Add support for setting keybits and public exponent value for pkey RSA keygen.

crypto/bn/bn.h

@@ -447,6 +447,7 @@ char *	BN_bn2hex(const BIGNUM *a);
 char *	BN_bn2dec(const BIGNUM *a);
 int 	BN_hex2bn(BIGNUM **a, const char *str);
 int 	BN_dec2bn(BIGNUM **a, const char *str);
+int	BN_asc2bn(BIGNUM **a, const char *str);
 int	BN_gcd(BIGNUM *r,const BIGNUM *a,const BIGNUM *b,BN_CTX *ctx);
 int	BN_kronecker(const BIGNUM *a,const BIGNUM *b,BN_CTX *ctx); /* returns -2 for error */
 BIGNUM *BN_mod_inverse(BIGNUM *ret,

crypto/bn/bn_print.c

@@ -294,6 +294,27 @@ err:
 	return(0);
 	}
 
+int BN_asc2bn(BIGNUM **bn, const char *a)
+	{
+	const char *p = a;
+	if (*p == '-')
+		p++;
+
+	if (p[0] == '0' && (p[1] == 'X' || p[1] == 'x'))
+		{		
+		if (!BN_hex2bn(bn, p + 2))
+			return 0;
+		}
+	else
+		{
+		if (!BN_dec2bn(bn, p))
+			return 0;
+		}
+	if (*a == '-')
+		(*bn)->neg = 1;
+	return 1;
+	}
+
 #ifndef OPENSSL_NO_BIO
 #ifndef OPENSSL_NO_FP_API
 int BN_print_fp(FILE *fp, const BIGNUM *a)

crypto/rsa/rsa.h

@@ -203,9 +203,20 @@ struct rsa_st
 				EVP_PKEY_CTRL_RSA_PSS_SALTLEN, \
 				len, NULL)
 
+#define EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, bits) \
+	EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, EVP_PKEY_OP_KEYGEN, \
+				EVP_PKEY_CTRL_RSA_KEYGEN_BITS, bits, NULL)
+
+#define EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp) \
+	EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, EVP_PKEY_OP_KEYGEN, \
+				EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP, 0, pubexp)
+
 #define EVP_PKEY_CTRL_RSA_PADDING	(EVP_PKEY_ALG_CTRL + 1)
 #define EVP_PKEY_CTRL_RSA_PSS_SALTLEN	(EVP_PKEY_ALG_CTRL + 2)
 
+#define EVP_PKEY_CTRL_RSA_KEYGEN_BITS	(EVP_PKEY_ALG_CTRL + 3)
+#define EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP	(EVP_PKEY_ALG_CTRL + 4)
+
 #define RSA_PKCS1_PADDING	1
 #define RSA_SSLV23_PADDING	2
 #define RSA_NO_PADDING		3

crypto/rsa/rsa_pmeth.c

@@ -386,6 +386,18 @@ static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 		rctx->saltlen = p1;
 		return 1;
 
+		case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
+		if (p1 < 256)
+			return -2;
+		rctx->nbits = p1;
+		return 1;
+
+		case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
+		if (!p2)
+			return -2;
+		rctx->pub_exp = p2;
+		return 1;
+
 		case EVP_PKEY_CTRL_MD:
 		if (!check_padding_md(p2, rctx->pad_mode))
 			return 0;
@@ -422,12 +434,33 @@ static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
 			return -2;
 		return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
 		}
+
 	if (!strcmp(type, "rsa_pss_saltlen"))
 		{
 		int saltlen;
 		saltlen = atoi(value);
 		return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
 		}
+
+	if (!strcmp(type, "rsa_keygen_bits"))
+		{
+		int nbits;
+		nbits = atoi(value);
+		return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
+		}
+
+	if (!strcmp(type, "rsa_keygen_pubexp"))
+		{
+		int ret;
+		BIGNUM *pubexp = NULL;
+		if (!BN_asc2bn(&pubexp, value))
+			return 0;
+		ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
+		if (ret <= 0)
+			BN_free(pubexp);
+		return ret;
+		}
+
 	return -2;
 	}