mbedtls_cipher_write_tag() - syntax, references, call tree, description

This function writes a tag for AEAD ciphers. Currently supported with GCM and ChaCha20+Poly1305. This must be called after mbedtls_cipher_finish().

Syntax

from cipher.h:729

int mbedtls_cipher_write_tag( mbedtls_cipher_context_t *ctx, unsigned char *tag, size_t tag_len );

Implemented in cipher.c:903

Arguments

ctx

The generic cipher context. This must be initialized, bound to a key, and have just completed a cipher operation through mbedtls_cipher_finish() the tag for which should be written.

tag

The buffer to write the tag to. This must be a writable buffer of at least \p tag_len Bytes.

tag_len

The length of the tag to write.

Return value

References

Location	Text
cipher.c:903	int mbedtls_cipher_write_tag( mbedtls_cipher_context_t *ctx,
cipher.h:729	int mbedtls_cipher_write_tag( mbedtls_cipher_context_t *ctx,

Call Tree

Functions called by mbedtls_cipher_write_tag()

mbedtls_cipher_write_tag()

mbedtls_gcm_finish()

all items filtered out

Data read by mbedtls_cipher_write_tag()

mbedtls_cipher_mode_t::MBEDTLS_MODE_GCM

mbedtls_operation_t::MBEDTLS_ENCRYPT

mbedtls_cipher_info_t::mode

mbedtls_cipher_context_t::cipher_info

mbedtls_cipher_context_t::operation

mbedtls_cipher_context_t::cipher_ctx

mbedtls_cipher_write_tag()::ctx

mbedtls_cipher_write_tag()::tag

mbedtls_cipher_write_tag()::tag_len