Shift ECDSA inputs to match OpenSSL behavior

See also GH #986

2 files changed, 4 insertions, 4 deletions

diff --git a/src/lib/pubkey/ecdsa/ecdsa.cpp b/src/lib/pubkey/ecdsa/ecdsa.cpp
index 6ff02e8c9..f35693189 100644
--- a/src/lib/pubkey/ecdsa/ecdsa.cpp
+++ b/src/lib/pubkey/ecdsa/ecdsa.cpp
@@ -81,7 +81,7 @@ secure_vector<uint8_t>
 ECDSA_Signature_Operation::raw_sign(const uint8_t msg[], size_t msg_len,
                                     RandomNumberGenerator& rng)
    {
-   const BigInt m(msg, msg_len);
+   BigInt m(msg, msg_len, m_group.get_order_bits());
 
 #if defined(BOTAN_HAS_RFC6979_GENERATOR)
    const BigInt k = generate_rfc6979_nonce(m_x, m_group.get_order(), m, m_rfc6979_hash);
@@ -134,7 +134,7 @@ bool ECDSA_Verification_Operation::verify(const uint8_t msg[], size_t msg_len,
    if(sig_len != m_group.get_order_bytes() * 2)
       return false;
 
-   const BigInt e(msg, msg_len);
+   const BigInt e(msg, msg_len, m_group.get_order_bits());
 
    const BigInt r(sig, sig_len / 2);
    const BigInt s(sig + sig_len / 2, sig_len / 2);
diff --git a/src/lib/pubkey/ecgdsa/ecgdsa.cpp b/src/lib/pubkey/ecgdsa/ecgdsa.cpp
index db790b0d1..12962d18c 100644
--- a/src/lib/pubkey/ecgdsa/ecgdsa.cpp
+++ b/src/lib/pubkey/ecgdsa/ecgdsa.cpp
@@ -57,7 +57,7 @@ secure_vector<uint8_t>
 ECGDSA_Signature_Operation::raw_sign(const uint8_t msg[], size_t msg_len,
                                      RandomNumberGenerator& rng)
    {
-   const BigInt m(msg, msg_len);
+   const BigInt m(msg, msg_len, m_group.get_order_bits());
 
    BigInt k = BigInt::random_integer(rng, 1, m_group.get_order());
 
@@ -107,7 +107,7 @@ bool ECGDSA_Verification_Operation::verify(const uint8_t msg[], size_t msg_len,
    if(sig_len != m_group.get_order_bytes() * 2)
       return false;
 
-   const BigInt e(msg, msg_len);
+   const BigInt e(msg, msg_len, m_group.get_order_bits());
 
    const BigInt r(sig, sig_len / 2);
    const BigInt s(sig + sig_len / 2, sig_len / 2);