SHA256_Begin       53 crypto/hmac_win.cc     SHA256_Begin(&ctx);
SHA256_Begin       71 crypto/hmac_win.cc   SHA256_Begin(&ctx);
SHA256_Begin       81 crypto/hmac_win.cc   SHA256_Begin(&ctx);
SHA256_Begin       23 crypto/secure_hash_default.cc     SHA256_Begin(&ctx_);
SHA256_Begin       51 crypto/third_party/nss/chromium-blapi.h extern void SHA256_Begin(SHA256Context *cx);
SHA256_Begin      483 crypto/third_party/nss/sha512.cc     SHA256_Begin(&ctx);