391 lines
16 KiB
Groff
Executable File
391 lines
16 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "EVP_KDF 3"
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.TH EVP_KDF 3 "2020-03-02" "3.0.0-dev" "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_KDF, EVP_KDF_fetch, EVP_KDF_free, EVP_KDF_up_ref,
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EVP_KDF_CTX, EVP_KDF_CTX_new, EVP_KDF_CTX_free, EVP_KDF_CTX_dup,
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EVP_KDF_reset, EVP_KDF_derive,
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EVP_KDF_size, EVP_KDF_provider, EVP_KDF_CTX_kdf, EVP_KDF_is_a,
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EVP_KDF_number, EVP_KDF_names_do_all,
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EVP_KDF_CTX_get_params, EVP_KDF_CTX_set_params, EVP_KDF_do_all_provided,
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EVP_KDF_get_params, EVP_KDF_gettable_ctx_params, EVP_KDF_settable_ctx_params,
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EVP_KDF_gettable_params \- EVP KDF 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/kdf.h>
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\&
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\& typedef struct evp_kdf_st EVP_KDF;
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\& typedef struct evp_kdf_ctx_st EVP_KDF_CTX;
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\&
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\& EVP_KDF_CTX *EVP_KDF_CTX_new(const EVP_KDF *kdf);
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\& const EVP_KDF *EVP_KDF_CTX_kdf(EVP_KDF_CTX *ctx);
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\& void EVP_KDF_CTX_free(EVP_KDF_CTX *ctx);
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\& EVP_KDF_CTX *EVP_KDF_CTX_dup(const EVP_KDF_CTX *src);
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\& void EVP_KDF_reset(EVP_KDF_CTX *ctx);
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\& size_t EVP_KDF_size(EVP_KDF_CTX *ctx);
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\& int EVP_KDF_derive(EVP_KDF_CTX *ctx, unsigned char *key, size_t keylen);
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\& int EVP_KDF_up_ref(EVP_KDF *kdf);
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\& void EVP_KDF_free(EVP_KDF *kdf);
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\& EVP_KDF *EVP_KDF_fetch(OPENSSL_CTX *libctx, const char *algorithm,
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\& const char *properties);
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\& int EVP_KDF_number(const EVP_KDF *kdf);
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\& int EVP_KDF_is_a(const EVP_KDF *kdf, const char *name);
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\& const OSSL_PROVIDER *EVP_KDF_provider(const EVP_KDF *kdf);
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\& void EVP_KDF_do_all_provided(OPENSSL_CTX *libctx,
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\& void (*fn)(EVP_KDF *kdf, void *arg),
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\& void *arg);
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\& void EVP_KDF_names_do_all(const EVP_KDF *kdf,
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\& void (*fn)(const char *name, void *data),
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\& void *data);
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\& int EVP_KDF_get_params(EVP_KDF *kdf, OSSL_PARAM params[]);
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\& int EVP_KDF_CTX_get_params(EVP_KDF_CTX *ctx, OSSL_PARAM params[]);
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\& int EVP_KDF_CTX_set_params(EVP_KDF_CTX *ctx, const OSSL_PARAM params[]);
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\& const OSSL_PARAM *EVP_KDF_gettable_params(const EVP_KDF *kdf);
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\& const OSSL_PARAM *EVP_KDF_gettable_ctx_params(const EVP_KDF *kdf);
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\& const OSSL_PARAM *EVP_KDF_settable_ctx_params(const EVP_KDF *kdf);
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\& const OSSL_PROVIDER *EVP_KDF_provider(const EVP_KDF *kdf);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \s-1EVP\s0 \s-1KDF\s0 routines are a high level interface to Key Derivation Function
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algorithms and should be used instead of algorithm-specific functions.
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.PP
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After creating a \fB\s-1EVP_KDF_CTX\s0\fR for the required algorithm using
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\&\fIEVP_KDF_CTX_new()\fR, inputs to the algorithm are supplied
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using calls to \fIEVP_KDF_CTX_set_params()\fR before
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calling \fIEVP_KDF_derive()\fR to derive the key.
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.SS "Types"
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.IX Subsection "Types"
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\&\fB\s-1EVP_KDF\s0\fR is a type that holds the implementation of a \s-1KDF\s0.
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.PP
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\&\fB\s-1EVP_KDF_CTX\s0\fR is a context type that holds the algorithm inputs.
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.SS "Algorithm implementation fetching"
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.IX Subsection "Algorithm implementation fetching"
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\&\fIEVP_KDF_fetch()\fR fetches an implementation of a \s-1KDF\s0 \fIalgorithm\fR, given
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a library context \fIlibctx\fR and a set of \fIproperties\fR.
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See \*(L"Fetching algorithms\*(R" in \fIprovider\fR\|(7) for further information.
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.PP
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The returned value must eventually be freed with
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\&\fIEVP_KDF_free\fR\|(3).
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.PP
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\&\fIEVP_KDF_up_ref()\fR increments the reference count of an already fetched
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\&\s-1KDF\s0.
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.PP
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\&\fIEVP_KDF_free()\fR frees a fetched algorithm.
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\&\s-1NULL\s0 is a valid parameter, for which this function is a no-op.
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.SS "Context manipulation functions"
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.IX Subsection "Context manipulation functions"
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\&\fIEVP_KDF_CTX_new()\fR creates a new context for the \s-1KDF\s0 implementation \fIkdf\fR.
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.PP
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\&\fIEVP_KDF_CTX_free()\fR frees up the context \fIctx\fR. If \fIctx\fR is \s-1NULL\s0, nothing
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is done.
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.PP
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\&\fIEVP_KDF_CTX_kdf()\fR returns the \fB\s-1EVP_KDF\s0\fR associated with the context
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\&\fIctx\fR.
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.SS "Computing functions"
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.IX Subsection "Computing functions"
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\&\fIEVP_KDF_reset()\fR resets the context to the default state as if the context
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had just been created.
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.PP
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\&\fIEVP_KDF_derive()\fR derives \fIkeylen\fR bytes of key material and places it in the
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\&\fIkey\fR buffer. If the algorithm produces a fixed amount of output then an
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error will occur unless the \fIkeylen\fR parameter is equal to that output size,
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as returned by \fIEVP_KDF_size()\fR.
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.PP
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\&\fIEVP_KDF_get_params()\fR retrieves details about the implementation
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\&\fIkdf\fR.
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The set of parameters given with \fIparams\fR determine exactly what
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parameters should be retrieved.
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Note that a parameter that is unknown in the underlying context is
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simply ignored.
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.PP
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\&\fIEVP_KDF_CTX_get_params()\fR retrieves chosen parameters, given the
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context \fIctx\fR and its underlying context.
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The set of parameters given with \fIparams\fR determine exactly what
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parameters should be retrieved.
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Note that a parameter that is unknown in the underlying context is
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simply ignored.
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.PP
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\&\fIEVP_KDF_CTX_set_params()\fR passes chosen parameters to the underlying
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context, given a context \fIctx\fR.
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The set of parameters given with \fIparams\fR determine exactly what
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parameters are passed down.
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Note that a parameter that is unknown in the underlying context is
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simply ignored.
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Also, what happens when a needed parameter isn't passed down is
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defined by the implementation.
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.PP
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\&\fIEVP_KDF_gettable_params()\fR, \fIEVP_KDF_gettable_ctx_params()\fR and
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\&\fIEVP_KDF_settable_ctx_params()\fR get a constant \fB\s-1OSSL_PARAM\s0\fR array that
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describes the retrievable and settable parameters, i.e. parameters that
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can be used with \fIEVP_KDF_get_params()\fR, \fIEVP_KDF_CTX_get_params()\fR
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and \fIEVP_KDF_CTX_set_params()\fR, respectively.
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See \s-1\fIOSSL_PARAM\s0\fR\|(3) for the use of \fB\s-1OSSL_PARAM\s0\fR as parameter descriptor.
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.SS "Information functions"
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.IX Subsection "Information functions"
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\&\fIEVP_KDF_size()\fR returns the output size if the algorithm produces a fixed amount
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of output and \fB\s-1SIZE_MAX\s0\fR otherwise. If an error occurs then 0 is returned.
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For some algorithms an error may result if input parameters necessary to
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calculate a fixed output size have not yet been supplied.
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.PP
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\&\fIEVP_KDF_is_a()\fR returns 1 if \fIkdf\fR is an implementation of an
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algorithm that's identifiable with \fIname\fR, otherwise 0.
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.PP
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\&\fIEVP_KDF_provider()\fR returns the provider that holds the implementation
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of the given \fIkdf\fR.
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.PP
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\&\fIEVP_KDF_do_all_provided()\fR traverses all \s-1KDF\s0 implemented by all activated
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providers in the given library context \fIlibctx\fR, and for each of the
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implementations, calls the given function \fIfn\fR with the implementation method
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and the given \fIarg\fR as argument.
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.PP
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\&\fIEVP_KDF_number()\fR returns the internal dynamic number assigned to
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\&\fIkdf\fR.
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.PP
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\&\fIEVP_KDF_names_do_all()\fR traverses all names for \fIkdf\fR, and calls
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\&\fIfn\fR with each name and \fIdata\fR.
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.SH "PARAMETERS"
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.IX Header "PARAMETERS"
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The standard parameter names are:
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.ie n .IP """pass"" (\fB\s-1OSSL_KDF_PARAM_PASSWORD\s0\fR) <octet string>" 4
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.el .IP "``pass'' (\fB\s-1OSSL_KDF_PARAM_PASSWORD\s0\fR) <octet string>" 4
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.IX Item "pass (OSSL_KDF_PARAM_PASSWORD) <octet string>"
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Some \s-1KDF\s0 implementations require a password.
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For those \s-1KDF\s0 implementations that support it, this parameter sets the password.
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.ie n .IP """salt"" (\fB\s-1OSSL_KDF_PARAM_SALT\s0\fR) <octet string>" 4
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.el .IP "``salt'' (\fB\s-1OSSL_KDF_PARAM_SALT\s0\fR) <octet string>" 4
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.IX Item "salt (OSSL_KDF_PARAM_SALT) <octet string>"
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Some \s-1KDF\s0 implementations can take a salt.
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For those \s-1KDF\s0 implementations that support it, this parameter sets the salt.
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.Sp
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The default value, if any, is implementation dependent.
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.ie n .IP """iter"" (\fB\s-1OSSL_KDF_PARAM_ITER\s0\fR) <unsigned integer>" 4
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.el .IP "``iter'' (\fB\s-1OSSL_KDF_PARAM_ITER\s0\fR) <unsigned integer>" 4
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.IX Item "iter (OSSL_KDF_PARAM_ITER) <unsigned integer>"
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Some \s-1KDF\s0 implementations require an iteration count.
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For those \s-1KDF\s0 implementations that support it, this parameter sets the
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iteration count.
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.Sp
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The default value, if any, is implementation dependent.
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.ie n .IP """properties"" (\fB\s-1OSSL_KDF_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4
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.el .IP "``properties'' (\fB\s-1OSSL_KDF_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4
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.IX Item "properties (OSSL_KDF_PARAM_PROPERTIES) <UTF8 string>"
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.PD 0
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.ie n .IP """mac"" (\fB\s-1OSSL_KDF_PARAM_MAC\s0\fR) <\s-1UTF8\s0 string>" 4
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.el .IP "``mac'' (\fB\s-1OSSL_KDF_PARAM_MAC\s0\fR) <\s-1UTF8\s0 string>" 4
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.IX Item "mac (OSSL_KDF_PARAM_MAC) <UTF8 string>"
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.ie n .IP """digest"" (\fB\s-1OSSL_KDF_PARAM_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4
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.el .IP "``digest'' (\fB\s-1OSSL_KDF_PARAM_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4
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.IX Item "digest (OSSL_KDF_PARAM_DIGEST) <UTF8 string>"
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.ie n .IP """cipher"" (\fB\s-1OSSL_KDF_PARAM_CIPHER\s0\fR) <\s-1UTF8\s0 string>" 4
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.el .IP "``cipher'' (\fB\s-1OSSL_KDF_PARAM_CIPHER\s0\fR) <\s-1UTF8\s0 string>" 4
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.IX Item "cipher (OSSL_KDF_PARAM_CIPHER) <UTF8 string>"
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.PD
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For \s-1KDF\s0 implementations that use an underlying computation \s-1MAC\s0, digest or
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cipher, these parameters set what the algorithm should be.
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.Sp
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The value is always the name of the intended algorithm,
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or the properties.
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.Sp
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Note that not all algorithms may support all possible underlying
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implementations.
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.ie n .IP """key"" (\fB\s-1OSSL_KDF_PARAM_KEY\s0\fR) <octet string>" 4
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.el .IP "``key'' (\fB\s-1OSSL_KDF_PARAM_KEY\s0\fR) <octet string>" 4
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.IX Item "key (OSSL_KDF_PARAM_KEY) <octet string>"
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Some \s-1KDF\s0 implementations require a key.
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For those \s-1KDF\s0 implementations that support it, this octet string parameter
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sets the key.
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.ie n .IP """maclen"" (\fB\s-1OSSL_KDF_PARAM_MAC_SIZE\s0\fR) <unsigned integer>" 4
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.el .IP "``maclen'' (\fB\s-1OSSL_KDF_PARAM_MAC_SIZE\s0\fR) <unsigned integer>" 4
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.IX Item "maclen (OSSL_KDF_PARAM_MAC_SIZE) <unsigned integer>"
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Used by implementations that use a \s-1MAC\s0 with a variable output size (\s-1KMAC\s0).
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For those \s-1KDF\s0 implementations that support it, this parameter
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sets the \s-1MAC\s0 output size.
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.Sp
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The default value, if any, is implementation dependent.
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The length must never exceed what can be given with a \fBsize_t\fR.
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.ie n .IP """maxmem_bytes"" (\fB\s-1OSSL_KDF_PARAM_SCRYPT_MAXMEM\s0\fR) <unsigned integer>" 4
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.el .IP "``maxmem_bytes'' (\fB\s-1OSSL_KDF_PARAM_SCRYPT_MAXMEM\s0\fR) <unsigned integer>" 4
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.IX Item "maxmem_bytes (OSSL_KDF_PARAM_SCRYPT_MAXMEM) <unsigned integer>"
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Memory-hard password-based \s-1KDF\s0 algorithms, such as scrypt, use an amount of
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memory that depends on the load factors provided as input.
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For those \s-1KDF\s0 implementations that support it, this \fBuint64_t\fR parameter sets
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an upper limit on the amount of memory that may be consumed while performing
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a key derivation.
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If this memory usage limit is exceeded because the load factors are chosen
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too high, the key derivation will fail.
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.Sp
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The default value is implementation dependent.
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The memory size must never exceed what can be given with a \fBsize_t\fR.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIEVP_KDF_fetch()\fR returns a pointer to a newly fetched \fB\s-1EVP_KDF\s0\fR, or
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\&\s-1NULL\s0 if allocation failed.
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.PP
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\&\fIEVP_KDF_provider()\fR returns a pointer to the provider for the \s-1KDF\s0, or
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\&\s-1NULL\s0 on error.
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.PP
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\&\fIEVP_KDF_up_ref()\fR returns 1 on success, 0 on error.
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.PP
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\&\fIEVP_KDF_CTX_new()\fR returns either the newly allocated
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\&\fB\s-1EVP_KDF_CTX\s0\fR structure or \s-1NULL\s0 if an error occurred.
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.PP
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\&\fIEVP_KDF_CTX_free()\fR and \fIEVP_KDF_reset()\fR do not return a value.
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.PP
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\&\fIEVP_KDF_size()\fR returns the output size. \fB\s-1SIZE_MAX\s0\fR is returned to indicate
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that the algorithm produces a variable amount of output; 0 to indicate failure.
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.PP
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The remaining functions return 1 for success and 0 or a negative value for
|
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failure. In particular, a return value of \-2 indicates the operation is not
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supported by the \s-1KDF\s0 algorithm.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\s-1\fIEVP_KDF\-SCRYPT\s0\fR\|(7)
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\&\s-1\fIEVP_KDF\-TLS1_PRF\s0\fR\|(7)
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\&\s-1\fIEVP_KDF\-PBKDF2\s0\fR\|(7)
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\&\s-1\fIEVP_KDF\-HKDF\s0\fR\|(7)
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\&\s-1\fIEVP_KDF\-SS\s0\fR\|(7)
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\&\s-1\fIEVP_KDF\-SSHKDF\s0\fR\|(7)
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\&\s-1\fIEVP_KDF\-X963\s0\fR\|(7)
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\&\s-1\fIEVP_KDF\-X942\s0\fR\|(7)
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.SH "HISTORY"
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|
.IX Header "HISTORY"
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|
This functionality was added to OpenSSL 3.0.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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