize for one update only, if possible. +.IP "\s-1EVP_MD_CTX_FLAG_NO_INIT\s0" 4 +.IX Item "EVP_MD_CTX_FLAG_NO_INIT" +This flag instructs \fBEVP_DigestInit()\fR and similar not to initialise the +implementation specific data. +.IP "\s-1EVP_MD_CTX_FLAG_FINALISE\s0" 4 +.IX Item "EVP_MD_CTX_FLAG_FINALISE" +Some functions such as EVP_DigestSign only finalise copies of internal +contexts so additional data can be included after the finalisation call. +This is inefficient if this functionality is not required, and can be +disabled with this flag. +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +.IP "\fBEVP_DigestInit_ex()\fR, \fBEVP_DigestUpdate()\fR, \fBEVP_DigestFinal_ex()\fR" 4 +.IX Item "EVP_DigestInit_ex(), EVP_DigestUpdate(), EVP_DigestFinal_ex()" +Returns 1 for +success and 0 for failure. +.IP "\fBEVP_MD_CTX_ctrl()\fR" 4 +.IX Item "EVP_MD_CTX_ctrl()" +Returns 1 if successful or 0 for failure. +.IP "\fBEVP_MD_CTX_copy_ex()\fR" 4 +.IX Item "EVP_MD_CTX_copy_ex()" +Returns 1 if successful or 0 for failure. +.IP "\fBEVP_MD_type()\fR, \fBEVP_MD_pkey_type()\fR, \fBEVP_MD_type()\fR" 4 +.IX Item "EVP_MD_type(), EVP_MD_pkey_type(), EVP_MD_type()" +Returns the \s-1NID\s0 of the corresponding \s-1OBJECT IDENTIFIER\s0 or NID_undef if none +exists. +.IP "\fBEVP_MD_size()\fR, \fBEVP_MD_block_size()\fR, \fBEVP_MD_CTX_size()\fR, \fBEVP_MD_CTX_block_size()\fR" 4 +.IX Item "EVP_MD_size(), EVP_MD_block_size(), EVP_MD_CTX_size(), EVP_MD_CTX_block_size()" +Returns the digest or block size in bytes. +.IP "\fBEVP_md_null()\fR" 4 +.IX Item "EVP_md_null()" +Returns a pointer to the \fB\s-1EVP_MD\s0\fR structure of the \*(L"null\*(R" message digest. +.IP "\fBEVP_get_digestbyname()\fR, \fBEVP_get_digestbynid()\fR, \fBEVP_get_digestbyobj()\fR" 4 +.IX Item "EVP_get_digestbyname(), EVP_get_digestbynid(), EVP_get_digestbyobj()" +Returns either an \fB\s-1EVP_MD\s0\fR structure or \s-1NULL\s0 if an error occurs. +.IP "\fBEVP_MD_CTX_set_pkey_ctx()\fR" 4 +.IX Item "EVP_MD_CTX_set_pkey_ctx()" +This function has no return value. +.SH "NOTES" +.IX Header "NOTES" +The \fB\s-1EVP\s0\fR 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. +.PP +New applications should use the \s-1SHA\-2\s0 (such as \fBEVP_sha256\fR\|(3)) or the \s-1SHA\-3\s0 +digest algorithms (such as \fBEVP_sha3_512\fR\|(3)). The other digest algorithms +are still in common use. +.PP +For most applications the \fBimpl\fR parameter to \fBEVP_DigestInit_ex()\fR will be +set to \s-1NULL\s0 to use the default digest implementation. +.PP +The functions \fBEVP_DigestInit()\fR, \fBEVP_DigestFinal()\fR and \fBEVP_MD_CTX_copy()\fR are +obsolete but are retained to maintain compatibility with existing code. New +applications should use \fBEVP_DigestInit_ex()\fR, \fBEVP_DigestFinal_ex()\fR and +\&\fBEVP_MD_CTX_copy_ex()\fR 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. +.PP +If digest contexts are not cleaned up after use, +memory leaks will occur. +.PP +\&\fBEVP_MD_CTX_size()\fR, \fBEVP_MD_CTX_block_size()\fR, \fBEVP_MD_CTX_type()\fR, +\&\fBEVP_get_digestbynid()\fR and \fBEVP_get_digestbyobj()\fR are defined as +macros. +.PP +\&\fBEVP_MD_CTX_ctrl()\fR sends commands to message digests for additional configuration +or control. +.SH "EXAMPLES" +.IX Header "EXAMPLES" +This example digests the data \*(L"Test Message\en\*(R" and \*(L"Hello World\en\*(R", using the +digest name passed on the command line. +.PP +.Vb 3 +\& #include <stdio.h> +\& #include <string.h> +\& #include <openssl/evp.h> +\& +\& int main(int argc, char *argv[]) +\& { +\& EVP_MD_CTX *mdctx; +\& const EVP_MD *md; +\& char mess1[] = "Test Message\en"; +\& char mess2[] = "Hello World\en"; +\& unsigned char md_value[EVP_MAX_MD_SIZE]; +\& unsigned int md_len, i; +\& +\& if (argv[1] == NULL) { +\& printf("Usage: mdtest digestname\en"); +\& exit(1); +\& } +\& +\& md = EVP_get_digestbyname(argv[1]); +\& if (md == NULL) { +\& printf("Unknown message digest %s\en", argv[1]); +\& exit(1); +\& } +\& +\& mdctx = EVP_MD_CTX_new(); +\& EVP_DigestInit_ex(mdctx, md, NULL); +\& EVP_DigestUpdate(mdctx, mess1, strlen(mess1)); +\& EVP_DigestUpdate(mdctx, mess2, strlen(mess2)); +\& EVP_DigestFinal_ex(mdctx, md_value, &md_len); +\& EVP_MD_CTX_free(mdctx); +\& +\& printf("Digest is: "); +\& for (i = 0; i < md_len; i++) +\& printf("%02x", md_value[i]); +\& printf("\en"); +\& +\& exit(0); +\& } +.Ve +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\fBdgst\fR\|(1), +\&\fBevp\fR\|(7) +.PP +The full list of digest algorithms are provided below. +.PP +\&\fBEVP_blake2b512\fR\|(3), +\&\fBEVP_md2\fR\|(3), +\&\fBEVP_md4\fR\|(3), +\&\fBEVP_md5\fR\|(3), +\&\fBEVP_mdc2\fR\|(3), +\&\fBEVP_ripemd160\fR\|(3), +\&\fBEVP_sha1\fR\|(3), +\&\fBEVP_sha224\fR\|(3), +\&\fBEVP_sha3_224\fR\|(3), +\&\fBEVP_sm3\fR\|(3), +\&\fBEVP_whirlpool\fR\|(3) +.SH "HISTORY" +.IX Header "HISTORY" +The \fBEVP_MD_CTX_create()\fR and \fBEVP_MD_CTX_destroy()\fR functions were renamed to +\&\fBEVP_MD_CTX_new()\fR and \fBEVP_MD_CTX_free()\fR in OpenSSL 1.1.0, respectively. +.PP +The link between digests and signing algorithms was fixed in OpenSSL 1.0 and +later, so now \fBEVP_sha1()\fR can be used with \s-1RSA\s0 and \s-1DSA.\s0 +.PP +The \fBEVP_dss1()\fR function was removed in OpenSSL 1.1.0. +.PP +The \fBEVP_MD_CTX_set_pkey_ctx()\fR function was added in 1.1.1. +.SH "COPYRIGHT" +.IX Header "COPYRIGHT" +Copyright 2000\-2019 The OpenSSL Project Authors. All Rights Reserved. +.PP +Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use +this file except in compliance with the License. You can obtain a copy +in the file \s-1LICENSE\s0 in the source distribution or at +<https://www.openssl.org/source/license.html>. |