/// <summary>
/// Calls EVP_VerifyFinal()
/// </summary>
/// <param name="md"></param>
/// <param name="bio"></param>
/// <param name="sig"></param>
/// <param name="pkey"></param>
/// <returns></returns>
public static bool Verify(MessageDigest md, BIO bio, byte[] sig, CryptoKey pkey)
{
BIO bmd = BIO.MessageDigest(md);
bmd.Push(bio);
while (true)
{
ArraySegment <byte> bytes = bmd.ReadBytes(1024 * 4);
if (bytes.Count == 0)
{
break;
}
}
MessageDigestContext ctx = new MessageDigestContext(bmd);
int ret = Native.ExpectSuccess(Native.EVP_VerifyFinal(ctx.Handle, sig, (uint)sig.Length, pkey.Handle));
return(ret == 1);
}
/// <summary>
/// Calls BIO_get_md_ctx() then BIO_get_md()
/// </summary>
/// <param name="bio"></param>
public MessageDigestContext(BIO bio)
: base(Native.ExpectNonNull(Native.BIO_get_md_ctx(bio.Handle)), false)
{
this.md = new MessageDigest(Native.ExpectNonNull(Native.BIO_get_md(bio.Handle)), false);
}
/// <summary>
/// Calls EVP_MD_CTX_create() then EVP_MD_CTX_init()
/// </summary>
/// <param name="md"></param>
public MessageDigestContext(MessageDigest md)
: base(Native.EVP_MD_CTX_create(), true)
{
Native.EVP_MD_CTX_init(this.ptr);
this.md = md;
}
/// <summary>
/// Calls HMAC_Init_ex()
/// </summary>
/// <param name="key"></param>
/// <param name="digest"></param>
public void Init(byte[] key, MessageDigest digest)
{
Native.HMAC_Init_ex(this.ptr, key, key.Length, digest.Handle, IntPtr.Zero);
this.digest_size = digest.Size;
this.initialized = true;
}