ECC LibraryComponents > Security > ECDSA

Description

Elliptic Curve Cryptography Library.

The Elliptic Curve Cryptography (ECC) API includes ECDSA verification on one of the elliptic curves recommended by NIST in csrc.nist.gov/groups/ST/toolkit/documents/dss/NISTReCur.pdf :

  • secp256r1: NIST/SECG X9.62 curve over a 256 bit prime field

Data Structures

struct ECC_Point_t
struct ECC_EcdsaSignature_t

Macros

#define ECC_BIGINT_SIZE_IN_BITS (256)
#define ECC_BIGINT_SIZE_IN_BYTES ( ECC_BIGINT_SIZE_IN_BITS / 8)
#define ECC_BIGINT_SIZE_IN_32BIT_WORDS

Typedefs

typedef uint32_t ECC_BigInt_t [ ECC_BIGINT_SIZE_IN_32BIT_WORDS ]

Functions

int32_t ECC_ECDSA_VerifySignatureP256 (CRYPTO_TypeDef *crypto, const uint8_t *msgDigest, int msgDigestLen, const ECC_Point_t *publicKey, ECC_EcdsaSignature_t *signature)
Verify an ECDSA signature.
void ECC_HexToBigInt ( ECC_BigInt_t bigint, const char *hex)
Convert a large integer from a hexadecimal string to the ECC_BigInt_t format.
void ECC_BigIntToHex (char *hex, ECC_BigInt_t bigint)
Convert a large integer from the ECC_BigInt_t to a hexadecimal string format.
void ECC_ByteArrayToBigInt ( ECC_BigInt_t bigint, const uint8_t *bytearray)
Convert a big integer from a byte array to the ECC_BigInt_t format.
void ECC_BigIntToByteArray (uint8_t *bytearray, ECC_BigInt_t bigint)
Convert a large integer from the ECC_BigInt_t to the byte array format.
void ECC_UnsignedIntToBigInt ( ECC_BigInt_t bigint, const uint32_t value)
Convert an integer from uint32_t to ECC_BigInt_t format.

Macro Definition Documentation

#define ECC_BIGINT_SIZE_IN_BITS   (256)

ECC big integer size in bits.

Definition at line 49 of file ecc.h .

#define ECC_BIGINT_SIZE_IN_BYTES   ( ECC_BIGINT_SIZE_IN_BITS / 8)

ECC big integer size in bytes.

Definition at line 52 of file ecc.h .

#define ECC_BIGINT_SIZE_IN_32BIT_WORDS
Value:
( ECC_BIGINT_SIZE_IN_BYTES \
/ sizeof (uint32_t))
ECC_BIGINT_SIZE_IN_BYTES
#define ECC_BIGINT_SIZE_IN_BYTES
Definition: ecc.h:52

ECC big integer size in words.

Definition at line 55 of file ecc.h .

Typedef Documentation

typedef uint32_t ECC_BigInt_t[ ECC_BIGINT_SIZE_IN_32BIT_WORDS ]

ECC big integer type

Definition at line 59 of file ecc.h .

Function Documentation

int32_t ECC_ECDSA_VerifySignatureP256 ( CRYPTO_TypeDef * crypto,
const uint8_t * msgDigest,
int msgDigestLen,
const ECC_Point_t * publicKey,
ECC_EcdsaSignature_t * signature
)

Verify an ECDSA signature.

TBW

Parameters
[in] crypto Pointer to CRYPTO peripheral instance
[in] msgDigest The message digest associated with the signature.
[in] msgDigestLen The length of the message digest.
[in] publicKey Public key of entity that generated signature.
[out] signature The signature to verify.
Returns
Error code.
void ECC_HexToBigInt ( ECC_BigInt_t bigint,
const char * hex
)

Convert a large integer from a hexadecimal string to the ECC_BigInt_t format.

Convert a large integer from a hexadecimal string representation to a ECC_BigInt_t representation.

Parameters
[out] bigint Pointer to the location where to store the result.
[in] hex The hex representation of the large integer to convert.
void ECC_BigIntToHex ( char * hex,
ECC_BigInt_t bigint
)

Convert a large integer from the ECC_BigInt_t to a hexadecimal string format.

Convert a large integer from a ECC_BigInt_t representation to a hexadecimal string representation.

Parameters
[out] hex Buffer where to store the hexadecimal result.
[in] bigint The ECC_BigInt_t representation of the large integer to convert.
void ECC_ByteArrayToBigInt ( ECC_BigInt_t bigint,
const uint8_t * bytearray
)

Convert a big integer from a byte array to the ECC_BigInt_t format.

Convert a large integer from a byte array representation to a ECC_BigInt_t representation.

Parameters
[out] bigint Pointer to the location where to store the result.
[in] bytearray The byte array representation of the large integer to convert.
void ECC_BigIntToByteArray ( uint8_t * bytearray,
ECC_BigInt_t bigint
)

Convert a large integer from the ECC_BigInt_t to the byte array format.

Convert a large integer from a ECC_BigInt_t representation to a byte array representation. Caution: byte array must be big enough to contain the result.

Parameters
[out] bytearray Buffer to store the resulting byte array.
[in] bigint The ECC_BigInt_t representation of the large integer to convert.
void ECC_UnsignedIntToBigInt ( ECC_BigInt_t bigint,
const uint32_t value
)

Convert an integer from uint32_t to ECC_BigInt_t format.

Convert a integer from an uint32_t representation to a ECC_BigInt_t representation.

Parameters
[out] bigint Pointer to the location to store the result.
[in] value The value to convert.