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//opt/cpanel/ea-openssl11/share/man/man3/EVP_PKEY_CTX_set_tls1_prf_md.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" EVP_PKEY_CTX_set_tls1_prf_md, EVP_PKEY_CTX_set1_tls1_prf_secret, EVP_PKEY_CTX_add1_tls1_prf_seed \- TLS PRF key derivation algorithm .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/kdf.h> \& \& int EVP_PKEY_CTX_set_tls1_prf_md(EVP_PKEY_CTX *pctx, const EVP_MD *md); \& int EVP_PKEY_CTX_set1_tls1_prf_secret(EVP_PKEY_CTX *pctx, \& unsigned char *sec, int seclen); \& int EVP_PKEY_CTX_add1_tls1_prf_seed(EVP_PKEY_CTX *pctx, \& unsigned char *seed, int seedlen); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" The \fB\s-1EVP_PKEY_TLS1_PRF\s0\fR algorithm implements the \s-1PRF\s0 key derivation function for \&\s-1TLS.\s0 It has no associated private key and only implements key derivation using \fIEVP_PKEY_derive\fR\|(3). .PP \&\fIEVP_PKEY_set_tls1_prf_md()\fR sets the message digest associated with the \&\s-1TLS PRF.\s0 \fIEVP_md5_sha1()\fR is treated as a special case which uses the \s-1PRF\s0 algorithm using both \fB\s-1MD5\s0\fR and \fB\s-1SHA1\s0\fR as used in \s-1TLS 1.0\s0 and 1.1. .PP \&\fIEVP_PKEY_CTX_set_tls1_prf_secret()\fR sets the secret value of the \s-1TLS PRF\s0 to \fBseclen\fR bytes of the buffer \fBsec\fR. Any existing secret value is replaced and any seed is reset. .PP \&\fIEVP_PKEY_CTX_add1_tls1_prf_seed()\fR sets the seed to \fBseedlen\fR bytes of \fBseed\fR. If a seed is already set it is appended to the existing value. .SH "STRING CTRLS" .IX Header "STRING CTRLS" The \s-1TLS PRF\s0 also supports string based control operations using \&\fIEVP_PKEY_CTX_ctrl_str\fR\|(3). The \fBtype\fR parameter \*(L"md\*(R" uses the supplied \fBvalue\fR as the name of the digest algorithm to use. The \fBtype\fR parameters \*(L"secret\*(R" and \*(L"seed\*(R" use the supplied \fBvalue\fR parameter as a secret or seed value. The names \*(L"hexsecret\*(R" and \*(L"hexseed\*(R" are similar except they take a hex string which is converted to binary. .SH "NOTES" .IX Header "NOTES" All these functions are implemented as macros. .PP A context for the \s-1TLS PRF\s0 can be obtained by calling: .PP .Vb 1 \& EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_TLS1_PRF, NULL); .Ve .PP The digest, secret value and seed must be set before a key is derived or an error occurs. .PP The total length of all seeds cannot exceed 1024 bytes in length: this should be more than enough for any normal use of the \s-1TLS PRF.\s0 .PP The output length of the \s-1PRF\s0 is specified by the length parameter in the \&\fIEVP_PKEY_derive()\fR function. Since the output length is variable, setting the buffer to \fB\s-1NULL\s0\fR is not meaningful for the \s-1TLS PRF.\s0 .PP Optimised versions of the \s-1TLS PRF\s0 can be implemented in an \s-1ENGINE.\s0 .SH "RETURN VALUES" .IX Header "RETURN VALUES" All these functions return 1 for success and 0 or a negative value for failure. In particular a return value of \-2 indicates the operation is not supported by the public key algorithm. .SH "EXAMPLES" .IX Header "EXAMPLES" This example derives 10 bytes using \s-1SHA\-256\s0 with the secret key \*(L"secret\*(R" and seed value \*(L"seed\*(R": .PP .Vb 3 \& EVP_PKEY_CTX *pctx; \& unsigned char out[10]; \& size_t outlen = sizeof(out); \& \& pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_TLS1_PRF, NULL); \& if (EVP_PKEY_derive_init(pctx) <= 0) \& /* Error */ \& if (EVP_PKEY_CTX_set_tls1_prf_md(pctx, EVP_sha256()) <= 0) \& /* Error */ \& if (EVP_PKEY_CTX_set1_tls1_prf_secret(pctx, "secret", 6) <= 0) \& /* Error */ \& if (EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, "seed", 4) <= 0) \& /* Error */ \& if (EVP_PKEY_derive(pctx, out, &outlen) <= 0) \& /* Error */ .Ve .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIEVP_PKEY_CTX_new\fR\|(3), \&\fIEVP_PKEY_CTX_ctrl_str\fR\|(3), \&\fIEVP_PKEY_derive\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2016\-2019 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
