mbedtls_ecdsa_raw_to_der() function

Convert an ECDSA signature from raw format to DER ASN.1 format.

Syntax

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Summary

Declaration

Definition

from psa_util.h:165

int mbedtls_ecdsa_raw_to_der(size_t bits, const unsigned char *raw, size_t raw_len, unsigned char *der, size_t der_size, size_t *der_len);

Implemented in psa_util.c:433

Arguments

Argument

Declared as

Description

bits

size_t

Size of each coordinate in bits.

raw

const unsigned char *

Buffer that contains the signature in raw format.

raw_len

size_t

Length of \p raw in bytes. This must be PSA_BITS_TO_BYTES(bits) bytes.

der

unsigned char *

Buffer that will be filled with the converted DER output. It can overlap with raw buffer.

der_size

size_t

Size of \p der in bytes. It is enough if \p der_size is at least the size of the actual output. (The size of the output can vary depending on the presence of leading zeros in the data.) You can use #MBEDTLS_ECDSA_MAX_SIG_LEN(\p bits) to determine a size that is large enough for all signatures for a given value of \p bits.

der_len

size_t *

On success it contains the amount of valid data (in bytes) written to \p der. It's undefined in case of failure.