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mbedtls_ctr_drbg_seed() always set the entropy length to the default, so a call to mbedtls_ctr_drbg_set_entropy_len() before seed() had no effect. Change this to the more intuitive behavior that set_entropy_len() sets the entropy length and seed() respects that and only uses the default entropy length if there was no call to set_entropy_len(). This removes the need for the test-only function mbedtls_ctr_drbg_seed_entropy_len(). Just call mbedtls_ctr_drbg_set_entropy_len() followed by mbedtls_ctr_drbg_seed(), it works now.