324 lines
12 KiB
Plaintext
324 lines
12 KiB
Plaintext
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.\" ========================================================================
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.\"
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.IX Title "EVP_KDF-SS 7ossl"
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.TH EVP_KDF-SS 7ossl "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_KDF\-SS \- The Single Step / One Step EVP_KDF implementation
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \s-1EVP_KDF\-SS\s0 algorithm implements the Single Step key derivation function (\s-1SSKDF\s0).
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\&\s-1SSKDF\s0 derives a key using input such as a shared secret key (that was generated
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during the execution of a key establishment scheme) and fixedinfo.
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\&\s-1SSKDF\s0 is also informally referred to as 'Concat \s-1KDF\s0'.
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.SS "Auxiliary function"
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.IX Subsection "Auxiliary function"
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The implementation uses a selectable auxiliary function H, which can be one of:
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.IP "\fBH(x) = hash(x, digest=md)\fR" 4
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.IX Item "H(x) = hash(x, digest=md)"
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.PD 0
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.IP "\fBH(x) = HMAC_hash(x, key=salt, digest=md)\fR" 4
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.IX Item "H(x) = HMAC_hash(x, key=salt, digest=md)"
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.ie n .IP "\fBH(x) = KMACxxx(x, key=salt, custom=""\s-1KDF"",\s0 outlen=mac_size)\fR" 4
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.el .IP "\fBH(x) = KMACxxx(x, key=salt, custom=``\s-1KDF'',\s0 outlen=mac_size)\fR" 4
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.IX Item "H(x) = KMACxxx(x, key=salt, custom=KDF, outlen=mac_size)"
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.PD
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.PP
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Both the \s-1HMAC\s0 and \s-1KMAC\s0 implementations set the key using the 'salt' value.
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The hash and \s-1HMAC\s0 also require the digest to be set.
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.SS "Identity"
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.IX Subsection "Identity"
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\&\*(L"\s-1SSKDF\*(R"\s0 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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This parameter is ignored for \s-1KMAC.\s0
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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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.PD 0
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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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.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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.PD
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These parameters work as described in \*(L"\s-1PARAMETERS\*(R"\s0 in \s-1\fIEVP_KDF\s0\fR\|(3).
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.ie n .IP """key"" (\fB\s-1OSSL_KDF_PARAM_SECRET\s0\fR) <octet string>" 4
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.el .IP "``key'' (\fB\s-1OSSL_KDF_PARAM_SECRET\s0\fR) <octet string>" 4
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.IX Item "key (OSSL_KDF_PARAM_SECRET) <octet string>"
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This parameter set the shared secret that is used for key derivation.
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.ie n .IP """info"" (\fB\s-1OSSL_KDF_PARAM_INFO\s0\fR) <octet string>" 4
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.el .IP "``info'' (\fB\s-1OSSL_KDF_PARAM_INFO\s0\fR) <octet string>" 4
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.IX Item "info (OSSL_KDF_PARAM_INFO) <octet string>"
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This parameter sets an optional value for fixedinfo, also known as otherinfo.
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.SH "NOTES"
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.IX Header "NOTES"
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A context for \s-1SSKDF\s0 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, "SSKDF", 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 \s-1SSKDF\s0 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 10 bytes using H(x) = \s-1SHA\-256,\s0 with the secret key \*(L"secret\*(R"
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and fixedinfo value \*(L"label\*(R":
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.PP
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.Vb 4
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\& EVP_KDF *kdf;
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\& EVP_KDF_CTX *kctx;
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\& unsigned char out[10];
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\& OSSL_PARAM params[4], *p = params;
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\&
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\& kdf = EVP_KDF_fetch(NULL, "SSKDF", NULL);
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\& kctx = EVP_KDF_CTX_new(kdf);
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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_KEY,
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\& "secret", (size_t)6);
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\& *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_INFO,
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\& "label", (size_t)5);
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\& *p = OSSL_PARAM_construct_end();
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\& if (EVP_KDF_derive(kctx, out, sizeof(out), params) <= 0) {
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\& error("EVP_KDF_derive");
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\& }
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\&
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\& EVP_KDF_CTX_free(kctx);
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.Ve
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.PP
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This example derives 10 bytes using H(x) = \s-1HMAC\s0(\s-1SHA\-256\s0), with the secret key \*(L"secret\*(R",
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fixedinfo value \*(L"label\*(R" and salt \*(L"salt\*(R":
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.PP
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.Vb 4
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\& EVP_KDF *kdf;
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\& EVP_KDF_CTX *kctx;
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\& unsigned char out[10];
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\& OSSL_PARAM params[6], *p = params;
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\&
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\& kdf = EVP_KDF_fetch(NULL, "SSKDF", NULL);
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\& kctx = EVP_KDF_CTX_new(kdf);
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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_MAC,
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\& SN_hmac, strlen(SN_hmac));
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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_INFO,
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\& "label", (size_t)5);
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\& *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
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\& "salt", (size_t)4);
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\& *p = OSSL_PARAM_construct_end();
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\& if (EVP_KDF_derive(kctx, out, sizeof(out), params) <= 0) {
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\& error("EVP_KDF_derive");
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\& }
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\&
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\& EVP_KDF_CTX_free(kctx);
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.Ve
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.PP
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This example derives 10 bytes using H(x) = \s-1KMAC128\s0(x,salt,outlen), with the secret key \*(L"secret\*(R"
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fixedinfo value \*(L"label\*(R", salt of \*(L"salt\*(R" and \s-1KMAC\s0 outlen of 20:
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.PP
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.Vb 4
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\& EVP_KDF *kdf;
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\& EVP_KDF_CTX *kctx;
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\& unsigned char out[10];
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\& OSSL_PARAM params[6], *p = params;
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\&
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\& kdf = EVP_KDF_fetch(NULL, "SSKDF", NULL);
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\& kctx = EVP_KDF_CTX_new(kdf);
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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_MAC,
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\& SN_kmac128, strlen(SN_kmac128));
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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_INFO,
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\& "label", (size_t)5);
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\& *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
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\& "salt", (size_t)4);
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\& *p++ = OSSL_PARAM_construct_size_t(OSSL_KDF_PARAM_MAC_SIZE, (size_t)20);
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\& *p = OSSL_PARAM_construct_end();
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\& if (EVP_KDF_derive(kctx, out, sizeof(out), params) <= 0) {
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\& error("EVP_KDF_derive");
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\& }
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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-1NIST\s0 SP800\-56Cr1.
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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_CTX_get_kdf_size\fR\|(3),
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\&\fIEVP_KDF_derive\fR\|(3),
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\&\*(L"\s-1PARAMETERS\*(R"\s0 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 in OpenSSL 3.0.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2019\-2023 The OpenSSL Project Authors. All Rights Reserved. Copyright
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(c) 2019, Oracle and/or its affiliates. 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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