259 lines
10 KiB
Plaintext
259 lines
10 KiB
Plaintext
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.\" ========================================================================
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.\"
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.IX Title "EVP_SIGNATURE-SLH-DSA 7ossl"
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.TH EVP_SIGNATURE-SLH-DSA 7ossl "2025-04-23" "3.5.1-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_SIGNATURE\-SLH\-DSA,
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EVP_SIGNATURE\-SLH\-DSA\-SHA2\-128s, EVP_SIGNATURE\-SLH\-DSA\-SHA2\-128f,
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EVP_SIGNATURE\-SLH\-DSA\-SHA2\-192s, EVP_SIGNATURE\-SLH\-DSA\-SHA2\-192f,
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EVP_SIGNATURE\-SLH\-DSA\-SHA2\-256s, EVP_SIGNATURE\-SLH\-DSA\-SHA2\-256f,
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EVP_SIGNATURE\-SLH\-DSA\-SHAKE\-128s, EVP_SIGNATURE\-SLH\-DSA\-SHAKE\-128f,
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EVP_SIGNATURE\-SLH\-DSA\-SHAKE\-192s, EVP_SIGNATURE\-SLH\-DSA\-SHAKE\-192f,
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EVP_SIGNATURE\-SLH\-DSA\-SHAKE\-256s, EVP_SIGNATURE\-SLH\-DSA\-SHAKE\-256f
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\&\- EVP_PKEY SLH\-DSA support
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \fBSLH\-DSA\-SHA2\-128s\fR, \fBEVP_PKEY\-SLH\-DSA\-SHA2\-128f\fR,
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\&\fBSLH\-DSA\-SHA2\-192s\fR, \fBEVP_PKEY\-SLH\-DSA\-SHA2\-192f\fR,
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\&\fBSLH\-DSA\-SHA2\-256s\fR, \fBEVP_PKEY\-SLH\-DSA\-SHA2\-256f\fR,
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\&\fBSLH\-DSA\-SHAKE\-128s\fR, \fBEVP_PKEY\-SLH\-DSA\-SHAKE\-128f\fR,
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\&\fBSLH\-DSA\-SHAKE\-192s\fR, \fBEVP_PKEY\-SLH\-DSA\-SHAKE\-192f\fR,
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\&\fBSLH\-DSA\-SHAKE\-256s\fR and \fBEVP_PKEY\-SLH\-DSA\-SHAKE\-256f\fR \s-1EVP_PKEY\s0 implementations
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supports key generation, one-shot sign and verify using the SLH-DSA
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signature schemes described in \s-1FIPS 205.\s0
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.PP
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The different algorithms names correspond to the parameter sets defined in
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\&\s-1FIPS 205\s0 Section 11 Table 2.
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\&\f(CW\*(C`s\*(C'\fR types have smaller signature sizes, and the \f(CW\*(C`f\*(C'\fR variants are faster,
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(The signatures range from ~8K to ~50K depending on the type chosen). There are
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3 different security categories also depending on the type.
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.PP
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\&\fIEVP_SIGNATURE_fetch\fR\|(3) can be used to explicitely fetch one of the 12
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algorithms which can then be used with \fIEVP_PKEY_sign_message_init\fR\|(3),
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\&\fIEVP_PKEY_sign\fR\|(3), \fIEVP_PKEY_verify_message_init\fR\|(3), and
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\&\fIEVP_PKEY_verify\fR\|(3) to perform one-shot message signing or verification.
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.PP
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The normal signing process (called Pure SLH-DSA Signature Generation)
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encodes the message internally as 0x00 || len(ctx) || ctx || message.
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where \fBctx\fR is some optional value of size 0x00..0xFF.
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OpenSSL also allows the message to not be encoded which is required for
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testing. OpenSSL does not support Pre Hash SLH-DSA Signature Generation, but this
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may be done by the user by doing Pre hash encoding externally and then chosing
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the option to not encode the message.
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.SS "SLH-DSA Signature Parameters"
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.IX Subsection "SLH-DSA Signature Parameters"
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The \f(CW\*(C`context\-string\*(C'\fR parameter, described below, can be used for both signing
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and verification.
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It may be set by passing an \s-1OSSL_PARAM\s0 array to \fIEVP_PKEY_sign_init_ex2\fR\|(3) or
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\&\fIEVP_PKEY_verify_init_ex2\fR\|(3)
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.ie n .IP """context-string"" (\fB\s-1OSSL_SIGNATURE_PARAM_CONTEXT_STRING\s0\fR) <octet string>" 4
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.el .IP "``context-string'' (\fB\s-1OSSL_SIGNATURE_PARAM_CONTEXT_STRING\s0\fR) <octet string>" 4
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.IX Item "context-string (OSSL_SIGNATURE_PARAM_CONTEXT_STRING) <octet string>"
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A string of octets with length at most 255. By default it is the empty string.
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.PP
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The following parameters can be used when signing:
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They can be set by passing an \s-1OSSL_PARAM\s0 array to \fIEVP_PKEY_sign_init_ex2\fR\|(3).
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.ie n .IP """message-encoding"" (\fB\s-1OSSL_SIGNATURE_PARAM_MESSAGE_ENCODING\s0\fR) <integer>" 4
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.el .IP "``message-encoding'' (\fB\s-1OSSL_SIGNATURE_PARAM_MESSAGE_ENCODING\s0\fR) <integer>" 4
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.IX Item "message-encoding (OSSL_SIGNATURE_PARAM_MESSAGE_ENCODING) <integer>"
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The default value of 1 uses 'Pure SLH-DSA Signature Generation' as described
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above. Setting it to 0 does not encode the message, which is used for testing,
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but can also be used for 'Pre Hash SLH-DSA Signature Generation'.
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.ie n .IP """test-entropy"" (\fB\s-1OSSL_SIGNATURE_PARAM_TEST_ENTROPY\s0 <octet string\fR" 4
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.el .IP "``test-entropy'' (\fB\s-1OSSL_SIGNATURE_PARAM_TEST_ENTROPY\s0 <octet string\fR" 4
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.IX Item "test-entropy (OSSL_SIGNATURE_PARAM_TEST_ENTROPY <octet string"
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Used for testing to pass a optional random value.
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.ie n .IP """deterministic"" (\fB\s-1OSSL_SIGNATURE_PARAM_DETERMINISTIC\s0\fR) <integer>" 4
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.el .IP "``deterministic'' (\fB\s-1OSSL_SIGNATURE_PARAM_DETERMINISTIC\s0\fR) <integer>" 4
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.IX Item "deterministic (OSSL_SIGNATURE_PARAM_DETERMINISTIC) <integer>"
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The default value of 0 generates a random value (using a \s-1DRBG\s0) this is used when
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processing the message. Setting this to 1 causes the private key seed to be used
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instead. This value is ignored if \*(L"test-entropy\*(R" is set.
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.PP
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See \s-1\fIEVP_PKEY\-SLH\-DSA\s0\fR\|(7) for information related to \fBSLH-DSA\fR keys.
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.SH "NOTES"
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.IX Header "NOTES"
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For backwards compatibility reasons \fIEVP_DigestSignInit_ex()\fR, \fIEVP_DigestSign()\fR,
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\&\fIEVP_DigestVerifyInit_ex()\fR and \fIEVP_DigestVerify()\fR may also be used, but the digest
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passed in \fImdname\fR must be \s-1NULL.\s0
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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To sign a message using an SLH-DSA \s-1EVP_PKEY\s0 structure:
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.PP
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.Vb 10
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\& void do_sign(EVP_PKEY *key, unsigned char *msg, size_t msg_len)
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\& {
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\& size_t sig_len;
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\& unsigned char *sig = NULL;
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\& const OSSL_PARAM params[] = {
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\& OSSL_PARAM_octet_string("context\-string", (unsigned char *)"A context string", 33),
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\& OSSL_PARAM_END
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\& };
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\& EVP_PKEY_CTX *sctx = EVP_PKEY_CTX_new_from_pkey(NULL, pkey, NULL);
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\& EVP_SIGNATURE *sig_alg = EVP_SIGNATURE_fetch(NULL, "SLH\-DSA\-SHA2\-128s", NULL);
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\&
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\& EVP_PKEY_sign_message_init(sctx, sig_alg, params);
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\& /* Calculate the required size for the signature by passing a NULL buffer. */
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\& EVP_PKEY_sign(sctx, NULL, &sig_len, msg, msg_len);
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\& sig = OPENSSL_zalloc(sig_len);
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\& EVP_PKEY_sign(sctx, sig, &sig_len, msg, msg_len);
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\& ...
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\& OPENSSL_free(sig);
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\& EVP_SIGNATURE(sig_alg);
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\& EVP_PKEY_CTX_free(sctx);
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\& }
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.Ve
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\s-1\fIEVP_PKEY\-SLH\-DSA\s0\fR\|(7)
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\&\fIprovider\-signature\fR\|(7),
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\&\fIEVP_PKEY_sign\fR\|(3),
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\&\fIEVP_PKEY_verify\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 3.5.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2024\-2025 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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