Specifies the name of a supported KDF algorithm which will be used.
The supported algorithms names include TLS1-PRF, HKDF, SSKDF, PBKDF2,
-SSHKDF, X942KDF, X963KDF and id-scrypt.
+SSHKDF, X942KDF, X963KDF and SCRYPT.
=back
Use TLS1-PRF to create a hex-encoded derived key from a secret key and seed:
- openssl kdf -keylen 16 -kdfopt digest:SHA256 -kdfopt key:secret \
+ openssl kdf -keylen 16 -kdfopt digest:SHA2-256 -kdfopt key:secret \
-kdfopt seed:seed TLS1-PRF
Use HKDF to create a hex-encoded derived key from a secret key, salt and info:
- openssl kdf -keylen 10 -kdfopt digest:SHA256 -kdfopt key:secret \
+ openssl kdf -keylen 10 -kdfopt digest:SHA2-256 -kdfopt key:secret \
-kdfopt salt:salt -kdfopt info:label HKDF
Use SSKDF with KMAC to create a hex-encoded derived key from a secret key, salt and info:
- openssl kdf -keylen 64 -kdfopt mac:KMAC128 -kdfopt maclen:20 \
+ openssl kdf -keylen 64 -kdfopt mac:KMAC-128 -kdfopt maclen:20 \
-kdfopt hexkey:b74a149a161545 -kdfopt hexinfo:348a37a2 \
-kdfopt hexsalt:3638271ccd68a2 SSKDF
Use SSKDF with HMAC to create a hex-encoded derived key from a secret key, salt and info:
- openssl kdf -keylen 16 -kdfopt mac:HMAC -kdfopt digest:SHA256 \
+ openssl kdf -keylen 16 -kdfopt mac:HMAC -kdfopt digest:SHA2-256 \
-kdfopt hexkey:b74a149a -kdfopt hexinfo:348a37a2 \
-kdfopt hexsalt:3638271c SSKDF
Use SSKDF with Hash to create a hex-encoded derived key from a secret key, salt and info:
- openssl kdf -keylen 14 -kdfopt digest:SHA256 \
+ openssl kdf -keylen 14 -kdfopt digest:SHA2-256 \
-kdfopt hexkey:6dbdc23f045488 \
-kdfopt hexinfo:a1b2c3d4 SSKDF
Use SSHKDF to create a hex-encoded derived key from a secret key, hash and session_id:
- openssl kdf -keylen 16 -kdfopt digest:SHA256 \
+ openssl kdf -keylen 16 -kdfopt digest:SHA2-256 \
-kdfopt hexkey:0102030405 \
-kdfopt hexxcghash:06090A \
-kdfopt hexsession_id:01020304 \
openssl kdf -keylen 64 -kdfopt pass:password -kdfopt salt:NaCl \
-kdfopt N:1024 -kdfopt r:8 -kdfopt p:16 \
- -kdfopt maxmem_bytes:10485760 id-scrypt
+ -kdfopt maxmem_bytes:10485760 SCRYPT
=head1 NOTES
default search criteria and an algorithm name that is consistent with
the type of EVP_PKEY being used.
-=head1 OPENSSL PROVIDERS
+=head3 Algorithm naming
-OpenSSL comes with a set of providers.
-All the algorithm names mentioned can be used as an algorithm
-identifier to the appropriate fetching function.
+Algorithm names are case insensitive. Any particular algorithm can have multiple
+aliases associated with it. The canonical OpenSSL naming scheme follows this
+format:
-=head2 Default provider
+ALGNAME[VERSION?][-SUBNAME[VERSION?]?][-SIZE?][-MODE?]
-The default provider is built in as part of the F<libcrypto> library.
-Should it be needed (if other providers are loaded and offer
-implementations of the same algorithms), the property "default=yes"
-can be used as a search criterion for these implementations.
+VERSION is only present if there are multiple versions of an algorithm (e.g.
+MD2, MD4, MD5). It may be omitted if there is only one version.
-It currently offers the following named algorithms:
+SUBNAME may be present where multiple algorithms are combined together,
+e.g. MD5-SHA1.
-=over 4
+SIZE is only present if multiple versions of an algorithm exist with different
+sizes (e.g. AES-128-CBC, AES-256-CBC)
-=item Digests
+MODE is only present where applicable.
-SHA1, SHA224, SHA256, SHA384, SHA512, SHA512-224, SHA512-256,
-SHA3-224, SHA3-256, SHA3-384, SHA3-512, SHAKE128, SHAKE256, SM3,
-BLAKE2b512, BLAKE2s256, KMAC128, KMAC256, MD5, MD5-SHA1
+Other aliases may exist for example where standards bodies or common practice
+use alternative names or names that OpenSSL has used historically.
-=item Symmetric ciphers
+=head1 OPENSSL PROVIDERS
-AES-256-ECB, AES-192-ECB, AES-128-ECB, AES-256-CBC, AES-192-CBC,
-AES-128-CBC, AES-256-OFB, AES-192-OFB, AES-128-OFB, AES-256-CFB,
-AES-192-CFB, AES-128-CFB, AES-256-CFB1, AES-192-CFB1, AES-128-CFB1,
-AES-256-CFB8, AES-192-CFB8, AES-128-CFB8, AES-256-CTR, AES-192-CTR,
-AES-128-CTR, id-aes256-GCM, id-aes192-GCM, id-aes128-GCM
+OpenSSL comes with a set of providers.
-=item Key Exchange
+The algorithms available in each of these providers may vary due to build time
+configuration options. The L<openssl-list(1)> command can be used to list the
+currently available algorithms.
-dhKeyAgreement
+The names of the algorithms shown from L<openssl-list(1)> can be used as an
+algorithm identifier to the appropriate fetching function.
-=back
+=head2 Default provider
+
+The default provider is built in as part of the F<libcrypto> library.
+Should it be needed (if other providers are loaded and offer
+implementations of the same algorithms), the property "default=yes"
+can be used as a search criterion for these implementations.
=head2 FIPS provider
implementations of the same algorithms), the property "fips=yes" can
be used as a search criterion for these implementations.
-It currently offers the following FIPS approved named algorithms:
-
-=over 4
-
-=item Digests
-
-SHA1, SHA224, SHA256, SHA384, SHA512, SHA512-224, SHA512-256,
-SHA3-224, SHA3-256, SHA3-384, SHA3-512, KMAC128, KMAC256
-
-=item Symmetric ciphers
-
-AES-256-ECB, AES-192-ECB, AES-128-ECB, AES-256-CBC, AES-192-CBC,
-AES-128-CBC, AES-256-CTR, AES-192-CTR, AES-128-CTR
-
-=back
-
=head2 Legacy provider
The legacy provider is a dynamically loadable module, and must therefore
implementations of the same algorithms), the property "legacy=yes" can be
used as a search criterion for these implementations.
-It currently offers the following named algorithms:
-
-=over 4
-
-=item Digest algorithms:
-
-RIPEMD160, MD2, MD4, MDC2, whirlpool.
-
-=back
-
=head1 EXAMPLES
=head2 Fetching
-Fetch any available implementation of SHA256 in the default context:
+Fetch any available implementation of SHA2-256 in the default context:
- EVP_MD *md = EVP_MD_fetch(NULL, "SHA256", NULL);
+ EVP_MD *md = EVP_MD_fetch(NULL, "SHA2-256", NULL);
...
EVP_MD_meth_free(md);
...
EVP_CIPHER_meth_free(cipher);
-Fetch an implementation of SHA256 from the default provider in the default
+Fetch an implementation of SHA2-256 from the default provider in the default
context:
- EVP_MD *md = EVP_MD_fetch(NULL, "SHA256", "default=yes");
+ EVP_MD *md = EVP_MD_fetch(NULL, "SHA2-256", "default=yes");
...
EVP_MD_meth_free(md);
-Fetch an implementation of SHA256 that is not from the default provider in the
+Fetch an implementation of SHA2-256 that is not from the default provider in the
default context:
- EVP_MD *md = EVP_MD_fetch(NULL, "SHA256", "default=no");
+ EVP_MD *md = EVP_MD_fetch(NULL, "SHA2-256", "default=no");
...
EVP_MD_meth_free(md);
-Fetch an implementation of SHA256 from the default provider in the specified
+Fetch an implementation of SHA2-256 from the default provider in the specified
context:
- EVP_MD *md = EVP_MD_fetch(ctx, "SHA256", "default=yes");
+ EVP_MD *md = EVP_MD_fetch(ctx, "SHA2-256", "default=yes");
...
EVP_MD_meth_free(md);
Load the legacy provider into the default context and then fetch an
-implementation of whirlpool from it:
+implementation of WHIRLPOOL from it:
/* This only needs to be done once - usually at application start up */
OSSL_PROVIDER *legacy = OSSL_PROVIDER_load(NULL, "legacy");
- EVP_MD *md = EVP_MD_fetch(NULL, "whirlpool", "legacy=yes");
+ EVP_MD *md = EVP_MD_fetch(NULL, "WHIRLPOOL", "legacy=yes");
...
EVP_MD_meth_free(md);
OSSL_PROVIDER *default = OSSL_PROVIDER_load(NULL, "default");
EVP_MD *md_whirlpool = EVP_MD_fetch(NULL, "whirlpool", NULL);
- EVP_MD *md_sha256 = EVP_MD_fetch(NULL, "SHA256", NULL);
+ EVP_MD *md_sha256 = EVP_MD_fetch(NULL, "SHA2-256", NULL);
...
EVP_MD_meth_free(md_whirlpool);
EVP_MD_meth_free(md_sha256);
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