diff options
Diffstat (limited to 'crypto/asymmetric_keys/public_key.c')
| -rw-r--r-- | crypto/asymmetric_keys/public_key.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c index 4fefb219bfdc..e36213945686 100644 --- a/crypto/asymmetric_keys/public_key.c +++ b/crypto/asymmetric_keys/public_key.c @@ -325,6 +325,21 @@ int public_key_verify_signature(const struct public_key *pkey, BUG_ON(!sig); BUG_ON(!sig->s); + /* + * If the signature specifies a public key algorithm, it *must* match + * the key's actual public key algorithm. + * + * Small exception: ECDSA signatures don't specify the curve, but ECDSA + * keys do. So the strings can mismatch slightly in that case: + * "ecdsa-nist-*" for the key, but "ecdsa" for the signature. + */ + if (sig->pkey_algo) { + if (strcmp(pkey->pkey_algo, sig->pkey_algo) != 0 && + (strncmp(pkey->pkey_algo, "ecdsa-", 6) != 0 || + strcmp(sig->pkey_algo, "ecdsa") != 0)) + return -EKEYREJECTED; + } + ret = software_key_determine_akcipher(sig->encoding, sig->hash_algo, pkey, alg_name); |