xref: /illumos-gate/usr/src/lib/pkcs11/pkcs11_tpm/common/asn1.c (revision 47e946e7)

/*
 *		Common Public License Version 0.5
 *
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 *		THIS COMMON PUBLIC LICENSE ("AGREEMENT"). ANY USE,
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 *		1. DEFINITIONS
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 *
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 *		      from a Contributor if it was added to the Program
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 * (C) COPYRIGHT International Business Machines Corp. 2001, 2002
 */
/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
#include "tpmtok_int.h"

CK_ULONG
ber_encode_INTEGER(CK_BBOOL    length_only,
	CK_BYTE  ** ber_int,
	CK_ULONG  * ber_int_len,
	CK_BYTE   * data,
	CK_ULONG    data_len)
{
	CK_BYTE   *buf = NULL;
	CK_ULONG   len;

	/*
	 * if data_len < 127 use short form length id
	 * if data_len < 256 use long form length id with
	 * byte length field
	 * if data_len < 65536 use long form length id with
	 * byte length field
	 * if data_len < 16777216 use long form length id
	 * with byte length field
	 */
	if (data_len < 128)
		len = 1 + 1 + data_len;
	else if (data_len < 256)
		len = 1 + (1 + 1) + data_len;
	else if (data_len < (1 << 16))
		len = 1 + (1 + 2) + data_len;
	else if (data_len < (1 << 24))
		len = 1 + (1 + 3) + data_len;
	else
		return (CKR_FUNCTION_FAILED);

	if (length_only == TRUE) {
		*ber_int_len = len;
		return (CKR_OK);
	}

	buf = (CK_BYTE *)malloc(len);
	if (! buf) {
		return (CKR_HOST_MEMORY);
	}
	if (data_len < 128) {
		buf[0] = 0x02;
		buf[1] = data_len;
		(void) memcpy(&buf[2], data, data_len);

		*ber_int_len = len;
		*ber_int = buf;
		return (CKR_OK);
	}

	if (data_len < 256) {
		buf[0] = 0x02;
		buf[1] = 0x81;
		buf[2] = data_len;
		(void) memcpy(&buf[3], data, data_len);

		*ber_int_len = len;
		*ber_int = buf;
		return (CKR_OK);
	}

	if (data_len < (1 << 16)) {
		buf[0] = 0x02;
		buf[1] = 0x82;
		buf[2] = (data_len >> 8) & 0xFF;
		buf[3] = (data_len) & 0xFF;
		(void) memcpy(&buf[4], data, data_len);

		*ber_int_len = len;
		*ber_int = buf;
		return (CKR_OK);
	}

	if (data_len < (1 << 24)) {
		buf[0] = 0x02;
		buf[1] = 0x83;
		buf[2] = (data_len >> 16) & 0xFF;
		buf[3] = (data_len >>  8) & 0xFF;
		buf[4] = (data_len) & 0xFF;
		(void) memcpy(&buf[5], data, data_len);

		*ber_int_len = len;
		*ber_int = buf;
		return (CKR_OK);
	}

	free(buf);
	return (CKR_FUNCTION_FAILED);
}

CK_RV
ber_decode_INTEGER(CK_BYTE   * ber_int,
	CK_BYTE  ** data,
	CK_ULONG  * data_len,
	CK_ULONG  * field_len)
{
	CK_ULONG  len, length_octets;

	if (! ber_int) {
		return (CKR_FUNCTION_FAILED);
	}
	if (ber_int[0] != 0x02) {
		return (CKR_FUNCTION_FAILED);
	}
	if ((ber_int[1] & 0x80) == 0) {
		len = ber_int[1] & 0x7F;

		*data = &ber_int[2];
		*data_len  = len;
		*field_len = 1 + 1 + len;
		return (CKR_OK);
	}

	length_octets = ber_int[1] & 0x7F;

	if (length_octets == 1) {
		len = ber_int[2];

		*data = &ber_int[3];
		*data_len  = len;
		*field_len = 1 + (1 + 1) + len;
		return (CKR_OK);
	}

	if (length_octets == 2) {
		len = ber_int[2];
		len = len << 8;
		len |= ber_int[3];

		*data = &ber_int[4];
		*data_len  = len;
		*field_len = 1 + (1 + 2) + len;
		return (CKR_OK);
	}

	if (length_octets == 3) {
		len = ber_int[2];
		len = len << 8;
		len |= ber_int[3];
		len = len << 8;
		len |= ber_int[4];

		*data = &ber_int[5];
		*data_len  = len;
		*field_len = 1 + (1 + 3) + len;
		return (CKR_OK);
	}

	return (CKR_FUNCTION_FAILED);
}

CK_RV
ber_encode_OCTET_STRING(CK_BBOOL    length_only,
CK_BYTE  ** str,
CK_ULONG  * str_len,
CK_BYTE   * data,
CK_ULONG    data_len)
{
	CK_BYTE   *buf = NULL;
	CK_ULONG   len;


	/*
	 * if data_len < 128 use shor - form length id
	 * if data_len < 256 use lon - form length id with - byte length field
	 * if data_len < 65536 use lon - form length id with - byte length field
	 */
	if (data_len < 128)
		len = 1 + 1 + data_len;
	else if (data_len < 256)
		len = 1 + (1 + 1) + data_len;
	else if (data_len < (1 << 16))
		len = 1 + (1 + 2) + data_len;
	else if (data_len < (1 << 24))
		len = 1 + (1 + 3) + data_len;
	else
		return (CKR_FUNCTION_FAILED);

	if (length_only == TRUE) {
		*str_len = len;
		return (CKR_OK);
	}

	buf = (CK_BYTE *)malloc(len);
	if (! buf) {
		return (CKR_HOST_MEMORY);
	}

	if (data_len < 128) {
		buf[0] = 0x04; /* primitive, OCTET STRING */
		buf[1] = data_len;
		(void) memcpy(&buf[2], data, data_len);

		*str_len = len;
		*str = buf;
		return (CKR_OK);
	}

	if (data_len < 256) {
		buf[0] = 0x04;	/* primitive, OCTET STRING */
		buf[1] = 0x81;	/* length header -- 1 length octets */
		buf[2] = data_len;

		(void) memcpy(&buf[3], data, data_len);

		*str_len = len;
		*str = buf;
		return (CKR_OK);
	}

	if (data_len < (1 << 16)) {
		buf[0] = 0x04;	/* primitive, OCTET STRING */
		buf[1] = 0x82;	/* length header -- 2 length octets */
		buf[2] = (data_len >> 8) & 0xFF;
		buf[3] = (data_len) & 0xFF;

		(void) memcpy(&buf[4], data, data_len);

		*str_len = len;
		*str = buf;
		return (CKR_OK);
	}

	if (data_len < (1 << 24)) {
		buf[0] = 0x04;	/* primitive, OCTET STRING */
		buf[1] = 0x83;	/* length header -- 3 length octets */
		buf[2] = (data_len >> 16) & 0xFF;
		buf[3] = (data_len >>  8) & 0xFF;
		buf[4] = (data_len) & 0xFF;

		(void) memcpy(&buf[5], data, data_len);

		*str_len = len;
		*str = buf;
		return (CKR_OK);
	}

	free(buf);
	return (CKR_FUNCTION_FAILED);
}

CK_RV
ber_decode_OCTET_STRING(CK_BYTE  * str,
	CK_BYTE ** data,
	CK_ULONG * data_len,
	CK_ULONG * field_len)
{
	CK_ULONG  len, length_octets;

	if (! str) {
		return (CKR_FUNCTION_FAILED);
	}
	if (str[0] != 0x04) {
		return (CKR_FUNCTION_FAILED);
	}
	if ((str[1] & 0x80) == 0) {
		len = str[1] & 0x7F;

		*data = &str[2];
		*data_len  = len;
		*field_len = 1 + (1) + len;
		return (CKR_OK);
	}

	length_octets = str[1] & 0x7F;

	if (length_octets == 1) {
		len = str[2];

		*data = &str[3];
		*data_len  = len;
		*field_len = 1 + (1 + 1) + len;
		return (CKR_OK);
	}

	if (length_octets == 2) {
		len = str[2];
		len = len << 8;
		len |= str[3];

		*data = &str[4];
		*data_len  = len;
		*field_len = 1 + (1 + 2) + len;
		return (CKR_OK);
	}

	if (length_octets == 3) {
		len = str[2];
		len = len << 8;
		len |= str[3];
		len = len << 8;
		len |= str[4];

		*data = &str[5];
		*data_len  = len;
		*field_len = 1 + (1 + 3) + len;
		return (CKR_OK);
	}

	/* > 3 length octets implies a length > 16MB */
	return (CKR_FUNCTION_FAILED);
}

CK_RV
ber_encode_SEQUENCE(CK_BBOOL    length_only,
	CK_BYTE  ** seq,
	CK_ULONG  * seq_len,
	CK_BYTE   * data,
	CK_ULONG    data_len)
{
	CK_BYTE   *buf = NULL;
	CK_ULONG   len;

	if (data_len < 128)
		len = 1 + 1 + data_len;
	else if (data_len < 256)
		len = 1 + (1 + 1) + data_len;
	else if (data_len < (1 << 16))
		len = 1 + (1 + 2) + data_len;
	else if (data_len < (1 << 24))
		len = 1 + (1 + 3) + data_len;
	else
		return (CKR_FUNCTION_FAILED);

	if (length_only == TRUE) {
		*seq_len = len;
		return (CKR_OK);
	}

	buf = (CK_BYTE *)malloc(len);
	if (! buf) {
		return (CKR_HOST_MEMORY);
	}

	if (data_len < 128) {
		buf[0] = 0x30;	/* constructed, SEQUENCE */
		buf[1] = data_len;
		(void) memcpy(&buf[2], data, data_len);

		*seq_len = len;
		*seq = buf;
		return (CKR_OK);
	}

	if (data_len < 256) {
		buf[0] = 0x30;	/* constructed, SEQUENCE */
		buf[1] = 0x81;	/* length header -- 1 length octets */
		buf[2] = data_len;

		(void) memcpy(&buf[3], data, data_len);

		*seq_len = len;
		*seq = buf;
		return (CKR_OK);
	}

	if (data_len < (1 << 16)) {
		buf[0] = 0x30;	/* constructed, SEQUENCE */
		buf[1] = 0x82;	/* length header -- 2 length octets */
		buf[2] = (data_len >> 8) & 0xFF;
		buf[3] = (data_len) & 0xFF;

		(void) memcpy(&buf[4], data, data_len);

		*seq_len = len;
		*seq = buf;
		return (CKR_OK);
	}

	if (data_len < (1 << 24)) {
		buf[0] = 0x30;	/* constructed, SEQUENCE */
		buf[1] = 0x83;	/* length header -- 3 length octets */
		buf[2] = (data_len >> 16) & 0xFF;
		buf[3] = (data_len >>  8) & 0xFF;
		buf[4] = (data_len) & 0xFF;

		(void) memcpy(&buf[5], data, data_len);

		*seq_len = len;
		*seq = buf;
		return (CKR_OK);
	}

	return (CKR_FUNCTION_FAILED);
}

CK_RV
ber_decode_SEQUENCE(CK_BYTE  * seq,
	CK_BYTE ** data,
	CK_ULONG * data_len,
	CK_ULONG * field_len)
{
	CK_ULONG  len, length_octets;

	if (! seq) {
		return (CKR_FUNCTION_FAILED);
	}
	if (seq[0] != 0x30) {
		return (CKR_FUNCTION_FAILED);
	}
	if ((seq[1] & 0x80) == 0) {
		len = seq[1] & 0x7F;

		*data = &seq[2];
		*data_len  = len;
		*field_len = 1 + (1) + len;
		return (CKR_OK);
	}

	length_octets = seq[1] & 0x7F;

	if (length_octets == 1) {
		len = seq[2];

		*data = &seq[3];
		*data_len  = len;
		*field_len = 1 + (1 + 1) + len;
		return (CKR_OK);
	}

	if (length_octets == 2) {
		len = seq[2];
		len = len << 8;
		len |= seq[3];

		*data = &seq[4];
		*data_len  = len;
		*field_len = 1 + (1 + 2) + len;
		return (CKR_OK);
	}

	if (length_octets == 3) {
		len = seq[2];
		len = len << 8;
		len |= seq[3];
		len = len << 8;
		len |= seq[4];

		*data = &seq[5];
		*data_len  = len;
		*field_len = 1 + (1 + 3) + len;
		return (CKR_OK);
	}

	return (CKR_FUNCTION_FAILED);
}

/*
 *
 * PrivateKeyInfo ::= SEQUENCE {
 *    version  Version  -- always '0' for now
 *    privateKeyAlgorithm PrivateKeyAlgorithmIdentifier
 *    privateKey  PrivateKey
 *    attributes
 * }
 */
CK_RV
ber_encode_PrivateKeyInfo(CK_BBOOL    length_only,
CK_BYTE  ** data,
CK_ULONG  * data_len,
CK_BYTE   * algorithm_id,
CK_ULONG    algorithm_id_len,
CK_BYTE   * priv_key,
CK_ULONG    priv_key_len)
{
	CK_BYTE  * buf = NULL;
	CK_BYTE  * tmp = NULL;
	CK_BYTE    version[] = { 0 };
	CK_BYTE    attrib[]  = { 0x05, 0x00 };
	CK_ULONG   len, total;
	CK_RV rc;

	len = 0;

	rc = ber_encode_INTEGER(TRUE, NULL, &total, version, sizeof (version));
	if (rc != CKR_OK) {
		return (rc);
	}
	else
	len += total;

	len += algorithm_id_len;

	rc = ber_encode_OCTET_STRING(TRUE, NULL, &total,
	    priv_key, priv_key_len);

	if (rc != CKR_OK)
		return (rc);

	len += total;

	/* for this stuff, attributes are always NULL == 05 00 */
	len += sizeof (attrib);

	if (length_only == TRUE) {
		rc = ber_encode_SEQUENCE(TRUE, NULL, &total, NULL, len);

		if (rc == CKR_OK)
			*data_len = total;
		return (rc);
	}

	buf = (CK_BYTE *)malloc(len);
	if (! buf) {
		return (CKR_HOST_MEMORY);
	}
	len = 0;
	rc = ber_encode_INTEGER(FALSE, &tmp, &total, version, sizeof (version));
	if (rc != CKR_OK) {
		goto error;
	}
	(void) memcpy(buf + len, tmp, total);
	len += total;
	free(tmp);

	(void) memcpy(buf + len, algorithm_id, algorithm_id_len);
	len += algorithm_id_len;

	rc = ber_encode_OCTET_STRING(FALSE, &tmp, &total,
	    priv_key, priv_key_len);
	if (rc != CKR_OK) {
		goto error;
	}
	(void) memcpy(buf + len, tmp, total);
	len += total;
	free(tmp);

	(void) memcpy(buf + len, attrib, sizeof (attrib));
	len += sizeof (attrib);

	rc = ber_encode_SEQUENCE(FALSE, data, data_len, buf, len);

error:
	free(buf);
	return (rc);
}

CK_RV
ber_decode_PrivateKeyInfo(CK_BYTE   * data,
	CK_ULONG    data_len,
	CK_BYTE  ** algorithm,
	CK_ULONG  * alg_len,
	CK_BYTE  ** priv_key)
{
	CK_BYTE  *buf = NULL;
	CK_BYTE  *alg = NULL;
	CK_BYTE  *ver = NULL;
	CK_ULONG  buf_len, offset, len, field_len;
	CK_RV rc;

	if (! data || (data_len == 0)) {
		return (CKR_FUNCTION_FAILED);
	}
	rc = ber_decode_SEQUENCE(data, &buf, &buf_len, &field_len);
	if (rc != CKR_OK) {
		return (rc);
	}
	offset = 0;
	rc = ber_decode_INTEGER(buf + offset, &ver, &len, &field_len);
	if (rc != CKR_OK) {
		return (rc);
	}
	offset += field_len;

	rc = ber_decode_SEQUENCE(buf + offset, &alg, &len, &field_len);
	if (rc != CKR_OK) {
		return (rc);
	}
	*algorithm = alg;
	*alg_len   = len;

	rc = ber_decode_OCTET_STRING(alg + len, priv_key, &buf_len, &field_len);
	return (rc);
}

/*
 * RSAPrivateKey ::= SEQUENCE {
 *    version  Version  -- always '0' for now
 *    modulus  INTEGER
 *    publicExponent  INTEGER
 *    privateExponent INTEGER
 *    prime1  INTEGER
 *    prime2  INTEGER
 *    exponent1  INTEGER
 *    exponent2  INTEGER
 *    coefficient INTEGER
 * }
 */
CK_RV
ber_encode_RSAPrivateKey(CK_BBOOL    length_only,
	CK_BYTE  ** data,
	CK_ULONG  * data_len,
	CK_ATTRIBUTE * modulus,
	CK_ATTRIBUTE * publ_exp,
	CK_ATTRIBUTE * priv_exp,
	CK_ATTRIBUTE * prime1,
	CK_ATTRIBUTE * prime2,
	CK_ATTRIBUTE * exponent1,
	CK_ATTRIBUTE * exponent2,
	CK_ATTRIBUTE * coeff)
{
	CK_BYTE   *buf = NULL;
	CK_BYTE   *buf2 = NULL;
	CK_ULONG   len, offset;
	CK_BYTE    version[] = { 0 };
	CK_RV rc;

	offset = 0;
	rc = 0;

	rc |= ber_encode_INTEGER(TRUE, NULL, &len, NULL,
	    sizeof (version));
	offset += len;
	rc |= ber_encode_INTEGER(TRUE, NULL, &len, NULL,
	    modulus->ulValueLen);
	offset += len;
	rc |= ber_encode_INTEGER(TRUE, NULL, &len, NULL,
	    publ_exp->ulValueLen);
	offset += len;
	rc |= ber_encode_INTEGER(TRUE, NULL, &len, NULL,
	    priv_exp->ulValueLen);
	offset += len;
	rc |= ber_encode_INTEGER(TRUE, NULL, &len, NULL,
	    prime1->ulValueLen);
	offset += len;
	rc |= ber_encode_INTEGER(TRUE, NULL, &len, NULL,
	    prime2->ulValueLen);
	offset += len;
	rc |= ber_encode_INTEGER(TRUE, NULL, &len, NULL,
	    exponent1->ulValueLen);
	offset += len;
	rc |= ber_encode_INTEGER(TRUE, NULL, &len, NULL,
	    exponent2->ulValueLen);
	offset += len;
	rc |= ber_encode_INTEGER(TRUE, NULL, &len, NULL,
	    coeff->ulValueLen);
	offset += len;

	if (rc != CKR_OK) {
		return (CKR_FUNCTION_FAILED);
	}
	if (length_only == TRUE) {
		rc = ber_encode_SEQUENCE(TRUE, NULL, &len, NULL, offset);
		if (rc != CKR_OK)
			return (rc);
		rc = ber_encode_PrivateKeyInfo(TRUE,
		    NULL, data_len,
		    NULL, ber_AlgIdRSAEncryptionLen,
		    NULL, len);
		if (rc != CKR_OK)
			return (rc);
		return (rc);
	}

	buf = (CK_BYTE *)malloc(offset);
	if (! buf) {
		return (CKR_HOST_MEMORY);
	}
	offset = 0;
	rc = 0;

	rc = ber_encode_INTEGER(FALSE, &buf2, &len, version, sizeof (version));
	if (rc != CKR_OK) {
		goto error;
	}
	(void) memcpy(buf + offset, buf2, len);
	offset += len;
	free(buf2);

	rc = ber_encode_INTEGER(FALSE, &buf2, &len,
	    (CK_BYTE *)modulus + sizeof (CK_ATTRIBUTE), modulus->ulValueLen);
	if (rc != CKR_OK) {
		goto error;
	}
	(void) memcpy(buf + offset, buf2, len);
	offset += len;
	free(buf2);

	rc = ber_encode_INTEGER(FALSE, &buf2, &len,
	    (CK_BYTE *)publ_exp + sizeof (CK_ATTRIBUTE), publ_exp->ulValueLen);
	if (rc != CKR_OK) {
		goto error;
	}
	(void) memcpy(buf + offset, buf2, len);
	offset += len;
	free(buf2);

	rc = ber_encode_INTEGER(FALSE, &buf2, &len,
	    (CK_BYTE *)priv_exp  + sizeof (CK_ATTRIBUTE),
	    priv_exp->ulValueLen);
	if (rc != CKR_OK) {
		goto error;
	}
	(void) memcpy(buf + offset, buf2, len);
	offset += len;
	free(buf2);

	rc = ber_encode_INTEGER(FALSE, &buf2, &len,
	    (CK_BYTE *)prime1 + sizeof (CK_ATTRIBUTE), prime1->ulValueLen);
	if (rc != CKR_OK) {
		goto error;
	}
	(void) memcpy(buf + offset, buf2, len);
	offset += len;
	free(buf2);

	rc = ber_encode_INTEGER(FALSE, &buf2, &len,
	    (CK_BYTE *)prime2 + sizeof (CK_ATTRIBUTE), prime2->ulValueLen);
	if (rc != CKR_OK) {
		goto error;
	}
	(void) memcpy(buf + offset, buf2, len);
	offset += len;
	free(buf2);

	rc = ber_encode_INTEGER(FALSE, &buf2, &len,
	    (CK_BYTE *)exponent1 + sizeof (CK_ATTRIBUTE),
	    exponent1->ulValueLen);
	if (rc != CKR_OK) {
		goto error;
	}
	(void) memcpy(buf + offset, buf2, len);
	offset += len;
	free(buf2);

	rc = ber_encode_INTEGER(FALSE, &buf2, &len,
	    (CK_BYTE *)exponent2 + sizeof (CK_ATTRIBUTE),
	    exponent2->ulValueLen);
	if (rc != CKR_OK) {
		goto error;
	}
	(void) memcpy(buf + offset, buf2, len);
	offset += len;
	free(buf2);

	rc = ber_encode_INTEGER(FALSE, &buf2, &len,
	    (CK_BYTE *)coeff + sizeof (CK_ATTRIBUTE), coeff->ulValueLen);
	if (rc != CKR_OK) {
		goto error;
	}
	(void) memcpy(buf + offset, buf2, len);
	offset += len;
	free(buf2);

	rc = ber_encode_SEQUENCE(FALSE, &buf2, &len, buf, offset);
	if (rc != CKR_OK) {
		goto error;
	}
	rc = ber_encode_PrivateKeyInfo(FALSE,
	    data, data_len,
	    ber_AlgIdRSAEncryption, ber_AlgIdRSAEncryptionLen,
	    buf2, len);
error:
	if (buf2) free(buf2);
	if (buf)  free(buf);
	return (rc);
}

CK_RV
ber_decode_RSAPrivateKey(CK_BYTE    * data,
	CK_ULONG data_len,
	CK_ATTRIBUTE ** modulus,
	CK_ATTRIBUTE ** publ_exp,
	CK_ATTRIBUTE ** priv_exp,
	CK_ATTRIBUTE ** prime1,
	CK_ATTRIBUTE ** prime2,
	CK_ATTRIBUTE ** exponent1,
	CK_ATTRIBUTE ** exponent2,
	CK_ATTRIBUTE ** coeff)
{
	CK_ATTRIBUTE *n_attr = NULL;
	CK_ATTRIBUTE *e_attr = NULL;
	CK_ATTRIBUTE *d_attr = NULL;
	CK_ATTRIBUTE *p_attr = NULL;
	CK_ATTRIBUTE *q_attr = NULL;
	CK_ATTRIBUTE *e1_attr = NULL;
	CK_ATTRIBUTE *e2_attr = NULL;
	CK_ATTRIBUTE *coeff_attr = NULL;

	CK_BYTE  *alg = NULL;
	CK_BYTE  *rsa_priv_key = NULL;
	CK_BYTE  *buf = NULL;
	CK_BYTE  *tmp = NULL;
	CK_ULONG offset, buf_len, field_len, len;
	CK_RV rc;

	rc = ber_decode_PrivateKeyInfo(data, data_len, &alg,
	    &len, &rsa_priv_key);
	if (rc != CKR_OK) {
		return (rc);
	}
	if (memcmp(alg, ber_rsaEncryption, ber_rsaEncryptionLen) != 0) {
		return (CKR_FUNCTION_FAILED);
	}
	rc = ber_decode_SEQUENCE(rsa_priv_key, &buf, &buf_len, &field_len);
	if (rc != CKR_OK)
		return (rc);
	offset = 0;

	rc = ber_decode_INTEGER(buf + offset, &tmp, &len, &field_len);
	if (rc != CKR_OK) {
		goto cleanup;
	}
	offset += field_len;

	rc = ber_decode_INTEGER(buf + offset, &tmp, &len, &field_len);
	if (rc != CKR_OK) {
		goto cleanup;
	}
	offset += field_len;

	rc = ber_decode_INTEGER(buf + offset, &tmp, &len, &field_len);
	if (rc != CKR_OK) {
		goto cleanup;
	}
	offset += field_len;

	rc = ber_decode_INTEGER(buf + offset, &tmp, &len, &field_len);
	if (rc != CKR_OK) {
		goto cleanup;
	}
	offset += field_len;

	rc = ber_decode_INTEGER(buf + offset, &tmp, &len, &field_len);
	if (rc != CKR_OK) {
		goto cleanup;
	}
	offset += field_len;

	rc = ber_decode_INTEGER(buf + offset, &tmp, &len, &field_len);
	if (rc != CKR_OK) {
		goto cleanup;
	}
	offset += field_len;

	rc = ber_decode_INTEGER(buf + offset, &tmp, &len, &field_len);
	if (rc != CKR_OK) {
		goto cleanup;
	}
	offset += field_len;

	rc = ber_decode_INTEGER(buf + offset, &tmp, &len, &field_len);
	if (rc != CKR_OK) {
		goto cleanup;
	}
	offset += field_len;

	rc = ber_decode_INTEGER(buf + offset, &tmp, &len, &field_len);
	if (rc != CKR_OK) {
		goto cleanup;
	}
	offset += field_len;

	if (offset > buf_len) {
		return (CKR_FUNCTION_FAILED);
	}

	offset = 0;

	rc = ber_decode_INTEGER(buf + offset, &tmp, &len, &field_len);
	if (rc != CKR_OK) {
		goto cleanup;
	}
	offset += field_len;

	rc = ber_decode_INTEGER(buf + offset, &tmp, &len, &field_len);
	if (rc != CKR_OK) {
		goto cleanup;
	} else {
		rc = build_attribute(CKA_MODULUS, tmp, len, &n_attr);
		if (rc != CKR_OK) {
			goto cleanup;
		}
		offset += field_len;
	}

	rc = ber_decode_INTEGER(buf + offset, &tmp, &len, &field_len);
	if (rc != CKR_OK) {
		goto cleanup;
	} else {
		rc = build_attribute(CKA_PUBLIC_EXPONENT, tmp, len, &e_attr);
		if (rc != CKR_OK) {
			goto cleanup;
		}
		offset += field_len;
	}

	rc = ber_decode_INTEGER(buf + offset, &tmp, &len, &field_len);
	if (rc != CKR_OK) {
		goto cleanup;
	} else {
		rc = build_attribute(CKA_PRIVATE_EXPONENT, tmp, len, &d_attr);
		if (rc != CKR_OK) {
			goto cleanup;
		}
		offset += field_len;
	}

	rc = ber_decode_INTEGER(buf + offset, &tmp, &len, &field_len);
	if (rc != CKR_OK) {
		goto cleanup;
	} else {
		rc = build_attribute(CKA_PRIME_1, tmp, len, &p_attr);
		if (rc != CKR_OK) {
			goto cleanup;
		}
		offset += field_len;
	}

	rc = ber_decode_INTEGER(buf + offset, &tmp, &len, &field_len);
	if (rc != CKR_OK) {
		goto cleanup;
	} else {
		rc = build_attribute(CKA_PRIME_2, tmp, len, &q_attr);
		if (rc != CKR_OK) {
			goto cleanup;
		}
		offset += field_len;
	}

	rc = ber_decode_INTEGER(buf + offset, &tmp, &len, &field_len);
	if (rc != CKR_OK) {
		goto cleanup;
	} else {
		rc = build_attribute(CKA_EXPONENT_1, tmp, len, &e1_attr);
		if (rc != CKR_OK) {
			goto cleanup;
		}
		offset += field_len;
	}

	rc = ber_decode_INTEGER(buf + offset, &tmp, &len, &field_len);
	if (rc != CKR_OK) {
		goto cleanup;
	} else {
		rc = build_attribute(CKA_EXPONENT_2, tmp, len, &e2_attr);
		if (rc != CKR_OK) {
			goto cleanup;
		}
		offset += field_len;
	}

	rc = ber_decode_INTEGER(buf + offset, &tmp, &len, &field_len);
	if (rc != CKR_OK) {
		goto cleanup;
	} else {
		rc = build_attribute(CKA_COEFFICIENT, tmp, len, &coeff_attr);
		if (rc != CKR_OK) {
			goto cleanup;
		}
		offset += len;
	}

	*modulus   = n_attr;
	*publ_exp  = e_attr;
	*priv_exp  = d_attr;
	*prime1 = p_attr;
	*prime2 = q_attr;
	*exponent1 = e1_attr;
	*exponent2 = e2_attr;
	*coeff = coeff_attr;

	return (CKR_OK);

cleanup:
	if (n_attr) free(n_attr);
	if (e_attr) free(e_attr);
	if (d_attr) free(d_attr);
	if (p_attr) free(p_attr);
	if (q_attr) free(q_attr);
	if (e1_attr) free(e1_attr);
	if (e2_attr) free(e2_attr);
	if (coeff_attr) free(coeff_attr);

	return (rc);
}