(in the code, "sigalg" is used to refer to these composite algorithms,
which is a nod to libcrypto and libssl, where that term is commonly used
for composite algorithms)
To make this implementation possible, wrappers were added around the hash
function itself, allowing the use of existing hash implementations through
their respective OSSL_DISPATCH tables, but also retaining the dynamic fetch
of hash implementations when the digest_sign / digest_verify functionality
is used. This wrapper allows implementing the RSA+hash composites through
simple initializer function and a custom OSSL_DISPATCH table for each.
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Neil Horman <nhorman@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/23416)
In FIPS 140-3, RSA Signing with X9.31 padding is not approved,
but verification is allowed for legacy purposes. An indicator has been added
for RSA signing with X9.31 padding.
A strict restriction on the size of the RSA modulus has been added
i.e. It must be 1024 + 256 * s (which is part of the ANSI X9.31 spec).
Added implementation comments to the X9.31 padding code
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/24021)
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Paul Yang <kaishen.yy@antfin.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24881)
This changes the logic to always do the security checks and then decide
what to do based on if this passes or not. Failure of a check causes
either a failure OR the FIPS indicator callback to be triggered.
Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24623)
FIPS 186-4 section 5 "The RSA Digital Signature Algorithm", subsection
5.5 "PKCS #1" says: "For RSASSA-PSS […] the length (in bytes) of the
salt (sLen) shall satisfy 0 <= sLen <= hLen, where hLen is the length of
the hash function output block (in bytes)."
Introduce a new option RSA_PSS_SALTLEN_AUTO_DIGEST_MAX and make it the
default. The new value will behave like RSA_PSS_SALTLEN_AUTO, but will
not use more than the digest length when signing, so that FIPS 186-4 is
not violated. This value has two advantages when compared with
RSA_PSS_SALTLEN_DIGEST: (1) It will continue to do auto-detection when
verifying signatures for maximum compatibility, where
RSA_PSS_SALTLEN_DIGEST would fail for other digest sizes. (2) It will
work for combinations where the maximum salt length is smaller than the
digest size, which typically happens with large digest sizes (e.g.,
SHA-512) and small RSA keys.
J.-S. Coron shows in "Optimal Security Proofs for PSS and Other
Signature Schemes. Advances in Cryptology – Eurocrypt 2002, volume 2332
of Lecture Notes in Computer Science, pp. 272 – 287. Springer Verlag,
2002." that longer salts than the output size of modern hash functions
do not increase security: "For example,for an application in which at
most one billion signatures will be generated, k0 = 30 bits of random
salt are actually sufficient to guarantee the same level of security as
RSA, and taking a larger salt does not increase the security level."
Signed-off-by: Clemens Lang <cllang@redhat.com>
Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19724)
Renamed some values in core_names i.e Some DH specific names were changed to use DH instead of FFC.
Added some strings values related to RSA keys.
Moved set_params related docs out of EVP_PKEY_CTX_ctrl.pod into its own file.
Updated Keyexchange and signature code and docs.
Moved some common DSA/DH docs into a shared EVP_PKEY-FFC.pod.
Moved Ed25519.pod into EVP_SIGNATURE-ED25519.pod and reworked it.
Added some usage examples. As a result of the usage examples the following change was also made:
ec allows OSSL_PKEY_PARAM_USE_COFACTOR_ECDH as a settable gen parameter.
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11610)
Pauli
Richard Levitte
pohsingwu
slontis
Clemens Lang
Allan
Pauli
Matt Caswell
Rich Salz