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SourceVuESP-IDF Framework and ExamplesmbedTLSmbedtls_asn1_get_mpi()

mbedtls_asn1_get_mpi() function

Retrieve an integer ASN.1 tag and its value. Updates the pointer to immediately behind the full tag.

Syntax

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Summary

Declaration

Definition

from asn1.h:541

int mbedtls_asn1_get_mpi(unsigned char **p, const unsigned char *end, mbedtls_mpi *X);

Implemented in asn1parse.c:163

Arguments

Argument

Description

p

On entry, \c *p points to the start of the ASN.1 element. On successful completion, \c *p points to the first byte beyond the ASN.1 element. On error, the value of \c *p is undefined.

end

End of data.

X

On success, the parsed value.

Return value

0 if successful. An ASN.1 error code if the input does not start with a valid ASN.1 INTEGER. #MBEDTLS_ERR_ASN1_INVALID_LENGTH if the parsed value does not fit in an \c int. An MPI error code if the parsed value is too large.

References

Code

Location

Referrer

int mbedtls_asn1_get_mpi(unsigned char **p,

asn1parse.c:163

int mbedtls_asn1_get_mpi(unsigned char **p,

if ((ret = mbedtls_asn1_get_mpi(&p, end, &dhm->P)) != 0 ||

mbedtls_dhm_parse_dhm()

(ret = mbedtls_asn1_get_mpi(&p, end, &dhm->G)) != 0) {

mbedtls_dhm_parse_dhm()

ret = mbedtls_asn1_get_mpi(&p, end, &rec);

mbedtls_dhm_parse_dhm()

if ((ret = mbedtls_asn1_get_mpi(&p, end, &r)) != 0 ||

mbedtls_ecdsa_read_signature_restartable()

(ret = mbedtls_asn1_get_mpi(&p, end, &s)) != 0) {

mbedtls_ecdsa_read_signature_restartable()

if ((ret = mbedtls_asn1_get_mpi(&p, end_field, &grp->P)) != 0) {

pk_group_from_specified()

if ((ret = mbedtls_asn1_get_mpi(&p, end, &grp->N)) != 0) {

pk_group_from_specified()

ret = mbedtls_asn1_get_mpi(p, end, X);

asn1_get_nonzero_mpi()

Call Tree

mbedtls_asn1_get_mpi() is called by 4 functions and calls 2 functions:

mbedtls_dhm_parse_dhm()

mbedtls_ecdsa_read_signature_restartable()

pk_group_from_specified()

asn1_get_nonzero_mpi()

mbedtls_asn1_get_mpi()

mbedtls_mpi_read_binary()

mbedtls_asn1_get_tag()

Data Use

mbedtls_asn1_get_mpi():

mbedtls_asn1_get_mpi()

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