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Reduce code-size of mbedtls_asn1_get_alg()
The previous code - checked that at least 1 byte of ASN.1 tag data is available, - read and stored that ASN.1 tag, - called the ASN.1 parsing function, part of which is checking that enough space is available and that the ASN.1 tag matches the expected value MBEDTLS_ASN1_OID. Since the ASN.1 parsing function includes bounds checks, this can be streamlined to: - call the ASN.1 parsing function directly, - on success, store MBEDTLS_ASN1_OID in the tag field. This commit applies this simplification to mbedtls_asn1_get_alg().
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@ -295,15 +295,12 @@ int mbedtls_asn1_get_alg( unsigned char **p,
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MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
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return( ret );
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if( ( end - *p ) < 1 )
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return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
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alg->tag = **p;
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end = *p + len;
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if( ( ret = mbedtls_asn1_get_tag( p, end, &alg->len, MBEDTLS_ASN1_OID ) ) != 0 )
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return( ret );
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alg->tag = MBEDTLS_ASN1_OID;
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alg->p = *p;
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*p += alg->len;
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