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authorDavid Howells <dhowells@redhat.com>2016-03-04 00:49:27 +0300
committerDavid Howells <dhowells@redhat.com>2016-03-04 00:49:27 +0300
commitd43de6c780a84def056afaf4fb3e66bdaa1efc00 (patch)
treef6221a2761cd7fbdb9c5bdc3e82b6dbfef90430a /crypto/asymmetric_keys/Kconfig
parenta49de377e051eac5bc50a3b838614a05671da4e7 (diff)
downloadlinux-d43de6c780a84def056afaf4fb3e66bdaa1efc00.tar.xz
akcipher: Move the RSA DER encoding check to the crypto layer
Move the RSA EMSA-PKCS1-v1_5 encoding from the asymmetric-key public_key subtype to the rsa crypto module's pkcs1pad template. This means that the public_key subtype no longer has any dependencies on public key type. To make this work, the following changes have been made: (1) The rsa pkcs1pad template is now used for RSA keys. This strips off the padding and returns just the message hash. (2) In a previous patch, the pkcs1pad template gained an optional second parameter that, if given, specifies the hash used. We now give this, and pkcs1pad checks the encoded message E(M) for the EMSA-PKCS1-v1_5 encoding and verifies that the correct digest OID is present. (3) The crypto driver in crypto/asymmetric_keys/rsa.c is now reduced to something that doesn't care about what the encryption actually does and and has been merged into public_key.c. (4) CONFIG_PUBLIC_KEY_ALGO_RSA is gone. Module signing must set CONFIG_CRYPTO_RSA=y instead. Thoughts: (*) Should the encoding style (eg. raw, EMSA-PKCS1-v1_5) also be passed to the padding template? Should there be multiple padding templates registered that share most of the code? Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/asymmetric_keys/Kconfig')
-rw-r--r--crypto/asymmetric_keys/Kconfig7
1 files changed, 0 insertions, 7 deletions
diff --git a/crypto/asymmetric_keys/Kconfig b/crypto/asymmetric_keys/Kconfig
index 905d745c2f85..91a7e047a765 100644
--- a/crypto/asymmetric_keys/Kconfig
+++ b/crypto/asymmetric_keys/Kconfig
@@ -12,7 +12,6 @@ if ASYMMETRIC_KEY_TYPE
config ASYMMETRIC_PUBLIC_KEY_SUBTYPE
tristate "Asymmetric public-key crypto algorithm subtype"
select MPILIB
- select PUBLIC_KEY_ALGO_RSA
select CRYPTO_HASH_INFO
help
This option provides support for asymmetric public key type handling.
@@ -20,12 +19,6 @@ config ASYMMETRIC_PUBLIC_KEY_SUBTYPE
appropriate hash algorithms (such as SHA-1) must be available.
ENOPKG will be reported if the requisite algorithm is unavailable.
-config PUBLIC_KEY_ALGO_RSA
- tristate "RSA public-key algorithm"
- select CRYPTO_RSA
- help
- This option enables support for the RSA algorithm (PKCS#1, RFC3447).
-
config X509_CERTIFICATE_PARSER
tristate "X.509 certificate parser"
depends on ASYMMETRIC_PUBLIC_KEY_SUBTYPE