From aa4d426b4d3527d7e166df1a05058c9a4a0f6683 Mon Sep 17 00:00:00 2001 From: Wojtek Kosior Date: Fri, 30 Apr 2021 00:33:56 +0200 Subject: initial/final commit --- .../doc/crypto/EVP_PKEY_CTX_set_tls1_prf_md.pod | 108 +++++++++++++++++++++ 1 file changed, 108 insertions(+) create mode 100644 openssl-1.1.0h/doc/crypto/EVP_PKEY_CTX_set_tls1_prf_md.pod (limited to 'openssl-1.1.0h/doc/crypto/EVP_PKEY_CTX_set_tls1_prf_md.pod') diff --git a/openssl-1.1.0h/doc/crypto/EVP_PKEY_CTX_set_tls1_prf_md.pod b/openssl-1.1.0h/doc/crypto/EVP_PKEY_CTX_set_tls1_prf_md.pod new file mode 100644 index 0000000..f1f0ae4 --- /dev/null +++ b/openssl-1.1.0h/doc/crypto/EVP_PKEY_CTX_set_tls1_prf_md.pod @@ -0,0 +1,108 @@ +=pod + +=head1 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 + +=head1 SYNOPSIS + + #include + + 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); + +=head1 DESCRIPTION + +The B algorithm implements the PRF key derivation function for +TLS. It has no associated private key and only implements key derivation +using L. + +EVP_PKEY_set_tls1_prf_md() sets the message digest associated with the +TLS PRF. EVP_md5_sha1() is treated as a special case which uses the PRF +algorithm using both B and B as used in TLS 1.0 and 1.1. + +EVP_PKEY_CTX_set_tls1_prf_secret() sets the secret value of the TLS PRF +to B bytes of the buffer B. Any existing secret value is replaced +and any seed is reset. + +EVP_PKEY_CTX_add1_tls1_prf_seed() sets the seed to B bytes of B. +If a seed is already set it is appended to the existing value. + +=head1 STRING CTRLS + +The TLS PRF also supports string based control operations using +L. +The B parameter "md" uses the supplied B as the name of the digest +algorithm to use. +The B parameters "secret" and "seed" use the supplied B parameter +as a secret or seed value. +The names "hexsecret" and "hexseed" are similar except they take a hex string +which is converted to binary. + +=head1 NOTES + +All these functions are implemented as macros. + +A context for the TLS PRF can be obtained by calling: + + EVP_PKEY_CTX *pctx = EVP_PKEY_new_id(EVP_PKEY_TLS1_PRF, NULL); + +The digest, secret value and seed must be set before a key is derived or an +error occurs. + +The total length of all seeds cannot exceed 1024 bytes in length: this should +be more than enough for any normal use of the TLS PRF. + +The output length of the PRF is specified by the length parameter in the +EVP_PKEY_derive() function. Since the output length is variable, setting +the buffer to B is not meaningful for the TLS PRF. + +Optimised versions of the TLS PRF can be implemented in an ENGINE. + +=head1 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. + +=head1 EXAMPLE + +This example derives 10 bytes using SHA-256 with the secret key "secret" +and seed value "seed": + + 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 */ + +=head1 SEE ALSO + +L, +L, +L + +=head1 COPYRIGHT + +Copyright 2016 The OpenSSL Project Authors. All Rights Reserved. + +Licensed under the OpenSSL license (the "License"). You may not use +this file except in compliance with the License. You can obtain a copy +in the file LICENSE in the source distribution or at +L. + +=cut -- cgit v1.2.3