TBBR: Reduce size of hash buffers when possible
The TBBR implementation extracts hashes from certificates and stores
them in static buffers. TF-A supports 3 variants of SHA right now:
SHA-256, SHA-384 and SHA-512. When support for SHA-512 was added in
commit 9a3088a5f5
("tbbr: Add build flag
HASH_ALG to let the user to select the SHA"), the hash buffers got
unconditionally increased from 51 to 83 bytes each. We can reduce that
space if we're using SHA-256 or SHA-384.
This saves some BSS space in both BL1 and BL2:
- BL1 with SHA-256: saving 168 bytes.
- BL1 with SHA-384: saving 80 bytes.
- BL2 with SHA-256: saving 384 bytes.
- BL2 with SHA-384: saving 192 bytes.
Change-Id: I0d02e5dc5f0162e82339c768609c9766cfe7e2bd
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
This commit is contained in:
parent
495599cd0a
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0b4e59211b
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@ -41,7 +41,15 @@
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#define PK_DER_LEN 91
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#endif
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#if TF_MBEDTLS_HASH_ALG_ID == TF_MBEDTLS_SHA256
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#define HASH_DER_LEN 51
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#elif TF_MBEDTLS_HASH_ALG_ID == TF_MBEDTLS_SHA384
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#define HASH_DER_LEN 67
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#elif TF_MBEDTLS_HASH_ALG_ID == TF_MBEDTLS_SHA512
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#define HASH_DER_LEN 83
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#else
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#error "Invalid value for TF_MBEDTLS_HASH_ALG_ID"
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#endif
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/*
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* The platform must allocate buffers to store the authentication parameters
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