824 lines
38 KiB
Plaintext
824 lines
38 KiB
Plaintext
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.\" ========================================================================
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.\"
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.IX Title "EVP_DIGESTINIT 3ossl"
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.TH EVP_DIGESTINIT 3ossl "2024-01-30" "3.2.1" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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EVP_MD_fetch, EVP_MD_up_ref, EVP_MD_free,
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EVP_MD_get_params, EVP_MD_gettable_params,
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EVP_MD_CTX_new, EVP_MD_CTX_reset, EVP_MD_CTX_free, EVP_MD_CTX_dup,
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EVP_MD_CTX_copy, EVP_MD_CTX_copy_ex, EVP_MD_CTX_ctrl,
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EVP_MD_CTX_set_params, EVP_MD_CTX_get_params,
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EVP_MD_settable_ctx_params, EVP_MD_gettable_ctx_params,
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EVP_MD_CTX_settable_params, EVP_MD_CTX_gettable_params,
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EVP_MD_CTX_set_flags, EVP_MD_CTX_clear_flags, EVP_MD_CTX_test_flags,
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EVP_Q_digest, EVP_Digest, EVP_DigestInit_ex2, EVP_DigestInit_ex, EVP_DigestInit,
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EVP_DigestUpdate, EVP_DigestFinal_ex, EVP_DigestFinalXOF, EVP_DigestFinal,
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EVP_MD_is_a, EVP_MD_get0_name, EVP_MD_get0_description,
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EVP_MD_names_do_all, EVP_MD_get0_provider, EVP_MD_get_type,
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EVP_MD_get_pkey_type, EVP_MD_get_size, EVP_MD_get_block_size, EVP_MD_get_flags,
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EVP_MD_CTX_get0_name, EVP_MD_CTX_md, EVP_MD_CTX_get0_md, EVP_MD_CTX_get1_md,
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EVP_MD_CTX_get_type, EVP_MD_CTX_get_size, EVP_MD_CTX_get_block_size,
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EVP_MD_CTX_get0_md_data, EVP_MD_CTX_update_fn, EVP_MD_CTX_set_update_fn,
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EVP_md_null,
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EVP_get_digestbyname, EVP_get_digestbynid, EVP_get_digestbyobj,
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EVP_MD_CTX_get_pkey_ctx, EVP_MD_CTX_set_pkey_ctx,
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EVP_MD_do_all_provided,
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EVP_MD_type, EVP_MD_nid, EVP_MD_name, EVP_MD_pkey_type, EVP_MD_size,
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EVP_MD_block_size, EVP_MD_flags, EVP_MD_CTX_size, EVP_MD_CTX_block_size,
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EVP_MD_CTX_type, EVP_MD_CTX_pkey_ctx, EVP_MD_CTX_md_data
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\&\- EVP digest routines
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/evp.h>
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\&
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\& EVP_MD *EVP_MD_fetch(OSSL_LIB_CTX *ctx, const char *algorithm,
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\& const char *properties);
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\& int EVP_MD_up_ref(EVP_MD *md);
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\& void EVP_MD_free(EVP_MD *md);
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\& int EVP_MD_get_params(const EVP_MD *digest, OSSL_PARAM params[]);
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\& const OSSL_PARAM *EVP_MD_gettable_params(const EVP_MD *digest);
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\& EVP_MD_CTX *EVP_MD_CTX_new(void);
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\& int EVP_MD_CTX_reset(EVP_MD_CTX *ctx);
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\& void EVP_MD_CTX_free(EVP_MD_CTX *ctx);
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\& void EVP_MD_CTX_ctrl(EVP_MD_CTX *ctx, int cmd, int p1, void* p2);
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\& int EVP_MD_CTX_get_params(EVP_MD_CTX *ctx, OSSL_PARAM params[]);
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\& int EVP_MD_CTX_set_params(EVP_MD_CTX *ctx, const OSSL_PARAM params[]);
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\& const OSSL_PARAM *EVP_MD_settable_ctx_params(const EVP_MD *md);
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\& const OSSL_PARAM *EVP_MD_gettable_ctx_params(const EVP_MD *md);
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\& const OSSL_PARAM *EVP_MD_CTX_settable_params(EVP_MD_CTX *ctx);
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\& const OSSL_PARAM *EVP_MD_CTX_gettable_params(EVP_MD_CTX *ctx);
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\& void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, int flags);
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\& void EVP_MD_CTX_clear_flags(EVP_MD_CTX *ctx, int flags);
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\& int EVP_MD_CTX_test_flags(const EVP_MD_CTX *ctx, int flags);
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\&
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\& int EVP_Q_digest(OSSL_LIB_CTX *libctx, const char *name, const char *propq,
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\& const void *data, size_t datalen,
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\& unsigned char *md, size_t *mdlen);
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\& int EVP_Digest(const void *data, size_t count, unsigned char *md,
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\& unsigned int *size, const EVP_MD *type, ENGINE *impl);
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\& int EVP_DigestInit_ex2(EVP_MD_CTX *ctx, const EVP_MD *type,
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\& const OSSL_PARAM params[]);
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\& int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl);
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\& int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *d, size_t cnt);
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\& int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *s);
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\& int EVP_DigestFinalXOF(EVP_MD_CTX *ctx, unsigned char *md, size_t len);
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\&
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\& EVP_MD_CTX *EVP_MD_CTX_dup(const EVP_MD_CTX *in);
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\& int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in);
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\&
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\& int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type);
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\& int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *s);
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\&
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\& int EVP_MD_CTX_copy(EVP_MD_CTX *out, EVP_MD_CTX *in);
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\&
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\& const char *EVP_MD_get0_name(const EVP_MD *md);
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\& const char *EVP_MD_get0_description(const EVP_MD *md);
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\& int EVP_MD_is_a(const EVP_MD *md, const char *name);
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\& int EVP_MD_names_do_all(const EVP_MD *md,
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\& void (*fn)(const char *name, void *data),
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\& void *data);
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\& const OSSL_PROVIDER *EVP_MD_get0_provider(const EVP_MD *md);
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\& int EVP_MD_get_type(const EVP_MD *md);
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\& int EVP_MD_get_pkey_type(const EVP_MD *md);
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\& int EVP_MD_get_size(const EVP_MD *md);
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\& int EVP_MD_get_block_size(const EVP_MD *md);
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\& unsigned long EVP_MD_get_flags(const EVP_MD *md);
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\&
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\& const EVP_MD *EVP_MD_CTX_get0_md(const EVP_MD_CTX *ctx);
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\& EVP_MD *EVP_MD_CTX_get1_md(EVP_MD_CTX *ctx);
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\& const char *EVP_MD_CTX_get0_name(const EVP_MD_CTX *ctx);
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\& int EVP_MD_CTX_get_size(const EVP_MD_CTX *ctx);
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\& int EVP_MD_CTX_get_block_size(const EVP_MD_CTX *ctx);
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\& int EVP_MD_CTX_get_type(const EVP_MD_CTX *ctx);
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\& void *EVP_MD_CTX_get0_md_data(const EVP_MD_CTX *ctx);
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\&
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\& const EVP_MD *EVP_md_null(void);
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\&
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\& const EVP_MD *EVP_get_digestbyname(const char *name);
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\& const EVP_MD *EVP_get_digestbynid(int type);
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\& const EVP_MD *EVP_get_digestbyobj(const ASN1_OBJECT *o);
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\&
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\& EVP_PKEY_CTX *EVP_MD_CTX_get_pkey_ctx(const EVP_MD_CTX *ctx);
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\& void EVP_MD_CTX_set_pkey_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pctx);
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\&
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\& void EVP_MD_do_all_provided(OSSL_LIB_CTX *libctx,
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\& void (*fn)(EVP_MD *mac, void *arg),
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\& void *arg);
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\&
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\& #define EVP_MD_type EVP_MD_get_type
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\& #define EVP_MD_nid EVP_MD_get_type
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\& #define EVP_MD_name EVP_MD_get0_name
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\& #define EVP_MD_pkey_type EVP_MD_get_pkey_type
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\& #define EVP_MD_size EVP_MD_get_size
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\& #define EVP_MD_block_size EVP_MD_get_block_size
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\& #define EVP_MD_flags EVP_MD_get_flags
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\& #define EVP_MD_CTX_size EVP_MD_CTX_get_size
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\& #define EVP_MD_CTX_block_size EVP_MD_CTX_get_block_size
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\& #define EVP_MD_CTX_type EVP_MD_CTX_get_type
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\& #define EVP_MD_CTX_pkey_ctx EVP_MD_CTX_get_pkey_ctx
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\& #define EVP_MD_CTX_md_data EVP_MD_CTX_get0_md_data
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.Ve
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.PP
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The following functions have been deprecated since OpenSSL 3.0, and can be
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hidden entirely by defining \fB\s-1OPENSSL_API_COMPAT\s0\fR with a suitable version value,
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see \fIopenssl_user_macros\fR\|(7):
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.PP
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.Vb 1
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\& const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx);
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\&
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\& int (*EVP_MD_CTX_update_fn(EVP_MD_CTX *ctx))(EVP_MD_CTX *ctx,
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\& const void *data, size_t count);
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\&
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\& void EVP_MD_CTX_set_update_fn(EVP_MD_CTX *ctx,
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||
|
|
\& int (*update)(EVP_MD_CTX *ctx,
|
||
|
|
\& const void *data, size_t count));
|
||
|
|
.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 digest-specific functions.
|
||
|
|
.PP
|
||
|
|
The \fB\s-1EVP_MD\s0\fR type is a structure for digest method implementation.
|
||
|
|
.IP "\fIEVP_MD_fetch()\fR" 4
|
||
|
|
.IX Item "EVP_MD_fetch()"
|
||
|
|
Fetches the digest implementation for the given \fIalgorithm\fR from any
|
||
|
|
provider offering it, within the criteria given by the \fIproperties\fR.
|
||
|
|
See \*(L"\s-1ALGORITHM FETCHING\*(R"\s0 in \fIcrypto\fR\|(7) for further information.
|
||
|
|
.Sp
|
||
|
|
The returned value must eventually be freed with \fIEVP_MD_free()\fR.
|
||
|
|
.Sp
|
||
|
|
Fetched \fB\s-1EVP_MD\s0\fR structures are reference counted.
|
||
|
|
.IP "\fIEVP_MD_up_ref()\fR" 4
|
||
|
|
.IX Item "EVP_MD_up_ref()"
|
||
|
|
Increments the reference count for an \fB\s-1EVP_MD\s0\fR structure.
|
||
|
|
.IP "\fIEVP_MD_free()\fR" 4
|
||
|
|
.IX Item "EVP_MD_free()"
|
||
|
|
Decrements the reference count for the fetched \fB\s-1EVP_MD\s0\fR structure.
|
||
|
|
If the reference count drops to 0 then the structure is freed.
|
||
|
|
.IP "\fIEVP_MD_CTX_new()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_new()"
|
||
|
|
Allocates and returns a digest context.
|
||
|
|
.IP "\fIEVP_MD_CTX_reset()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_reset()"
|
||
|
|
Resets the digest context \fIctx\fR. This can be used to reuse an already
|
||
|
|
existing context.
|
||
|
|
.IP "\fIEVP_MD_CTX_free()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_free()"
|
||
|
|
Cleans up digest context \fIctx\fR and frees up the space allocated to it.
|
||
|
|
.IP "\fIEVP_MD_CTX_ctrl()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_ctrl()"
|
||
|
|
\&\fIThis is a legacy method. \fIEVP_MD_CTX_set_params()\fI and \fIEVP_MD_CTX_get_params()\fI
|
||
|
|
is the mechanism that should be used to set and get parameters that are used by
|
||
|
|
providers.\fR
|
||
|
|
.Sp
|
||
|
|
Performs digest-specific control actions on context \fIctx\fR. The control command
|
||
|
|
is indicated in \fIcmd\fR and any additional arguments in \fIp1\fR and \fIp2\fR.
|
||
|
|
\&\fIEVP_MD_CTX_ctrl()\fR must be called after \fIEVP_DigestInit_ex2()\fR. Other restrictions
|
||
|
|
may apply depending on the control type and digest implementation.
|
||
|
|
.Sp
|
||
|
|
If this function happens to be used with a fetched \fB\s-1EVP_MD\s0\fR, it will
|
||
|
|
translate the controls that are known to OpenSSL into \s-1\fIOSSL_PARAM\s0\fR\|(3)
|
||
|
|
parameters with keys defined by OpenSSL and call \fIEVP_MD_CTX_get_params()\fR or
|
||
|
|
\&\fIEVP_MD_CTX_set_params()\fR as is appropriate for each control command.
|
||
|
|
.Sp
|
||
|
|
See \*(L"\s-1CONTROLS\*(R"\s0 below for more information, including what translations are
|
||
|
|
being done.
|
||
|
|
.IP "\fIEVP_MD_get_params()\fR" 4
|
||
|
|
.IX Item "EVP_MD_get_params()"
|
||
|
|
Retrieves the requested list of \fIparams\fR from a \s-1MD \s0\fImd\fR.
|
||
|
|
See \*(L"\s-1PARAMETERS\*(R"\s0 below for more information.
|
||
|
|
.IP "\fIEVP_MD_CTX_get_params()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_get_params()"
|
||
|
|
Retrieves the requested list of \fIparams\fR from a \s-1MD\s0 context \fIctx\fR.
|
||
|
|
See \*(L"\s-1PARAMETERS\*(R"\s0 below for more information.
|
||
|
|
.IP "\fIEVP_MD_CTX_set_params()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_set_params()"
|
||
|
|
Sets the list of \fIparams\fR into a \s-1MD\s0 context \fIctx\fR.
|
||
|
|
See \*(L"\s-1PARAMETERS\*(R"\s0 below for more information.
|
||
|
|
.IP "\fIEVP_MD_gettable_params()\fR" 4
|
||
|
|
.IX Item "EVP_MD_gettable_params()"
|
||
|
|
Get a constant \s-1\fIOSSL_PARAM\s0\fR\|(3) array that describes the retrievable parameters
|
||
|
|
that can be used with \fIEVP_MD_get_params()\fR.
|
||
|
|
.IP "\fIEVP_MD_gettable_ctx_params()\fR, \fIEVP_MD_CTX_gettable_params()\fR" 4
|
||
|
|
.IX Item "EVP_MD_gettable_ctx_params(), EVP_MD_CTX_gettable_params()"
|
||
|
|
Get a constant \s-1\fIOSSL_PARAM\s0\fR\|(3) array that describes the retrievable parameters
|
||
|
|
that can be used with \fIEVP_MD_CTX_get_params()\fR. \fIEVP_MD_gettable_ctx_params()\fR
|
||
|
|
returns the parameters that can be retrieved from the algorithm, whereas
|
||
|
|
\&\fIEVP_MD_CTX_gettable_params()\fR returns the parameters that can be retrieved
|
||
|
|
in the context's current state.
|
||
|
|
.IP "\fIEVP_MD_settable_ctx_params()\fR, \fIEVP_MD_CTX_settable_params()\fR" 4
|
||
|
|
.IX Item "EVP_MD_settable_ctx_params(), EVP_MD_CTX_settable_params()"
|
||
|
|
Get a constant \s-1\fIOSSL_PARAM\s0\fR\|(3) array that describes the settable parameters
|
||
|
|
that can be used with \fIEVP_MD_CTX_set_params()\fR. \fIEVP_MD_settable_ctx_params()\fR
|
||
|
|
returns the parameters that can be set from the algorithm, whereas
|
||
|
|
\&\fIEVP_MD_CTX_settable_params()\fR returns the parameters that can be set in the
|
||
|
|
context's current state.
|
||
|
|
.IP "\fIEVP_MD_CTX_set_flags()\fR, \fIEVP_MD_CTX_clear_flags()\fR, \fIEVP_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 \fIctx\fR flags. See \*(L"\s-1FLAGS\*(R"\s0 below for more information.
|
||
|
|
.IP "\fIEVP_Q_digest()\fR is a quick one-shot digest function." 4
|
||
|
|
.IX Item "EVP_Q_digest() is a quick one-shot digest function."
|
||
|
|
It hashes \fIdatalen\fR bytes of data at \fIdata\fR using the digest algorithm
|
||
|
|
\&\fIname\fR, which is fetched using the optional \fIlibctx\fR and \fIpropq\fR parameters.
|
||
|
|
The digest value is placed in \fImd\fR and its length is written at \fImdlen\fR
|
||
|
|
if the pointer is not \s-1NULL.\s0 At most \fB\s-1EVP_MAX_MD_SIZE\s0\fR bytes will be written.
|
||
|
|
.IP "\fIEVP_Digest()\fR" 4
|
||
|
|
.IX Item "EVP_Digest()"
|
||
|
|
A wrapper around the Digest Init_ex, Update and Final_ex functions.
|
||
|
|
Hashes \fIcount\fR bytes of data at \fIdata\fR using a digest \fItype\fR from \s-1ENGINE
|
||
|
|
\&\s0\fIimpl\fR. The digest value is placed in \fImd\fR and its length is written at \fIsize\fR
|
||
|
|
if the pointer is not \s-1NULL.\s0 At most \fB\s-1EVP_MAX_MD_SIZE\s0\fR bytes will be written.
|
||
|
|
If \fIimpl\fR is \s-1NULL\s0 the default implementation of digest \fItype\fR is used.
|
||
|
|
.IP "\fIEVP_DigestInit_ex2()\fR" 4
|
||
|
|
.IX Item "EVP_DigestInit_ex2()"
|
||
|
|
Sets up digest context \fIctx\fR to use a digest \fItype\fR.
|
||
|
|
\&\fItype\fR is typically supplied by a function such as \fIEVP_sha1()\fR, or a
|
||
|
|
value explicitly fetched with \fIEVP_MD_fetch()\fR.
|
||
|
|
.Sp
|
||
|
|
The parameters \fBparams\fR are set on the context after initialisation.
|
||
|
|
.Sp
|
||
|
|
The \fItype\fR parameter can be \s-1NULL\s0 if \fIctx\fR has been already initialized
|
||
|
|
with another \fIEVP_DigestInit_ex()\fR call and has not been reset with
|
||
|
|
\&\fIEVP_MD_CTX_reset()\fR.
|
||
|
|
.IP "\fIEVP_DigestInit_ex()\fR" 4
|
||
|
|
.IX Item "EVP_DigestInit_ex()"
|
||
|
|
Sets up digest context \fIctx\fR to use a digest \fItype\fR.
|
||
|
|
\&\fItype\fR is typically supplied by a function such as \fIEVP_sha1()\fR, or a
|
||
|
|
value explicitly fetched with \fIEVP_MD_fetch()\fR.
|
||
|
|
.Sp
|
||
|
|
If \fIimpl\fR is non-NULL, its implementation of the digest \fItype\fR is used if
|
||
|
|
there is one, and if not, the default implementation is used.
|
||
|
|
.Sp
|
||
|
|
The \fItype\fR parameter can be \s-1NULL\s0 if \fIctx\fR has been already initialized
|
||
|
|
with another \fIEVP_DigestInit_ex()\fR call and has not been reset with
|
||
|
|
\&\fIEVP_MD_CTX_reset()\fR.
|
||
|
|
.IP "\fIEVP_DigestUpdate()\fR" 4
|
||
|
|
.IX Item "EVP_DigestUpdate()"
|
||
|
|
Hashes \fIcnt\fR bytes of data at \fId\fR into the digest context \fIctx\fR. This
|
||
|
|
function can be called several times on the same \fIctx\fR to hash additional
|
||
|
|
data.
|
||
|
|
.IP "\fIEVP_DigestFinal_ex()\fR" 4
|
||
|
|
.IX Item "EVP_DigestFinal_ex()"
|
||
|
|
Retrieves the digest value from \fIctx\fR and places it in \fImd\fR. If the \fIs\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 \fIs\fR, at most
|
||
|
|
\&\fB\s-1EVP_MAX_MD_SIZE\s0\fR bytes will be written unless the digest implementation
|
||
|
|
allows changing the digest size and it is set to a larger value by the
|
||
|
|
application. After calling \fIEVP_DigestFinal_ex()\fR no additional calls to
|
||
|
|
\&\fIEVP_DigestUpdate()\fR can be made, but \fIEVP_DigestInit_ex2()\fR can be called to
|
||
|
|
initialize a new digest operation.
|
||
|
|
.IP "\fIEVP_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 \fIctx\fR and places it in \fIlen\fR\-sized \fImd\fR.
|
||
|
|
After calling this function no additional calls to \fIEVP_DigestUpdate()\fR can be
|
||
|
|
made, but \fIEVP_DigestInit_ex2()\fR can be called to initialize a new operation.
|
||
|
|
.IP "\fIEVP_MD_CTX_dup()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_dup()"
|
||
|
|
Can be used to duplicate the message digest state from \fIin\fR. This is useful
|
||
|
|
to avoid multiple \fIEVP_MD_fetch()\fR calls or if large amounts of data are to be
|
||
|
|
hashed which only differ in the last few bytes.
|
||
|
|
.IP "\fIEVP_MD_CTX_copy_ex()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_copy_ex()"
|
||
|
|
Can be used to copy the message digest state from \fIin\fR to \fIout\fR. This is
|
||
|
|
useful if large amounts of data are to be hashed which only differ in the last
|
||
|
|
few bytes.
|
||
|
|
.IP "\fIEVP_DigestInit()\fR" 4
|
||
|
|
.IX Item "EVP_DigestInit()"
|
||
|
|
Behaves in the same way as \fIEVP_DigestInit_ex2()\fR except it doesn't set any
|
||
|
|
parameters and calls \fIEVP_MD_CTX_reset()\fR so it cannot be used with an \fItype\fR
|
||
|
|
of \s-1NULL.\s0
|
||
|
|
.IP "\fIEVP_DigestFinal()\fR" 4
|
||
|
|
.IX Item "EVP_DigestFinal()"
|
||
|
|
Similar to \fIEVP_DigestFinal_ex()\fR except after computing the digest
|
||
|
|
the digest context \fIctx\fR is automatically cleaned up with \fIEVP_MD_CTX_reset()\fR.
|
||
|
|
.IP "\fIEVP_MD_CTX_copy()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_copy()"
|
||
|
|
Similar to \fIEVP_MD_CTX_copy_ex()\fR except the destination \fIout\fR does not have to
|
||
|
|
be initialized.
|
||
|
|
.IP "\fIEVP_MD_is_a()\fR" 4
|
||
|
|
.IX Item "EVP_MD_is_a()"
|
||
|
|
Returns 1 if \fImd\fR is an implementation of an algorithm that's
|
||
|
|
identifiable with \fIname\fR, otherwise 0.
|
||
|
|
.Sp
|
||
|
|
If \fImd\fR is a legacy digest (it's the return value from the likes of
|
||
|
|
\&\fIEVP_sha256()\fR rather than the result of an \fIEVP_MD_fetch()\fR), only cipher
|
||
|
|
names registered with the default library context (see
|
||
|
|
\&\s-1\fIOSSL_LIB_CTX\s0\fR\|(3)) will be considered.
|
||
|
|
.IP "\fIEVP_MD_get0_name()\fR, \fIEVP_MD_CTX_get0_name()\fR" 4
|
||
|
|
.IX Item "EVP_MD_get0_name(), EVP_MD_CTX_get0_name()"
|
||
|
|
Return the name of the given message digest. For fetched message
|
||
|
|
digests with multiple names, only one of them is returned; it's
|
||
|
|
recommended to use \fIEVP_MD_names_do_all()\fR instead.
|
||
|
|
.IP "\fIEVP_MD_names_do_all()\fR" 4
|
||
|
|
.IX Item "EVP_MD_names_do_all()"
|
||
|
|
Traverses all names for the \fImd\fR, and calls \fIfn\fR with each name and
|
||
|
|
\&\fIdata\fR. This is only useful with fetched \fB\s-1EVP_MD\s0\fRs.
|
||
|
|
.IP "\fIEVP_MD_get0_description()\fR" 4
|
||
|
|
.IX Item "EVP_MD_get0_description()"
|
||
|
|
Returns a description of the digest, meant for display and human consumption.
|
||
|
|
The description is at the discretion of the digest implementation.
|
||
|
|
.IP "\fIEVP_MD_get0_provider()\fR" 4
|
||
|
|
.IX Item "EVP_MD_get0_provider()"
|
||
|
|
Returns an \fB\s-1OSSL_PROVIDER\s0\fR pointer to the provider that implements the given
|
||
|
|
\&\fB\s-1EVP_MD\s0\fR.
|
||
|
|
.IP "\fIEVP_MD_get_size()\fR, \fIEVP_MD_CTX_get_size()\fR" 4
|
||
|
|
.IX Item "EVP_MD_get_size(), EVP_MD_CTX_get_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 "\fIEVP_MD_get_block_size()\fR, \fIEVP_MD_CTX_get_block_size()\fR" 4
|
||
|
|
.IX Item "EVP_MD_get_block_size(), EVP_MD_CTX_get_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 "\fIEVP_MD_get_type()\fR, \fIEVP_MD_CTX_get_type()\fR" 4
|
||
|
|
.IX Item "EVP_MD_get_type(), EVP_MD_CTX_get_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_get_type(EVP_sha1())\*(C'\fR
|
||
|
|
returns \fBNID_sha1\fR. This function is normally used when setting \s-1ASN1\s0 OIDs.
|
||
|
|
.IP "\fIEVP_MD_CTX_get0_md_data()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_get0_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
|
||
|
|
\&\fIEVP_MD_meth_set_app_datasize()\fR.
|
||
|
|
.IP "\fIEVP_MD_CTX_get0_md()\fR, \fIEVP_MD_CTX_get1_md()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_get0_md(), EVP_MD_CTX_get1_md()"
|
||
|
|
\&\fIEVP_MD_CTX_get0_md()\fR returns
|
||
|
|
the \fB\s-1EVP_MD\s0\fR structure corresponding to the passed \fB\s-1EVP_MD_CTX\s0\fR. This
|
||
|
|
will be the same \fB\s-1EVP_MD\s0\fR object originally passed to \fIEVP_DigestInit_ex2()\fR (or
|
||
|
|
other similar function) when the \s-1EVP_MD_CTX\s0 was first initialised. Note that
|
||
|
|
where explicit fetch is in use (see \fIEVP_MD_fetch\fR\|(3)) the value returned from
|
||
|
|
this function will not have its reference count incremented and therefore it
|
||
|
|
should not be used after the \s-1EVP_MD_CTX\s0 is freed.
|
||
|
|
\&\fIEVP_MD_CTX_get1_md()\fR is the same except the ownership is passed to the
|
||
|
|
caller and is from the passed \fB\s-1EVP_MD_CTX\s0\fR.
|
||
|
|
.IP "\fIEVP_MD_CTX_set_update_fn()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_set_update_fn()"
|
||
|
|
Sets the update function for \fIctx\fR to \fIupdate\fR.
|
||
|
|
This is the function that is called by \fIEVP_DigestUpdate()\fR. If not set, the
|
||
|
|
update function from the \fB\s-1EVP_MD\s0\fR type specified at initialization is used.
|
||
|
|
.IP "\fIEVP_MD_CTX_update_fn()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_update_fn()"
|
||
|
|
Returns the update function for \fIctx\fR.
|
||
|
|
.IP "\fIEVP_MD_get_flags()\fR" 4
|
||
|
|
.IX Item "EVP_MD_get_flags()"
|
||
|
|
Returns the \fImd\fR flags. Note that these are different from the \fB\s-1EVP_MD_CTX\s0\fR
|
||
|
|
ones. See \fIEVP_MD_meth_set_flags\fR\|(3) for more information.
|
||
|
|
.IP "\fIEVP_MD_get_pkey_type()\fR" 4
|
||
|
|
.IX Item "EVP_MD_get_pkey_type()"
|
||
|
|
Returns the \s-1NID\s0 of the public key signing algorithm associated with this
|
||
|
|
digest. For example \fIEVP_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 "\fIEVP_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 "\fIEVP_get_digestbyname()\fR, \fIEVP_get_digestbynid()\fR, \fIEVP_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.
|
||
|
|
.Sp
|
||
|
|
The \fIEVP_get_digestbyname()\fR function is present for backwards compatibility with
|
||
|
|
OpenSSL prior to version 3 and is different to the \fIEVP_MD_fetch()\fR function
|
||
|
|
since it does not attempt to \*(L"fetch\*(R" an implementation of the cipher.
|
||
|
|
Additionally, it only knows about digests that are built-in to OpenSSL and have
|
||
|
|
an associated \s-1NID.\s0 Similarly \fIEVP_get_digestbynid()\fR and \fIEVP_get_digestbyobj()\fR
|
||
|
|
also return objects without an associated implementation.
|
||
|
|
.Sp
|
||
|
|
When the digest objects returned by these functions are used (such as in a call
|
||
|
|
to \fIEVP_DigestInit_ex()\fR) an implementation of the digest will be implicitly
|
||
|
|
fetched from the loaded providers. This fetch could fail if no suitable
|
||
|
|
implementation is available. Use \fIEVP_MD_fetch()\fR instead to explicitly fetch
|
||
|
|
the algorithm and an associated implementation from a provider.
|
||
|
|
.Sp
|
||
|
|
See \*(L"\s-1ALGORITHM FETCHING\*(R"\s0 in \fIcrypto\fR\|(7) for more information about fetching.
|
||
|
|
.Sp
|
||
|
|
The digest objects returned from these functions do not need to be freed with
|
||
|
|
\&\fIEVP_MD_free()\fR.
|
||
|
|
.IP "\fIEVP_MD_CTX_get_pkey_ctx()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_get_pkey_ctx()"
|
||
|
|
Returns the \fB\s-1EVP_PKEY_CTX\s0\fR assigned to \fIctx\fR. The returned pointer should not
|
||
|
|
be freed by the caller.
|
||
|
|
.IP "\fIEVP_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 customized \fB\s-1EVP_PKEY_CTX\s0\fR to \fIEVP_DigestSignInit\fR\|(3) or
|
||
|
|
\&\fIEVP_DigestVerifyInit\fR\|(3). The \fIpctx\fR passed to this function should be freed
|
||
|
|
by the caller. A \s-1NULL \s0\fIpctx\fR pointer is also allowed to clear the \fB\s-1EVP_PKEY_CTX\s0\fR
|
||
|
|
assigned to \fIctx\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.
|
||
|
|
.IP "\fIEVP_MD_do_all_provided()\fR" 4
|
||
|
|
.IX Item "EVP_MD_do_all_provided()"
|
||
|
|
Traverses all messages digests implemented by all activated providers
|
||
|
|
in the given library context \fIlibctx\fR, and for each of the implementations,
|
||
|
|
calls the given function \fIfn\fR with the implementation method and the given
|
||
|
|
\&\fIarg\fR as argument.
|
||
|
|
.SH "PARAMETERS"
|
||
|
|
.IX Header "PARAMETERS"
|
||
|
|
See \s-1\fIOSSL_PARAM\s0\fR\|(3) for information about passing parameters.
|
||
|
|
.PP
|
||
|
|
\&\fIEVP_MD_CTX_set_params()\fR can be used with the following \s-1OSSL_PARAM\s0 keys:
|
||
|
|
.ie n .IP """xoflen"" (\fB\s-1OSSL_DIGEST_PARAM_XOFLEN\s0\fR) <unsigned integer>" 4
|
||
|
|
.el .IP "``xoflen'' (\fB\s-1OSSL_DIGEST_PARAM_XOFLEN\s0\fR) <unsigned integer>" 4
|
||
|
|
.IX Item "xoflen (OSSL_DIGEST_PARAM_XOFLEN) <unsigned integer>"
|
||
|
|
Sets the digest length for extendable output functions.
|
||
|
|
It is used by the \s-1SHAKE\s0 algorithm and should not exceed what can be given
|
||
|
|
using a \fBsize_t\fR.
|
||
|
|
.ie n .IP """pad-type"" (\fB\s-1OSSL_DIGEST_PARAM_PAD_TYPE\s0\fR) <unsigned integer>" 4
|
||
|
|
.el .IP "``pad-type'' (\fB\s-1OSSL_DIGEST_PARAM_PAD_TYPE\s0\fR) <unsigned integer>" 4
|
||
|
|
.IX Item "pad-type (OSSL_DIGEST_PARAM_PAD_TYPE) <unsigned integer>"
|
||
|
|
Sets the padding type.
|
||
|
|
It is used by the \s-1MDC2\s0 algorithm.
|
||
|
|
.PP
|
||
|
|
\&\fIEVP_MD_CTX_get_params()\fR can be used with the following \s-1OSSL_PARAM\s0 keys:
|
||
|
|
.ie n .IP """micalg"" (\fB\s-1OSSL_PARAM_DIGEST_KEY_MICALG\s0\fR) <\s-1UTF8\s0 string>." 4
|
||
|
|
.el .IP "``micalg'' (\fB\s-1OSSL_PARAM_DIGEST_KEY_MICALG\s0\fR) <\s-1UTF8\s0 string>." 4
|
||
|
|
.IX Item "micalg (OSSL_PARAM_DIGEST_KEY_MICALG) <UTF8 string>."
|
||
|
|
Gets the digest Message Integrity Check algorithm string. This is used when
|
||
|
|
creating S/MIME multipart/signed messages, as specified in \s-1RFC 3851.\s0
|
||
|
|
It may be used by external engines or providers.
|
||
|
|
.SH "CONTROLS"
|
||
|
|
.IX Header "CONTROLS"
|
||
|
|
\&\fIEVP_MD_CTX_ctrl()\fR can be used to send the following standard controls:
|
||
|
|
.IP "\s-1EVP_MD_CTRL_MICALG\s0" 4
|
||
|
|
.IX Item "EVP_MD_CTRL_MICALG"
|
||
|
|
Gets the digest Message Integrity Check algorithm string. This is used when
|
||
|
|
creating S/MIME multipart/signed messages, as specified in \s-1RFC 3851.\s0
|
||
|
|
The string value is written to \fIp2\fR.
|
||
|
|
.Sp
|
||
|
|
When used with a fetched \fB\s-1EVP_MD\s0\fR, \fIEVP_MD_CTX_get_params()\fR gets called with
|
||
|
|
an \s-1\fIOSSL_PARAM\s0\fR\|(3) item with the key \*(L"micalg\*(R" (\fB\s-1OSSL_DIGEST_PARAM_MICALG\s0\fR).
|
||
|
|
.IP "\s-1EVP_MD_CTRL_XOF_LEN\s0" 4
|
||
|
|
.IX Item "EVP_MD_CTRL_XOF_LEN"
|
||
|
|
This control sets the digest length for extendable output functions to \fIp1\fR.
|
||
|
|
Sending this control directly should not be necessary, the use of
|
||
|
|
\&\fIEVP_DigestFinalXOF()\fR is preferred.
|
||
|
|
Currently used by \s-1SHAKE.\s0
|
||
|
|
.Sp
|
||
|
|
When used with a fetched \fB\s-1EVP_MD\s0\fR, \fIEVP_MD_CTX_get_params()\fR gets called with
|
||
|
|
an \s-1\fIOSSL_PARAM\s0\fR\|(3) item with the key \*(L"xoflen\*(R" (\fB\s-1OSSL_DIGEST_PARAM_XOFLEN\s0\fR).
|
||
|
|
.SH "FLAGS"
|
||
|
|
.IX Header "FLAGS"
|
||
|
|
\&\fIEVP_MD_CTX_set_flags()\fR, \fIEVP_MD_CTX_clear_flags()\fR and \fIEVP_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 \fIEVP_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 "\fIEVP_MD_fetch()\fR" 4
|
||
|
|
.IX Item "EVP_MD_fetch()"
|
||
|
|
Returns a pointer to a \fB\s-1EVP_MD\s0\fR for success or \s-1NULL\s0 for failure.
|
||
|
|
.IP "\fIEVP_MD_up_ref()\fR" 4
|
||
|
|
.IX Item "EVP_MD_up_ref()"
|
||
|
|
Returns 1 for success or 0 for failure.
|
||
|
|
.IP "\fIEVP_Q_digest()\fR, \fIEVP_Digest()\fR, \fIEVP_DigestInit_ex2()\fR, \fIEVP_DigestInit_ex()\fR, \fIEVP_DigestInit()\fR, \fIEVP_DigestUpdate()\fR, \fIEVP_DigestFinal_ex()\fR, \fIEVP_DigestFinalXOF()\fR, and \fIEVP_DigestFinal()\fR" 4
|
||
|
|
.IX Item "EVP_Q_digest(), EVP_Digest(), EVP_DigestInit_ex2(), EVP_DigestInit_ex(), EVP_DigestInit(), EVP_DigestUpdate(), EVP_DigestFinal_ex(), EVP_DigestFinalXOF(), and EVP_DigestFinal()"
|
||
|
|
return 1 for
|
||
|
|
success and 0 for failure.
|
||
|
|
.IP "\fIEVP_MD_CTX_ctrl()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_ctrl()"
|
||
|
|
Returns 1 if successful or 0 for failure.
|
||
|
|
.IP "\fIEVP_MD_CTX_set_params()\fR, \fIEVP_MD_CTX_get_params()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_set_params(), EVP_MD_CTX_get_params()"
|
||
|
|
Returns 1 if successful or 0 for failure.
|
||
|
|
.IP "\fIEVP_MD_CTX_settable_params()\fR, \fIEVP_MD_CTX_gettable_params()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_settable_params(), EVP_MD_CTX_gettable_params()"
|
||
|
|
Return an array of constant \s-1\fIOSSL_PARAM\s0\fR\|(3)s, or \s-1NULL\s0 if there is none
|
||
|
|
to get.
|
||
|
|
.IP "\fIEVP_MD_CTX_dup()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_dup()"
|
||
|
|
Returns a new \s-1EVP_MD_CTX\s0 if successful or \s-1NULL\s0 on failure.
|
||
|
|
.IP "\fIEVP_MD_CTX_copy_ex()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_copy_ex()"
|
||
|
|
Returns 1 if successful or 0 for failure.
|
||
|
|
.IP "\fIEVP_MD_get_type()\fR, \fIEVP_MD_get_pkey_type()\fR" 4
|
||
|
|
.IX Item "EVP_MD_get_type(), EVP_MD_get_pkey_type()"
|
||
|
|
Returns the \s-1NID\s0 of the corresponding \s-1OBJECT IDENTIFIER\s0 or NID_undef if none
|
||
|
|
exists.
|
||
|
|
.IP "\fIEVP_MD_get_size()\fR, \fIEVP_MD_get_block_size()\fR, \fIEVP_MD_CTX_get_size()\fR, \fIEVP_MD_CTX_get_block_size()\fR" 4
|
||
|
|
.IX Item "EVP_MD_get_size(), EVP_MD_get_block_size(), EVP_MD_CTX_get_size(), EVP_MD_CTX_get_block_size()"
|
||
|
|
Returns the digest or block size in bytes or \-1 for failure.
|
||
|
|
.IP "\fIEVP_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 "\fIEVP_get_digestbyname()\fR, \fIEVP_get_digestbynid()\fR, \fIEVP_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 "\fIEVP_MD_CTX_set_pkey_ctx()\fR" 4
|
||
|
|
.IX Item "EVP_MD_CTX_set_pkey_ctx()"
|
||
|
|
This function has no return value.
|
||
|
|
.IP "\fIEVP_MD_names_do_all()\fR" 4
|
||
|
|
.IX Item "EVP_MD_names_do_all()"
|
||
|
|
Returns 1 if the callback was called for all names. A return value of 0 means
|
||
|
|
that the callback was not called for any names.
|
||
|
|
.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 \fIEVP_sha256\fR\|(3)) or the \s-1SHA\-3\s0
|
||
|
|
digest algorithms (such as \fIEVP_sha3_512\fR\|(3)). The other digest algorithms
|
||
|
|
are still in common use.
|
||
|
|
.PP
|
||
|
|
For most applications the \fIimpl\fR parameter to \fIEVP_DigestInit_ex()\fR will be
|
||
|
|
set to \s-1NULL\s0 to use the default digest implementation.
|
||
|
|
.PP
|
||
|
|
Ignoring failure returns of \fIEVP_DigestInit_ex()\fR, \fIEVP_DigestInit_ex2()\fR, or
|
||
|
|
\&\fIEVP_DigestInit()\fR can lead to undefined behavior on subsequent calls
|
||
|
|
updating or finalizing the \fB\s-1EVP_MD_CTX\s0\fR such as the \fIEVP_DigestUpdate()\fR or
|
||
|
|
\&\fIEVP_DigestFinal()\fR functions. The only valid calls on the \fB\s-1EVP_MD_CTX\s0\fR
|
||
|
|
when initialization fails are calls that attempt another initialization of
|
||
|
|
the context or release the context.
|
||
|
|
.PP
|
||
|
|
The functions \fIEVP_DigestInit()\fR, \fIEVP_DigestFinal()\fR and \fIEVP_MD_CTX_copy()\fR are
|
||
|
|
obsolete but are retained to maintain compatibility with existing code. New
|
||
|
|
applications should use \fIEVP_DigestInit_ex()\fR, \fIEVP_DigestFinal_ex()\fR and
|
||
|
|
\&\fIEVP_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
|
||
|
|
\&\fIEVP_MD_CTX_get0_name()\fR, \fIEVP_MD_CTX_get_size()\fR, \fIEVP_MD_CTX_get_block_size()\fR,
|
||
|
|
\&\fIEVP_MD_CTX_get_type()\fR, \fIEVP_get_digestbynid()\fR and \fIEVP_get_digestbyobj()\fR are
|
||
|
|
defined as macros.
|
||
|
|
.PP
|
||
|
|
\&\fIEVP_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();
|
||
|
|
\& if (!EVP_DigestInit_ex2(mdctx, md, NULL)) {
|
||
|
|
\& printf("Message digest initialization failed.\en");
|
||
|
|
\& EVP_MD_CTX_free(mdctx);
|
||
|
|
\& exit(1);
|
||
|
|
\& }
|
||
|
|
\& if (!EVP_DigestUpdate(mdctx, mess1, strlen(mess1))) {
|
||
|
|
\& printf("Message digest update failed.\en");
|
||
|
|
\& EVP_MD_CTX_free(mdctx);
|
||
|
|
\& exit(1);
|
||
|
|
\& }
|
||
|
|
\& if (!EVP_DigestUpdate(mdctx, mess2, strlen(mess2))) {
|
||
|
|
\& printf("Message digest update failed.\en");
|
||
|
|
\& EVP_MD_CTX_free(mdctx);
|
||
|
|
\& exit(1);
|
||
|
|
\& }
|
||
|
|
\& if (!EVP_DigestFinal_ex(mdctx, md_value, &md_len)) {
|
||
|
|
\& printf("Message digest finalization failed.\en");
|
||
|
|
\& EVP_MD_CTX_free(mdctx);
|
||
|
|
\& exit(1);
|
||
|
|
\& }
|
||
|
|
\& 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"
|
||
|
|
\&\fIEVP_MD_meth_new\fR\|(3),
|
||
|
|
\&\fIopenssl\-dgst\fR\|(1),
|
||
|
|
\&\fIevp\fR\|(7),
|
||
|
|
\&\s-1\fIOSSL_PROVIDER\s0\fR\|(3),
|
||
|
|
\&\s-1\fIOSSL_PARAM\s0\fR\|(3),
|
||
|
|
\&\fIproperty\fR\|(7),
|
||
|
|
\&\*(L"\s-1ALGORITHM FETCHING\*(R"\s0 in \fIcrypto\fR\|(7),
|
||
|
|
\&\fIprovider\-digest\fR\|(7),
|
||
|
|
\&\fIlife_cycle\-digest\fR\|(7)
|
||
|
|
.PP
|
||
|
|
The full list of digest algorithms are provided below.
|
||
|
|
.PP
|
||
|
|
\&\fIEVP_blake2b512\fR\|(3),
|
||
|
|
\&\fIEVP_md2\fR\|(3),
|
||
|
|
\&\fIEVP_md4\fR\|(3),
|
||
|
|
\&\fIEVP_md5\fR\|(3),
|
||
|
|
\&\fIEVP_mdc2\fR\|(3),
|
||
|
|
\&\fIEVP_ripemd160\fR\|(3),
|
||
|
|
\&\fIEVP_sha1\fR\|(3),
|
||
|
|
\&\fIEVP_sha224\fR\|(3),
|
||
|
|
\&\fIEVP_sha3_224\fR\|(3),
|
||
|
|
\&\fIEVP_sm3\fR\|(3),
|
||
|
|
\&\fIEVP_whirlpool\fR\|(3)
|
||
|
|
.SH "HISTORY"
|
||
|
|
.IX Header "HISTORY"
|
||
|
|
The \fIEVP_MD_CTX_create()\fR and \fIEVP_MD_CTX_destroy()\fR functions were renamed to
|
||
|
|
\&\fIEVP_MD_CTX_new()\fR and \fIEVP_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 \fIEVP_sha1()\fR can be used with \s-1RSA\s0 and \s-1DSA.\s0
|
||
|
|
.PP
|
||
|
|
The \fIEVP_dss1()\fR function was removed in OpenSSL 1.1.0.
|
||
|
|
.PP
|
||
|
|
The \fIEVP_MD_CTX_set_pkey_ctx()\fR function was added in OpenSSL 1.1.1.
|
||
|
|
.PP
|
||
|
|
The \fIEVP_Q_digest()\fR, \fIEVP_DigestInit_ex2()\fR,
|
||
|
|
\&\fIEVP_MD_fetch()\fR, \fIEVP_MD_free()\fR, \fIEVP_MD_up_ref()\fR,
|
||
|
|
\&\fIEVP_MD_get_params()\fR, \fIEVP_MD_CTX_set_params()\fR, \fIEVP_MD_CTX_get_params()\fR,
|
||
|
|
\&\fIEVP_MD_gettable_params()\fR, \fIEVP_MD_gettable_ctx_params()\fR,
|
||
|
|
\&\fIEVP_MD_settable_ctx_params()\fR, \fIEVP_MD_CTX_settable_params()\fR and
|
||
|
|
\&\fIEVP_MD_CTX_gettable_params()\fR functions were added in OpenSSL 3.0.
|
||
|
|
.PP
|
||
|
|
The \fIEVP_MD_type()\fR, \fIEVP_MD_nid()\fR, \fIEVP_MD_name()\fR, \fIEVP_MD_pkey_type()\fR,
|
||
|
|
\&\fIEVP_MD_size()\fR, \fIEVP_MD_block_size()\fR, \fIEVP_MD_flags()\fR, \fIEVP_MD_CTX_size()\fR,
|
||
|
|
\&\fIEVP_MD_CTX_block_size()\fR, \fIEVP_MD_CTX_type()\fR, and \fIEVP_MD_CTX_md_data()\fR
|
||
|
|
functions were renamed to include \f(CW\*(C`get\*(C'\fR or \f(CW\*(C`get0\*(C'\fR in their names in
|
||
|
|
OpenSSL 3.0, respectively. The old names are kept as non-deprecated
|
||
|
|
alias macros.
|
||
|
|
.PP
|
||
|
|
The \fIEVP_MD_CTX_md()\fR function was deprecated in OpenSSL 3.0; use
|
||
|
|
\&\fIEVP_MD_CTX_get0_md()\fR instead.
|
||
|
|
\&\fIEVP_MD_CTX_update_fn()\fR and \fIEVP_MD_CTX_set_update_fn()\fR were deprecated
|
||
|
|
in OpenSSL 3.0.
|
||
|
|
.PP
|
||
|
|
\&\fIEVP_MD_CTX_dup()\fR was added in OpenSSL 3.2.
|
||
|
|
.SH "COPYRIGHT"
|
||
|
|
.IX Header "COPYRIGHT"
|
||
|
|
Copyright 2000\-2023 The OpenSSL Project Authors. All Rights Reserved.
|
||
|
|
.PP
|
||
|
|
Licensed under the Apache License 2.0 (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>.
|