EVP_verify APIs

[Gayathri Manoj]

Hi All,

How can I replace RSA_public_decrypt() with EVP_Verify*().

I  wanted to replace the below api with EVP_verify*()

RSA_public_decrypt(Len, SgnData, dBuffer,  rsa_pub_key, RSA_PKCS1_PADDING);

I have tried with

EVP_MD_CTX     md_ctx;
unsigned char *decryptBuffer = NULL;
EVP_PKEY *pubKey = NULL;
PubKey = X509_get_pubkey(X509cert);
decryptBuf = (uchar *) malloc(EVP_MD_size(EVP_sha1()));

EVP_VerifyInit(&md_ctx, EVP_sha1());
EVP_VerifyUpdate (&md_ctx, dBuffer, strlen(dBuffer)-1);
errorCode = EVP_VerifyFinal(&md_ctx, SgnData, Len, PubKey);

Getting errorCode as 0. ERR[bad signature]

certificate's Signature Algorithm is SHA256withRSA

Please let me know how can I solve this issue.

Thanks,
Gayathri