MCUXpresso SDK API Reference Manual  Rev. 0
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LTC PKHA driver

Overview

This section describes the programming interface of the LTC PKHA driver.

Data Structures

struct  ltc_pkha_ecc_point_t
 PKHA ECC point structure. More...
 

Enumerations

enum  ltc_pkha_timing_t {
  kLTC_PKHA_NoTimingEqualized = 0U,
  kLTC_PKHA_TimingEqualized = 1U
}
 Use of timing equalized version of a PKHA function. More...
 
enum  ltc_pkha_f2m_t {
  kLTC_PKHA_IntegerArith = 0U,
  kLTC_PKHA_F2mArith = 1U
}
 Integer vs binary polynomial arithmetic selection. More...
 
enum  ltc_pkha_montgomery_form_t {
  kLTC_PKHA_NormalValue = 0U,
  kLTC_PKHA_MontgomeryFormat = 1U
}
 Montgomery or normal PKHA input format. More...
 

Functions

int LTC_PKHA_CompareBigNum (const uint8_t *a, size_t sizeA, const uint8_t *b, size_t sizeB)
 Compare two PKHA big numbers. More...
 
status_t LTC_PKHA_NormalToMontgomery (LTC_Type *base, const uint8_t *N, uint16_t sizeN, uint8_t *A, uint16_t *sizeA, uint8_t *B, uint16_t *sizeB, uint8_t *R2, uint16_t *sizeR2, ltc_pkha_timing_t equalTime, ltc_pkha_f2m_t arithType)
 Converts from integer to Montgomery format. More...
 
status_t LTC_PKHA_MontgomeryToNormal (LTC_Type *base, const uint8_t *N, uint16_t sizeN, uint8_t *A, uint16_t *sizeA, uint8_t *B, uint16_t *sizeB, ltc_pkha_timing_t equalTime, ltc_pkha_f2m_t arithType)
 Converts from Montgomery format to int. More...
 
status_t LTC_PKHA_ModAdd (LTC_Type *base, const uint8_t *A, uint16_t sizeA, const uint8_t *B, uint16_t sizeB, const uint8_t *N, uint16_t sizeN, uint8_t *result, uint16_t *resultSize, ltc_pkha_f2m_t arithType)
 Performs modular addition - (A + B) mod N. More...
 
status_t LTC_PKHA_ModSub1 (LTC_Type *base, const uint8_t *A, uint16_t sizeA, const uint8_t *B, uint16_t sizeB, const uint8_t *N, uint16_t sizeN, uint8_t *result, uint16_t *resultSize)
 Performs modular subtraction - (A - B) mod N. More...
 
status_t LTC_PKHA_ModSub2 (LTC_Type *base, const uint8_t *A, uint16_t sizeA, const uint8_t *B, uint16_t sizeB, const uint8_t *N, uint16_t sizeN, uint8_t *result, uint16_t *resultSize)
 Performs modular subtraction - (B - A) mod N. More...
 
status_t LTC_PKHA_ModMul (LTC_Type *base, const uint8_t *A, uint16_t sizeA, const uint8_t *B, uint16_t sizeB, const uint8_t *N, uint16_t sizeN, uint8_t *result, uint16_t *resultSize, ltc_pkha_f2m_t arithType, ltc_pkha_montgomery_form_t montIn, ltc_pkha_montgomery_form_t montOut, ltc_pkha_timing_t equalTime)
 Performs modular multiplication - (A x B) mod N. More...
 
status_t LTC_PKHA_ModExp (LTC_Type *base, const uint8_t *A, uint16_t sizeA, const uint8_t *N, uint16_t sizeN, const uint8_t *E, uint16_t sizeE, uint8_t *result, uint16_t *resultSize, ltc_pkha_f2m_t arithType, ltc_pkha_montgomery_form_t montIn, ltc_pkha_timing_t equalTime)
 Performs modular exponentiation - (A^E) mod N. More...
 
status_t LTC_PKHA_ModRed (LTC_Type *base, const uint8_t *A, uint16_t sizeA, const uint8_t *N, uint16_t sizeN, uint8_t *result, uint16_t *resultSize, ltc_pkha_f2m_t arithType)
 Performs modular reduction - (A) mod N. More...
 
status_t LTC_PKHA_ModInv (LTC_Type *base, const uint8_t *A, uint16_t sizeA, const uint8_t *N, uint16_t sizeN, uint8_t *result, uint16_t *resultSize, ltc_pkha_f2m_t arithType)
 Performs modular inversion - (A^-1) mod N. More...
 
status_t LTC_PKHA_ModR2 (LTC_Type *base, const uint8_t *N, uint16_t sizeN, uint8_t *result, uint16_t *resultSize, ltc_pkha_f2m_t arithType)
 Computes integer Montgomery factor R^2 mod N. More...
 
status_t LTC_PKHA_GCD (LTC_Type *base, const uint8_t *A, uint16_t sizeA, const uint8_t *N, uint16_t sizeN, uint8_t *result, uint16_t *resultSize, ltc_pkha_f2m_t arithType)
 Calculates the greatest common divisor - GCD (A, N). More...
 
status_t LTC_PKHA_PrimalityTest (LTC_Type *base, const uint8_t *A, uint16_t sizeA, const uint8_t *B, uint16_t sizeB, const uint8_t *N, uint16_t sizeN, bool *res)
 Executes Miller-Rabin primality test. More...
 
status_t LTC_PKHA_ECC_PointAdd (LTC_Type *base, const ltc_pkha_ecc_point_t *A, const ltc_pkha_ecc_point_t *B, const uint8_t *N, const uint8_t *R2modN, const uint8_t *aCurveParam, const uint8_t *bCurveParam, uint8_t size, ltc_pkha_f2m_t arithType, ltc_pkha_ecc_point_t *result)
 Adds elliptic curve points - A + B. More...
 
status_t LTC_PKHA_ECC_PointDouble (LTC_Type *base, const ltc_pkha_ecc_point_t *B, const uint8_t *N, const uint8_t *aCurveParam, const uint8_t *bCurveParam, uint8_t size, ltc_pkha_f2m_t arithType, ltc_pkha_ecc_point_t *result)
 Doubles elliptic curve points - B + B. More...
 
status_t LTC_PKHA_ECC_PointMul (LTC_Type *base, const ltc_pkha_ecc_point_t *A, const uint8_t *E, uint8_t sizeE, const uint8_t *N, const uint8_t *R2modN, const uint8_t *aCurveParam, const uint8_t *bCurveParam, uint8_t size, ltc_pkha_timing_t equalTime, ltc_pkha_f2m_t arithType, ltc_pkha_ecc_point_t *result, bool *infinity)
 Multiplies an elliptic curve point by a scalar - E x (A0, A1). More...
 

Data Structure Documentation

struct ltc_pkha_ecc_point_t

Data Fields

uint8_t * X
 X coordinate (affine)
 
uint8_t * Y
 Y coordinate (affine)
 

Enumeration Type Documentation

Enumerator
kLTC_PKHA_NoTimingEqualized 

Normal version of a PKHA operation.

kLTC_PKHA_TimingEqualized 

Timing-equalized version of a PKHA operation.

Enumerator
kLTC_PKHA_IntegerArith 

Use integer arithmetic.

kLTC_PKHA_F2mArith 

Use binary polynomial arithmetic.

Enumerator
kLTC_PKHA_NormalValue 

PKHA number is normal integer.

kLTC_PKHA_MontgomeryFormat 

PKHA number is in montgomery format.

Function Documentation

int LTC_PKHA_CompareBigNum ( const uint8_t *  a,
size_t  sizeA,
const uint8_t *  b,
size_t  sizeB 
)

Compare two PKHA big numbers. Return 1 for a > b, -1 for a < b and 0 if they are same. PKHA big number is lsbyte first. Thus the comparison starts at msbyte which is the last member of tested arrays.

Parameters
aFirst integer represented as an array of bytes, lsbyte first.
sizeASize in bytes of the first integer.
bSecond integer represented as an array of bytes, lsbyte first.
sizeBSize in bytes of the second integer.
Returns
1 if a > b.
-1 if a < b.
0 if a = b.
status_t LTC_PKHA_NormalToMontgomery ( LTC_Type *  base,
const uint8_t *  N,
uint16_t  sizeN,
uint8_t *  A,
uint16_t *  sizeA,
uint8_t *  B,
uint16_t *  sizeB,
uint8_t *  R2,
uint16_t *  sizeR2,
ltc_pkha_timing_t  equalTime,
ltc_pkha_f2m_t  arithType 
)

This function computes R2 mod N and optionally converts A or B into Montgomery format of A or B.

Parameters
baseLTC peripheral base address
Nmodulus
sizeNsize of N in bytes
[in,out]AThe first input in non-Montgomery format. Output Montgomery format of the first input.
[in,out]sizeApointer to size variable. On input it holds size of input A in bytes. On output it holds size of Montgomery format of A in bytes.
[in,out]BSecond input in non-Montgomery format. Output Montgomery format of the second input.
[in,out]sizeBpointer to size variable. On input it holds size of input B in bytes. On output it holds size of Montgomery format of B in bytes.
[out]R2Output Montgomery factor R2 mod N.
[out]sizeR2pointer to size variable. On output it holds size of Montgomery factor R2 mod N in bytes.
equalTimeRun the function time equalized or no timing equalization.
arithTypeType of arithmetic to perform (integer or F2m)
Returns
Operation status.
status_t LTC_PKHA_MontgomeryToNormal ( LTC_Type *  base,
const uint8_t *  N,
uint16_t  sizeN,
uint8_t *  A,
uint16_t *  sizeA,
uint8_t *  B,
uint16_t *  sizeB,
ltc_pkha_timing_t  equalTime,
ltc_pkha_f2m_t  arithType 
)

This function converts Montgomery format of A or B into int A or B.

Parameters
baseLTC peripheral base address
Nmodulus.
sizeNsize of N modulus in bytes.
[in,out]AInput first number in Montgomery format. Output is non-Montgomery format.
[in,out]sizeApointer to size variable. On input it holds size of the input A in bytes. On output it holds size of non-Montgomery A in bytes.
[in,out]BInput first number in Montgomery format. Output is non-Montgomery format.
[in,out]sizeBpointer to size variable. On input it holds size of the input B in bytes. On output it holds size of non-Montgomery B in bytes.
equalTimeRun the function time equalized or no timing equalization.
arithTypeType of arithmetic to perform (integer or F2m)
Returns
Operation status.
status_t LTC_PKHA_ModAdd ( LTC_Type *  base,
const uint8_t *  A,
uint16_t  sizeA,
const uint8_t *  B,
uint16_t  sizeB,
const uint8_t *  N,
uint16_t  sizeN,
uint8_t *  result,
uint16_t *  resultSize,
ltc_pkha_f2m_t  arithType 
)

This function performs modular addition of (A + B) mod N, with either integer or binary polynomial (F2m) inputs. In the F2m form, this function is equivalent to a bitwise XOR and it is functionally the same as subtraction.

Parameters
baseLTC peripheral base address
Afirst addend (integer or binary polynomial)
sizeASize of A in bytes
Bsecond addend (integer or binary polynomial)
sizeBSize of B in bytes
Nmodulus. For F2m operation this can be NULL, as N is ignored during F2m polynomial addition.
sizeNSize of N in bytes. This must be given for both integer and F2m polynomial additions.
[out]resultOutput array to store result of operation
[out]resultSizeOutput size of operation in bytes
arithTypeType of arithmetic to perform (integer or F2m)
Returns
Operation status.
status_t LTC_PKHA_ModSub1 ( LTC_Type *  base,
const uint8_t *  A,
uint16_t  sizeA,
const uint8_t *  B,
uint16_t  sizeB,
const uint8_t *  N,
uint16_t  sizeN,
uint8_t *  result,
uint16_t *  resultSize 
)

This function performs modular subtraction of (A - B) mod N with integer inputs.

Parameters
baseLTC peripheral base address
Afirst addend (integer or binary polynomial)
sizeASize of A in bytes
Bsecond addend (integer or binary polynomial)
sizeBSize of B in bytes
Nmodulus
sizeNSize of N in bytes
[out]resultOutput array to store result of operation
[out]resultSizeOutput size of operation in bytes
Returns
Operation status.
status_t LTC_PKHA_ModSub2 ( LTC_Type *  base,
const uint8_t *  A,
uint16_t  sizeA,
const uint8_t *  B,
uint16_t  sizeB,
const uint8_t *  N,
uint16_t  sizeN,
uint8_t *  result,
uint16_t *  resultSize 
)

This function performs modular subtraction of (B - A) mod N, with integer inputs.

Parameters
baseLTC peripheral base address
Afirst addend (integer or binary polynomial)
sizeASize of A in bytes
Bsecond addend (integer or binary polynomial)
sizeBSize of B in bytes
Nmodulus
sizeNSize of N in bytes
[out]resultOutput array to store result of operation
[out]resultSizeOutput size of operation in bytes
Returns
Operation status.
status_t LTC_PKHA_ModMul ( LTC_Type *  base,
const uint8_t *  A,
uint16_t  sizeA,
const uint8_t *  B,
uint16_t  sizeB,
const uint8_t *  N,
uint16_t  sizeN,
uint8_t *  result,
uint16_t *  resultSize,
ltc_pkha_f2m_t  arithType,
ltc_pkha_montgomery_form_t  montIn,
ltc_pkha_montgomery_form_t  montOut,
ltc_pkha_timing_t  equalTime 
)

This function performs modular multiplication with either integer or binary polynomial (F2m) inputs. It can optionally specify whether inputs and/or outputs will be in Montgomery form or not.

Parameters
baseLTC peripheral base address
Afirst addend (integer or binary polynomial)
sizeASize of A in bytes
Bsecond addend (integer or binary polynomial)
sizeBSize of B in bytes
Nmodulus.
sizeNSize of N in bytes
[out]resultOutput array to store result of operation
[out]resultSizeOutput size of operation in bytes
arithTypeType of arithmetic to perform (integer or F2m)
montInFormat of inputs
montOutFormat of output
equalTimeRun the function time equalized or no timing equalization. This argument is ignored for F2m modular multiplication.
Returns
Operation status.
status_t LTC_PKHA_ModExp ( LTC_Type *  base,
const uint8_t *  A,
uint16_t  sizeA,
const uint8_t *  N,
uint16_t  sizeN,
const uint8_t *  E,
uint16_t  sizeE,
uint8_t *  result,
uint16_t *  resultSize,
ltc_pkha_f2m_t  arithType,
ltc_pkha_montgomery_form_t  montIn,
ltc_pkha_timing_t  equalTime 
)

This function performs modular exponentiation with either integer or binary polynomial (F2m) inputs.

Parameters
baseLTC peripheral base address
Afirst addend (integer or binary polynomial)
sizeASize of A in bytes
Nmodulus
sizeNSize of N in bytes
Eexponent
sizeESize of E in bytes
[out]resultOutput array to store result of operation
[out]resultSizeOutput size of operation in bytes
montInFormat of A input (normal or Montgomery)
arithTypeType of arithmetic to perform (integer or F2m)
equalTimeRun the function time equalized or no timing equalization.
Returns
Operation status.
status_t LTC_PKHA_ModRed ( LTC_Type *  base,
const uint8_t *  A,
uint16_t  sizeA,
const uint8_t *  N,
uint16_t  sizeN,
uint8_t *  result,
uint16_t *  resultSize,
ltc_pkha_f2m_t  arithType 
)

This function performs modular reduction with either integer or binary polynomial (F2m) inputs.

Parameters
baseLTC peripheral base address
Afirst addend (integer or binary polynomial)
sizeASize of A in bytes
Nmodulus
sizeNSize of N in bytes
[out]resultOutput array to store result of operation
[out]resultSizeOutput size of operation in bytes
arithTypeType of arithmetic to perform (integer or F2m)
Returns
Operation status.
status_t LTC_PKHA_ModInv ( LTC_Type *  base,
const uint8_t *  A,
uint16_t  sizeA,
const uint8_t *  N,
uint16_t  sizeN,
uint8_t *  result,
uint16_t *  resultSize,
ltc_pkha_f2m_t  arithType 
)

This function performs modular inversion with either integer or binary polynomial (F2m) inputs.

Parameters
baseLTC peripheral base address
Afirst addend (integer or binary polynomial)
sizeASize of A in bytes
Nmodulus
sizeNSize of N in bytes
[out]resultOutput array to store result of operation
[out]resultSizeOutput size of operation in bytes
arithTypeType of arithmetic to perform (integer or F2m)
Returns
Operation status.
status_t LTC_PKHA_ModR2 ( LTC_Type *  base,
const uint8_t *  N,
uint16_t  sizeN,
uint8_t *  result,
uint16_t *  resultSize,
ltc_pkha_f2m_t  arithType 
)

This function computes a constant to assist in converting operands into the Montgomery residue system representation.

Parameters
baseLTC peripheral base address
Nmodulus
sizeNSize of N in bytes
[out]resultOutput array to store result of operation
[out]resultSizeOutput size of operation in bytes
arithTypeType of arithmetic to perform (integer or F2m)
Returns
Operation status.
status_t LTC_PKHA_GCD ( LTC_Type *  base,
const uint8_t *  A,
uint16_t  sizeA,
const uint8_t *  N,
uint16_t  sizeN,
uint8_t *  result,
uint16_t *  resultSize,
ltc_pkha_f2m_t  arithType 
)

This function calculates the greatest common divisor of two inputs with either integer or binary polynomial (F2m) inputs.

Parameters
baseLTC peripheral base address
Afirst value (must be smaller than or equal to N)
sizeASize of A in bytes
Nsecond value (must be non-zero)
sizeNSize of N in bytes
[out]resultOutput array to store result of operation
[out]resultSizeOutput size of operation in bytes
arithTypeType of arithmetic to perform (integer or F2m)
Returns
Operation status.
status_t LTC_PKHA_PrimalityTest ( LTC_Type *  base,
const uint8_t *  A,
uint16_t  sizeA,
const uint8_t *  B,
uint16_t  sizeB,
const uint8_t *  N,
uint16_t  sizeN,
bool *  res 
)

This function calculates whether or not a candidate prime number is likely to be a prime.

Parameters
baseLTC peripheral base address
Ainitial random seed
sizeASize of A in bytes
Bnumber of trial runs
sizeBSize of B in bytes
Ncandidate prime integer
sizeNSize of N in bytes
[out]resTrue if the value is likely prime or false otherwise
Returns
Operation status.
status_t LTC_PKHA_ECC_PointAdd ( LTC_Type *  base,
const ltc_pkha_ecc_point_t A,
const ltc_pkha_ecc_point_t B,
const uint8_t *  N,
const uint8_t *  R2modN,
const uint8_t *  aCurveParam,
const uint8_t *  bCurveParam,
uint8_t  size,
ltc_pkha_f2m_t  arithType,
ltc_pkha_ecc_point_t result 
)

This function performs ECC point addition over a prime field (Fp) or binary field (F2m) using affine coordinates.

Parameters
baseLTC peripheral base address
ALeft-hand point
BRight-hand point
NPrime modulus of the field
R2modNNULL (the function computes R2modN internally) or pointer to pre-computed R2modN (obtained from LTC_PKHA_ModR2() function).
aCurveParamA parameter from curve equation
bCurveParamB parameter from curve equation (constant)
sizeSize in bytes of curve points and parameters
arithTypeType of arithmetic to perform (integer or F2m)
[out]resultResult point
Returns
Operation status.
status_t LTC_PKHA_ECC_PointDouble ( LTC_Type *  base,
const ltc_pkha_ecc_point_t B,
const uint8_t *  N,
const uint8_t *  aCurveParam,
const uint8_t *  bCurveParam,
uint8_t  size,
ltc_pkha_f2m_t  arithType,
ltc_pkha_ecc_point_t result 
)

This function performs ECC point doubling over a prime field (Fp) or binary field (F2m) using affine coordinates.

Parameters
baseLTC peripheral base address
BPoint to double
NPrime modulus of the field
aCurveParamA parameter from curve equation
bCurveParamB parameter from curve equation (constant)
sizeSize in bytes of curve points and parameters
arithTypeType of arithmetic to perform (integer or F2m)
[out]resultResult point
Returns
Operation status.
status_t LTC_PKHA_ECC_PointMul ( LTC_Type *  base,
const ltc_pkha_ecc_point_t A,
const uint8_t *  E,
uint8_t  sizeE,
const uint8_t *  N,
const uint8_t *  R2modN,
const uint8_t *  aCurveParam,
const uint8_t *  bCurveParam,
uint8_t  size,
ltc_pkha_timing_t  equalTime,
ltc_pkha_f2m_t  arithType,
ltc_pkha_ecc_point_t result,
bool *  infinity 
)

This function performs ECC point multiplication to multiply an ECC point by a scalar integer multiplier over a prime field (Fp) or a binary field (F2m).

Parameters
baseLTC peripheral base address
APoint as multiplicand
EScalar multiple
sizeEThe size of E, in bytes
NModulus, a prime number for the Fp field or Irreducible polynomial for F2m field.
R2modNNULL (the function computes R2modN internally) or pointer to pre-computed R2modN (obtained from LTC_PKHA_ModR2() function).
aCurveParamA parameter from curve equation
bCurveParamB parameter from curve equation (C parameter for operation over F2m).
sizeSize in bytes of curve points and parameters
equalTimeRun the function time equalized or no timing equalization.
arithTypeType of arithmetic to perform (integer or F2m)
[out]resultResult point
[out]infinityOutput true if the result is point of infinity, and false otherwise. Writing of this output will be ignored if the argument is NULL.
Returns
Operation status.