BIO md

 A easier way to digest. Only notes that BIO_f_xx() algorithm is a filter BIO, can’t be used alone, you have to combine a BIO_s_xx() to go with it, which stands for a source BIO.

 

Sample function code:

unsigned char *digestBIO(unsigned char *data, int datal) {     BIO *bc=NULL,*b=NULL;     const EVP_MD *md = EVP_sha1();     static unsigned char bDigest[EVP_MAX_MD_SIZE] = {0};       bc = BIO_new (BIO_f_md());     BIO_set_md (bc, md);       b= BIO_new(BIO_s_null());     //b= BIO_new(BIO_s_mem());       b=BIO_push(bc,b);       len=BIO_write (b, data, datal);     len=BIO_gets(b,(char*)tmp, 1024);       BIO_free_all(b);       return tmp; }