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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Crypto Component */
/** */
/** Transport Layer Security (TLS) - PKCS#1 v1.5 functions */
/** */
/**************************************************************************/
/**************************************************************************/
#include "nx_crypto_pkcs1_v1.5.h"
/* DER encodings (with OIDs for common algorithms) from RFC 8017.
* NOTE: This is the equivalent DER-encoding for the value "T" described in RFC 8017 section 9.2. */
static const UCHAR _NX_CRYPTO_DER_OID_SHA_1[] = {0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03, 0x02, 0x1a, 0x05, 0x00, 0x04, 0x14};
static const UCHAR _NX_CRYPTO_DER_OID_SHA_224[] = {0x30, 0x2d, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04, 0x05, 0x00, 0x04, 0x1c};
static const UCHAR _NX_CRYPTO_DER_OID_SHA_256[] = {0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00, 0x04, 0x20};
static const UCHAR _NX_CRYPTO_DER_OID_SHA_384[] = {0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, 0x05, 0x00, 0x04, 0x30};
static const UCHAR _NX_CRYPTO_DER_OID_SHA_512[] = {0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05, 0x00, 0x04, 0x40};
static const UCHAR _NX_CRYPTO_DER_OID_SHA_512_224[] = {0x30, 0x2d, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x05, 0x05, 0x00, 0x04, 0x1c};
static const UCHAR _NX_CRYPTO_DER_OID_SHA_512_256[] = {0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x06, 0x05, 0x00, 0x04, 0x20};
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_crypto_pkcs1_v1_5_sign PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function generates an encoded signature using PKCS#1v1.5 */
/* formatting. */
/* */
/* INPUT */
/* */
/* input Data to sign */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* [nx_crypto_operation] Crypto operations */
/* */
/* CALLED BY */
/* */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
NX_CRYPTO_KEEP UINT _nx_crypto_pkcs1_v1_5_sign(UCHAR *input, UINT input_length,
UCHAR *private_key, UINT private_key_size,
UCHAR *metadata_area,
UCHAR *output, UINT output_size)
{
NX_CRYPTO_PKCS1 *ctx = (NX_CRYPTO_PKCS1 *)metadata_area;
UINT status;
/* From RFC 8017 Section 9.2, EMSA-PKCS1-v1_5-ENCODE (M, emLen):
*
* 1. Apply the hash function to the message M to produce a hash
* value H:
*
* H = Hash(M).
*
* If the hash function outputs "message too long", output
* "message too long" and stop.
*
* 2. Encode the algorithm ID for the hash function and the hash
* value into an ASN.1 value of type DigestInfo (see
* Appendix A.2.4) with the DER, where the type DigestInfo has
* the syntax
*
* DigestInfo ::= SEQUENCE {
* digestAlgorithm AlgorithmIdentifier,
* digest OCTET STRING
* }
*
* The first field identifies the hash function and the second
* contains the hash value. Let T be the DER encoding of the
* DigestInfo value (see the notes below), and let tLen be the
* length in octets of T.
*
* 3. If emLen < tLen + 11, output "intended encoded message length
* too short" and stop.
*
* 4. Generate an octet string PS consisting of emLen - tLen - 3
* octets with hexadecimal value 0xff. The length of PS will be
* at least 8 octets.
*
* 5. Concatenate PS, the DER encoding T, and other padding to form
* the encoded message EM as
*
* EM = 0x00 || 0x01 || PS || 0x00 || T.
*
*/
/* Make sure we found a supported version (essentially an assertion check). */
if (ctx -> hash_method == NX_CRYPTO_NULL
|| ctx -> public_cipher_method == NX_CRYPTO_NULL
|| (ctx -> public_cipher_method) -> nx_crypto_init == NX_CRYPTO_NULL
|| (ctx -> public_cipher_method) -> nx_crypto_operation == NX_CRYPTO_NULL)
{
return(NX_CRYPTO_PTR_ERROR);
}
if (output_size < ctx -> modulus_size)
{
return(NX_CRYPTO_NOT_SUCCESSFUL);
}
status = _nx_crypto_pkcs1_v1_5_encode(input, input_length, ctx -> hash_method, ctx -> hash_metadata, ctx -> hash_metadata_size, output, private_key_size);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
/* Initialize the crypto method with the modulus. */
status = (ctx -> public_cipher_method) -> nx_crypto_init(ctx -> public_cipher_method,
ctx -> modulus,
(NX_CRYPTO_KEY_SIZE)(ctx -> modulus_size << 3),
NX_CRYPTO_NULL,
ctx -> public_cipher_metadata,
ctx -> public_cipher_metadata_size);
if (status)
{
return(status);
}
/* Sign the hash we just generated using our local RSA private key (associated with our local cert). */
status = (ctx -> public_cipher_method) -> nx_crypto_operation(NX_CRYPTO_ENCRYPT,
NX_CRYPTO_NULL,
ctx -> public_cipher_method,
private_key,
(NX_CRYPTO_KEY_SIZE)(private_key_size << 3),
output,
(NX_CRYPTO_KEY_SIZE)(private_key_size),
NX_CRYPTO_NULL,
output,
output_size,
ctx -> public_cipher_metadata,
ctx -> public_cipher_metadata_size,
NX_CRYPTO_NULL, NX_CRYPTO_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
if ((ctx -> public_cipher_method) -> nx_crypto_cleanup)
{
status = (ctx -> public_cipher_method) -> nx_crypto_cleanup(ctx -> public_cipher_metadata);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
return(NX_CRYPTO_SUCCESS);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_crypto_pkcs1_v1_5_verify PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function verifies an encoded signature using PKCS#1v1.5 */
/* formatting. */
/* */
/* INPUT */
/* */
/* input Data to sign */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* [nx_crypto_operation] Crypto operations */
/* */
/* CALLED BY */
/* */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
NX_CRYPTO_KEEP UINT _nx_crypto_pkcs1_v1_5_verify(UCHAR *message, UINT message_length,
UCHAR *signature, UINT signature_length,
UCHAR *public_key, UINT public_key_size,
UCHAR *metadata_area)
{
UCHAR *EM1, *EM2;
NX_CRYPTO_PKCS1 *ctx = (NX_CRYPTO_PKCS1 *)metadata_area;
UINT status;
/* Make sure we found a supported version (essentially an assertion check). */
if (ctx -> hash_method == NX_CRYPTO_NULL
|| ctx -> public_cipher_method == NX_CRYPTO_NULL
|| (ctx -> public_cipher_method) -> nx_crypto_init == NX_CRYPTO_NULL
|| (ctx -> public_cipher_method) -> nx_crypto_operation == NX_CRYPTO_NULL)
{
return(NX_CRYPTO_PTR_ERROR);
}
if (sizeof(ctx -> scratch_buffer) < (2 * (ctx -> modulus_size)))
{
return(NX_CRYPTO_NOT_SUCCESSFUL);
}
/* Allocate space for encoded messages need to be compared. */
EM1 = ctx -> scratch_buffer;
EM2 = ctx -> scratch_buffer + ctx -> modulus_size;
/* Initialize the crypto method with the modulus. */
status = (ctx -> public_cipher_method) -> nx_crypto_init(ctx -> public_cipher_method,
ctx -> modulus,
(NX_CRYPTO_KEY_SIZE)(ctx -> modulus_size << 3),
NX_CRYPTO_NULL,
ctx -> public_cipher_metadata,
ctx -> public_cipher_metadata_size);
if (status)
{
return status;
}
/* Decrypt the signature by the public key to get EM1 */
status = (ctx -> public_cipher_method) -> nx_crypto_operation(NX_CRYPTO_ENCRYPT,
NX_CRYPTO_NULL,
ctx -> public_cipher_method,
public_key,
(NX_CRYPTO_KEY_SIZE)(public_key_size << 3),
signature,
signature_length,
NX_CRYPTO_NULL,
EM1,
ctx -> modulus_size,
ctx -> public_cipher_metadata,
ctx -> public_cipher_metadata_size,
NX_CRYPTO_NULL, NX_CRYPTO_NULL);
if (status)
{
return status;
}
if ((ctx -> public_cipher_method) -> nx_crypto_cleanup)
{
status = (ctx -> public_cipher_method) -> nx_crypto_cleanup(ctx -> public_cipher_metadata);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
/* Encoded the original message to get EM2. */
status = _nx_crypto_pkcs1_v1_5_encode(message, message_length, ctx -> hash_method, ctx -> hash_metadata, ctx -> hash_metadata_size, EM2, ctx -> modulus_size);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
if (NX_CRYPTO_MEMCMP(EM1, EM2, ctx -> modulus_size))
{
return(NX_CRYPTO_NOT_SUCCESSFUL);
}
return(NX_CRYPTO_SUCCESS);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_crypto_pkcs1_v1_5_encode PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function encodes a message with PKCS#1v1.5. */
/* */
/* INPUT */
/* */
/* input Data to sign */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* [nx_crypto_operation] Crypto operations */
/* */
/* CALLED BY */
/* */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), improved */
/* buffer length verification, */
/* verified memcpy use cases, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
NX_CRYPTO_KEEP UINT _nx_crypto_pkcs1_v1_5_encode(UCHAR *input, UINT input_length,
NX_CRYPTO_METHOD *hash_method,
UCHAR *metadata_area, UINT metadata_size,
UCHAR *output, UINT expected_output_length)
{
const UCHAR *der_encoding;
UINT der_encoding_length;
UINT signature_length = 0;
UINT hash_length;
UCHAR *working_ptr;
UINT status;
/* PKCS-1 Signature padding. The scheme is to start with the block type (0x00, 0x01 for signing)
then pad with 0xFF bytes (for signing) followed with a single 0 byte right before the payload,
which comes at the end of the RSA block. */
/* Start with a clear buffer. */
NX_CRYPTO_MEMSET(output, 0xff, expected_output_length);
output[0] = 0x0;
output[1] = 0x1;
/* Get the size of the hash output. */
hash_length = (hash_method -> nx_crypto_ICV_size_in_bits) >> 3;
/* Figure out which hash method we are using to get our DER-encoding. */
switch(hash_method -> nx_crypto_algorithm)
{
case NX_CRYPTO_HASH_SHA1:
der_encoding = _NX_CRYPTO_DER_OID_SHA_1;
der_encoding_length = sizeof(_NX_CRYPTO_DER_OID_SHA_1);
break;
case NX_CRYPTO_HASH_SHA224:
der_encoding = _NX_CRYPTO_DER_OID_SHA_224;
der_encoding_length = sizeof(_NX_CRYPTO_DER_OID_SHA_224);
break;
case NX_CRYPTO_HASH_SHA256:
der_encoding = _NX_CRYPTO_DER_OID_SHA_256;
der_encoding_length = sizeof(_NX_CRYPTO_DER_OID_SHA_256);
break;
case NX_CRYPTO_HASH_SHA384:
der_encoding = _NX_CRYPTO_DER_OID_SHA_384;
der_encoding_length = sizeof(_NX_CRYPTO_DER_OID_SHA_384);
break;
case NX_CRYPTO_HASH_SHA512:
der_encoding = _NX_CRYPTO_DER_OID_SHA_512;
der_encoding_length = sizeof(_NX_CRYPTO_DER_OID_SHA_512);
break;
case NX_CRYPTO_HASH_SHA512_224:
der_encoding = _NX_CRYPTO_DER_OID_SHA_512_224;
der_encoding_length = sizeof(_NX_CRYPTO_DER_OID_SHA_512_224);
break;
case NX_CRYPTO_HASH_SHA512_256:
der_encoding = _NX_CRYPTO_DER_OID_SHA_512_256;
der_encoding_length = sizeof(_NX_CRYPTO_DER_OID_SHA_512_256);
break;
default:
return(NX_CRYPTO_AUTHENTICATION_FAILED);
}
/* Encoded signature in RSA buffer (plaintext):
* signature_length = der_encoding_length + hash_length
* x = data_size - (der_encoding_length + hash_length)
* Length: | x | der_encoding_length | hash_length |
* Field: | Padding | DER encoding header | Hash value |
* Value: | 0x0,0x1,... | <ASN.1 sequence, OID> | <hash output> |
*/
/* Calculate our final signature length for later offset calculations. */
signature_length = der_encoding_length + hash_length; /* DER encoding size + hash size = plaintext encoded signature length */
if (signature_length + 1 > expected_output_length)
{
return(NX_CRYPTO_SIZE_ERROR);
}
output[expected_output_length - signature_length - 1] = 0;
/* Get a working pointer into the padded signature buffer. All PKCS-1 encoded data
comes at the end of the RSA encrypted block. */
working_ptr = &output[expected_output_length - signature_length];
/* Copy in the DER encoding. */
NX_CRYPTO_MEMCPY(working_ptr, der_encoding, der_encoding_length); /* Use case of memcpy is verified. */
/* Move the working pointer to the end of the DER encoding. */
working_ptr += der_encoding_length;
/* Generate hash of input data using supplied hash method, placing it in the output buffer at the end
* of the RSA block (data_size). */
status = hash_method -> nx_crypto_operation(NX_CRYPTO_AUTHENTICATE,
NX_CRYPTO_NULL,
hash_method,
NX_CRYPTO_NULL,
0,
input,
input_length,
NX_CRYPTO_NULL,
working_ptr,
hash_length,
metadata_area,
metadata_size,
NX_CRYPTO_NULL,
NX_CRYPTO_NULL);
return (status);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_crypto_method_pkcs1_v1_5_init PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is the common crypto method init callback for */
/* Microsoft supported PKCS#1v1.5 cryptographic algorithm. */
/* */
/* INPUT */
/* */
/* method Pointer to crypto method */
/* key Pointer to key */
/* key_size_in_bits Length of key size in bits */
/* handler Returned crypto handler */
/* crypto_metadata Metadata area */
/* crypto_metadata_size Size of the metadata area */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
NX_CRYPTO_KEEP UINT _nx_crypto_method_pkcs1_v1_5_init(struct NX_CRYPTO_METHOD_STRUCT *method,
UCHAR *key, NX_CRYPTO_KEY_SIZE key_size_in_bits,
VOID **handle,
VOID *crypto_metadata,
ULONG crypto_metadata_size)
{
NX_CRYPTO_PARAMETER_NOT_USED(key);
NX_CRYPTO_PARAMETER_NOT_USED(key_size_in_bits);
NX_CRYPTO_PARAMETER_NOT_USED(handle);
NX_CRYPTO_STATE_CHECK
if ((method == NX_CRYPTO_NULL) || (crypto_metadata == NX_CRYPTO_NULL))
{
return(NX_CRYPTO_PTR_ERROR);
}
/* Verify the metadata addrsss is 4-byte aligned. */
if((((ULONG)crypto_metadata) & 0x3) != 0)
{
return(NX_CRYPTO_PTR_ERROR);
}
if(crypto_metadata_size < sizeof(NX_CRYPTO_PKCS1))
{
return(NX_CRYPTO_PTR_ERROR);
}
return(NX_CRYPTO_SUCCESS);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_crypto_method_pkcs1_v1_5_cleanup PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function cleans up the crypto metadata. */
/* */
/* INPUT */
/* */
/* crypto_metadata Crypto metadata */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* NX_CRYPTO_MEMSET Set the memory */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
NX_CRYPTO_KEEP UINT _nx_crypto_method_pkcs1_v1_5_cleanup(VOID *crypto_metadata)
{
NX_CRYPTO_STATE_CHECK
#ifdef NX_SECURE_KEY_CLEAR
if (!crypto_metadata)
return (NX_CRYPTO_SUCCESS);
/* Clean up the crypto metadata. */
NX_CRYPTO_MEMSET(crypto_metadata, 0, sizeof(NX_CRYPTO_PKCS1));
#else
NX_CRYPTO_PARAMETER_NOT_USED(crypto_metadata);
#endif/* NX_SECURE_KEY_CLEAR */
return(NX_CRYPTO_SUCCESS);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_crypto_method_pkcs1_operation PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function performs an PKCS#1v1.5 operation. */
/* */
/* INPUT */
/* */
/* op PKCS#1v1.5 operation */
/* handle Crypto handle */
/* method Cryption Method Object */
/* key Encryption Key */
/* key_size_in_bits Key size in bits */
/* input Input data */
/* input_length_in_byte Input data size */
/* iv_ptr Initial vector */
/* output Output buffer */
/* output_length_in_byte Output buffer size */
/* crypto_metadata Metadata area */
/* crypto_metadata_size Metadata area size */
/* packet_ptr Pointer to packet */
/* nx_crypto_hw_process_callback Callback function pointer */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_crypto_pkcs1_v1_5_sign Sign using PKCS#1v1.5 */
/* _nx_crypto_pkcs1_v1_5_verify Verify PKCS#1v1.5 signature */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
NX_CRYPTO_KEEP UINT _nx_crypto_method_pkcs1_v1_5_operation(UINT op,
VOID *handle,
struct NX_CRYPTO_METHOD_STRUCT *method,
UCHAR *key, NX_CRYPTO_KEY_SIZE key_size_in_bits,
UCHAR *input, ULONG input_length_in_byte,
UCHAR *iv_ptr,
UCHAR *output, ULONG output_length_in_byte,
VOID *crypto_metadata, ULONG crypto_metadata_size,
VOID *packet_ptr,
VOID (*nx_crypto_hw_process_callback)(VOID *, UINT))
{
NX_CRYPTO_PKCS1 *ctx;
NX_CRYPTO_PKCS1_OPTIONS *options;
UINT status = NX_CRYPTO_SUCCESS;
NX_CRYPTO_PARAMETER_NOT_USED(handle);
NX_CRYPTO_PARAMETER_NOT_USED(iv_ptr);
NX_CRYPTO_PARAMETER_NOT_USED(packet_ptr);
NX_CRYPTO_PARAMETER_NOT_USED(nx_crypto_hw_process_callback);
NX_CRYPTO_STATE_CHECK
/* Verify the metadata addrsss is 4-byte aligned. */
if((method == NX_CRYPTO_NULL) || (crypto_metadata == NX_CRYPTO_NULL) || ((((ULONG)crypto_metadata) & 0x3) != 0))
{
return(NX_CRYPTO_PTR_ERROR);
}
if(crypto_metadata_size < sizeof(NX_CRYPTO_PKCS1))
{
return(NX_CRYPTO_PTR_ERROR);
}
ctx = (NX_CRYPTO_PKCS1 *)(crypto_metadata);
if (op == NX_CRYPTO_SET_ADDITIONAL_DATA)
{
options = (NX_CRYPTO_PKCS1_OPTIONS *)input;
if ((options -> public_cipher_metadata_size < (options -> public_cipher_method) -> nx_crypto_metadata_area_size)
|| (options -> hash_metadata_size < (options -> hash_method) -> nx_crypto_metadata_area_size))
{
return(NX_CRYPTO_NOT_SUCCESSFUL);
}
ctx -> public_cipher_method = options -> public_cipher_method;
ctx -> public_cipher_metadata = options -> public_cipher_metadata;
ctx -> public_cipher_metadata_size = options -> public_cipher_metadata_size;
ctx -> hash_method = options -> hash_method;
ctx -> hash_metadata = options -> hash_metadata;
ctx -> hash_metadata_size = options -> hash_metadata_size;
ctx -> modulus = key;
ctx -> modulus_size = (key_size_in_bits >> 3);
}
else if (op == NX_CRYPTO_AUTHENTICATE)
{
status = _nx_crypto_pkcs1_v1_5_sign(input,
input_length_in_byte,
key,
(key_size_in_bits >> 3),
crypto_metadata,
output,
output_length_in_byte);
}
else if (op == NX_CRYPTO_VERIFY)
{
status = _nx_crypto_pkcs1_v1_5_verify(input,
input_length_in_byte,
output,
output_length_in_byte,
key,
(key_size_in_bits >> 3),
crypto_metadata);
}
else
{
status = NX_CRYPTO_NOT_SUCCESSFUL;
}
return(status);
}