diff options
Diffstat (limited to 'src/pk_pad/eme1/eme1.cpp')
| -rw-r--r-- | src/pk_pad/eme1/eme1.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/pk_pad/eme1/eme1.cpp b/src/pk_pad/eme1/eme1.cpp index b5f2af6d3..e5db17df6 100644 --- a/src/pk_pad/eme1/eme1.cpp +++ b/src/pk_pad/eme1/eme1.cpp @@ -42,6 +42,14 @@ SecureVector<byte> EME1::pad(const byte in[], u32bit in_length, SecureVector<byte> EME1::unpad(const byte in[], u32bit in_length, u32bit key_length) const { + /* + Must be careful about error messages here; if an attacker can + distinguish them, it is easy to use the differences as an oracle to + find the secret key, as described in "A Chosen Ciphertext Attack on + RSA Optimal Asymmetric Encryption Padding (OAEP) as Standardized in + PKCS #1 v2.0", James Manger, Crypto 2001 + */ + key_length /= 8; if(in_length > key_length) throw Decoding_Error("Invalid EME1 encoding"); |