245 lines
8.4 KiB
Plaintext
245 lines
8.4 KiB
Plaintext
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.\" ========================================================================
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.\"
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.IX Title "EVP_KDF-KRB5KDF 7ossl"
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.TH EVP_KDF-KRB5KDF 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\-KRB5KDF \- The RFC3961 Krb5 KDF EVP_KDF implementation
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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Support for computing the \fB\s-1KRB5KDF\s0\fR \s-1KDF\s0 through the \fB\s-1EVP_KDF\s0\fR \s-1API.\s0
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.PP
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The \s-1EVP_KDF\-KRB5KDF\s0 algorithm implements the key derivation function defined
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in \s-1RFC 3961,\s0 section 5.1 and is used by Krb5 to derive session keys.
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Three inputs are required to perform key derivation: a cipher, (for example
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\&\s-1AES\-128\-CBC\s0), the initial key, and a constant.
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.SS "Identity"
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.IX Subsection "Identity"
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\&\*(L"\s-1KRB5KDF\*(R"\s0 is the name for this implementation;
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it 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 """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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.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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.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 """constant"" (\fB\s-1OSSL_KDF_PARAM_CONSTANT\s0\fR) <octet string>" 4
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.el .IP "``constant'' (\fB\s-1OSSL_KDF_PARAM_CONSTANT\s0\fR) <octet string>" 4
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.IX Item "constant (OSSL_KDF_PARAM_CONSTANT) <octet string>"
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This parameter sets the constant value for the \s-1KDF.\s0
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If a value is already set, the contents are replaced.
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.SH "NOTES"
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.IX Header "NOTES"
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A context for \s-1KRB5KDF\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, "KRB5KDF", 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 the \s-1KRB5KDF\s0 derivation is specified via the \fIkeylen\fR
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parameter to the \fIEVP_KDF_derive\fR\|(3) function, and \s-1MUST\s0 match the key
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length for the chosen cipher or an error is returned. Moreover, the
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constant's length must not exceed the block size of the cipher.
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Since the \s-1KRB5KDF\s0 output length depends on the chosen cipher, calling
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\&\fIEVP_KDF_CTX_get_kdf_size\fR\|(3) to obtain the requisite length returns the correct length
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only after the cipher is set. Prior to that \fB\s-1EVP_MAX_KEY_LENGTH\s0\fR is returned.
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The caller must allocate a buffer of the correct length for the chosen
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cipher, and pass that buffer to the \fIEVP_KDF_derive\fR\|(3) function along
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with that length.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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This example derives a key using the \s-1AES\-128\-CBC\s0 cipher:
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.PP
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.Vb 7
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\& EVP_KDF *kdf;
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\& EVP_KDF_CTX *kctx;
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\& unsigned char key[16] = "01234...";
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\& unsigned char constant[] = "I\*(Aqm a constant";
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\& unsigned char out[16];
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\& size_t outlen = sizeof(out);
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\& OSSL_PARAM params[4], *p = params;
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\&
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\& kdf = EVP_KDF_fetch(NULL, "KRB5KDF", 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_CIPHER,
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\& SN_aes_128_cbc,
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\& strlen(SN_aes_128_cbc));
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\& *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
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\& key, (size_t)16);
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\& *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_CONSTANT,
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\& constant, strlen(constant));
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\& *p = OSSL_PARAM_construct_end();
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\& if (EVP_KDF_derive(kctx, out, outlen, params) <= 0)
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\& /* Error */
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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 3961\s0
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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_free\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 2016\-2021 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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