243 lines
8.2 KiB
Groff
Executable File
243 lines
8.2 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "EVP_KDF-X942 7"
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.TH EVP_KDF-X942 7 "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\-X942 \- The X9.42\-2001 asn1 EVP_KDF implementation
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \s-1EVP_KDF\-X942\s0 algorithm implements the key derivation function (X942KDF).
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X942KDF is used by Cryptographic Message Syntax (\s-1CMS\s0) for \s-1DH\s0 KeyAgreement, to
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derive a key using input such as a shared secret key and other info. The other
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info is \s-1DER\s0 encoded data that contains a 32 bit counter.
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.SS "Identity"
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.IX Subsection "Identity"
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\&\*(L"X942KDF\*(R" is the name for this implementation; it
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can be used with the \fIEVP_KDF_fetch()\fR function.
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.SS "Supported parameters"
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.IX Subsection "Supported parameters"
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The supported parameters are:
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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 """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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.PD
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These parameters work as described in \*(L"\s-1PARAMETERS\s0\*(R" in \s-1\fIEVP_KDF\s0\fR\|(3).
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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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The shared secret used for key derivation. This parameter sets the secret.
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.ie n .IP """ukm"" (\fB\s-1OSSL_KDF_PARAM_UKM\s0\fR) <octet string>" 4
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.el .IP "``ukm'' (\fB\s-1OSSL_KDF_PARAM_UKM\s0\fR) <octet string>" 4
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.IX Item "ukm (OSSL_KDF_PARAM_UKM) <octet string>"
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This parameter is an optional random string that is provided
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by the sender called \*(L"partyAInfo\*(R".
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In \s-1CMS\s0 this is the user keying material.
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.ie n .IP """cekalg"" (\fB\s-1OSSL_KDF_PARAM_CEK_ALG\s0\fR) <\s-1UTF8\s0 string>" 4
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.el .IP "``cekalg'' (\fB\s-1OSSL_KDF_PARAM_CEK_ALG\s0\fR) <\s-1UTF8\s0 string>" 4
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.IX Item "cekalg (OSSL_KDF_PARAM_CEK_ALG) <UTF8 string>"
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This parameter sets the \s-1CEK\s0 wrapping algorithm name.
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.SH "NOTES"
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.IX Header "NOTES"
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A context for X942KDF can be obtained by calling:
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.PP
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.Vb 2
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\& EVP_KDF *kdf = EVP_KDF_fetch(NULL, "X942KDF", NULL);
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\& EVP_KDF_CTX *kctx = EVP_KDF_CTX_new(kdf);
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.Ve
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.PP
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The output length of an X942KDF is specified via the \fIkeylen\fR
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parameter to the \fIEVP_KDF_derive\fR\|(3) function.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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This example derives 24 bytes, with the secret key \*(L"secret\*(R" and a random user
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keying material:
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.PP
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.Vb 5
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\& EVP_KDF_CTX *kctx;
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\& EVP_KDF_CTX *kctx;
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\& unsigned char out[192/8];
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\& unsignred char ukm[64];
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\& OSSL_PARAM params[5], *p = params;
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\&
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\& if (RAND_bytes(ukm, sizeof(ukm)) <= 0)
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\& error("RAND_bytes");
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\&
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\& kdf = EVP_KDF_fetch(NULL, "X942KDF", NULL);
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\& if (kctx == NULL)
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\& error("EVP_KDF_fetch");
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\& kctx = EVP_KDF_CTX_new(kdf);
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\& if (kctx == NULL)
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\& error("EVP_KDF_CTX_new");
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\& EVP_KDF_free(kdf);
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\&
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\& *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
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\& SN_sha256, strlen(SN_sha256));
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\& *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SECRET,
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\& "secret", (size_t)6);
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\& *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_UKM, ukm, sizeof(ukm));
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\& *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_CEK_ALG,
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\& SN_id_smime_alg_CMS3DESwrap,
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\& strlen(SN_id_smime_alg_CMS3DESwrap));
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\& *p = OSSL_PARAM_construct_end();
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\& if (EVP_KDF_CTX_set_params(kctx, params) <= 0)
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\& error("EVP_KDF_CTX_set_params");
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\& if (EVP_KDF_derive(kctx, out, sizeof(out)) <= 0)
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\& error("EVP_KDF_derive");
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\&
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\& EVP_KDF_CTX_free(kctx);
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.Ve
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.SH "CONFORMING TO"
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.IX Header "CONFORMING TO"
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\&\s-1RFC\s0 2631
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\s-1\fIEVP_KDF\s0\fR\|(3),
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\&\fIEVP_KDF_CTX_new\fR\|(3),
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\&\fIEVP_KDF_CTX_free\fR\|(3),
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\&\fIEVP_KDF_CTX_set_params\fR\|(3),
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\&\fIEVP_KDF_size\fR\|(3),
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\&\fIEVP_KDF_derive\fR\|(3),
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\&\*(L"\s-1PARAMETERS\s0\*(R" in \s-1\fIEVP_KDF\s0\fR\|(3)
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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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