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Add macros to ASN.1 module to parse ASN.1 tags
The macros simply extract the component bits of an ASN.1 tag value
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@ -87,6 +87,22 @@
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#define MBEDTLS_ASN1_PRIMITIVE 0x00
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#define MBEDTLS_ASN1_CONSTRUCTED 0x20
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#define MBEDTLS_ASN1_CONTEXT_SPECIFIC 0x80
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/*
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* Bit masks for each of the components of an ASN.1 tag as specified in
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* Information technnology - ASN.1 encoding rules: Specification of Basic
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* Encoding Rules (BER), Canonical Encoding Rules (CER), and Distinguished
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* encoding rules (DER) Section 8.1.2.2:
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*
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* Bit 8 7 6 5 1
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* +-------+-----+------------+
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* | Class | P/C | Tag number |
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* +-------+-----+------------+
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*/
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#define MBEDTLS_ASN1_TAG_CLASS_MASK ( 0x03 << 6 )
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#define MBEDTLS_ASN1_TAG_PC_MASK ( 0x01 << 5 )
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#define MBEDTLS_ASN1_TAG_VALUE_MASK ( 0x1F << 0 )
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/* \} name */
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/* \} addtogroup asn1_module */
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