diff options
| -rw-r--r-- | crypto/asymmetric_keys/rsa.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/crypto/asymmetric_keys/rsa.c b/crypto/asymmetric_keys/rsa.c index 9b31ee25a459..4a6a0696f8a3 100644 --- a/crypto/asymmetric_keys/rsa.c +++ b/crypto/asymmetric_keys/rsa.c @@ -224,15 +224,23 @@ static int RSA_verify_signature(const struct public_key *key, return -ENOTSUPP; /* (1) Check the signature size against the public key modulus size */ - k = (mpi_get_nbits(key->rsa.n) + 7) / 8; + k = mpi_get_nbits(key->rsa.n); + tsize = mpi_get_nbits(sig->rsa.s); - tsize = (mpi_get_nbits(sig->rsa.s) + 7) / 8; + /* According to RFC 4880 sec 3.2, length of MPI is computed starting + * from most significant bit. So the RFC 3447 sec 8.2.2 size check + * must be relaxed to conform with shorter signatures - so we fail here + * only if signature length is longer than modulus size. + */ pr_devel("step 1: k=%zu size(S)=%zu\n", k, tsize); - if (tsize != k) { + if (k < tsize) { ret = -EBADMSG; goto error; } + /* Round up and convert to octets */ + k = (k + 7) / 8; + /* (2b) Apply the RSAVP1 verification primitive to the public key */ ret = RSAVP1(key, sig->rsa.s, &m); if (ret < 0) |