From 3e4585c8fd0b23f884d775462736502599146af6 Mon Sep 17 00:00:00 2001
From: "Dr. Stephen Henson" <steve@openssl.org>
Date: Tue, 28 Mar 2006 14:35:32 +0000
Subject: New utility pkeyparam. Enhance and bugfix algorithm specific
 parameter functions to support it.

---
 crypto/dh/dh_ameth.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 80 insertions(+), 1 deletion(-)

(limited to 'crypto/dh/dh_ameth.c')

diff --git a/crypto/dh/dh_ameth.c b/crypto/dh/dh_ameth.c
index bcc56a166e..ba3ff562a1 100644
--- a/crypto/dh/dh_ameth.c
+++ b/crypto/dh/dh_ameth.c
@@ -67,6 +67,82 @@ static void int_dh_free(EVP_PKEY *pkey)
 	DH_free(pkey->pkey.dh);
 	}
 
+static int dh_param_decode(EVP_PKEY *pkey,
+					const unsigned char **pder, int derlen)
+	{
+	DH *dh;
+	if (!(dh = d2i_DHparams(NULL, pder, derlen)))
+		{
+		DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB);
+		return 0;
+		}
+	EVP_PKEY_assign_DH(pkey, dh);
+	return 1;
+	}
+
+static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
+	{
+	return i2d_DHparams(pkey->pkey.dh, pder);
+	}
+
+static int do_dhparam_print(BIO *bp, const DH *x, int indent,
+							ASN1_PCTX *ctx)
+	{
+	unsigned char *m=NULL;
+	int reason=ERR_R_BUF_LIB,ret=0;
+	size_t buf_len=0, i;
+
+	if (x->p)
+		buf_len = (size_t)BN_num_bytes(x->p);
+	else
+		{
+		reason = ERR_R_PASSED_NULL_PARAMETER;
+		goto err;
+		}
+	if (x->g)
+		if (buf_len < (i = (size_t)BN_num_bytes(x->g)))
+			buf_len = i;
+	m=(unsigned char *)OPENSSL_malloc(buf_len+10);
+	if (m == NULL)
+		{
+		reason=ERR_R_MALLOC_FAILURE;
+		goto err;
+		}
+
+	BIO_indent(bp, indent, 128);
+	if (BIO_printf(bp,"Diffie-Hellman-Parameters: (%d bit)\n",
+		BN_num_bits(x->p)) <= 0)
+		goto err;
+	indent += 4;
+	if (!ASN1_bn_print(bp,"prime:",x->p,m,indent)) goto err;
+	if (!ASN1_bn_print(bp,"generator:",x->g,m,indent)) goto err;
+	if (x->length != 0)
+		{
+		BIO_indent(bp, indent, 128);
+		if (BIO_printf(bp,"recommended-private-length: %d bits\n",
+			(int)x->length) <= 0) goto err;
+		}
+	ret=1;
+	if (0)
+		{
+err:
+		DHerr(DH_F_DHPARAMS_PRINT,reason);
+		}
+	if (m != NULL) OPENSSL_free(m);
+	return(ret);
+	}
+
+static int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
+							ASN1_PCTX *ctx)
+	{
+	return do_dhparam_print(bp, pkey->pkey.dh, indent, ctx);
+	}
+
+int DHparams_print(BIO *bp, const DH *x)
+	{
+	return do_dhparam_print(bp, x, 4, NULL);
+	}
+
 const EVP_PKEY_ASN1_METHOD dh_asn1_meth = 
 	{
 	EVP_PKEY_DH,
@@ -88,7 +164,10 @@ const EVP_PKEY_ASN1_METHOD dh_asn1_meth =
 	0,
 	0,
 
-	0,0,0,0,0,0,
+	dh_param_decode,
+	dh_param_encode,
+	0,0,0,
+	dh_param_print,
 
 	int_dh_free,
 	0
-- 
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