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use EVP interface for DSA sign/verify with OpenSSL 3

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orignal 2025-03-23 18:53:32 -04:00
parent a193186935
commit 75d5c6036e
4 changed files with 227 additions and 68 deletions
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164
libi2pd/Signature.cpp
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@ -7,6 +7,10 @@
*/
#include <memory>
#include <openssl/evp.h>
#if (OPENSSL_VERSION_NUMBER >= 0x030000000) // since 3.0.0
#include <openssl/core_names.h>
#endif
#include "Log.h"
#include "Signature.h"
@ -14,6 +18,163 @@ namespace i2p
{
namespace crypto
{
#if (OPENSSL_VERSION_NUMBER >= 0x030000000) // since 3.0.0
DSAVerifier::DSAVerifier ():
m_PublicKey (nullptr)
{
}
DSAVerifier::~DSAVerifier ()
{
if (m_PublicKey)
EVP_PKEY_free (m_PublicKey);
}
void DSAVerifier::SetPublicKey (const uint8_t * signingKey)
{
if (m_PublicKey)
EVP_PKEY_free (m_PublicKey);
BIGNUM * pub = BN_bin2bn (signingKey, DSA_PUBLIC_KEY_LENGTH, NULL);
m_PublicKey = CreateDSA (pub);
BN_free (pub);
}
bool DSAVerifier::Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
{
// calculate SHA1 digest
uint8_t digest[20], sign[48];
SHA1 (buf, len, digest);
// signature
DSA_SIG * sig = DSA_SIG_new();
DSA_SIG_set0 (sig, BN_bin2bn (signature, DSA_SIGNATURE_LENGTH/2, NULL), BN_bin2bn (signature + DSA_SIGNATURE_LENGTH/2, DSA_SIGNATURE_LENGTH/2, NULL));
// to DER format
uint8_t * s = sign;
auto l = i2d_DSA_SIG (sig, &s);
DSA_SIG_free(sig);
// verify
auto ctx = EVP_PKEY_CTX_new (m_PublicKey, NULL);
EVP_PKEY_verify_init(ctx);
EVP_PKEY_CTX_set_signature_md(ctx, EVP_sha1());
bool ret = EVP_PKEY_verify(ctx, sign, l, digest, 20);
EVP_PKEY_CTX_free(ctx);
return ret;
}
DSASigner::DSASigner (const uint8_t * signingPrivateKey, const uint8_t * signingPublicKey)
{
BIGNUM * priv = BN_bin2bn (signingPrivateKey, DSA_PRIVATE_KEY_LENGTH, NULL);
m_PrivateKey = CreateDSA (nullptr, priv);
BN_free (priv);
}
DSASigner::~DSASigner ()
{
if (m_PrivateKey)
EVP_PKEY_free (m_PrivateKey);
}
void DSASigner::Sign (const uint8_t * buf, int len, uint8_t * signature) const
{
uint8_t digest[20], sign[48];
SHA1 (buf, len, digest);
auto ctx = EVP_PKEY_CTX_new (m_PrivateKey, NULL);
EVP_PKEY_sign_init(ctx);
EVP_PKEY_CTX_set_signature_md(ctx, EVP_sha1());
size_t l = 48;
EVP_PKEY_sign(ctx, sign, &l, digest, 20);
const uint8_t * s1 = sign;
DSA_SIG * sig = d2i_DSA_SIG (NULL, &s1, l);
const BIGNUM * r, * s;
DSA_SIG_get0 (sig, &r, &s);
bn2buf (r, signature, DSA_SIGNATURE_LENGTH/2);
bn2buf (s, signature + DSA_SIGNATURE_LENGTH/2, DSA_SIGNATURE_LENGTH/2);
DSA_SIG_free(sig);
EVP_PKEY_CTX_free(ctx);
}
void CreateDSARandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
{
EVP_PKEY * paramskey = CreateDSA();
EVP_PKEY_CTX * ctx = EVP_PKEY_CTX_new_from_pkey(NULL, paramskey, NULL);
EVP_PKEY_keygen_init(ctx);
EVP_PKEY * pkey = nullptr;
EVP_PKEY_keygen(ctx, &pkey);
BIGNUM * pub = NULL, * priv = NULL;
EVP_PKEY_get_bn_param(pkey, OSSL_PKEY_PARAM_PUB_KEY, &pub);
bn2buf (pub, signingPublicKey, DSA_PUBLIC_KEY_LENGTH);
EVP_PKEY_get_bn_param(pkey, OSSL_PKEY_PARAM_PRIV_KEY, &priv);
bn2buf (priv, signingPrivateKey, DSA_PRIVATE_KEY_LENGTH);
BN_free (pub); BN_free (priv);
EVP_PKEY_free (pkey);
EVP_PKEY_free (paramskey);
EVP_PKEY_CTX_free (ctx);
}
#else
DSAVerifier::DSAVerifier ()
{
m_PublicKey = CreateDSA ();
}
DSAVerifier::~DSAVerifier ()
{
DSA_free (m_PublicKey);
}
void DSAVerifier::SetPublicKey (const uint8_t * signingKey)
{
DSA_set0_key (m_PublicKey, BN_bin2bn (signingKey, DSA_PUBLIC_KEY_LENGTH, NULL), NULL);
}
bool DSAVerifier::Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
{
// calculate SHA1 digest
uint8_t digest[20];
SHA1 (buf, len, digest);
// signature
DSA_SIG * sig = DSA_SIG_new();
DSA_SIG_set0 (sig, BN_bin2bn (signature, DSA_SIGNATURE_LENGTH/2, NULL), BN_bin2bn (signature + DSA_SIGNATURE_LENGTH/2, DSA_SIGNATURE_LENGTH/2, NULL));
// DSA verification
int ret = DSA_do_verify (digest, 20, sig, m_PublicKey);
DSA_SIG_free(sig);
return ret;
}
DSASigner::DSASigner (const uint8_t * signingPrivateKey, const uint8_t * signingPublicKey)
{
m_PrivateKey = CreateDSA ();
DSA_set0_key (m_PrivateKey, BN_bin2bn (signingPublicKey, DSA_PUBLIC_KEY_LENGTH, NULL), BN_bin2bn (signingPrivateKey, DSA_PRIVATE_KEY_LENGTH, NULL));
}
DSASigner::~DSASigner ()
{
DSA_free (m_PrivateKey);
}
void DSASigner::Sign (const uint8_t * buf, int len, uint8_t * signature) const
{
uint8_t digest[20];
SHA1 (buf, len, digest);
DSA_SIG * sig = DSA_do_sign (digest, 20, m_PrivateKey);
const BIGNUM * r, * s;
DSA_SIG_get0 (sig, &r, &s);
bn2buf (r, signature, DSA_SIGNATURE_LENGTH/2);
bn2buf (s, signature + DSA_SIGNATURE_LENGTH/2, DSA_SIGNATURE_LENGTH/2);
DSA_SIG_free(sig);
}
void CreateDSARandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
{
DSA * dsa = CreateDSA ();
DSA_generate_key (dsa);
const BIGNUM * pub_key, * priv_key;
DSA_get0_key(dsa, &pub_key, &priv_key);
bn2buf (priv_key, signingPrivateKey, DSA_PRIVATE_KEY_LENGTH);
bn2buf (pub_key, signingPublicKey, DSA_PUBLIC_KEY_LENGTH);
DSA_free (dsa);
}
#endif
#if OPENSSL_EDDSA
EDDSA25519Verifier::EDDSA25519Verifier ():
m_Pkey (nullptr)
@ -202,8 +363,7 @@ namespace crypto
#endif
#if OPENSSL_PQ
#include <openssl/core_names.h>
MLDSA44Verifier::MLDSA44Verifier ():
m_Pkey (nullptr)
{